Honeywell perfect climate comfort center control system Thermostat User Manual

Perfect Climate Comfort Center™

Control System

PRODUCT DATA

FEATURES

The PC8900A mounts in the living space and accurately

measures and controls room temperature and humidity.

•

Only four wires required for installation.

Large, continuously lit LCD.

Seven-day (auto copy) programming.

Simultaneous display of heat and cool setpoints.

Keyboard lockout protection available.

No batteries required, indefinite program retention.

Circulation fan setting improves indoor air quality.

Field configurable for:

PC8900A

—

Automatic or manual changeover.

°F or °C display.

12- or 24-hour clock.

Adaptive Intelligent Recovery™ control or conven-

tional recovery.

—

Humidity control in heating or cooling.

Outdoor, remote, and discharge temperature sen-

sors available.

—

Fan overrun in cooling.

Ventilation control.

The W8900A-C mounts near the equipment. The

PC8900A, heating, cooling, ventilation and

dehumidification equipment and all additional sensors

are wired to the W8900A-C.

W8900A-C

•

Compatible with most 24 Vac Systems.

Remote sensor, discharge sensor, outdoor sensor and

GENERAL

CO monitor available.

This document contains information on the Perfect Climate

Comfort Center™ Control System including components and

accessories. Some components and accessories include the

PC8900A Control Panel, W8900A-C Remote Module,

C7189A Remote Indoor Sensor, C7089A Outdoor Sensor,

C7100A Discharge Air Sensor, CO2 Monitor, CM8900A

Communication Module, and W8735B Telephone Access

Module.

•

Optional remote communications available.

Contents

General .............................................................................

Features ...........................................................................

Specifications ....................................................................

Ordering Information ........................................................

Installation ........................................................................

Wiring Diagrams ...............................................................

W8900A,C Hookup Diagrams .......................................

W8900B Hookup Diagrams ........................................... 14

W8900A,B,C Humidity Control Hookup Diagrams ........ 18

Installer Setup ................................................................... 24

Programming PC8900A .................................................... 27

Checkout .......................................................................... 33

Operation .......................................................................... 34

Troubleshooting ................................................................ 40

Glossary ........................................................................... 44

The Comfort Center control system provides 24 Vac energy

saving control for a heating and cooling system, while

providing reliable and precise temperature, ventilation and

humidity control.

U.S. Registered Trademark

68- 0173- 3

SPECIFICATIONS

IMPORTANT

C7100A: See Fig. 4.

C7189A: See Fig. 5.

PC8900A: See Fig. 6.

W8900A-C: See Fig. 7.

The specifications given in this publication do not

include normal manufacturing tolerances; therefore,

an individual unit might not exactly match the listed

specifications. Also, this product is tested and cali-

brated under closely controlled conditions, and some

minor differences in performance can be expected if

those conditions are changed.

Operating Ambient Temperature Range:

NOTES: System is capable of turning on heat at 0°F (-18°C).

C7089A: -40° to 128°F (-40° to 53°C).

C7100A: 40° to 150°F (4° to 66°C).

Models:

C7189A: 40° to 95°F (4° to 35°C).

PC8900A: 40° to 110°F (4° to 43°C).

W8900A-C: -40° to 150°F (-40° to 66°C).

The PC8900A Comfort Center™ Control Panel mounts in the

living space and accurately measures and controls room

temperature and humidity. The W8900A-C Remote Module

provides a wiring panel and switching for the Perfect Climate

Comfort Center™ Control System. See Table 1.

Shipping Temperature Range (All Components): -20° to

150°F (-29° to 66°C).

System Components and Accessories (See Fig. 1):

C7089A1002 Outdoor Sensor: Used to measure outdoor tem-

perature.

Operating Relative Humidity Range (All Components):

5 percent RH to 90 percent RH, noncondensing.

C7100A1015 Discharge Air Sensor: Used to sense tempera-

ture in discharge or return air.

C7189A1001 Remote Indoor Sensor: Used for remote sensor

applications.

Mounting Means:

C7089A Outdoor Sensor: Mounts outside of living space using

locally obtained mounting hardware.

C7100A Discharge Air Sensor: Mounts in discharge air duct,

near air exchanger in a 2 x 4 in. outlet box or on a flat duct

or plenum surface. The temperature sensor probe passes

through a 7/8 in. knockout in the 2 x 4 in. outlet box.

C7189A Remote Indoor Sensor: Mounts directly on the wall

using mounting screws and anchors provided.

PC8900A Control Panel:

CM8900A1009 Communication Module: Used for remote

communication.

W8735B1003 Telephone Access Module: Used for remote

communication.

02689A Mounting Plate Accessory: Used when C7189A

Remote Indoor Sensor cannot cover wall marks from old

thermostat.

Without Remote Sensor: Mounts directly on the wall in liv-

ing space using mounting screws and anchors provided.

With Remote Sensor: Mounts directly on the wall in a

closet or other convenient location using mounting

screws and anchors provided.

05224A Wall Cover Plate: Used when PC8900A Control

Panel cannot cover wall marks from old thermostat.

2007496-001 Replacement Door: Used for PC8900A Control

Panel.

Dimensions:

W8900A-C Remote Module: Mounts directly on the wall, near

HVAC equipment or cold air return, using mounting screws

and anchors provided.

205224A: See Fig. 2.

C7089A: See Fig. 3.

Table 1. W8900A-C Models.

Use with

Heat

Stages

Cool

Stages

Vent

Humidity

Model

W8900A

W8900B

W8900C

System Type

Conventional

Heat pump

Adjustment Adjustment Heat Adjustment Cool

Use with

PC8900A

2^a

yes

yes^b

PC8900A

Conventional

Models with O and B terminals have single stage cooling.

Uses reheat. See Operation section.

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the

TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or

phone:

Your local Home and Building Control Sales Office (check white pages of your phone directory).

Home and Building Control Customer Relations

Honeywell, 1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386 (800) 328-5111

In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.

International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,

Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

68-0173—3

Finish:

Heat Pump Failure Input (L Terminal on W8900B Models):

24 Vac load, 50/60 Hz, 0.3 VA load.

C7189A Wall Mount Remote Indoor Sensor: Premier White®

color.

CO Monitor Input (CO Terminal on all W8900A-C Mod-

PC8900A Control Panel: Premier White® color.

els): 24 Vac load, 50/60 Hz, 0.3 VA load.

W8900A-C Remote Module: Charcoal gray color.

Output Ratings:

Humidity Control Output Relay: 50 VA at 24 Vac.

Ventilation, W1, W2, Y1, Y2, E, G, O, B, AUX, Y1/W1:

a. 1.5A running, 3.5A inrush at 200,000 cycles

(30 Vac).

Clock Accuracy: ± 1 minute per month.

Approvals:

FCC Class B: Pending.

NEMA DC-3: Not required.

b. 1.5A running, 7.5A inrush at 100,000 cycles

(

30 Vac).

Batteries: No batteries required. During power outages, time

is retained for six hours. All programmed setpoints and

times are retained indefinitely.

Run: 40% power factor minimum.

Inrush: 50% power factor minimum.

Temperature Setting Range: PC8900A: 45° to 88°F

Resistance Characteristics of Sensors:

(7° to 31°C).

C7089A Outdoor Sensor: PTC Sensor. See Fig. 39 in the

Operation section for sensor resistance characteristics.

C7100A Discharge Air Sensor: See Fig. 39 in the Operation

section for sensor resistance characteristics.

C7189A Remote Indoor Sensor: NTC Sensor. See Fig. 40 in

the Operation section for sensor resistance characteristics.

Humidity Setting Range:

PC8900A: 10 to 80% RH.

Cooling: 40 to 80% RH.

Heating: 10 to 80% RH.

Calibration: C7089A, C7100A, C7189A, and PC8900A are

Auxiliary Heat and Emergency Heat Indication: PC8900A

display indicates when auxiliary heat and emergency heat

are activated.

factory calibrated and require no field calibration.

CO Monitors: The W8900A-C allows for connection of a

CO Monitor with uncommitted contacts.

Input Ratings:

20 to 30 Vac, 50/60 Hz.

C7089A

Outdoor Sensor

PC8900A

Comfort Center™

Control Panel

W8735B

Telephone Access

Module

W8900A-C

Remote Module

C7189A

CM8900A

C7100A

Remote Indoor Sensor

Communication Module

Discharge Air Sensor

Fig. 1. System components and accessories.

68-0173—3

-1/2 (38)

(

152)

22)

(

22)

(

M4488

-1/4 (83)

-1/2 (216)

Fig. 3. Dimensions for C7089A Outdoor Sensor

Mounting Clip in in. (mm).

M7513

Fig. 2. Dimensions for 205224A Wall Cover

Plate in in. (mm).

(

-3/16 1-13/16

30)

(46)

1-3/16

(30)

(

19)

13-1/4 (336)

M4461

-13/16

46)

(

Fig. 4. Dimensions for C7100A Discharge Air Sensor in in. (mm).

(

-5/8

117)

4-5/8

(117)

(

-1/4

83)

(

-1/8

29)

-3/4 (70)

2-3/4 (70)

M4465

FRONT VIEW

SIDE VIEW

FRONT VIEW (COVER OFF)

Fig. 5. Dimensions for C7189A Remote Indoor Sensor in in. (mm).

68-0173—3

(152)

1-5/8 (41)

-1/4 (83)

(102)

(

-3/8

86)

22)

(

22)

(

-3/8 (162)

SYSTEM

CHECK

102)

(

SET

CLOCK

SYSTEM

HEAT OFF COOL

FAN

AUTO ON CIRC

HEAT/COOL

SETPOINTS

DAY

SELECT

PERIOD

HUMIDITY

VENTILATE

HOLD

RUN

NOTE:

PC8900 SHOWN WITH

COVER REMOVED.

TIME

CANCEL

M6356

Fig. 6. Dimensions for PC8900A Control Panel in in. (mm).

MERCURY NOTICE

If this control is replacing a control that contains

mercury in a sealed tube, do not place your old control

in the trash.

(

-13/16

197)

Contact your local waste management authority for

instructions regarding recycling and the proper

disposal of this control or of an old control containing

mercury in a sealed tube.

(

-3/4

222)

If you have questions, call Honeywell Inc. at

-800-468-1502, Monday through Friday, 7:00 a.m. to

:30 p.m., Central time.

/2 (12)

INSTALLATION

(

19)

-7/8 (124)

-3/8 (163)

(

4) 3/8 (5)

When Installing this Product…

Read these instructions carefully. Failure to follow

instructions can damage the product or cause a

hazardous condition.

51)

(

Check the ratings on the product to make sure the

product is suitable for your application.

Installer must be a trained, experienced service

technician.

After completing installation, use these instructions to

check out product operation.

NOTE: W8900 SHOWN WITH COVER REMOVED.

M6355

Fig. 7. Dimensions for W8900A-C Remote

Module in in. (mm).

68-0173—3

CAUTION

Disconnect power supply before wiring to prevent

electrical shock or equipment damage.

W8900

WALL

Mounting the W8900A-C Remote Module

Locate the W8900A-C in the equipment room near the HVAC

equipment. See Fig. 8.

MOUNTING

HOLES (4)

CAUTION

Do not mount the W8900A-C inside any HVAC

equipment. Mounting the W8900A-C inside HVAC

equipment can cause damage to the W8900A-C.

Grasp the top edge of the W8900A-C cover, either at

thecenterorbothcorners,andpullitofffrom the base.

Locate the four mounting holes. See Fig. 9.

Position the W8900A-C on wall or cold air return. Level

the W8900A-C for appearance only; the device will

function properly even when not level. Use a pencil to

mark the mounting holes on the wall.

MOUNTING

SCREWS (4)

M4463

W8900

Fig. 9. Mounting W8900A-C Remote Module.

Wiring the W8900A-C to the HVAC Equipment

CAUTION

Disconnect power supply before connecting

wiring to prevent electrical shock or equipment

damage.

FURNACE OR BOILER

WATER HEATER

M4459

Fig. 8. W8900A-C location example.

Wiring must comply with applicable codes, ordinances, and

regulations.

Remove the W8900A-C from the wall, and drill 3/16 in.

holes in the wall (if drywall) as marked. For firmer mate-

rial such as plaster or wood, drill 7/32 in. holes. Gently

tap anchors (provided) into drilled holes until flush with

the wall.

Reposition the W8900A-C over the holes. Loosely insert

the four mounting screws (included) into the holes.

IN REPLACEMENT INSTALLATION:

1. Locate the terminal wiring strip on the old thermostat.

2. Note the wire color for each wiring terminal used.

3. Remove the wires connected to the old thermostat and

other controls. Tape off unused wires.

4. Use Table 2 or 3 to identify the W8900A-C terminal

labels. Connect the same loads that were connected to

the old thermostat to the W8900A-C Remote Module

with a new bundle of 18-gauge color-coded thermostat

wire; see Fig. 10. See Fig. 11 through 20 for wiring dia-

grams for specific equipment applications.

68-0173—3

IMPORTANT

Be sure to connect the C terminal to transformer

W8900

common.

IN NEW INSTALLATION:

Locate the terminal strip(s) on the HVAC equipment.

Refer to Fig. 11 through 20 for wiring diagrams for spe-

cific equipment applications.

FOR STRAIGHT

CONNECTION—

STRIP 5/16 IN. (8 MM)

Connect all loads to the appropriate W8900A-C wiring

terminal using 18-gauge, color-coded thermostat wire;

see Fig. 10.

Use a small screwdriver to connect the loads. Do not

overtighten; device can be damaged.

FOR WRAPAROUND

CONNECTION—

STRIP 7/16 IN. (11 MM)

M4464

Fig. 10. Proper wiring technique for

W8900A-C and PC8900A.

Table 2. Conventional Applications (W8900A or C).

Function

PC8900A Control Panel

W8900A, C Terminal Designation

Existing Thermostat Designation

—

PC8900A Control Panel

Heating, changeover valve

24 Vac Transformer Common

Carbon Dioxide Monitor

CO₂

—

VNT

VNT Relay

—

Fan Relay

GND

HUM

OUT

Ground

—

Humidity Relay

Outdoor Air Temperature Sensor

Cooling, Changeover Valve

24 Vac System Transformer

24 Vac Cooling Transformer

24 Vac Heating Transformer

Remote Air Temperature Sensor

Fan Control—Evaporative Cooling

Heat Pump Contactor

—

S, S1

See note a

See note b

T, T1

Discharge Air Temperature Sensor

Heating Relay

—

Stage 1 Heat Relay

Stage 2 Heat Relay

Cooling Relay

Stage 1 Cool Relay

Stage 2 Cool Relay

See note c

See note d

none

Fan Control (Honeywell dual fuel thermostat [T834])

Filter Light

Remote Timer Contacts

PC8900A/W8900A,C are not compatible with evaporative cooling equipment.

In single stage heat pump applications, jumper W1 and Y1 and connect to Y. Configure the system for Auto Fan in Heat.

Dual fuel fan feature configured in installer setup.

Filter light feature available in PC8900A fan accumulation timer feature.

68-0173—3

Table 3. Heat Pump Applications (W8900B).

Existing Thermostat

Designations

(Customer Specials)

W8900B Terminal

Designations

(Standard)

Function

PC8900A Control Panel

—

PC8900A Control Panel

Stage-3 heat control (strip heat)

Heating, changeover valve

24 Vac transformer common

Carbon dioxide monitor

—

AUX^a

—

X,B

—

CO₂

—

VNT

Emergency heat relay

VNT relay

—

Fan relay

GND

Ground

—

System monitor

Cooling, changeover valve

24 Vac system transformer

Remote Air Temperature Sensor

Discharge Air Temperature Sensor

Stage-2 heat control (compressor)

Compressor contactor

Stage-1 cool control

S, S1

T, T1

W2^b

Y1/W1^c

—

H2,Y,R4

C1,M

Stage-1 heat control

H1,R3

Stage-2 cool control

None

Out^d

Clogged filter switch or common connection

Defrost

X1,X2,C

—

HSII Control Panel

L,C,H

LEDs

A,A1,A2,Z,C,L

LO and HI speed fan relays

Momentary circuit, changeover

Outdoor thermistor

R1,R2

External temperature readout, T relay

—

AUX controls the auxiliary heat like W2, and allows additional stages of auxiliary heat with outdoor thermostats while maintain-

ing the proper second stage anticipation.

For systems without 2nd stage heat, configure W2 to No.

For systems requiring separate W1 and Y1 terminals for proper heat pump operation, refer to Fig. 18 and 19.

Replace existing sensor with C7089A Outdoor Sensor.

68-0173—3

WIRING DIAGRAMS

W8900A,C Hookup Diagrams

C7189A REMOTE AIR

TEMPERATURE SENSOR

W8900A,C

^C^O2 MONITOR

C7100 DISCHARGE AIR

TEMPERATURE SENSOR

^C^O2

PC8900

C7089A OUTDOOR AIR

TEMPERATURE SENSOR

OUT

FAN RELAY

LED

GND

STAGE 2

COOL RELAY

HUM

VNT

(

HOT)

STAGE 1

COOL RELAY

HEATING

TRANSFORMER

STAGE 1

HEAT RELAY

HUMIDIFIER

OR DEHUMIDIFIER

EQUIPMENT

STAGE 2

HEAT RELAY

VENTILATION

EQUIPMENT

(

HOT)

COOLING

TRANSFORMER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH FOR SINGLE HEAT TRANSFORMER APPLICATIONS.

CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER) DURING INSTALLER SETUP .

(

W8900 ALLOWS CONNECTION OF A CO₂MONITOR WITH UNCOMMITTED CONTACTS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

M4479D

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

Fig. 11. Hookup diagram for heating/cooling system in conventional system with multiple transformers.

68-0173—3

W8900A,C

C7189A REMOTE AIR

CO₂MONITOR

TEMPERATURE SENSOR

C7100 DISCHARGE AIR

TEMPERATURE SENSOR

^C^O2

PC8900

C7089A OUTDOOR AIR

TEMPERATURE SENSOR

OUT

FAN RELAY

LED

GND

STAGE 2

COOL RELAY

HUM

VNT

STAGE 1

COOL RELAY

HOT)

(

SYSTEM

STAGE 1

TRANSFORMER

HEAT RELAY

HUMIDIFIER

OR DEHUMIDIFIER

EQUIPMENT

STAGE 2

HEAT RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.

VENTILATION

EQUIPMENT

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

(

HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO₂MONITOR WITH UNCOMMITTED CONTACTS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4478D

Fig. 12. Hookup diagram for 1-stage or 2-stage heating and cooling in conventional system with single transformer.

68-0173—3

W8900A,C

C7189A REMOTE AIR

TEMPERATURE SENSOR

CO₂MONITOR

C7100 DISCHARGE AIR

TEMPERATURE SENSOR

CO₂

PC8900

C7089A OUTDOOR AIR

TEMPERATURE SENSOR

OUT

LED

GND

FAN RELAY

HUM

VNT

STAGE 1

COOL RELAY

(HOT)

SYSTEM

TRANSFORMER

HUMIDIFIER OR

DEHUMIDIFIER

EQUIPMENT

S8610U

VENTILATION

EQUIPMENT

VENT

DAMPER

PLUG

GND

MV MV/PV PV (BURNER)

24V

GND 24V TH-W

SENSE

SPARK

PILOT

COM

2ND

MAIN

VALVE

SENSOR

OPERATOR OPERATOR

D892 VENT

DAMPER

LIMIT

CONTROLLER

DUAL VALVE COMBINATION

GAS CONTROL

IGNITER

POWER SUPPLY. PROVIDE DISCONNECT

MEANS AND OVERLOAD PROTECTION

AS REQUIRED.

PILOT

BURNER

GROUND

PILOT GAS

SUPPLY

JUMPER R TO RH TO RC FOR SINGLE

TRANSFORMER APPLICATIONS.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

(

W8900 ALLOWS CONNECTION OF A CO₂MONITOR WITH UNCOMMITTED CONTACTS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4489D

Fig. 13. Hookup diagram for heating/cooling intermittent pilot gas burning ignition system.

68-0173—3

C7189A REMOTE AIR

TEMPERATURE SENSOR

W8900A,C

^C^O2 MONITOR

C7100 DISCHARGE AIR

TEMPERATURE SENSOR

CO₂

PC8900

C7089A OUTDOOR AIR

TEMPERATURE SENSOR

OUT

LED

GND

HUM

VNT

HUMIDIFIER OR

DEHUMIDIFIER

EQUIPMENT

VENTILATION

EQUIPMENT

ZONE 2 THERMOSTAT

ZONE 3 THERMOSTAT

ZONE 4 THERMOSTAT

R8222B1067

R8239A1052

(

HOT)

ZONE 1

VALVE

ZONE 2

VALVE

ZONE 3

VALVE

ZONE 4

VALVE

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

(

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

USE ONE R8239 FOR EVERY FOUR ZONES.

USE FOR 3-WIRE ZONE VALVE OR DAMPERS.

ZONES 2, 3, 4 CAN BE CONTROLLED BY ADDITIONAL PC8900/W8900 OR OTHER THERMOSTATS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4491D

Fig. 14. Hookup diagram for 3-wire zone valves in Series 20 heating system with zone controls.

68-0173—3

W8900A,C

C7189A REMOTE AIR

TEMPERATURE SENSOR

^C^O2 MONITOR

C7100 DISCHARGE AIR

TEMPERATURE SENSOR

CO₂

PC8900

C7089A OUTDOOR AIR

TEMPERATURE SENSOR

OUT

LED

GND

FAN RELAY

HUM

VNT

STAGE 1

COOL RELAY

(HOT)

SYSTEM

TRANSFORMER

HUMIDIFIER OR

DEHUMIDIFIER

EQUIPMENT

VENTILATION

EQUIPMENT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

(HOT)

(

HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

OIL PRIMARY

W8900 ALLOWS CONNECTION OF A CO₂MONITOR WITH UNCOMMITTED CONTACTS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4490D

Fig. 15. Hookup diagram in oil heating/electric cooling system (oil primary has its own transformer).

68-0173—3

W8900B Hookup Diagrams

CO₂MONITOR

W8900B

C7189A REMOTE AIR

TEMPERATURE SENSOR

COMPRESSOR

MONITOR

C7100 DISCHARGE AIR

TEMPERATURE SENSOR

^C^O2

PC8900

C7089A OUTDOOR AIR

TEMPERATURE SENSOR

OUT

CHANGEOVER

RELAY

LED

GND

FAN RELAY

O/B

COMPRESSOR

CONTACTOR

HUM

VNT

Y1/W1

(HOT)

EMERGENCY

HEAT RELAY

SYSTEM

TRANSFORMER

AUX

AUXILIARY

HUMIDIFIER OR

DEHUMIDIFIER

EQUIPMENT

HEAT RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH.

VENTILATION

EQUIPMENT

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

(

HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO₂MONITOR WITH UNCOMMITTED CONTACTS.

CONFIGURE PC8900 FOR CHANGEOVER IN HEATING MODE OR COOLING MODE.

IF SEPARATE Y1 AND W1 TERMINALS ARE REQUIRED, REFER TO FIGURES 18 AND 19.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

CONFIGURE PC8900 FOR NO CONNECTION TO TERMINALS Y2, E, AUX AND W2 FOR

SINGLE-STAGE HEAT PUMP SYSTEM.

M4483D

Fig. 16. Hookup diagram for 2-stage heat/1-stage cool in heat pump system.

68-0173—3

^C^O2 MONITOR

C7189A REMOTE AIR

TEMPERATURE SENSOR

W8900B

COMPRESSOR

MONITOR

C7100 DISCHARGE AIR

TEMPERATURE SENSOR

^C^O2

PC8900

C7089A OUTDOOR AIR

TEMPERATURE SENSOR

OUT

CHANGEOVER

RELAY

LED

GND

FAN RELAY

O/B

STAGE 2

COMPRESSOR

(

HUM

VNT

Y1/W1

HOT)

SYSTEM

TRANSFORMER

STAGE 1

COMPRESSOR

AUX

HUMIDIFIER OR

DEHUMIDIFIER

EQUIPMENT

EMERGENCY

HEAT RELAY

AUXILIARY

HEAT RELAY

VENTILATION

EQUIPMENT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

(

W8900 ALLOWS CONNECTION OF A CO₂MONITOR WITH UNCOMMITTED CONTACTS.

CONFIGURE PC8900 FOR CHANGEOVER IN HEATING MODE OR COOLING MODE.

JUMPER Y2 AND W2 TERMINALS.

IF NO EMERGENCY HEAT RELAY, FIELD INSTALL JUMPER E TO AUX.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4485D

Fig. 17. Hookup diagram of 3-stage heat/2-stage cool heat pump system.

68-0173—3

^C^O2 MONITOR

C7189A REMOTE AIR

TEMPERATURE SENSOR

W8900B

COMPRESSOR

MONITOR

C7100 DISCHARGE AIR

TEMPERATURE SENSOR

CO₂

PC8900

C7089A OUTDOOR AIR

TEMPERATURE SENSOR

OUT

LED

GND

R8222N1011

O/B

STAGE 1 HEAT RELAY

HUM

VNT

Y1/W1

(

HOT)

SYSTEM

TRANSFORMER

AUX

STAGE 1 COOL RELAY

HUMIDIFIER OR

DEHUMIDIFIER

EQUIPMENT

HEAT

CHANGEOVER VALVE

VENTILATION

EQUIPMENT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

(

HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO₂MONITOR WITH UNCOMMITTED CONTACTS.

CONNECT HEATING CHANGEOVER VALVE TO R8222N1011 AND CONFIGURE PC8900 FOR

CHANGEOVER IN HEATING MODE.

CONNECT G, Y2, E, AUX, AND W2 TERMINALS AS REQUIRED.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4486D

Fig. 18. Hookup diagram for heat pump application requiring separate W1 and Y1 terminals with heating changeover.

68-0173—3

^C^O2 MONITOR

C7189A REMOTE AIR

TEMPERATURE SENSOR

W8900B

COMPRESSOR

MONITOR

C7100 DISCHARGE AIR

TEMPERATURE SENSOR

CO₂

PC8900

C7089A OUTDOOR AIR

TEMPERATURE SENSOR

OUT

LED

GND

R8222N1011

O/B

STAGE 1 COOL RELAY

HUM

VNT

Y1/W1

(

HOT)

SYSTEM

TRANSFORMER

AUX

STAGE 1 HEAT RELAY

HUMIDIFIER OR

DEHUMIDIFIER

EQUIPMENT

COOL

CHANGEOVER VALVE

VENTILATION

EQUIPMENT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

(

HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO₂MONITOR WITH UNCOMMITTED CONTACTS.

CONNECT COOLING CHANGEOVER VALVE TO R8222N1011 AND CONFIGURE PC8900 FOR

CHANGEOVER IN COOLING MODE.

CONNECT G, Y2, E, AUX, AND W2 TERMINALS AS REQUIRED.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4487D

Fig. 19. Hookup diagram for heat pump application requiring separate Y1 and W1 terminals with cooling changeover.

68-0173—3

W8900A,B,C Humidity Control Hookup Diagrams

lines applying to the location of the sensor. If a

remote sensor is used, humidity is only measured at

the PC8900A location.

W8900A,B,C

SYSTEM

TRANSFORMER

Location Guidelines

• Choose a location for the PC8900A where it is safe from

tampering.

(

•

Locate the PC8900A on an inside wall, about 5 ft (1.5m)

above the floor. The PC8900A can also be mounted

horizontally on a standard 2 x 4 in. (51 x 102 mm) outlet

box.

HOT)

FAN

R8222N1011 HUM

COMP

HUM

VNT

•

The wire distance between the PC8900A and W8900A-C

should not exceed 200 ft.

Install the PC8900A in an area with good air circulation at

average temperature. Avoid the following locations

because they can introduce errors in temperature

measurements:

—

Hot or cold areas caused by concealed pipes or ducts.

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

— Drafts from windows, doors, fireplaces or other heat/

cool sources.

— Convection or radiant heat from the sun or electrical

JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.

equipment.

CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE.

M18588

— Unheated areas on the other side of the wall location.

—

Dead air areas behind doors, furniture, curtains or in

corners and alcoves.

Fig. 20. Hookup diagram connecting cooling humidity

control in parallel with temperature control.

Mounting

W8900A,B,C

1. Mark the mounting location on the wall for the PC8900A

or outlet box.

Run cable from the unit to a hole at the selected wall

location. Pull approximately three inches of wire through

the hole. Color-coded 18-gauge thermostat wire is rec-

ommended. See Fig. 22.

SYSTEM

TRANSFORMER

(

HOT)

NOTE: If the old thermostat leaves marks on the wall that

the PC8900A does not cover, order part no.

HUM

VNT

205224A Wall Cover Plate to mount between the

HUMIDIFIER

PC8900A and the wall. See Fig. 23. Use the follow-

ing instructions and at step 7, put the wall cover plate

between the wall and wiring plate.

(

HOT)

WALL

WIRES

THROUGH WALL

WALL

ANCHORS

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

(

JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.

CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE.

USE OF A SEPARATE POWER SUPPLY TO RUN THE HUMIDIFIER

IS RECOMMENDED.

M4997

Fig. 21. Hookup diagram connecting humidifier

using separate transformers for humidity

control in the heating mode.

Mounting the PC8900A Control Panel

MOUNTING

HOLES (4)

NOTE: The following location guidelines apply only if a

remote sensor is not part of the installation. If a

remote sensor is installed, the PC8900A can be

installed in any convenient location, with these guide-

MOUNTING

SCREWS (3)

USE THREE MOUNTING HOLES THAT BEST

FIT APPLICATION

M4466

Fig. 22. Mounting PC8900A Wiring Plate.

68-0173—3

Remove the PC8900A from the wiring wallplate by pull-

ing the PC8900A straight off the wallplate.

Position the PC8900A Wiring Plate on the wall.

Level the wiring plate (for appearance only) using the

posts on top of the wiring plate; device functions prop-

erly even when not level.

Remove wiring plate from wall and drill 3/16 in. holes in

wall (if drywall) as marked. For firmer material such as

plaster or wood, drill 7/32 in. holes. Gently tap anchors

NOTE: When using a wall cover plate, be sure to

place the wall cover plate between the wall

and the wiring plate.

7. Position wiring plate over holes in wall or outlet box,

pulling wires through wiring opening. Loosely insert

three mounting screws into holes that best fit the appli-

cation.

8. Tighten the mounting screws.

(provided) into drilled holes until flush with the wall.

9. Reinstall the PC8900A on the wallplate by pressing the

PC8900A directly onto the wallplate.

WIRES THROUGH

WALL OPENING

205224A

WALL COVER PLATE

PC8900 WIRING

PLATE

WALL

ANCHORS

MOUNTING

SCREWS (3)

(

SYST

CHECK

PC8900

COMFORT

CENTER

CONTROL

PANEL

CHOOSE THREE MOUNTING HOLES

THAT BEST FIT APPLICATION.

M7512A

Fig. 23. Mounting PC8900A Wiring Plate and 205224A Wall Cover Plate to wall.

IMPORTANT

Wiring the PC8900A

Erratic temperature readings can occur as a result of

any of the wiring practices described below. These

practices must be avoided to assure proper opera-

tion. Use shielded cable to reduce interference if

rerouting of wiring is not possible.

Do not route thermostat wiring with building power

wiring, next to control contactors or near light dim-

ming circuits, electric motors or welding equipment.

Avoid poor wiring connections.

CAUTION

Keep wiring at least one foot away from large

—

inductive loads such as motors, line starters,

lightning ballasts and large power distribution

panels. Failure to follow these wiring practices can

introduce electrical interference (noise), which can

cause erratic system operation. Use shielded

cable to reduce interference if rerouting of wiring

is not possible. Ground the shielded cable only to

GND terminal on W8900A-C.

—

Avoid intermittent or missing building earth ground.

68-0173—3

Run cable from the W8900A-C Remote Module to a

hole at the selected wall location. Pull approximately

three inches of wire through the opening. Color-coded,

CAUTION

Disconnect the power supply before connecting

wiring to prevent electrical shock or equipment

damage.

8-gauge thermostat wire is recommended.

W8900

All wiring must comply with all applicable electrical codes,

ordinances and regulations.

Loosen the PC8900A terminal screws and insert one

wire beneath each terminal (1, 2, 3, 4). Four wires are

required at the PC8900A to assure operation. Note the

color of the wire that is attached to each terminal num-

ber to later match the colors with the terminals on the

W8900A-C Remote Module. See Fig. 10 and 24 for wir-

ing technique and wiring diagram.

Tighten screw terminals securely.

Push the excess wire back into the hole. Plug the hole

with nonhardening caulk, putty or insulation to prevent

drafts from affecting PC8900A operation.

GND

IMPORTANT

In replacement applications, more than four wires can be

available. In these applications, tape off the unused wires at

the PC8900A location and the W8900A-C location.

Mounting the C7189A Remote Sensor

(if needed)

Location Guidelines

•

Choose a location where the C7189A is safe from

tampering.

•

Locate the C7189A on an inside wall, about 5 ft (1.5m)

above the floor. The C7189A can also be mounted

vertically on a standard 2 x 4 in. (51 x 102 mm) outlet box.

The wire distance between the C7189A and W8900A-C

should not exceed 200 ft.

Install the C7189A in an area with good air circulation at

average temperature. Avoid the following locations

because they can introduce errors in sensor

measurements (see Fig. 25):

•

—

Hot or cold areas caused by concealed pipes or ducts.

Drafts from windows, doors, fireplaces or other heat/

cool sources.

NOTE WHICH COLOR WIRE IS ATTACHED TO EACH TERMINAL.

—

Convection or radiant heat from the sun or electrical

equipment.

Unheated areas on the other side of the wall location.

Dead air areas behind doors, furniture, curtains or in

corners and alcoves.

FOUR WIRES ARE REQUIRED FOR PROPER OPERATION.

IF FEWER THAN FOUR ARE AVAILABLE, ADDITIONAL WIRES

MUST BE RUN TO PC8900 LOCATION. IF MORE THAN FOUR

ARE AVAILABLE, TAPE OFF UNUSED WIRES.

—

IF SHIELDED CABLE IS REQUIRED, GROUND TO GND

TERMINAL ON W8900.

IN REPLACEMENT APPLICATIONS, PC8900 REPLACES OLD

THERMOSTATS, HUMIDISTATS, VENTILATION CONTROLS,

AND AIR CLEANER INDICATORS. BE SURE TO REMOVE

Mounting

Mark the mounting location on the wall for the C7189A

Remote Indoor Sensor or junction box.

OLD DEVICES AND TAPE OFF UNUSED WIRES.

M7519

Fig. 24. Wiring diagram for PC8900A Control Panel to

W8900A-C Remote Module.

NOTE: Order 202689A Coverplate when C7189A can-

not cover wall marks from old thermostat.

68-0173—3

YES

FEET

1.5 METERS)

(

M4476

Fig. 25. Typical location for C7189A Remote Sensor (C7189A must be

mounted in living space and not in return air duct).

Wiring the C7189A Remote Sensor

if needed)

CAUTION

(

Disconnect power supply before connecting to

wiring to prevent electrical shock or equipment

damage.

CAUTION

Wiring must comply with applicable codes, ordinances and

regulations.

Failure to follow these wiring practices can

introduce electrical interference (noise), which can

cause erratic system operation.

Wire the C7189A Remote Indoor Sensor to the

W8900A-C Remote Module terminals S1 and S. For an

example of general wiring of the C7189A, see Fig. 26.

Push excess wire back into the hole. Plug the hole with

nonhardening caulk, putty or insulation to prevent drafts

from affecting the C7189A and PC8900A performance.

Remove the C7189A Cover.

Keep wiring at least one foot away from large inductive

loads such as motors, line starters, lightning ballasts,

and large power distribution panels. Use shielded

cable to reduce interference if rerouting wire is not

possible. Ground the shielded cable to the ground

terminal on the W8900A-C.

Mount the C7189A on the wall or junction box using the

screws and anchors provided.

IMPORTANT

Erratic temperature readings from a sensor can

Level the C7189A for appearance only. The device

functions properly even when not level.

Install the C7189A Cover.

occur as a result of any of the wiring practices

described below. These practices must be avoided to

assure proper operation. Use shielded cable to

reduce interference if rerouting of sensor wiring is

not possible.

—

Do not route temperature sensor wiring with building

power wiring, next to control contactors or near light

dimming circuits, electric motors or welding equip-

ment.

—

Avoid poor wiring connections.

Avoid intermittent or missing building earth ground.

68-0173—3

W8900

C7189

LED

GND

(

HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

IF MORE THAN ONE C7189 REMOTE SENSOR IS REQUIRED, REFER TO DIAGRAM BELOW.

IF SHIELDED CABLE IS REQUIRED, GROUND TO GND TERMINAL ON W8900.

W8900

C7189

SENSORS MUST BE ARRANGED IN THIS NUMBER AND CONFIGURATION FOR PROPER OPERATION.

M4456A

Fig. 26. Wiring diagram for C7189A Remote Sensor to W8900A-C Remote Module.

•

Choose an outdoor location for the sensor where there is

good air circulation at average outdoor temperature. See

Fig. 27. Locate the sensor where it can measure the true

outdoor ambient temperature:

Mounting the C7089A Outdoor Sensor

if needed)

(

—

On a flat surface is best.

Location Guidelines

Avoid locations that can introduce errors in sensor

measurements such as areas of direct sunlight or high

temperature, or areas where hot or cold air is blowing

out of a fan or vent such as next to the compressor

discharge line in the outdoor unit.

•

Locate the C7089A Outdoor Sensor where it will be safe

from tampering.

68-0173—3

—

Mount it high enough to prevent tampering or coverage

by snow, ice or debris.

•

The wire distance between the C7089A and W8900A-C

should not exceed 200 ft.

WIRING HOLE

THROUGH

STRUCTURE

C7089

Mounting

Remove the sensor from the mounting clip.

Mark the area on the surface where the C7089A mount-

ing clip will be mounted.

Mount the clip.

W8900

OUT

LED

GND

USE APPROPRIATE MOUNTING MEANS FOR THE TYPE

OF STRUCTURE.

PLUG WIRING HOLE WITH NONHARDENING CAULK OR PUTTY.

IF SHIELDED CABLE IS REQUIRED, GROUND TO GND TERMINAL

ON W8900.

M7514

M4457

Fig. 27. Typical locations for C7089A

Outdoor Sensor.

Fig. 28. Wiring diagram for C7089A Outdoor Sensor

to W8900A-C Remote Module.

IMPORTANT

Wiring the C7089A Outdoor Sensor

if needed)

Erratic temperature readings from a sensor can

occur as a result of any of the wiring practices

described below. Use shielded cable to reduce inter-

ference if rerouting of sensor wiring is not possible.

These practices must be avoided to assure proper

operation:

(

CAUTION

Failure to use the following wiring practices can

introduce electrical interference (noise), which can

cause erratic system operation.

— Do not route temperature sensor wiring with building

power wiring, next to control contactors or near light

dimming circuits, electric motors or welding

equipment.

— Avoid poor wiring connections.

— Avoid intermittent or missing building earth ground.

Keep wiring at least one foot away from large inductive

loads such as motors, line starters, lightning ballasts,

and large power distribution panels. Use shielded

cable to reduce interference when rerouting wires is

not possible. Ground the shielded cable to the ground

terminal on the W8900A-C.

68-0173—3

Wiring the C7100A Discharge Air Sensor

if needed)

CAUTION

(

Disconnect power supply before connecting the

wiring to prevent electrical shock or equipment

damage.

CAUTION

Wiring must comply with applicable codes, ordinances and

regulations.

Failure to use the following wiring practices can

introduce electrical interference (noise), which can

cause erratic system operation.

Wire the C7089A Outdoor Sensor to the terminals

marked OUT on the W8900A-C Remote Module. If the

leadwire provided with the C7089A is not long enough,

run cable to a hole at the selected C7089A location.

Color-coded, 18-gauge thermostat wire is recom-

mended. Refer to Fig. 28 for an example of general wir-

ing for the C7089A. Pigtail wiring can be used.

Mount the C7089A in its mounting clip.

Keep wiring at least one foot away from large inductive

loads such as motors, line starters, lightning ballasts,

and large power distribution panels. Use shielded

cable to reduce interference when rerouting wires is

not possible. Ground the shielded cable to the ground

terminal on the W8900A-C.

Plug wiring hole using nonhardening caulk or putty.

IMPORTANT

Erratic temperature readings from a sensor can

occur as a result of any of the wiring practices

described below. Use shielded cable to reduce inter-

ference if rerouting sensor wiring is not possible.

These practices must be avoided to assure proper

operation:

Do not route temperature sensor wiring with building

power wiring, next to control contactors or near light

dimming circuits, electric motors or welding equip-

ment.

Mounting the C7100A Discharge Air Sensor

if needed)

(

Location Guidelines

—

•

Locate the C7100A Discharge Air Sensor in the air duct or

plenum where it can sample an average air temperature.

Avoid locations where air stratification can cause sensor

errors.

The distance between the C7100A and W8900A-C should

not exceed 200 ft.

— Avoid poor wiring connections.

— Avoid intermittent or missing building earth ground.

— If the discharge air temperature fails to display when

the check key is pressed, see the Troubleshooting

Section.

Mounting

TO MOUNT ON A FLAT DUCT OR PLENUM SURFACE:

Cut a 7/8 in. (22 mm) hole in the duct or plenum surface

at the desired location.

Insert the sensor probe into the duct or plenum with inlet

CAUTION

Disconnect power supply before connecting the

wiring to prevent electrical shock or equipment

damage.

holes facing the air stream.

If necessary, use the flange provided as a template to

mark and drill four holes for 8-32 mounting screws.

Fasten the sensor to the duct or plenum surface with

the four 8-32 sheetmetal screws provided.

Wiring must comply with applicable codes, ordinances and

regulations.

Wire the C7100A Discharge Air Sensor to the terminals

marked T and T1 on the W8900A-C Remote Module. Use 1/4

in. female quick connects on the C7100A.

TO MOUNT IN A 2 X 4 IN. JUNCTION BOX:

Cut a 7/8 in. (22 mm) hole in the duct or plenum surface

at the desired location.

Remove the center rear knockout from the 2 x 4 in. junc-

tion box and insert the sensing probe through the

knockout with the flange flat against the junction box.

Using the flange (provided) as a template, mark and drill

four holes in the junction box and the duct or plenum

surface for 8-32 mounting screws.

Insert sensor probe through both the junction box

knockout and the 7/8 in. (22 mm) hole drilled in the duct

or plenum and fasten the junction box and sensor to the

duct or plenum surface.

INSTALLER SETUP

IMPORTANT

Installer setup must be done for the HVAC equip-

ment and the PC8900A/W8900A-C to operate

properly.

The installer setup mode is used by the installer to configure

the PC8900A/W8900A-C for the HVAC equipment used at the

installation (heating, cooling, ventilation, humidification, air

cleaning) and to configure the PC8900A operation

(changeover mode, remote sensors, and outdoor sensors).

68-0173—3

TO ENTER THE INSTALLER SETUP MODE:

System Options

Hold the PC8900A CHECK key until all display seg-

ments are displayed (approximately three seconds).

See Fig. 29.

When SYSTEM is flashing, the following list of options

pertaining to the equipment and sensors connected to the

system appears on the PC8900A display. To make each

selection, press the CHECK key. See Table 4 for setting

options.

Press the up and down arrowhead keys at the same

time. The display goes blank, except for up to four seg-

ments (SYSTEM, HEAT, COOL, FAN) as shown in

Fig. 30. One of these segments flashes. The flashing

segment indicates the current menu selection.

SYSTEM OFF AUTO

AUX HEAT SET PT

COOL SET PT

FAN

AUTO

CIRC

TO CHANGE TO ANOTHER SELECTION:

SUN MON TUE WED THU FRI SAT WAKELEAVERETURNSLEEP TEMPORARY VENT

Press the up or down arrowhead key until the desired

segment is flashing.

M6360

Once the desired segment is flashing, press the

CHECK key for options within that segment. The

options are SYSTEM, HEAT, COOL and FAN.

Press RUN to exit the installer setup.

Fig. 29. All segments on display.

Table 4. System Setting Options

Other Choices (Press

Up or Down Arrowhead

Keys to Change)

Factory-Setting

Description

System switch is configured for

manual changeover HEAT-OFF-

COOL or EM HT-HEAT-OFF-COOL.

System switch is configured for automatic

changeover HEAT-OFF-COOL-AUTO or

EM HT-HEAT-OFF-COOL-AUTO.

M6375

M6361

Five-minute compressor protection is

on; calls for cooling (heat pump) are

followed by a five-minute enforced

shutdown.

No compressor protection exists. Calls for

cooling (heat pump) can occur

immediately.

M6376

M6362

System does not have a C7189A

Remote Indoor Sensor.

System does have a C7189A Remote

Indoor Sensor.

M6363

M6364

M6365

M6377

System does not have a C7100A

Discharge Air Sensor.

System does have a C7100A Discharge

Air Sensor.

M6378

System uses PC8900A temperature

only. If the system is configured for a

remote sensor (SENS REM Y),

temperature control is averaged

between C7189A Remote Indoor

Sensor and PC8900A Control Panel.

System uses C7189A Remote Indoor

Sensor only. Be sure the system is

configured for remote sensor

(SENS REM Y).

M6379

System does not have a C7089A

Outdoor Sensor.

System does have a C7089A Outdoor

Sensor.

M6366

M6380

System has an Energy Recovery

Ventilator (for example, Honeywell

ER90). Calls for ventilation, close

System has an outside air damper. Calls

for ventilation close VNT contacts and

activate system fan.

M6367

M6381

System has no ventilation equipment. A

call for ventilation activates the system fan.

M6382

Communications should always be

configured to N. If CM8900A

Communication Module is present, it

changes to Yes automatically.

Communication module is activated.

W8900A-C automatically changes to this

setting when communication is received.

M6368

M6383

W8900B model only. O/B terminal

energized in heating only. Use this

setting for heat pumps with heating

changeover.

W8900B model only. O/B terminal

energized in cooling only. Use this setting

for heat pumps with cooling changeover.

M6369

M6384

System has a humidifier that is used

in the heating mode.

System has no humidifier.

M6370

M6385

68-0173—3

Table 4. System Setting Options

Other Choices (Press

Up or Down Arrowhead

Factory-Setting

Description

Keys to Change)

Description

System set to control humidity in

System does not control high humidity in

cooling.

cooling. Can also have reheat

M6371 (W8900C only).

M6386

PC8900A displays temperature

settings and readings in °F.

PC8900A displays temperature settings

and readings in °C.

M6387

M6372

PC8900A displays setpoint times and

clock times (12-hour clock) with AM

M6373 and PM.

PC8900A displays setpoint times and clock

times (24-hour clock) with military time.

M6388

System is set for Adaptive Intelligent

System is set for conventional recovery.

When recovering from setback modes,

M6389 programmed times indicate when recovery

begins.(See Operation section for

description.)

Recovery™. When recovering from

M6374 setback modes, programmed times

indicate when recovery ends. (See

Operation section for description).

The humidity option can only be set for heat or cool. If both are set to Y, it will not honor either one.

Heat Options

When HEAT is flashing, refer to Table 5 for the options

SYSTEM

HEAT

COOL

FAN

pertaining to the heat equipment that appear in the PC8900A

display after each press of the CHECK key. HEAT and its list

of options appear only when the system allows field selection

of cycle rates, and only stages present in the remote module

hardware are shown.

SYSTEM

CHECK

ONE OF THESE SEGMENTS WILL BE FLASHING.

M6401

Fig. 30. Initial display for installer setup.

Table 5. Heating Cycle Rates.

Display Shows

Stage 2^a

AUX HT

W2 CPH 6^bAUX HT CPH 6^bEM. HT. CPH 6^b

Cycles per

Hour Setting

System

Stage 1

W1 CPH 6^b

W1 CPH 9

EM. HT.

Gas or Oil Forced Air

Electric Heat

W2 CPH 9

W2 CPH 3

AUX HT CPH 9

AUX HT CPH 3

EM. HT. CPH 9

EM. HT. CPH 3

Single Stage Heat Pump,

Hydronic Heat, Condensing

Gas Furnaces

W1 CPH 3

Radiant Floor Heat, Gravity

W1 CPH 1

W2 CPH 1

AUX HT CPH 1

EM. HT. CPH 1

Cooling-only Application; no Not connected

heat sources connected

W1 CPH NC

W2 CPH NC

AUX HT CPH NC EM. HT. CPH NC

N/A^c

4.5

W1 CPH 4.5

W1 CPH 2.5

W1 CPH 2

W2 CPH 4.5

W2 CPH 2.5

W2 CPH 2

AUX HT CPH 4.5 EM. HT. CPH 4.5

AUX HT CPH 2.5 EM. HT. CPH 2.5

AUX HT CPH 2

EM. HT. CPH 2

W1 CPH 1.5

W2 CPH 1.5

AUX HT CPH 1.5 EM. HT. CPH 1.5

When W2 is not used, configure W2 cycle rate to NC (not connected).

Factory setting.

Use these cycle rate settings if faster or slower cycling is required.

68-0173—3

Press the up or down arrowhead key until the word HEAT is

flashing on the PC8900A display.

Table 6. Cooling Cycle Rates.

Cycles per

Hour

Setting

Display Shows

The PC8900A/W8900A-C is designed to be used on most

types of heating systems. Initially, the PC8900A/W8900A-C

are factory-set to be used on the following systems:

PC8900A/W8900A,C models: Stage 1 and 2 heat:

Conventional noncondensing gas or oil fired furnace (six

cycles per hour at 50 percent load).

System

Stage 1

Stage 2

Recommended

setting

Y1 CPH 3

(factory

setting)

Y2 CPH 3

(factory

setting)

N/A^a

_N_/_Aa

Y1 CPH 9

Y1 CPH 6

Y1 CPH 1

Y2 CPH 9

Y2 CPH 6

Y2 CPH 1

PC8900A/W8900B models: Stage 1, 2 and 3 heat: Heat

pump (three cycles per hour at 50 percent load).

Natural gas air

conditioning

The cycle requirements for each stage of heat can be

changed to match the type of heating system used. See Table

for the cycle rate options available and the equipment that

Heating-only

application

Not

Y1 CPH NC

Y2 CPH NC

corresponds with each cycle rate.

connected

N/A^a

4.5

2.5

Y1 CPH 4.5

Y1 CPH 2.5

Y1 CPH 2

Y2 CPH 4.5

Y2 CPH 2.5

Y2 CPH 2

Cool Options

When COOL is flashing, see Table 6 for options for the cooling

equipment stages that appear in the display in the following

order after each press of the CHECK key.

_N_/_Aa

1.5

Y1 CPH 1.5

Y2 CPH 1.5

Use these cycle rate settings if faster or slower cycling is

required.

Fan Options

When FAN is flashing, refer to Table 7 for the options

pertaining to the fan equipment that appear in the display in

the following order after each press of the CHECK key.

Table 7. Fan Setting Options.

Other Choices (Press

Up or Down Arrowhead

Keys to Change)

Display

Description

When PC8900A calls for heat,

PC8900A also calls for fan

When PC8900A calls for heat, fan is

energized by equipment

(Conventional).

M6390

M6391

(Electric Heat).

No fan overrun in cooling.

80-second fan overrun after PC8900A

ends call for cooling.

M6392

M6393

Option not used on the W8900B model.

PROGRAMMING PC8900A

The Comfort Center™ control panel must have 24 Vac to

program.

Setting the Current Day and Time

NOTES:

The current day and time need to be set. This activates the

preprogram in the Comfort Center™ panel. See Table 8 for

the preprogram settings.

—

Always press the keys with a fingertip or similar

blunt tool. Sharp instruments like a pen or pencil

point can damage the keyboard.

Table 8. PC8900A Preprogram.

—

Check the Glossary section for definitions of

unfamiliar words.

Heating Cooling

Fan

Vent

Period Start Time Temp

Temp

Setting Setting

1. Press SET CLOCK. The display shows a time and day.

Press and hold DAY until the current day appears in the

display.

Saturday

WAKE (6:00 AM) (70°F)

LEAVE (8:00 AM) (62°F)

RETURN (6:00 PM) (70°F)

SLEEP (10:00 PM) (62°F)

(78°F)

(85°F)

(78°F)

(82°F)

(AUTO) (OFF)

3. Press and hold a TIME key until the current time

appears in the display. Be sure AM or PM appear as

desired.

Press RUN to exit the SET CLOCK program mode.

68-0173—3

The current day and time are now programmed. The

e. Press and hold the up or down arrowhead key until

the display shows the desired temperature.

preprogrammed schedule is activated. The preprogrammed

settings can be customized or cleared. When using the

preprogrammed settings as is, programming is done. To

customize or create a new program, follow the steps in the

Setting a Customized Program section. Operating the Comfort

Center™ section shows how to make any temporary changes.

SYSTEM

CHECK

HEAT SET PT COOL

FAN

AUTO

CLOCK

SET

HEAT OFF COOL

SYSTEM

DAY

AUTO ON CIRC

FAN

SETPOINTS

HEAT/COOL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

CANCEL

RUN

M6210

f. Press HEAT/COOL SETPOINTS to switch to COOL

SET PT.

Setting a Customized Program

SYSTEM

CHECK

HEAT

COOL SET PT

FAN

AUTO

HEAT/COOL

SETPOINTS

C LS OE CT K

HEA

COOL

DAY

AUTO

CIRC

HS E AT PT /OC I ON OT SL

Planning your Program

PERIOD

SELECT

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

WAKE

M6231

Plan a schedule before programming. Leave any period blank

when no setting is required. When an outdoor sensor is part of

the system, enter a frost setting. The humidity and frost

settings are the same for the entire program.

NOTE: The time is used for both heating and cooling.

When you change the time while setting the

cooling temperatures, the time is also changed

for heating.

Programming the First Day

When changing the existing program, go to step 7a. When

clearing the program and starting over, proceed as follows.

g. Press and hold the up or down arrowhead key until

the display shows the desired temperature.

SYSTEM

NOTE: Press the RUN key at any time to exit the program-

ming mode.

HEAT

COOL SET PT FAN

AUTO

CHECK

C LS OE CT K

HEA

COOL

DAY

AUTO

CIRC

HS E AT PT /OC I ON OT SL

SP EE LR E

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6232

. Clearing Current Program

a. Press SELECT PERIOD.

NOTE:

SYSTEM

CHECK

HEAT SET PT

WAKE

COOL

—

When the numbers do not move while you are

holding the up or down arrowhead key, the setting

limit (45°F and 88°F) is reached.

SELECT

C LS OE CT K

HEA

COOL

DAY

AUT

CIRC

HS E AT PT /OC I ON TO SL

PERIOD

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

CANCEL

M6206

—

When set for auto changeover, there must be 3°F

between the heating and cooling setpoints. When

setting the cooling setpoint with the heating setpoint

at 68°, the cooling setpoint can be no lower than 71°.

And when cooling is set for 70°, the heat setpoint

changes to 67°. The PC8900A automatically pushes

the alternate setpoint so you can adjust the setpoint

to its desired setting.

b. Hold CANCEL until display shows PROG CLR.

SYSTEM

CHECK

CANCEL

C LS OE CT K

HEA

COOL

DAY

AUT

CIRC

HS E AT PT /OC I ON OT SL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6205

. Setting Day, Time, and Setpoints

— When set for manual changeover, the 3° differential

between the heating and cooling setpoint does not

apply.

a. Press SELECT PERIOD until display shows WAKE.

SYSTEM

HEAT SET PT

COOL

CHECK

SELECT

PERIOD

C LS OE CT K

HEA

COOL

DAY

AUT

CIRC

HS E AT PT /OC I ON TO SL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

3. Setting Fan

MON

WAKE

CANCEL

M6206

IMPORTANT

The FAN and VENTILATOR settings are the same

b. Press DAY until display shows MON.

SYSTEM

HEAT SET PT

COOL

CHECK

for heating and cooling. The FAN setting for heating

cannot be set for AUTO and the cooling set for CIRC.

C LS OE CT K

HEA

COOL

DAY

AUT

CIRC

HS E AT PT /OC I ON OT SL

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

WAKE

CANCEL

M6207

a. Press FAN until FAN AUTO, FAN ON or FAN CIRC

c. When display reads COOL SET PT, press HEAT/

COOL SETPOINTS to switch to HEAT SET PT.

is displayed, as desired.

SYSTEM

CHECK

HEAT

COOL SET PT

FAN

SYSTEM

CHECK

HEAT SET PT

COOL

FAN

AUTO

HEAT/COOL

SETPOINTS

C LS OE CT K

HEA

DAY

AUTO

CIRC

HS EE AT PT /OC I ON OT SL

AUTO ON CIRC

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

C LS OE CT K

HEA

COOL

DAY

AUT

CIRC

HS E AT PT /OC I ON TO SL

CANCEL

WAKE

PERIOD

SELECT

HUMIDITY

TIME

VENTILATE

HOLD

RUN

M6213

CANCEL

M6209

d. Press and hold a TIME key until the display shows

the desired starting time. The time changes in ten-

minute increments.

NOTES:

—

AUTO means the fan only runs when heating or

cooling is running.

SYSTEM

CHECK

TIME

C LS OE CT K

HEA

COOL

DAY

AUT

CIRC

HS E AT PT /OC I ON OT SL

TIME

SP EE LR E

HUMIDITY

VENTILATE

HOLD

RUN

TIME

MON

CANCEL

M6215

68-0173—3

c. Press and hold SELECT PERIOD until the desired

period is displayed.

. Setting Ventilator

a. Press VENTILATE to display VENT when increased

ventilation is desired during the WAKE period.

SYSTEM

HEAT SET PT COOL

CHECK

SELECT

SYSTEM

HEAT

COOL SET PT

FAN

C LS OE CT K

HEA

DAY

AUTO

CIRC

HS EE AT PT /OC I ON OT SL

CHECK

PERIOD

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

AUTO

SAT

LEAVE

FAN

CANCEL

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT SL

M6236

AUTO ON CIRC

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

WAKE

M6213

d. Press HEAT/COOL SETPOINTS to switch between

HEAT SET PT and COOL SET PT.

b. When normal ventilation is desired, press VENTI-

LATE until VENT is not displayed.

SYSTEM

CHECK

HEAT SET PT

COOL

FAN

AUTO

HEAT/COOL

SETPOINTS

SYSTEM

C LS OE CT K

HEA

DAY

AUTO

CIRC

HS EE AT PT /OC I ON TO L

CHECK

HEAT

COOL SET PT

FAN

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

AUTO

LEAVE

CANCEL

VENTILATE

C LS OE CT K

HEAT OFF COOL

SYSTEM

AUTO ON CIRC

FAN

HS E AT PT /OC I ON TO SL

M6237

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

WAKE

M6212

e. Press and hold a TIME key until the desired start

time is displayed.

5. Programming LEAVE, RETURN and

SYSTEM

CHECK

TIME

SLEEP

CLOCK

SET

SYSTEM

AUTO ON CIRC

FAN

SETPOINTS

HEAT/COOL

HEAT OFF COOL

DAY

TIME

SP EE LR

HUMIDITY

VENTILATE

HOLD

TIME

SAT

LEAVE

CANCEL

RUN

a. Repeat steps 2a through 4b for each period to be

programmed on Monday.

M6238

f. Press and hold up or down arrowhead key until the

desired temperature is displayed.

The Comfort Center™ Monday program is now complete.

SYSTEM

CHECK

HEAT SET PT COOL

FAN

AUTO

Programming The Remaining Days

C LS OE CT K

HEA

COOL

DAY

AUTO

CIRC

HS E AT PT /OC I ON OT SL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6210

. Copying the First Day Program

g. Follow steps 3a and 4a when changes to the fan

and ventilator settings are desired.

a. Hold down the DAY key until all the days of the

week have appeared on the screen.

SYSTEM

IMPORTANT

When in a program, pressing the CANCEL key until

PROGRAM CLR appears (approximately three sec-

onds) cancels your entire program and you need to

start again with step 3.

CHECK

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT S

DAY

SP EE LR E

HUMIDITY

TIME

VENTILATE

HOLD

RUN

SUN

SLEEP

CANCEL

M6233

b. Press RUN key to save and start the program.

SYSTEM

CHECK

8. Canceling One Program Period

RUN

C LS OE CT K

CIRC

HS EE AT PT /OC I ON OT SL

a. Press CANCEL while you are in the period to be

cancelled. The programmed time, temperature, vent

and fan settings for that period for that day

disappear.

HEA

DAY

AUT

SP EE LR E

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

CANCEL

M6230

NOTE: The Monday program is now copied to all seven

days of the week. If copy fails, start over (see Pro-

gramming the First Day section).

SYSTEM

HEAT SET PT

COOL

CHECK

CANCEL

C LS OE CT K

HEA

COOL

DAY

AUTO

CIRC

HS E AT PT O/ CI ON TO SL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

WAKE

CANCEL

M10017

. Changing the Program

a. Press SELECT PERIOD to enter the programming

mode.

9. Starting the Program

a. Press RUN to start the program.

SYSTEM

HEAT SET PT COOL

CHECK

SELECT

SYSTEM

CHECK

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON TO

PERIOD

SP EE LR

HUMIDITY

VENTILATE

HOLD

RUN

TIME

MON

WAKE

CANCEL

RUN

C LS OE CT K

CIRC

HS EE AT PT /OC I ON OT SL

M6234

HEA

DAY

AUTO

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

CANCEL

M6230

b. Press DAY until the desired day is displayed.

SYSTEM

HEAT SET PT COOL

CHECK

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT SL

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

SAT WAKE

CANCEL

M6235

68-0173—3

c. Press RUN to exit the program mode.

0. Programming the System Setting

a. Press SYSTEM until desired setting (HEAT, OFF,

COOL, AUTO, EM HEAT) is displayed.

SYSTEM

CHECK

RUN

C LS OE CT K

CIRC

HS EE AT PT /OC I ON OT SL

HEA

DAY

AUTO

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

SYSTEM

CANCEL

CHECK

M6230

SYSTEM

HEAT OFF COOL

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT SL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

The Comfort Center™ program is now customized.

CANCEL

M6227

HEAT: The Comfort Center™ program controls the heating

system.

OFF: Both the heating and cooling systems are off. OFF

Operating the Comfort Center™ Control

System

flashes in the display.

COOL: The Comfort Center™ program controls the cooling

system.

AUTO: The Comfort Center™ program automatically changes

between heating and cooling, depending on the indoor

temperature. (AUTO must be configured by the installer.)

EM HEAT:(Select Models Only): The Comfort Center™

program controls only the emergency heat.

Changing Current Period Settings

Temporary changes to the current period allow for those times

when someone comes home early, stays up late, or plans an

evening out. The settings are in effect until the next regularly

scheduled period starts.

. Temperature Setpoint

1. Programming Humidity Setting

a. Press HEAT/COOL SETPOINTS to display either

HEAT SET PT (if changing heat setpoint) or COOL

SET PT (if changing cool setpoint).

a. Press HUMIDITY. The display shows HUMID with a

percentage.

SYSTEM

CHECK

HEAT SET PT

COOL

CHECK

HEAT/COOL

SETPOINTS

HUMIDITY

C LS OE CT K

OFF OOL

SYSTEM

AUTO ON CIRC

FAN

HS EE AT PT /OC I ON OT SL

C LS OE CT K

HEA

COOL

DAY

AUTO

CIRC

HS E AT PT /OC I ON OT SL

DAY

PERIOD

SELECT

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6209

M6228

b. Press and hold up or down arrowhead key until the

desired temperature is displayed.

b. Press and hold the up or down arrowhead key until

desired humidity setting is displayed. The available

choices range from 10 to 80 percent in 5 percent

increments.

SYSTEM

CHECK

HEAT SET PT COOL

FAN

AUTO

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT SL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

SYSTEM

CHECK

CANCEL

TEMPORARY

M6216

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT SL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6229

. Fan Setting

a. Press FAN to display the AUTO, ON or CIRC fan

12. Programming Frost Setting

setting, as desired.

(

If Applicable)

SYSTEM

CHECK

FAN

a. Press HUMIDITY a second time and the display

AUTO

FAN

AUTO ON CIRC

C LS OE CT K

HEA

DAY

AUTO

CIRC

HS EE AT PT /OC I ON OT SL

shows FROST.

PERIOD

SELECT

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6221

SYSTEM

CHECK

HUMIDITY

C LS OE CT K

SYSTEM

AUTO ON CIRC

FAN

HS EE AT PT /OC I ON OT SL

HEAT OFF COOL

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

3. Ventilation Setting

CANCEL

M6239

a. Press VENTILATE to display VENT or not, as

desired.

NOTE: The factory setting is 5, but the range is 0 to

0. When there is too much condensation,

SYSTEM

CHECK

HEAT SET PT

COOL

FAN

AUTO

lower the number but if the air is dry, change

the setting to a higher number.

VENTILATE

C LS OE CT K

HEA

DAY

AUTO

ON CIRC

HS EE AT PT /OC I ON TO L

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

TEMPORARY VENT

CANCEL

M6224

b. Press up or down arrowhead key until the desired

setting is displayed.

Changing Settings for One Week or Less

This feature allows setting one temperature that the Comfort

Center™ program holds continuously for up to one week, until

the day and time programmed.

SYSTEM

CHECK

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT SL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6240

68-0173—3

NOTE: To cancel steps 4a. through 4f., press the

CANCEL key.

. Programming Hold for 1 to 7 Days

a. Press HOLD.

SYSTEM

The temperature, fan and ventilation setting are in effect until

the day and time selected. At that time, the Comfort Center™

program returns to the regularly programmed settings.

HEAT

COOL SET PT

CHECK

HOLD

C LS OE CT K

AUTO ON CIRC

FAN

HS EE AT PT /OC I ON TO L

HEA

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6241

Changing Settings for an Indefinite Amount of Time

The hold feature keeps one temperature that the Comfort

Center™ program holds continuously until CANCEL is

pressed to resume the program.

b. Press HEAT/COOL SETPOINTS to display either

HEAT SET PT (if holding heat setpoint) or COOL

SET PT (if holding cool setpoint).

SYSTEM

HEAT

COOL SET PT

CHECK

HOLD

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON TO

5. Programming Indefinite Hold

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6241

a. Press HOLD.

c. Press and hold up or down arrowhead key until

desired holding temperature is displayed.

SYSTEM

HEAT

COOL SET PT

CHECK

HOLD

C LS OE CT K

AUTO ON CIRC

FAN

HS EE AT PT /OC I ON TO L

HEA

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

SYSTEM

CANCEL

HEAT SET PT COOL

M6241

CHECK

HEAT/COOL

C LS OE CT K

HEA

COOL

DAY

AUT

CIRC

SEE

OT SL

SETPOINTS

SP EE LR

HUMIDITY

VENTILATE

b. Press HEAT/COOL SETPOINTS to display either

HEAT SET PT (if holding heat setpoint) or COOL

SET PT (if holding cool setpoint).

TIME

CANCEL

RUN

M6242

d. Press FAN for fan setting and VENTILATE for venti-

lation setting during hold.

SYSTEM

HEAT SET PT COOL

CHECK

HEAT/COOL

SYSTEM

C LS OE CT K

HEA

COOL

DAY

AUTO

CIRC

SEE

OT SL

CHECK

HEAT SET PT COOL

FAN

SETPOINTS

SP EE LR

HUMIDITY

TIME

VENTILATE

AUTO

CANCEL

RUN

FAN

AUTO ON CIRC

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT SL

M6242

SP EE LR EC DT

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6244

c. Press and hold up or down arrowhead key until

desired holding temperature is displayed.

SYSTEM

CHECK

HEAT SET PT COOL

FAN

SYSTEM

AUTO

HEAT SET PT COOL

CHECK

VENTILATE

C LS OE CT K

SYSTEM

AUTO ON CIRC

FAN

HS EE AT PT /OC I ON TO L

HEAT OFF COOL

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

VENT

C LS OE CT K

HEA

COOL

DAY

AUTO

CIRC

SEE

OT SL

SP EE LR

HUMIDITY

TIME

VENTILATE

M6245

CANCEL

RUN

M6243

e. Press DAY until the desired end day is displayed.

d. Press FAN for desired fan setting and VENTILATE

for desired ventilation setting during hold.

SYSTEM

CHECK

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT S

SYSTEM

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CHECK

HEAT SET PT COOL

FAN

FRI

CANCEL

AUTO

M6246

FAN

C LS OE CT K

HEA

DAY

AUTO

CIRC

HS EE AT PT /OC I ON OT SL

AUTO ON CIRC

SP EE LR EC DT

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

f. Press a TIME key until the desired end time is dis-

played.

M6244

SYSTEM

CHECK

HEAT SET PT COOL

FAN

SYSTEM

CHECK

AUTO

TIME

VENTILATE

CLOCK

SET

SYSTEM

AUTO ON CIRC

FAN

SETPOINTS

HEAT/COOL

HEAT OFF COOL

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT S

FRI

VENT

TIME

SP EE LR

HUMIDITY

VENTILATE

HOLD

RUN

CANCEL

RUN

TIME

M6245

CANCEL

M6247

NOTE: To cancel steps 5a. through 5d., press the

CANCEL key.

68-0173—3

Canceling Program Settings.

2. Review Current Setpoints and Readings

Use the following instructions to check the setpoints for the

current period only and to check the actual humidity and

outdoor readings.

Each period can be canceled.

. Canceling Period

a. Press DAY until the desired day appears in the dis-

play.

NOTE: Return to the program at any time by pressing RUN.

SYSTEM

a. Press CHECK to display the current humidity or

outside temperature (if outside sensor is installed).

CHECK

C LS OE CT K

HEA

COOL

DAY

AUT

CIRC

HS E AT PT /OC I ON TO SL

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

THU

LEAVE

CANCEL

SYSTEM

CHECK

M6249

b. Press and hold SELECT PERIOD until the desired

period to cancel for that day appears in the display.

CHECK

CLOCK

SET

HEA

DAY

AUTO

CIRC

HS EE AT PT /OC I ON OT SL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

SYSTEM

CHECK

SELECT

C LS OE CT K

HEA

COOL

DAY

AUT

CIRC

HS E AT PT /OC I ON OT SL

PERIOD

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

THU

RETURN

M6250

CANCEL

M6200

c. Press CANCEL. The time and temperature disap-

pears from the display.

b. Press CHECK again to display the current humidity

reading.

SYSTEM

HEAT SETPT COOL

CHECK

SYSTEM

CHECK

CANCEL

C LS OE CT K

COOL

CIRC

HS E AT PT /OC I ON OT SL

HEA

DAY

AUT

CHECK

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

C LS OE CT K

HEA

DAY

AUTO

CIRC

HS EE AT PT /OC I ON OT SL

MON

RETURN

M6251

PERIOD

SELECT

HUMIDITY

VENTILATE

HOLD

RUN

CANCEL

TIME

CANCEL

M6252

d. Press RUN to return to normal operation.

c. Press HUMIDITY to display the setpoint.

SYSTEM

CHECK

SYSTEM

CHECK

RUN

C LS OE CT K

CIRC

HS EE AT PT /OC I ON OT SL

HEA

DAY

AUT

HUMIDITY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

C LS OE CT K

HEA

DAY

AUTO

CIRC

HS EE AT PT /OC I ON OT SL

CANCEL

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

M6230

CANCEL

M6253

d. Press CHECK to display two temperatures and

Review Program Settings and Current Readings

. Review All of Program Settings

HEAT SET PT or COOL SET PT in the display.

SYSTEM

CHECK

HEAT

COOL SET PT

CHECK

C LS OE CT K

CIRC

HS EE AT PT /OC I ON OT SL

HEA

DAY

AUTO

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6255

IMPORTANT

Changes can be made to the program when using

e. Press HEAT/COOL SETPOINT to display the other

setpoint.

this review process.

—

Press SELECT PERIOD to enter the program.

SYSTEM

CHECK

HEAT SET PT

COOL

HEAT/COOL

SETPOINTS

SYSTEM

C LS OE CT K

HEA

DAY

AUTO

CIRC

HS EE AT PT /OC I ON TO L

HEAT SET PT COOL

CHECK

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

SELECT

PERIOD

M6256

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON TO L

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

WAKE

CANCEL

M6234

f. Press CHECK again to display the current FAN

setting.

—

Press DAY for each day of the week and press

SELECT PERIOD to review each period. The display

shows the day, period, time, temperature setpoints,

fan and vent settings.

SYSTEM

CHECK

FAN

AUTO

CHECK

C LS OE CT K

CIRC

HS EE AT PT /OC I ON OT SL

HEA

DAY

AUTO

PERIOD

SELECT

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

M6257

SYSTEM

HEAT SET PT COOL

CHECK

g. Press CHECK again to display the current VENT

setting.

C LS OE CT K

HEA

DAY

AUT

CIRC

HS EE AT PT /OC I ON OT SL

DAY

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

SAT WAKE

CANCEL

M6235

SYSTEM

CHECK

—

Press RUN to exit the review.

CHECK

C LS OE CT K

ON CIRC

HS EE AT PT /OC I ON OT SL

HEA

DAY

AUTO

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

SYSTEM

CANCEL

CHECK

M6258

RUN

C LS OE CT K

CIRC

HS EE AT PT /OC I ON OT SL

HEA

DAY

AUT

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

CANCEL

M6230

68-0173—3

h. Press CHECK again to display the system setting.

CHECKOUT

SYSTEM

CHECK

C LS OE CT K

CIRC

HS EE AT PT /OC I ON OT SL

HEA

DAY

AUT

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

CANCEL

CAUTION

Do not operate the cooling system when outside

temperature is below 50°F (10°C). See compressor

manufacturer instructions for further information.

M6259

i. Press CHECK or RUN to return to the program.

SYSTEM

CHECK

RUN

C LS OE CT K

CIRC

HS EE AT PT /OC I ON OT S

IMPORTANT

HEA

DAY

AUT

SP EE LR

HUMIDITY

TIME

VENTILATE

HOLD

RUN

MON

CANCEL

•

W8900A-C must have ac power to perform self-test.

Five-minute time delay on compressor does not

function during checkout.

M6230

•

Activating or Deactivating Keyboard Lockout

Perform the following test as a check of all the W8900A-C

functions. If W8900A-C does not respond as indicated,

replace the W8900A-C.

When the keyboard lockout is activated, the programs, time

and day, humidity and installer setup information cannot be

changed. However, hold, temporary settings and the system

setting can be changed. Use the following steps to check or

change the keyboard setting.

Checkout is activated from the W8900A-C Remote Module.

The PC8900A Control Panel does not have to be connected

to use the checkout. If the PC8900A is connected, the

PC8900A displays Wait during checkout.

Press and hold RUN until OPEN KEY or LOCK KEY

show in the display (approximately three seconds). The

display returns to normal when RUN is no longer

pressed.

NOTE: The W8900A-C (and PC8900A, if connected),

returns to normal when the checkout is interrupted

for two minutes.

To change the setting, press RUN a second time until

the other display appears.

Start the checkout by disconnecting sensor wires from

S, S1, T and T1 (if attached).

Connect a jumper between S and S1 terminals.

Connect a jumper between T and T1 terminals.

Turn the power off and on. The LED should be on. Fol-

low the steps in Table 9 or 10.

NOTE: The sequence restarts after the last step in the

table.

After completing the steps in the table, remove the T to

T1 and S to S1 jumpers and reinstall the sensor wires (if

applicable). The W8900A-C LED blinks.

Table 9. Conventional System Checkout.

Result

Step

LED Terminals Energized

Equipment Operation

Fan relay is energized.

G, O/B^a^b

Remove jumper from T terminal.

Reconnect jumper to T terminal.

Remove jumper from T terminal.

Reconnect jumper to T terminal.

Off

G, W1, O/B^a^b

G, W1, W2, O/B^a^b

G, Y1

Fan and first-stage heat are energized.

Fan, first- and second-stage heat are energized.

First- and second-stage heat are de-energized. Fan and

first stage cooling are energized.

Remove jumper from T terminal.

Reconnect jumper to T terminal.

Off

G, Y1, Y2

Fan, first- and second-stage cooling are energized.

G, Y1, Y2, HUM

Fan, first- and second-stage cooling with the humidifier are

energized.

Remove jumper from T terminal.

Off

G, Y1, Y2, HUM, VNT Fan, first- and second-stage cooling with the humidifier and

ERV are energized.

Reconnect jumper to T terminal.

None

All equipment is de-energized.

Remove jumper from T1, S and S1 On

terminals.

Return PC8900A to normal operation.

This is the terminal sequence for W8900A1012.

On conventional models with the O/B relay (changeover) populated, it is energized in the heating mode. The default mode for

power up is heat. If the installer test mode is cycled through cooling to all relays off with the intent of repeating the test, the O/B

relay is not energized until the first stage of heat is cycled on.

68-0173—3

Table 10. Heat Pump System Checkout. ^a

Result

Step

LED Terminals Energized

Equipment Operation

Fan relay is energized.

Remove jumper from T terminal.

Reconnect jumper to T terminal.

Remove jumper from T terminal.

Reconnect jumper to T terminal.

Off

G, W1/Y1, O/B^b

G, W1/Y1, W2, O/B^b

G, W1/Y1, W2, AUX,

Fan and first-stage heat are energized.

Fan, first- and second-stage heat are energized.

Fan, first-, second- and auxiliary-stage heat are energized.

O/B

G, E, O/B^b

Remove jumper from T terminal.

Off

First- and second-stage heat are de-energized. Fan and

emergency heat are energized.

G, W1/Y1, O/B^b

G, W1/Y1, Y2, O/B^b

G, W1/Y1, Y2, O/B^b,

HUM

Reconnect jumper to T terminal.

Remove jumper from T terminal.

Reconnect jumper to T terminal.

Off

Fan and first-stage cooling are energized.

Fan, first- and second-stage cooling are energized.

Fan, first- and second-stage cooling with the humidifier are

energized.

G, W1/Y1, Y2, O/B^b,

HUM, VNT

Remove jumper from T terminal.

Off

Fan, first- and second-stage cooling with the humidifier and

VNT are energized.

Reconnect jumper to T terminal.

None

All equipment is de-energized.

Remove jumper from T1, S and S1 On

terminals.

Returns PC8900A to normal operation.

The polarity configuration of the reversing valve relay (O/B) determines if the O/B is always energized on first call for heat or

cool. If the reversing valve energizes with heat, then it de-energizes with cooling. Factory setting is for O/B to energize with a

call for heat.

O/B is energized based on installer setup or configuration.

Installer Display of all Segments and Product Codes

OPERATION

(

Optional)

Press and hold CHECK key until all segments of the dis-

play are lighted. See Fig. 31.

The PC8900A, C7089A, C7189A, C7100A and CO monitor

sense the temperature, humidity and CO conditions in the

Press the CHECK key four more times to view each of

the following items:

living space. This information is then transferred to the

W8900A-C Remote Module, which activates the proper

equipment based on the programmed settings.

—

Order specification number of the Comfort Center™

control system.

Manufacturing date code and software revision

numbers of the Comfort Center™ control system.

Order specification number of the remote module.

Manufacturing date code and software revision

numbers of the remote module.

Conventional vs. Adaptive Intelligent

Recovery™ Operation

—

Press the CHECK key to return to normal operation.

Conventional Recovery

Conventional temperature recovery starts the heating or

cooling system at the programmed set time. See Fig. 32.

Using conventional recovery requires setting the program

period times earlier than the area is occupied so the area will

be comfortable. The program may need to be adjusted

periodically to accommodate for weather and seasonal

changes. The conventional recovery method is used when

Adaptive Intelligent Recovery™ operation is disabled.

SYSTEM OFF AUTO

AUX HEAT SET PT

COOL SET PT

FAN

SYSTEM

CHECK

AUTO

CIRC

SUN MON TUE WED THU FRI SAT WAKELEAVERETURNSLEEP TEMPORARY VENT

0 F

SETPOINT

TEMPERATURE

M6400

ACTUAL

TEMPERATURE

Fig. 31. All segments on display.

60 F

SLEEP

WAKE

M6404

Fig. 32. Conventional recovery ramp.

68-0173—3

Adaptive Intelligent Recovery™ Operation

Adaptive Intelligent Recovery™ operation is Honeywell’s

trademark for the way the Comfort Center™ system controls

the heating and cooling equipment during recovery from an

energy savings setting (SLEEP, LEAVE) to a comfort setting

COMPRESSOR SETPOINT

AUXILIARY HEAT SETPOINT

ROOM TEMPERATURE

(WAKE, RETURN). This provides additional energy savings.

The advantages are:

•

Comfort setting is achieved at the programmed time and

maintained regardless of the weather conditions;

occupants come home and wake up in comfort.

Drafts from low temperature discharge air are minimized

during occupied periods.

Comfort Center™ control system automatically uses the

more economical first stage of the heat pump as the

primary heat source during the heat mode recovery,

avoiding the use of the expensive second-stage of heating

WAKE

M6406A

•

Fig. 33. Heat pump Adaptive Intelligent Recovery™ ramp.

Operation

Seasonal weather changes allow the Adaptive Intelligent

Recovery™ ramp to change on a daily basis and still meet the

comfort needs of the occupants. In the fall, heating loads are

light so recovery begins very late in the energy savings

period. As fall changes to winter, loads increase and the

Adaptive Intelligent Recovery™ ramp shifts so recovery

begins earlier each day. Conversely, recovery begins later

each day as heating loads decrease from winter to spring.

See Fig. 34 and 35.

(

auxiliary heat).

•

Comfort and energy savings can be achieved in both

heating and cooling.

Reduces heat pump and air conditioner compressor

cycling, extending equipment life.

Adaptive Intelligent Recovery™ operation is used during

recovery from energy savings. It is bypassed when configured

for conventional recovery but not when setpoint is temporarily

changed. When Adaptive Intelligent Recovery™ operation is

bypassed, the system operates the stages of equipment like a

conventional control.

70 F

SETPOINT

TEMPERATURE

PC8900A Used with W8900A,C Remote Module

ACTUAL

TEMPERATURE

(

Conventional Heat/Cool Applications)

During recovery, the Comfort Center™ program calculates the

amount of time required to bring the living space from the

current room temperature (achieved in the energy savings

mode) to the comfort temperature programmed for the

comfort mode. When that time is reached, the present

setpoint changes from the energy savings setpoint to the

comfort setpoint. The result is that the living space

temperature is at the programmed setpoint at the

programmed time, providing the occupants with the maximum

comfort. See Fig. 33.

60 F

SLEEP

WAKE

M6185A

HEATING MODE

Fig. 34. Fall to winter Adaptive

Intelligent Recovery™ ramp.

0 F

PC8900A Used with W8900B Remote Module

(Heat Pump Applications)

SETPOINT

TEMPERATURE

During recovery, the Comfort Center™ program works to

achieve comfort in the same manner, by calculating the

amount of time required to bring the living space from the

current room temperature to the comfort temperature

programmed for the comfort mode. The living space

temperature reaches the programmed setpoint at the

programmed time so the occupants achieve maximum

comfort.

ACTUAL

TEMPERATURE

0 F

SLEEP

WAKE

M6186

Fig. 35. Winter to spring Adaptive

Intelligent Recovery™ ramp.

Another way the Comfort Center™ program minimizes

auxiliary heat usage is by having two recovery ramps: one for

stage-one compressor and one for auxiliary heat.

Energy Savings Period

In mild to moderate weather, the PC8900A calls on the heat

pump only when the sensed temperature falls below the

setpoint. Under mild to moderate conditions, the more

costly auxiliary heat is not needed. In severe weather, the

heat pump cycles only when the sensed temperature falls

below setpoint and auxiliary heat cycles continuously. See

Fig. 36 through 38.

68-0173—3

Heat Pump Recovery

In Mild Weather

When outdoor temperature is mild; for example 50°F (10°C),

the recovery from energy savings is handled completely by

the heat pump, without the need for auxiliary heat. The heat

pump starts only after the setpoint has risen above the sensed

temperature and is locked on until the comfort setpoint is

reached. See Fig. 36.

COMPRESSOR

SETPOINT

AUXILIARY

HEAT SETPOINT

ROOM

TEMPERATURE

WAKE

COMPRESSOR:

OFF

AUXILIARY

HEAT:

OFF

COMPRESSOR

SETPOINT

M6189

AUXILIARY

HEAT SETPOINT

Fig. 38. Adaptive Intelligent Recovery™ ramp for

a heat pump in severe weather (0°F).

ROOM

TEMPERATURE

WAKE

Comfort Period

In mild weather, the heat pump cycles continuously to

maintain the sensed temperature within 1°F of the setpoint. In

moderate weather, the heat pump cycles longer, minimizing

the need for auxiliary heat. The heat pump runs the majority of

the time in severe weather and only shuts off for brief periods

using auxiliary heat to maintain temperature within 1°F of

setpoint. See Fig. 36 through 38.

COMPRESSOR:

OFF

AUXILIARY HEAT:

OFF

M6187

Fig. 36. Adaptive Intelligent Recovery™ ramp for

a heat pump in mild weather (50°F).

THERMAL PERFORMANCE

In Moderate Weather

During severe weather, the PC8900A actually controls closer

to the setpoint than a conventional control. This is because

the heat anticipator is replaced by two electronic control

strategies—cycling by heat anticipation and proportional plus

integral (P+I) control.

When outdoor temperature is close to the balance point of the

heat pump, the heat pump runs continuously during the

recovery period and auxiliary heat cycles if necessary.

See Fig. 37.

Electronic cycling by heat anticipation acts like a traditional

heat anticipator except that it never needs adjusting for

various control circuit load currents. It cycles off the heating

system slightly before the room temperature reaches the

setpoint to keep heat that remains in the ductwork from

overheating the room.

COMPRESSOR

SETPOINT

AUXILIARY

HEAT SETPOINT

In severe weather, a conventional control with a heat

anticipator tends to turn off the system too soon so the

effective setpoint is somewhat below the setpoint. In very cold

weather, the difference between setpoint and effective control

point can be 5°F or 6°F (2°C or 3°C) with a conventional

control. This phenomenon is called droop.

ROOM

TEMPERATURE

WAKE

COMPRESSOR:

OFF

AUXILIARY HEAT:

OFF

M6188

Proportional plus integral action eliminates droop by adjusting

the on time of the stage until the control point matches the

setpoint. The PC8900A maintains the space temperature

within 1°F of the setpoint when the temperature has stabilized

after an energy saving period.

Fig. 37. Adaptive Intelligent Recovery™ ramp for

a heat pump in moderate weather (20°F).

In Severe Weather

This zero droop performance provides improved occupant

comfort and energy savings. Occupants do not need to

continually adjust thermostat settings to maintain desired

temperature, even during severe weather.

When the outdoor temperature is below the balance point of

the heat pump, the heat pump and auxiliary heat run

continuously in the recovery period. See Fig. 38.

Remote Communications

Adding the CM8900A Communications Module and the

W8735B Telephone Access Module gives the PC8900A/

W8900A-C remote communications. Users are able to control

current setpoint and system settings. They can monitor the

68-0173—3

outdoor temperature, humidity, current setpoint, system mode,

alarm out on High-Low temperature, filter status and

equipment failure. See separate instructions on CM8900A

and W88735B for more detailed information.

Humidity Control (W8900A and B)

IMPORTANT

The humidity configuration can only be set for heat or

cool by the installer. If configured for both, the

Comfort Center™ control system ignores both set-

tings and no humidity control is activated.

Minimum-Off Timing

A minimum-off timer in the Comfort Center™ control systeml

assures that the cooling compressor or heat pump

compressor does not come on again for at least five minutes

after it turns off. The minimum-off timer is triggered when the

compressor goes off and when the system switch is changed.

If the compressor turns off when the setpoint is changed, then

the minimum-off timer is triggered. The minimum-off timer

operates during the first stage of cooling on the W8900A

and C. The minimum-off timer operates during the first stage

of both heating and cooling on the W8900B. The minimum-off

timer can be disabled in the installer setup mode and can be

overridden in the checkout mode.

Heat Mode

Heat humidification is activated when the sensed RH is below

the setpoint RH and the fan is on. When a ventilator is

installed and configured and the RH is above the setpoint, the

Comfort Center™ program calls for ventilation to lower the

humidity.

Cool Mode

Cool dehumidification is activated when the sensed RH is

above the setpoint. This can cause overcooling; see W8900C

Humidity Control section.

Fan Control

Dehumidification equipment can be controlled in many ways.

See Installation section for hookup drawings.

The fan comes on when any of these conditions are present (it

can take up to 20 seconds for the fan to turn on).

NOTES:

Humidity Control with Fan

FAN ON: This setting means the fan runs 100

percent of the time during this period.

Select models of the W8900A-C can be configured to control

humidity levels while the fan is energized. This type of

humidity control does not require the heat output to be

energized. In order for the humidity terminals (“HUM”) to

energize, the following conditions must be met:

FAN AUTO: The AUTO setting means the fan runs

only with the heating or cooling system.

System switch must be in the heat mode or in Auto

mode with heat being the last call.

There must be a call for humidity (sensed relative

humidity [RH] is below RH setpoint).

Fan terminal (“G”) must be energized through program-

ming or by pressing the fan button on the PC8900A.

FAN CIRC: When the fan is set to CIRC, the fan runs

at least 30 percent of the time, including the time the

fan is on while the heating or cooling system is run-

ning. When the heating or cooling system is not

running at all, the fan runs for ten minutes on, and 20

minutes off. Protection against fan short cycling is

built into the device.

Frost Control

The frost Control needs an outdoor sensor to be activated.

The Comfort Center™ control system calculates the

possibility of condensation or frost forming by using the

outside temperature and inside temperature to determine the

dewpoint. When the dewpoint would cause frost or

condensation, the humidification request will not be honored.

The frost setting has a value range of zero to ten with zero

representing glass with poor insulation and ten representing

glass with perfect insulation.

The installer setup has the ability to extend fan operation

following a cooling cycle. When selected, the fan run time at

the end of a cooling cycle is extended 80 seconds.

Ventilation Control

When the Comfort Center™ program is configured for

ventilation, the ventilator contacts are closed, activating high

speed ventilation equipment in response to any of the

following conditions:

NOTE: Set the frost setting to 10 to severely limit the frost

control.

•

Ventilation request from the user.

High CO condition (measured by CO monitor).

High humidity condition while in the heating mode.

Programming.

W8900C Humidity Control

The W8900C can be configured to control humidity levels in

both the heat and cool modes. A humidifier is connected to

the HUM terminals. The HUM contacts close and activate a

humidifier when the sensor RH is below the setpoint RH.

Dehumidification equipment is controlled by the Y1,Y2, and G

terminals. These contacts close to activate the air conditioning

equipment when the sensed RH is above the setpoint RH.

The ventilation control is set for a 20-second cycle so the user

can wait up to 20 seconds for the ventilation to start after the

request is made.

When the Comfort Center™ program is configured for no

ventilation, the system fan is activated in response to a call for

ventilation. When the Comfort Center™ system is configured

for a VNT damper, calls for ventilation close the VNT damper

contacts and activate the system fan.

The reheat feature is designed to keep the occupants

comfortable. If the cooling setpoint is reached, but the

dehumidification setpoint is not satisfied, the Comfort

Center™ program turns on the heat. When the heat raises the

temperature so there is a call for cooling and the

NOTE: Each period can have a ventilation program.

68-0173—3

dehumidification requirement is still not met, cooling starts

again. This switching continues until the dehumidification and

cooling setpoints are met. This feature assures that the

occupants do not experience excessive temperature drop due

to the need for dehumidification.

C7089A Outdoor Temperature Sensor

The outdoor temperature sensor is necessary for the Frost

control feature to be activated. The Comfort Center™ control

system takes the outdoor temperature reading and calculates

the dewpoint to help prevent humidity from accumulating on

the windows. With the C7089A installed and configured, the

user can read the outdoor temperature by pressing the

CHECK key. See Fig. 39 for the resistance vs. temperature

characteristics for the C7089A Outdoor Temperature Sensor.

When a C7089A Outdoor Temperature Sensor is configured

and installed and the PC8900A is configured for humidity

control in the heating mode, the frost control feature is

enabled.

CO Monitor

When a CO monitor is configured and installed, the Comfort

Center™ programl turns on ventilation (if configured for

ventilation), or system fan (if configured for no ventilation), in

response to a high CO monitor reading.

OUTDOOR TEMPERATURE

OHMS OF

RESISTANCE

900

800

700

-40.0

-37.2

-34.4

-31.7

-28.9

-26.1

-23.3

-20.6

-17.8

-15.0

-12.2

-9.4

2929 to 2905

2953 to 2929

2978 to 2953

3002 to 2978

3026 to 3002

3050 to 3026

3074 to 3050

3099 to 3074

3123 to 3099

3147 to 3123

3171 to 3147

3195 to 3171

3220 to 3195

3244 to 3220

3268 to 3244

3292 to 3268

3316 to 3292

3341 to 3316

3365 to 3341

3389 to 3365

3413 to 3389

3437 to 3413

3462 to 3437

3486 to 3462

3510 to 3486

3534 to 3510

3558 to 3534

3583 to 3558

3607 to 3582

3631 to 3607

3655 to 3631

3679 to 3655

3703 to 3679

3728 to 3703

3752 to 3728

3776 to 3752

3800 to 3776

3824 to 3800

3849 to 3824

-20

-10

600

500

400

-6.7

3300

3200

3100

3000

2900

-3.9

-1.1

1.7

4.4

7.2

10.0

12.8

15.6

18.3

21.1

23.9

26.7

29.4

32.2

35.0

37.8

40.6

43.3

46.1

48.9

51.7

54.4

57.2

60.0

62.8

65.6

800

-20

(-29)

(-18)

(-7)

(5)

(16)

(27)

100

(38)

120

(49)

140

(60)

160

(79) ( C )

(

-40)

TEMPERATURE

RESISTANCE INCREASES 4.84 OHMS PER 1 F CHANGE OR 8.7 OHMS PER 1 C CHANGE.

M6358

Fig. 39. C7089A Outdoor Temperature Sensor and C7100A Discharge Temperature Sensor

resistance vs. temperature performance characteristics.

Check message. See Fig. 39 for the resistance vs. tempera-

ture characteristics for the C7100A Discharge Air Temperature

Sensor.

C7100A Discharge Air Temperature Sensor

The C7100A Discharge Air Temperature Sensor mounts on

the duct wall or plenum surface with integral mounting flange

or in a 2 x 4 in. junction box. The C7100A senses the air tem-

perature in the discharge and if the temperature is not

acceptable for the heating or cooling setting, the Comfort

Center™ control system lights the check LED and presents a

The discharge air temperature is displayed on the PC8900A

when the Check key is pressed. If the PC8900A is configured

for a discharge air temperature but the discharge air tempera-

ture is not displayed, then a power outage has cleared the

discharge air temperature reading from the Check feature. To

re-establish the discharge air temperature, enter the installer

68-0173—3

setup mode for a few seconds. After the RUN key is pressed,

the discharge air temperature is displayed when the CHECK

key is pressed (until another power outage occurs).

Keypad Lockout

The keypad lockout feature allows temporary settings to be

made, but the installer setup and program settings can not be

changed. This feature gives the PC8900A the security of a

locking cover with flexibility to meet the user’s schedule. To

activate keypad lockout, press and hold RUN until LOCK KEY

shows on the display (approximately three seconds). To

deactivate keypad lockout, press and hold RUN until OPEN

KEY shows on the display.

NOTE: When a discharge air temperature sensor is installed

and configured in an application, we recommend

interrupting the power supply briefly before leaving

the site. This removes the discharge air temperature

from the display when the CHECK key is pressed

and avoids confusion.

CHECK Key

C7189A Remote Indoor Temperature Sensor

Press the PC8900A CHECK key to display the following

information:

The C7189A Wall Mount Temperature Sensor provides the

input required by the Comfort Center™ control system to

sense the indoor air space temperature. See Fig. 40 for the

resistance vs. temperature characteristics for the C7189A

Remote Indoor Temperature Sensor.

•

Outdoor temperature (if C7089A installed).

Humidity level in room.

Discharge air temperature (if C7100A installed).

Heating and cooling setpoints.

Fan setting.

Ventilation setting.

System setting.

At a remote location, the C7189A can also average

temperature in several ways:

•

PC8900A and one C7189A.

Four or nine C7189As in series/parallel networks.

PC8900A and a C7189A network (four or nine sensors).

If the Check LED is lighted, troubleshooting messages are

displayed. Refer to Fig. 41 for flowchart of troubleshooting

messages.

NOTE: The remote temperature (or temperature averaging

network temperature) is displayed on the PC8900A

with the Time, Day, and Mode of operation. Pressing

the CHECK key does not display the remote temper-

ature separately.

300

200

100

000

900

ROOM TEMPERATURE

OHMS OF

RESISTANCE

7.8

8.9

2131 to 2094

2094 to 2057

2057 to 2019

2019 to 1982

1982 to 1945

1945 to 1908

1908 to 1871

1871 to 1833

1833 to 1796

1796 to 1759

1759 to 1722

1722 to 1685

1685 to 1647

1647 to 1610

1610 to 1573

1573 to 1536

1536 to 1499

1499 to 1461

1461 to 1424

1424 to 1387

1387 to 1350

1350 to 1313

1313 to 1275

1275 to 1238

1238 to 1201

1201 to 1164

1164 to 1127

1127 to 1089

10.0

11.1

12.2

13.3

14.4

15.6

16.7

17.8

18.9

20.0

21.1

22.2

23.3

24.4

25.6

26.7

27.8

28.9

30.0

31.1

32.2

33.3

34.4

35.6

36.7

37.8

800

700

600

1500

1400

1300

1200

1000

(

(10)

(16)

(21)

(27)

(32)

100

(38) ( C )

TEMPERATURE

RESISTANCE DECREASES 18.6 OHMS PER 1 F

CHANGE OR 33.4 OHMS PER 1 C CHANGE.

M6357

Fig. 40. C7189A Remote Temperature Sensor resistance vs. temperature performance characteristics.

68-0173—3

TROUBLESHOOTING

See Fig. 41 for troubleshooting procedures.

IF THE CHECK LED IS LIT, USE THE FOLLOWING TROUBLESHOOTING INFORMATION.

. PRESS THE CHECK KEY.

PC8900 DISPLAY SHOWS:

POSSIBLE CAUSE

ACTION

COMMUNICATIONS WITH THE HOME

SYSTEM AND W8900 CANNOT

BE ESTABLISHED.

• CHECK CONNECTIONS BETWEEN HOME SYSTEM AND

COMMUNICATION MODULE.

• CHECK COMMUNICATIONS BUS.

•

RECONFIGURE PC8900

CONNECTION BETWEEN PC8900 AND

W8900 CANNOT BE ESTABLISHED.

• RECONFIGURE PC8900.

DISCHARGE AIR SENSOR IS PRESENT

AND INDICATES A COOL SYSTEM

FAILURE WHILE IN COOLING MODE.

• CHECK CONNECTIONS BETWEEN C7100 AND W8900.

• REFER TO MANUFACTURER SPECIFICATIONS TO

TROUBLESHOOT EQUIPMENT.

WRONG DISCHARGE AIR SENSOR IS

INSTALLED.

• CHECK THAT C7100 DISCHARGE AIR SENSOR IS BEING USED.

• CHECK CONNECTIONS BETWEEN C7100 AND W8900.

W8900 CANNOT READ DISCHARGE

AIR TEMPERATURE.

PC8900 CONFIGURED FOR DISCHARGE

AIR TEMPERATURE SENSOR, BUT NOT

INSTALLED.

• RECONFIGURE PC8900.

WRONG DISCHARGE AIR SENSOR IS

INSTALLED.

• CHECK THAT C7100 DISCHARGE AIR SENSOR IS BEING USED.

FAN RUN TIME HAS EXCEEDED

20 HOURS.

1. CLEAN AIR CLEANER CELLS OR REPLACE AIR FILTER.

2. PRESS CANCEL KEY WHILE VIEWING FILT CHG MESSAGE.

DISCHARGE AIR SENSOR IS PRESENT

AND INDICATES A HEAT SYSTEM

FAILURE WHILE IN HEATING MODE.

• CHECK CONNECTIONS BETWEEN C7100 AND W8900.

• REFER TO MANUFACTURER SPECIFICATIONS TO

TROUBLESHOOT EQUIPMENT.

WRONG DISCHARGE AIR SENSOR

IS INSTALLED.

•

CHECK THAT C7100 DISCHARGE AIR SENSOR IS BEING USED.

HEAT PUMP COMPRESSOR FAILURE

RELAY HAS ENERGIZED W8900 L

TERMINAL.

• CHECK HEAT PUMP. REFER TO MANUFACTURER

SPECIFICATIONS TO TROUBLESHOOT EQUIPMENT.

W8900 CANNOT READ OUTDOOR AIR

TEMPERATURE.

• CHECK CONNECTIONS BETWEEN C7089 AND W8900.

• RECONFIGURE PC8900 FOR LOCAL SENSOR ONLY.

PC8900 CONFIGURED FOR OUTDOOR

TEMPERATURE SENSOR, BUT NOT

INSTALLED.

WRONG OUTDOOR TEMPERATURE

SENSOR IS INSTALLED.

• CHECK THAT C7089 OUTDOOR TEMPERATURE SENSOR IS

BEING USED.

W8900 CANNOT READ DISCHARGE

AIR TEMPERATURE.

• CHECK CONNECTIONS BETWEEN C7100 AND W8900.

• RECONFIGURE PC8900.

PC8900 CONFIGURED FOR DISCHARGE

AIR TEMPERATURE SENSOR, BUT NOT

INSTALLED.

WRONG DISCHARGE AIR SENSOR IS

INSTALLED.

• CHECK THAT C7100 AVERAGING DISCHARGE AIR SENSOR IS

BEING USED.

PC8900 HUMIDITY SENSOR IS

INOPERATIVE.

• REPLACE PC8900.

PC8900 TEMPERATURE SENSOR HAS

FAILED.

• REPLACE PC8900.

• RECONFIGURE PC8900 FOR REMOTE SENSOR USE.

IF THE COMM CHK LIGHT IS CAUSED BY HEAVY COMMUNICATION FROM THE CM8900, IT DISAPPEARS IN 5 SECONDS. NO ACTION IS NEEDED.

M6193B

Fig. 41. Troubleshooting procedures.

68-0173—3

IF THE CHECK LED IS LIT, USE THE FOLLOWING TROUBLESHOOTING INFORMATION.

PRESS THE CHECK KEY.

PC8900 DISPLAY SHOWS:

POSSIBLE CAUSE

ACTION

W8900 CANNOT READ OUTDOOR AIR

TEMPERATURE.

• CHECK CONNECTIONS BETWEEN C7089 AND W8900.

PC8900 CONFIGURED FOR OUTDOOR

TEMPERATURE SENSOR, BUT NOT

INSTALLED.

• RECONFIGURE PC8900 FOR LOCAL SENSOR ONLY.

WRONG OUTDOOR TEMPERATURE

SENSOR IS INSTALLED.

• CHECK THAT C7089 OUTDOOR TEMPERATURE SENSOR IS

BEING USED.

W8900 CANNOT READ REMOTE SPACE

TEMPERATURE.

•

CHECK CONNECTIONS BETWEEN C7189 AND W8900.

PC8900 CONFIGURED FOR REMOTE

SENSOR OPERATION, BUT C7189 IS

NOT INSTALLED.

• RECONFIGURE PC8900.

WRONG REMOTE SENSOR IS

INSTALLED.

• CHECK THAT C7189 REMOTE TEMPERATURE SENSOR IS

BEING USED.

TEMPERATURE AVERAGING NETWORK

IS IN USE, BUT SENSORS ARE NOT

CONFIGURED CORRECTLY.

• CHECK WIRING OF SENSORS AND COMPARE TO SENSOR

HOOKUP DRAWINGS.

SYSTEM PROBLEM.

• PRESS CHECK KEY TO VIEW FURTHER MESSAGES ON

PC8900 DISPLAY.

LINK BETWEEN PC8900 AND W8900

CANNOT BE ESTABLISHED.

• CHECK CONNECTIONS 2-3 ON PC8900.

THE PC8900 IS IN THE PROCESS OF

COMMUNICATING WITH THE W8900.

• NONE. THE "WAIT" WILL DISAPPEAR IN A SHORT TIME.

M6193B

SYMPTOM

POSSIBLE CAUSE

ACTION

NO DISPLAY ON PC8900.

NO POWER TO PC8900.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE

OR RESET IF NECESSARY.

•

CHECK THAT HEAT OR COOL SYSTEM POWER IS ON.

MAKE SURE PC8900 IS CORRECTLY MOUNTED ON WIRING

WALLPLATE.

•

MAKE SURE TERMINALS 1 THROUGH 4 ARE PROPERLY

CONNECTED BETWEEN PC8900 AND W8900.

HEATING WILL NOT COME ON.

NO POWER TO W8900.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE

OR RESET IF NECESSARY.

•

CHECK THAT HEAT SYSTEM POWER IS ON.

CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900, C7189,

AND EQUIPMENT.

PC8900 SYSTEM SETTING IS INCORRECT.

• CHECK THAT PC8900 IS SET TO HEAT, EM. HT. OR AUTO.

5-MINUTE COMPRESSOR PROTECTION

ACTIVATED.

• IN HEAT PUMP APPLICATIONS, THE PC8900 HAS A

5-MINUTE BUILT-IN TIME DELAY (IF ACTIVATED). ALLOW UP

TO FIVE MINUTES AFTER CHANGING THE SETTING BEFORE

THE COMPRESSOR STARTS.

PC8900 INOPERATIVE.

• CONDUCT SELF-TEST. SEE CHECKOUT.

REFER TO MANUFACTURER SPECIFICATIONS TO

TROUBLESHOOT EQUIPMENT.

•

INCORRECT WIRING.

• SEE WIRING DIAGRAM.

HEATING EQUIPMENT IS INOPERATIVE.

• REFER TO MANUFACTURER SPECIFICATIONS TO

TROUBLESHOOT EQUIPMENT.

HEATING SETPOINT IS TOO LOW.

• ADJUST SETPOINT USING

AND

KEYS.

HEATING SYSTEM IS NOT COMPATIBLE.

• REFER TO WIRING DIAGRAMS. ADD R8222 RELAY, R8339

CONTROL CENTER, OR S566 SWITCH IF REQUIRED.

ROOM TEMPERATURE AT REMOTE

SENSOR LOCATION IS TOO HIGH.

• RELOCATE REMOTE SENSOR WHERE IT IS NOT AFFECTED

BY HOT AREAS, COLD AREAS, OR DEAD-AIR AREAS.

PC8900 CONFIGURED FOR ONLY ONE

STAGE OF HEATING.

• RECONFIGURE PC8900 TO ACCOMMODATE ALL STAGES OF

HEAT REQUIRED.

M18742

Fig. 41. Troubleshooting procedures (Continued).

68-0173—3

SYMPTOM

POSSIBLE CAUSE

ACTION

TEMPERATURE CHANGES

OCCUR AT THE WRONG TIMES.

PC8900 PROGRAMMED INCORRECTLY.

• CHECK THE PROGRAM TIMES FOR THE PERIOD IN QUESTION.

BE SURE THAT AM AND PM INDICATIONS ARE CORRECT.

MAKE SURE THE CURRENT DAY AND TIME ARE CORRECT.

REPROGRAM IF NECESSARY.

•

REMEMBER THAT WITH ADAPTIVE INTELLIGENT RECOVERY™

THE HEATING OR COOLING SYSTEM COMES ON BEFORE

THE WAKE AND RETURN START TIMES SO THE HOUSE WILL

BE AT THE DESIRED TEMPERATURE WHEN THE PERIOD

STARTS. SYSTEM CAN BE CONFIGURED FOR CONVENTIONAL

RECOVERY. REFER TO INSTALLATION SECTION.

ADAPTIVE INTELLIGENT RECOVERY™

IS SELECTED.

PRESENT SETTING APPEARS

INACCURATE.

ADAPTIVE INTELLIGENT RECOVERY™

IS SELECTED.

• REMEMBER THAT WITH ADAPTIVE INTELLIGENT RECOVERY™

THE HEATING OR COOLING SYSTEM COMES ON BEFORE

THE WAKE AND RETURN START TIMES SO THE HOUSE WILL

BE AT THE DESIRED TEMPERATURE WHEN THE PERIOD

STARTS. SYSTEM CAN BE CONFIGURED FOR CONVENTIONAL

RECOVERY. REFER TO INSTALLATION SECTION.

HEAT AND COOL SETPOINTS

NEED TO BE ADJUSTED

REGULARLY.

AND KEYS BEING USED

TO ADJUST TEMPERATURE.

• REPROGRAM PC8900 TO MAKE PERMANENT CHANGE IN

PROGRAM. REFER TO PROGRAMMING INSTRUCTIONS.

TIME AND DAY HAVE BEEN LOST DUE

TO POWER OUTAGE.

• REPROGRAM TIME AND DAY. REFER TO PROGRAMMING

INSTRUCTIONS.

PC8900 DISPLAY FLASHES

DURING OPERATION.

PARTIAL PC8900 DISPLAY.

INOPERATIVE PC8900.

NO POWER TO W8900.

• REPLACE PC8900.

COOLING WILL NOT COME ON.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND

REPLACE OR RESET IF NECESSARY.

•

CHECK THAT COOL SYSTEM POWER IS ON.

CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900,

C7189, OR EQUIPMENT.

PC8900 SYSTEM SETTING IS INCORRECT.

• CHECK THAT PC8900 IS SET TO COOL OR AUTO.

5-MINUTE COMPRESSOR PROTECTION

ACTIVATED.

• THE PC8900 HAS A 5-MINUTE BUILT-IN TIME DELAY (IF

ACTIVATED). ALLOW UP TO FIVE MINUTES AFTER CHANGING

THE SETTING BEFORE THE COMPRESSOR STARTS.

•

CONDUCT SELF-TEST. SEE CHECKOUT.

REFER TO MANUFACTURER SPECIFICATIONS TO

TROUBLESHOOT EQUIPMENT.

PC8900 INOPERATIVE.

INCORRECT WIRING.

• SEE WIRING DIAGRAM.

COOLING EQUIPMENT IS INOPERATIVE.

• REFER TO MANUFACTURER SPECIFICATIONS TO

TROUBLESHOOT EQUIPMENT.

COOLING SETPOINT IS TOO HIGH.

• ADJUST SETPOINT USING

AND

KEYS.

ROOM TEMPERATURE AT REMOTE

SENSOR LOCATION IS TOO LOW.

• RELOCATE REMOTE SENSOR WHERE IT IS NOT AFFECTED

BY HOT AREAS, COLD AREAS, OR DEAD-AIR AREAS.

PC8900 CONFIGURED FOR ONLY ONE

STAGE OF COOLING.

• RECONFIGURE PC8900 TO ACCOMMODATE ALL STAGES OF

COOLING.

SYSTEM FAN IS RUNNING

INDEPENDENT OF HEATING

OR COOLING EQUIPMENT.

PC8900 FAN SETTING IS SET AT

FAN CIRC.

• CIRCULATING FAN FEATURE ALLOWS FAN TO OPERATE

INDEPENDENT OF HEATING OR COOLING EQUIPMENT.

REFER TO OPERATION SECTION.

PC8900 IS CONFIGURED FOR ELECTRIC

HEAT FAN OPERATION.

• RECONFIGURE PC8900 FOR NO ELECTRIC HEAT FAN.

PC8900 IS CONFIGURED FOR OVERRUN

IN COOLING.

• RECONFIGURE PC8900 FOR NO FAN OVERRUN IN COOLING.

M18743

Fig. 41. Troubleshooting procedures (Continued).

68-0173—3

SYMPTOM

POSSIBLE CAUSE

ACTION

HUMIDIFICATION EQUIPMENT

WILL NOT COME ON IN

HEATING.

• RECONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING

(APPLIES TO W8900A,B ONLY).

PC8900 IS NOT CONFIGURED PROPERLY.

HUMIDITY SETTING IS TO LOW.

• ADJUST HUMIDITY SETTING USING

AND

KEYS.

PC8900 IS CONFIGURED FOR FROST

CONTROL.

• TO PREVENT FROST FROM FORMING ON WINDOWS, SOME

CALLS FOR HUMIDIFICATION WILL NOT BE ALLOWED. REFER

TO INSTALLATION AND OPERATION SECTION.

NO POWER TO HUMIDIFIER.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE

OR RESET IF NECESSARY.

•

CHECK THAT EQUIPMENT POWER IS ON.

CHECK FOR LOOSE CONNECTIONS ON EQUIPMENT, PC8900

AND W8900.

GREEN LED ON W8900 IS NOT

OPERATING.

NO POWER TO W8900.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND

REPLACE OR RESET IF NECESSARY.

•

CHECK THAT COOL SYSTEM POWER IS ON.

CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900,

C7189, OR EQUIPMENT.

DEHUMIDIFICATION EQUIPMENT

PC8900 IS NOT CONFIGURED PROPERLY.

HUMIDITY SETTING IS TO HIGH.

• RECONFIGURE PC8900 FOR HUMIDITY CONTROL IN COOLING

(APPLIES TO W8900A,B ONLY).

(COOLING) WILL NOT COME ON

IN COOLING.

• ADJUST HUMIDITY SETTING USING

AND

KEYS.

EQUIPMENT COMPRESSOR PROTECTION

ACTIVATED.

• EQUIPMENT HAS A MINIMUM-OFF TIME TO PROTECT THE

COMPRESSOR (IF ACTIVATED). ALLOW UP TO FIVE MINUTES

AFTER CHANGING THE SETTING BEFORE THE COMPRESSOR

STARTS.

NO POWER TO DEHUMIDIFIER (COOLING)

EQUIPMENT.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE

OR RESET IF NECESSARY.

•

CHECK THAT EQUIPMENT POWER IS ON.

CHECK FOR LOOSE CONNECTIONS ON EQUIPMENT PC8900

AND W8900.

VENTILATION EQUIPMENT

WILL NOT COME ON.

PC8900 IS NOT CONFIGURED PROPERLY.

• RECONFIGURE PC8900 FOR VNT OR OUTSIDE AIR DAMPER.

NO POWER TO VENTILATION

EQUIPMENT.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE

OR RESET IF NECESSARY.

•

CHECK THAT EQUIPMENT POWER IS ON.

CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900 OR

VENTILATION EQUIPMENT.

VENTILATION EQUIPMENT IS

RUNNING INDEPENDENT

OF PC8900.

2 2

• WHEN CO SENSOR SENSES HIGH CO CONDITION, SYSTEM

FAN AND VENTILATION ARE ACTIVATED TO VENTILATE LIVING

SPACE.

A HIGH CO CONDITION EXISTS IN THE

LIVING SPACE.

A REMOTE SWITCH IS CALLING FOR

VENTILATION.

• TURN REMOTE SWITCH OFF.

• RECONFIGURE PC8900 FOR F.

TEMPERATURES ARE

DISPLAYED IN C.

PC8900 IS NOT CONFIGURED PROPERLY.

TIME IS DISPLAYED IN MILITARY

TIME (EX: 14:00).

• RECONFIGURE PC8900 FOR 12 HOUR CLOCK.

DISCHARGE AIR TEMPERATURE

NOT DISPLAYED WHEN CHECK

KEY IS PRESSED.

PC8900 IS NOT CONFIGURED FOR

DISCHARGE AIR TEMPERATURE.

•

RECONFIGURE PC8900 FOR DISCHARGE AIR TEMPERATURE.

POWER OUTAGE HAS REMOVED

DISCHARGE AIR TEMPERATURE

FROM DISPLAY.

• ENTER INSTALLER SET UP MODE FOR A FEW SECONDS.

AFTER LEAVING SET UP MODE, DISCHARGE AIR

TEMPERATURE IS DISPLAYED UNTIL NEXT POWER OUTAGE.

M18744

Fig. 41. Troubleshooting procedures (Continued).

68-0173—3

PROGRAM

GLOSSARY

The times, temperatures, fan and ventilation settings you

choose to define the comfort periods (WAKE, RETURN) and

energy savings periods (LEAVE, SLEEP) for each daily

schedule.

ADAPTIVE INTELLIGENT RECOVERY™ SETTING

The time when the PC8900A operates the heating or cooling

equipment to return the house from the energy savings to the

comfort temperature. The PC8900A starts the recovery period

earlier than the WAKE or RETURN period so the house will be

at the comfort setting by your chosen time.

SETBACK

Reducing the temperature in the house for a set period every

day in winter for energy savings. The lower temperature is the

energy savings temperature.

CHECK LIGHT (RED)

This light glows as a prompt to examine messages in the

CHECK LIST section.

SETUP

Raising the temperature in the house for a set period every

day in summer for energy savings. The higher temperature is

the energy savings temperature.

COMFORT TEMPERATURE

The temperature you want in the morning when you get up

(

WAKE period) and in the evening when you’re home

SETPOINT

(RETURN period).

The temperature, humidity or frost setting you program on the

PC8900A. The PC8900A turns the appropriate equipment on

and off to maintain this setting until another setting goes into

effect.

CONVENTIONAL RECOVERY SETTING

The time when the PC8900A starts operating the heating and

cooling equipment to reach the set temperature from the

energy savings temperature (LEAVE, SLEEP) to the comfort

temperature (WAKE, RETURN).

SYSTEM LIGHT (YELLOW)

On the PC8900A, this lights glows when there is a call for

heating or cooling.

DAILY PROGRAM SCHEDULE

The schedule of WAKE, LEAVE, RETURN and SLEEP period

start times, temperatures, fan and ventilation that you program

to run for each individual day.

TIME PERIOD

One of four program periods: WAKE, LEAVE, RETURN and

SLEEP available with the PC8900A. One period begins when

the previous period ends.

ENERGY-SAVING TEMPERATURE

WAKE—The time period when you want the house at a

comfortable temperature while the family gets up and gets

ready to leave for work and school.

LEAVE—The time period when you can set back (winter)

or set up (summer) the temperature for energy savings

because the family is usually away from home.

RETURN—The time period when you want the house at a

comfortable temperature for family activities in the evening

before bedtime.

SLEEP—The time period when you can set back (winter)

or set up (summer) the temperature for energy savings

because the family is sleeping. Set it to start at your family’s

normal bedtime. Often, energy savings are set only in

winter so family members can sleep cool in summer.

The lower (heating) or higher (cooling) temperature that lets

you save on heating and cooling costs when you’re asleep or

away. Also called the setback (winter) or setup (summer)

temperature.

OUTDOOR TEMPERATURE

In systems with an outdoor sensor, the temperature reading at

the sensor. Reading is available by pressing the CHECK key

until the display shows OUT and the temperature.

SELECT PERIOD KEY

Key that starts the program mode. It also lets you choose

WAKE, LEAVE, RETURN or SLEEP period to review or

program.

PREPROGRAMMED SCHEDULE

The schedule programmed into your PC8900A at the factory.

It sets a night program that provides energy savings if you

don’t set your own program, or if your personal program is lost

for any reason. The program, which is the same for all days of

the week, is:

Heating

Temp

Cooling

Temp

Fan

Setting

Vent

Setting

Period

Start Time

Saturday

WAKE (6:00 AM)

LEAVE (8:00 AM)

RETURN (6:00 PM)

(70°F)

(62°F)

(70°F)

(78°F)

(85°F)

(78°F)

(82°F)

(AUTO)

(OFF)

SLEEP (10:00 PM) (62°F)

Home and Building ControlHome and Building Control Honeywell Asia Pacific Inc.Honeywell Europe S.A.Honeywell Latin American

Honeywell

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Golden Valley, MN 55422

Honeywell Limited-Honeywell Limitée Room 3213-3225

3 Avenue du Bourget

1140 Brussels

Belgium

Region

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Suite 200

Sunrise FL 33325

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Scarborough, Ontario

M1V 4Z9

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No. 30 Harbour Road

Wanchai

Hong Kong

8-0173—3 J.H. Rev. 04-01