Honeywell perfect climate comfort center control system Thermostat User Manual

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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.  
2
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  
1
1
2
2
5
9
9
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  
Copyright © 2001 Honeywell • All Rights Reserved  
68- 0173- 3  
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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.  
2
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.  
2
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.  
3
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  
Humidity  
Model  
W8900A  
W8900B  
W8900C  
System Type  
Conventional  
Heat pump  
Adjustment Adjustment Heat Adjustment Cool  
Use with  
PC8900A  
2a  
2
3
2
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yes  
yesb  
2
2
PC8900A  
PC8900A  
Conventional  
a
b
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:  
1
2
.
.
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  
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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-  
2
2
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  
2
CO Monitor with uncommitted contacts.  
2
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.  
3
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1
-1/2 (38)  
6
(
152)  
7
/8  
22)  
(
7
/8  
22)  
(
M4488  
3
-1/4 (83)  
8
-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).  
1
(
-3/16 1-13/16  
30)  
(46)  
1-3/16  
(30)  
3
(
/4  
19)  
13-1/4 (336)  
M4461  
1
-13/16  
46)  
(
Fig. 4. Dimensions for C7100A Discharge Air Sensor in in. (mm).  
4
(
-5/8  
117)  
4-5/8  
(117)  
3
(
-1/4  
83)  
1
(
-1/8  
29)  
2
-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).  
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6
(152)  
1-5/8 (41)  
3
-1/4 (83)  
4
(102)  
3
(
-3/8  
86)  
7
/8  
22)  
(
7
/8  
22)  
(
6
-3/8 (162)  
SYSTEM  
CHECK  
4
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  
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.  
7
(
-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.  
8
(
-3/4  
222)  
If you have questions, call Honeywell Inc. at  
1
5
-800-468-1502, Monday through Friday, 7:00 a.m. to  
:30 p.m., Central time.  
1
/2 (12)  
INSTALLATION  
3
(
/4  
19)  
4
-7/8 (124)  
6
6
-3/8 (163)  
-3/8 (163)  
(
4) 3/8 (5)  
When Installing this Product…  
1.  
Read these instructions carefully. Failure to follow  
instructions can damage the product or cause a  
hazardous condition.  
2
51)  
(
2.  
3.  
4.  
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).  
5
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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.  
1
.
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.  
2.  
.
3
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.  
4
.
.
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.  
5
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IMPORTANT  
Be sure to connect the C terminal to transformer  
W8900  
common.  
IN NEW INSTALLATION:  
1
2
.
.
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)  
3
.
.
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)  
4
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  
1
2
—
—
—
—
B
PC8900A Control Panel  
PC8900A Control Panel  
PC8900A Control Panel  
Heating, changeover valve  
24 Vac Transformer Common  
Carbon Dioxide Monitor  
3
4
B
C
C
CO2  
—
VNT  
G
VNT Relay  
—
G
Fan Relay  
GND  
HUM  
OUT  
Ground  
—
—
—
O
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  
O
R
R
RC  
RC  
RH  
—
F
RH  
S, S1  
See note a  
See note b  
T, T1  
W1  
P
Discharge Air Temperature Sensor  
Heating Relay  
—
W
W1  
W2  
Y
W1  
Stage 1 Heat Relay  
W2  
Stage 2 Heat Relay  
Y1  
Cooling Relay  
Y1  
Stage 1 Cool Relay  
Y1  
Y2  
1
Y2  
Stage 2 Cool Relay  
See note c  
See note c  
See note d  
none  
Fan Control (Honeywell dual fuel thermostat [T834])  
Fan Control (Honeywell dual fuel thermostat [T834])  
Filter Light  
2
X
Remote Timer Contacts  
Z
a
b
c
d
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.  
7
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Table 3. Heat Pump Applications (W8900B).  
Existing Thermostat  
Existing Thermostat  
Designations  
(Customer Specials)  
W8900B Terminal  
Designations  
Designations  
(Standard)  
Function  
PC8900A Control Panel  
1
2
—
—
—
—
W3  
B
—
—
PC8900A Control Panel  
PC8900A Control Panel  
PC8900A Control Panel  
Stage-3 heat control (strip heat)  
Heating, changeover valve  
24 Vac transformer common  
Carbon dioxide monitor  
3
—
4
—
AUXa  
B
—
—
C
C
X,B  
—
CO2  
—
E
VNT  
G
Emergency heat relay  
VNT relay  
E
—
G
K
—
Fan relay  
F
GND  
L
Ground  
—
L
—
System monitor  
L
O
Cooling, changeover valve  
24 Vac system transformer  
Remote Air Temperature Sensor  
Discharge Air Temperature Sensor  
Stage-2 heat control (compressor)  
Compressor contactor  
Compressor contactor  
Stage-1 cool control  
O
R
R
R
V
S, S1  
T, T1  
W2b  
Y1/W1c  
Y1/W1c  
Y1/W1c  
Y1/W1c  
Y2  
—
—
W2  
—
Y
—
—
H2,Y,R4  
RS  
M
Y1  
W1  
Y2  
X
C1,M  
Stage-1 heat control  
H1,R3  
Stage-2 cool control  
C2  
None  
None  
None  
None  
None  
None  
None  
Outd  
Clogged filter switch or common connection  
Defrost  
X1,X2,C  
—
—
—
—
—
T
P
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  
O
A
External temperature readout, T relay  
—
—
a
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.  
b
c
d
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WIRING DIAGRAMS  
W8900A,C Hookup Diagrams  
C7189A REMOTE AIR  
TEMPERATURE SENSOR  
W8900A,C  
CO2 MONITOR  
4
C7100 DISCHARGE AIR  
TEMPERATURE SENSOR  
CO2  
S1  
S
PC8900  
C7089A OUTDOOR AIR  
TEMPERATURE SENSOR  
T1  
1
2
3
4
T
OUT  
OUT  
1
2
7
3
FAN RELAY  
4
LED  
6
GND  
C
STAGE 2  
COOL RELAY  
1
L2  
L1  
R
2
RH  
RC  
HUM  
HUM  
VNT  
VNT  
G
(
HOT)  
STAGE 1  
COOL RELAY  
Y2  
Y1  
HEATING  
TRANSFORMER  
3
STAGE 1  
HEAT RELAY  
W1  
W2  
HUMIDIFIER  
OR DEHUMIDIFIER  
EQUIPMENT  
STAGE 2  
HEAT RELAY  
5
VENTILATION  
EQUIPMENT  
L1  
(
HOT)  
L2  
1
COOLING  
TRANSFORMER  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
JUMPER R TO RH FOR SINGLE HEAT TRANSFORMER APPLICATIONS.  
3
4
CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE  
HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER) DURING INSTALLER SETUP .  
(
W8900 ALLOWS CONNECTION OF A CO2 MONITOR WITH UNCOMMITTED CONTACTS.  
SEE VENTILATION INSTRUCTIONS FOR WIRING.  
5
6
GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.  
M4479D  
7
CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.  
Fig. 11. Hookup diagram for heating/cooling system in conventional system with multiple transformers.  
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W8900A,C  
C7189A REMOTE AIR  
CO2 MONITOR  
TEMPERATURE SENSOR  
4
C7100 DISCHARGE AIR  
TEMPERATURE SENSOR  
CO2  
S1  
S
PC8900  
C7089A OUTDOOR AIR  
TEMPERATURE SENSOR  
T1  
1
2
3
4
T
OUT  
OUT  
1
2
7
3
FAN RELAY  
4
LED  
GND  
C
STAGE 2  
6
COOL RELAY  
2
R
1
RH  
RC  
HUM  
HUM  
VNT  
VNT  
G
L2  
STAGE 1  
Y2  
Y1  
COOL RELAY  
L1  
HOT)  
(
SYSTEM  
STAGE 1  
TRANSFORMER  
W1  
W2  
HEAT RELAY  
3
HUMIDIFIER  
OR DEHUMIDIFIER  
EQUIPMENT  
STAGE 2  
HEAT RELAY  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.  
VENTILATION  
EQUIPMENT  
5
2
3
DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE  
(
HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).  
4
5
6
W8900 ALLOWS CONNECTION OF A CO2 MONITOR WITH UNCOMMITTED CONTACTS.  
SEE VENTILATION INSTRUCTIONS FOR WIRING.  
GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.  
7
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.  
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10  
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W8900A,C  
C7189A REMOTE AIR  
TEMPERATURE SENSOR  
CO2 MONITOR  
4
C7100 DISCHARGE AIR  
TEMPERATURE SENSOR  
CO2  
S1  
S
PC8900  
C7089A OUTDOOR AIR  
TEMPERATURE SENSOR  
T1  
1
2
3
4
T
OUT  
OUT  
1
2
7
3
4
LED  
GND  
C
6
FAN RELAY  
R
2
1
RH  
RC  
HUM  
HUM  
VNT  
VNT  
G
L2  
L1  
Y2  
Y1  
STAGE 1  
COOL RELAY  
(HOT)  
SYSTEM  
TRANSFORMER  
W1  
W2  
3
HUMIDIFIER OR  
DEHUMIDIFIER  
EQUIPMENT  
S8610U  
VENTILATION  
EQUIPMENT  
VENT  
DAMPER  
PLUG  
5
GND  
MV MV/PV PV (BURNER)  
24V  
GND 24V TH-W  
SENSE  
SPARK  
PILOT  
ST  
COM  
2ND  
MAIN  
VALVE  
SENSOR  
1
OPERATOR OPERATOR  
D892 VENT  
DAMPER  
LIMIT  
CONTROLLER  
DUAL VALVE COMBINATION  
GAS CONTROL  
IGNITER  
1
POWER SUPPLY. PROVIDE DISCONNECT  
MEANS AND OVERLOAD PROTECTION  
AS REQUIRED.  
PILOT  
BURNER  
GROUND  
PILOT GAS  
SUPPLY  
2
3
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).  
(
4
5
6
7
W8900 ALLOWS CONNECTION OF A CO2 MONITOR 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.  
11  
68-0173—3  
href="
C7189A REMOTE AIR  
TEMPERATURE SENSOR  
W8900A,C  
CO2 MONITOR  
4
C7100 DISCHARGE AIR  
TEMPERATURE SENSOR  
CO2  
S1  
S
PC8900  
C7089A OUTDOOR AIR  
TEMPERATURE SENSOR  
T1  
1
2
3
4
T
OUT  
OUT  
1
2
1
0
3
4
LED  
GND  
C
9
R
2
RH  
RC  
HUM  
HUM  
VNT  
VNT  
G
Y2  
Y1  
HUMIDIFIER OR  
DEHUMIDIFIER  
EQUIPMENT  
3
W1  
W2  
VENTILATION  
EQUIPMENT  
8
7
7
7
ZONE 2 THERMOSTAT  
ZONE 3 THERMOSTAT  
ZONE 4 THERMOSTAT  
W
G
C
R
W
G
C
R
W
G
C
R
5
R8222B1067  
R8222B1067  
R8222B1067  
R8239A1052  
C
W
Y
R
G
1
L2  
2
4V  
L1  
(
HOT)  
6
6
6
ZONE 1  
VALVE  
ZONE 2  
VALVE  
ZONE 3  
VALVE  
ZONE 4  
VALVE  
1
2
3
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).  
(
4
5
6
W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.  
2
USE ONE R8239 FOR EVERY FOUR ZONES.  
USE FOR 3-WIRE ZONE VALVE OR DAMPERS.  
7
8
9
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.  
1
0
M4491D  
Fig. 14. Hookup diagram for 3-wire zone valves in Series 20 heating system with zone controls.  
68-0173—3  
12  
href="
W8900A,C  
C7189A REMOTE AIR  
TEMPERATURE SENSOR  
CO2 MONITOR  
3
C7100 DISCHARGE AIR  
TEMPERATURE SENSOR  
CO2  
S1  
S
PC8900  
C7089A OUTDOOR AIR  
TEMPERATURE SENSOR  
T1  
1
2
3
4
T
OUT  
OUT  
1
2
6
3
4
LED  
GND  
C
5
R
FAN RELAY  
L2  
L1  
RH  
RC  
HUM  
HUM  
VNT  
VNT  
G
1
Y2  
Y1  
STAGE 1  
COOL RELAY  
(HOT)  
SYSTEM  
TRANSFORMER  
W1  
W2  
HUMIDIFIER OR  
DEHUMIDIFIER  
EQUIPMENT  
2
4
VENTILATION  
EQUIPMENT  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE  
L1  
(HOT)  
T
T
L2  
(
HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).  
OIL PRIMARY  
1
3
4
5
W8900 ALLOWS CONNECTION OF A CO2 MONITOR WITH UNCOMMITTED CONTACTS.  
SEE VENTILATION INSTRUCTIONS FOR WIRING.  
GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.  
6
CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.  
M4490D  
Fig. 15. Hookup diagram in oil heating/electric cooling system (oil primary has its own transformer).  
13  
68-0173—3  
href="
W8900B Hookup Diagrams  
CO2 MONITOR  
4
W8900B  
C7189A REMOTE AIR  
TEMPERATURE SENSOR  
COMPRESSOR  
MONITOR  
C7100 DISCHARGE AIR  
TEMPERATURE SENSOR  
CO2  
S1  
S
PC8900  
C7089A OUTDOOR AIR  
TEMPERATURE SENSOR  
L
T1  
1
2
3
4
T
OUT  
OUT  
1
2
9
5
CHANGEOVER  
RELAY  
3
4
LED  
GND  
C
FAN RELAY  
8
R
O/B  
G
2
RH  
COMPRESSOR  
CONTACTOR  
6
1
L2  
Y2  
HUM  
HUM  
VNT  
VNT  
Y1/W1  
E
L1  
(HOT)  
EMERGENCY  
HEAT RELAY  
SYSTEM  
TRANSFORMER  
AUX  
W2  
1
0
AUXILIARY  
HUMIDIFIER OR  
DEHUMIDIFIER  
EQUIPMENT  
HEAT RELAY  
3
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
JUMPER R TO RH.  
2
3
VENTILATION  
EQUIPMENT  
7
DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE  
(
HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).  
4
W8900 ALLOWS CONNECTION OF A CO2 MONITOR 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.  
5
6
7
8
9
GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.  
CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.  
1
0
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  
14  
href="
CO2 MONITOR  
4
C7189A REMOTE AIR  
TEMPERATURE SENSOR  
W8900B  
COMPRESSOR  
MONITOR  
C7100 DISCHARGE AIR  
TEMPERATURE SENSOR  
CO2  
S1  
S
PC8900  
C7089A OUTDOOR AIR  
TEMPERATURE SENSOR  
L
T1  
1
2
3
4
T
OUT  
OUT  
1
2
1
0
CHANGEOVER  
RELAY  
5
3
4
LED  
GND  
C
FAN RELAY  
9
R
2
O/B  
G
1
RH  
STAGE 2  
COMPRESSOR  
L2  
Y2  
L1  
(
HUM  
HUM  
VNT  
VNT  
Y1/W1  
E
HOT)  
SYSTEM  
TRANSFORMER  
STAGE 1  
COMPRESSOR  
AUX  
W2  
HUMIDIFIER OR  
DEHUMIDIFIER  
EQUIPMENT  
3
8
6
EMERGENCY  
HEAT RELAY  
7
AUXILIARY  
HEAT RELAY  
VENTILATION  
EQUIPMENT  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
2
3
JUMPER R TO RH.  
DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE  
HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).  
(
4
5
6
W8900 ALLOWS CONNECTION OF A CO2 MONITOR WITH UNCOMMITTED CONTACTS.  
CONFIGURE PC8900 FOR CHANGEOVER IN HEATING MODE OR COOLING MODE.  
JUMPER Y2 AND W2 TERMINALS.  
7
IF NO EMERGENCY HEAT RELAY, FIELD INSTALL JUMPER E TO AUX.  
SEE VENTILATION INSTRUCTIONS FOR WIRING.  
8
9
GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.  
CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.  
M4485D  
10  
Fig. 17. Hookup diagram of 3-stage heat/2-stage cool heat pump system.  
15  
68-0173—3  
href="
CO2 MONITOR  
4
C7189A REMOTE AIR  
TEMPERATURE SENSOR  
W8900B  
COMPRESSOR  
MONITOR  
C7100 DISCHARGE AIR  
TEMPERATURE SENSOR  
CO2  
L
S1  
S
PC8900  
C7089A OUTDOOR AIR  
TEMPERATURE SENSOR  
T1  
1
2
3
4
T
OUT  
OUT  
1
2
9
3
4
LED  
GND  
C
8
R8222N1011  
5
R
O/B  
G
2
1
RH  
L2  
Y2  
STAGE 1 HEAT RELAY  
1
3
2
L1  
HUM  
HUM  
VNT  
VNT  
Y1/W1  
E
(
HOT)  
SYSTEM  
TRANSFORMER  
AUX  
W2  
6
STAGE 1 COOL RELAY  
3
HUMIDIFIER OR  
DEHUMIDIFIER  
EQUIPMENT  
HEAT  
CHANGEOVER VALVE  
4
6
VENTILATION  
EQUIPMENT  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
JUMPER R TO RH.  
7
3
DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE  
(
HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).  
4
5
W8900 ALLOWS CONNECTION OF A CO2 MONITOR WITH UNCOMMITTED CONTACTS.  
CONNECT HEATING CHANGEOVER VALVE TO R8222N1011 AND CONFIGURE PC8900 FOR  
CHANGEOVER IN HEATING MODE.  
6
CONNECT G, Y2, E, AUX, AND W2 TERMINALS AS REQUIRED.  
SEE VENTILATION INSTRUCTIONS FOR WIRING.  
7
8
GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.  
CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.  
9
M4486D  
Fig. 18. Hookup diagram for heat pump application requiring separate W1 and Y1 terminals with heating changeover.  
68-0173—3  
16  
href="
CO2 MONITOR  
4
C7189A REMOTE AIR  
TEMPERATURE SENSOR  
W8900B  
COMPRESSOR  
MONITOR  
C7100 DISCHARGE AIR  
TEMPERATURE SENSOR  
CO2  
L
S1  
S
PC8900  
C7089A OUTDOOR AIR  
TEMPERATURE SENSOR  
T1  
1
2
3
4
T
OUT  
OUT  
1
2
9
3
4
LED  
GND  
C
8
R8222N1011  
5
R
O/B  
G
2
1
RH  
L2  
Y2  
STAGE 1 COOL RELAY  
1
3
2
L1  
HUM  
HUM  
VNT  
VNT  
Y1/W1  
E
(
HOT)  
SYSTEM  
TRANSFORMER  
AUX  
W2  
6
STAGE 1 HEAT RELAY  
HUMIDIFIER OR  
3
DEHUMIDIFIER  
EQUIPMENT  
COOL  
CHANGEOVER VALVE  
4
6
7
VENTILATION  
EQUIPMENT  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
JUMPER R TO RH.  
3
DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE  
(
HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).  
4
5
W8900 ALLOWS CONNECTION OF A CO2 MONITOR WITH UNCOMMITTED CONTACTS.  
CONNECT COOLING CHANGEOVER VALVE TO R8222N1011 AND CONFIGURE PC8900 FOR  
CHANGEOVER IN COOLING MODE.  
6
7
8
9
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.  
17  
68-0173—3  
href="
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.  
C
R
L2  
2
L1  
(
•
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)  
RH  
RC  
G
FAN  
Y2  
Y1  
1
3
R8222N1011 HUM  
COMP  
HUM  
VNT  
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:  
W1  
W2  
1
4
3
6
—
Hot or cold areas caused by concealed pipes or ducts.  
1
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  
2
3
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.  
2.  
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  
C
L2  
2
R
L1  
(
HOT)  
RH  
RC  
G
NOTE: If the old thermostat leaves marks on the wall that  
the PC8900A does not cover, order part no.  
1
Y2  
Y1  
HUM  
HUM  
VNT  
VNT  
L2  
L1  
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)  
W1  
W2  
3
4
1
WALL  
WIRES  
THROUGH WALL  
WALL  
ANCHORS  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
(
3)  
2
3
4
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)  
1
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)  
1
USE THREE MOUNTING HOLES THAT BEST  
FIT APPLICATION  
M4466  
Fig. 22. Mounting PC8900A Wiring Plate.  
68-0173—3  
18  
href="
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.  
4
5
.
.
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.  
6.  
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  
1
WALL  
ANCHORS  
MOUNTING  
SCREWS (3)  
(
3)  
EM  
SYST  
CHECK  
PC8900  
COMFORT  
CENTER  
CONTROL  
PANEL  
1
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.  
19  
68-0173—3  
href="
2.  
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.  
1
8-gauge thermostat wire is recommended.  
W8900  
All wiring must comply with all applicable electrical codes,  
ordinances and regulations.  
1.  
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.  
1
2
1
2
3
.
.
Tighten screw terminals securely.  
3
Push the excess wire back into the hole. Plug the hole  
with nonhardening caulk, putty or insulation to prevent  
drafts from affecting PC8900A operation.  
2
4
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.  
4
3
•
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):  
•
•
1
2
1
2
3
4
—
—
Hot or cold areas caused by concealed pipes or ducts.  
Drafts from windows, doors, fireplaces or other heat/  
cool sources.  
1
2
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.  
—
—
3
4
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  
1.  
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  
20  
href="
YES  
NO  
NO  
5
FEET  
1.5 METERS)  
(
NO  
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.  
1
.
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.  
2.  
3
4
.
.
Mount the C7189A on the wall or junction box using the  
screws and anchors provided.  
IMPORTANT  
Erratic temperature readings from a sensor can  
5
.
.
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.  
6
—
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.  
21  
68-0173—3  
href="
W8900  
2
3
S1  
S
C7189  
LED  
GND  
C
R
RH  
RC  
L1  
(
HOT)  
L2  
1
1
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  
2
3
W8900  
4
S1  
S
S1  
S
C7189  
C7189  
C7189  
C7189  
C7189  
C7189  
C7189  
C7189  
C7189  
C7189  
C7189  
C7189  
C7189  
4
4
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  
22  
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—
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.  
1
WIRING HOLE  
THROUGH  
STRUCTURE  
C7089  
2
Mounting  
1
2
.
.
Remove the sensor from the mounting clip.  
Mark the area on the surface where the C7089A mount-  
ing clip will be mounted.  
3.  
Mount the clip.  
W8900  
3
OUT  
OUT  
LED  
GND  
1
USE APPROPRIATE MOUNTING MEANS FOR THE TYPE  
OF STRUCTURE.  
2
3
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.  
23  
68-0173—3  
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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.  
1
.
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.  
2.  
.
3
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:  
1.  
2.  
3.  
4.  
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:  
1.  
Cut a 7/8 in. (22 mm) hole in the duct or plenum surface  
at the desired location.  
2
.
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  
3
.
.
IMPORTANT  
Installer setup must be done for the HVAC equip-  
ment and the PC8900A/W8900A-C to operate  
properly.  
4
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  
24  
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TO ENTER THE INSTALLER SETUP MODE:  
System Options  
1.  
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.  
2.  
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  
AM  
PM  
AUTO  
ON  
CIRC  
TO CHANGE TO ANOTHER SELECTION:  
SUN MON TUE WED THU FRI SAT WAKELEAVERETURNSLEEP TEMPORARY VENT  
1.  
Press the up or down arrowhead key until the desired  
segment is flashing.  
M6360  
2
.
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.  
3.  
Table 4. System Setting Options  
Other Choices (Press  
Up or Down Arrowhead  
Keys to Change)  
Factory-Setting  
Description  
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.  
a
M6370  
M6385  
25  
68-0173—3  
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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.  
a
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).  
a
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  
1
1
ONE OF THESE SEGMENTS WILL BE FLASHING.  
M6401  
Fig. 30. Initial display for installer setup.  
Table 5. Heating Cycle Rates.  
Display Shows  
Stage 2a  
AUX HT  
W2 CPH 6b AUX HT CPH 6b EM. HT. CPH 6b  
Cycles per  
Hour Setting  
System  
Stage 1  
W1 CPH 6b  
W1 CPH 9  
EM. HT.  
Gas or Oil Forced Air  
Electric Heat  
6
9
3
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  
1
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/Ac  
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  
2
2
1
.5  
AUX HT CPH 2  
EM. HT. CPH 2  
.5  
W1 CPH 1.5  
W2 CPH 1.5  
AUX HT CPH 1.5 EM. HT. CPH 1.5  
a
b
c
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  
26  
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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  
3
Y1 CPH 3  
(factory  
setting)  
Y2 CPH 3  
(factory  
setting)  
N/Aa  
N/Aa  
9
6
1
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  
5
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/Aa  
N/Aa  
N/Aa  
4.5  
2.5  
2
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  
a
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  
Description  
a
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  
a
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.  
2.  
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)  
(AUTO) (OFF)  
(AUTO) (OFF)  
(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.  
4.  
Press RUN to exit the SET CLOCK program mode.  
27  
68-0173—3  
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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.  
CHECK  
HEAT SET PT COOL  
FAN  
AUTO  
CLOCK  
SET  
HEAT OFF COOL  
SYSTEM  
DAY  
AUTO ON CIRC  
FAN  
SETPOINTS  
HEAT/COOL  
SP EE LR  
E
IO  
C
DT  
HUMIDITY  
TIME  
TIME  
VENTILATE  
HOLD  
CANCEL  
RUN  
M6210  
f. Press HEAT/COOL SETPOINTS to switch to COOL  
SET PT.  
Setting a Customized Program  
SYSTEM  
HEAT  
COOL SET PT  
FAN  
AUTO  
HEAT/COOL  
SETPOINTS  
C LS OE CT K  
HEA  
S
Y
T
S
OF  
T
F
E
COOL  
M
DAY  
AUTO  
F
A
ON  
N
CIRC  
HS E AT PT /OC I ON OT SL  
Planning your Program  
PERIOD  
SELECT  
HUMIDITY  
TIME  
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  
S
Y
T
S
OF  
T
F
E
COOL  
M
DAY  
AUTO  
F
A
ON  
N
CIRC  
HS E AT PT /OC I ON OT SL  
SP EE LR E  
IO  
C
DT  
HUMIDITY  
TIME  
TIME  
VENTILATE  
HOLD  
RUN  
CANCEL  
M6232  
1
. 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 LSE CT K  
HEA  
S
Y
T
S
OF  
T
F
E
COOL  
M
DAY  
AUT  
F
O
A
ON  
N
CIRC  
HS E AT PT /OC I ON TO SL  
PERIOD  
SP EE LR  
E
IO  
C
DT  
HUMIDITY  
TIME  
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  
 S OE CT K  
HEA  
S
Y
T
S
OF  
T
F
E
COOL  
M
DAY  
AUT  
F
O
A
ON  
N
CIRC  
HS E AT PT /OC I ON OT SL  
SP LR  
E
IO  
C
DT  
HUMIDITY  
TIME  
TIME  
VENTILATE  
HOLD  
RUN  
CANCEL  
M6205  
2
. 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  
CL CT K  
HEA  
S
Y
T
S
OF  
T
F
E
COOL  
M
DAY  
AUT  
F
O
A
ON  
N
CIRC  
HS E AT PT /OC I ON TO SL  
SP EE LR  
E
IO  
C
DT  
HUMIDITY  
TIME  
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  
S
Y
T
S
OF  
T
F
COOL  
EM  
DAY  
AUT  
F
O
A
ON  
N
CIRC  
HS E AT PT /OC I ON OT SL  
DAY  
SP EE LR  
E
IO  
C
DT  
HUMIDITY  
TIME  
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  
HEAT SET PT  
COOL  
FAN  
AUTO  
HEAT/COOL  
SETPOINTS  
C LS OE CT K  
HEA  
S
Y
T
S
OF  
T
F
E
CO  
M
OL  
DAY  
AUTO  
F
A
ON  
N
CIRC  
HS EE AT PT /OC I ON OT SL  
AUTO ON CIRC  
SP EE LR  
E
IO  
C
DT  
HUMIDITY  
TIME  
TIME  
VENTILATE  
HOLD  
RUN  
C LS OE CT K  
HEA  
S
Y
T
S
OF  
T
F
E
COOL  
M
DAY  
AUT  
F
O
A
ON  
N
CIRC  
HS E AT PT /OC I ON TO SL  
CANCEL  
WAKE  
PERIOD  
SELECT  
HUMIDITY  
TIME  
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  
AM  
TIME  
C LS OE CT K  
HEA  
S
Y
T
S
OF  
T
F
E
CO
M
DAY  
AUT  
F
O
A
ON  
N
CIRC  
HS E AT PT /OC I ON OT SL  
TIME  
SP EE LR E  
IO  
C
DT  
HUMIDITY  
VENTILATE  
HOLD  
RUN  
TIME  
TIME  
MON  
CANCEL  
M6215  
68-0173—3  
28  
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c. Press and hold SELECT PERIOD until the desired  
period is displayed.  
4
. Setting Ventilator  
a. Press VENTILATE to display VENT when increased  
ventilation is desired during the WAKE period.  
SYSTEM  
HEAT SET PT COOL  
CHECK  
AM  
SELECT  
SYSTEM  
HEAT  
COOL SET PT  
FAN  
C LSE CT K  
HEA  
S
Y
T
S
OF  
T
F
E
CO  
M
OL  
DAY  
AUTO  
F
A
ON  
N
CIRC  
HS EE AT PT /OC I ON OT SL  
CHECK  
PERIOD  
SP EE LR  
E
IO  
C
DT  
HUMIDITY  
TIME  
TIME  
VENTILATE  
HOLD  
RUN  
AUTO  
SAT  
LEAVE  
FAN  
CANCEL  
C LS OE CT K  
HEA  
S
Y
T
S
OF  
T
F
E
CO  
M
OL  
DAY  
AUT  
F
O
A
ON  
N
CIRC  
HS EE AT PT /OC I ON OT SL  
M6236  
AUTO ON CIRC  
SP EE LR  
E
IO  
C
DT  
HUMIDITY  
TIME  
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  
S
Y
T
S
OF  
T
F
E
CO  
M
OL  
DAY  
AUTO  
F
A
ON  
N
CIRC  
HS EE AT POC I ON TO L  
S
CHECK  
HEAT  
COOL SET PT  
FAN  
SP EE LR  
E
IO  
C
DT  
HUMIDITY  
TIME  
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  
E
IO  
C
DT  
HUMIDITY  
TIME  
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  
AM  
TIME  
SLEEP  
CLOCK  
SET  
SYSTEM  
AUTO ON CIRC  
FAN  
SETPOINTS  
HEAT/COOL  
HEAT OFF COO
DAY  
TIME  
SP EE LR  
E
IO  
C
DT  
HUMIDITY  
VENTILATE  
HOLD  
TIME  
TIME  
SAT  
LEAVE  
CANCEL  
RUN  
a. Repeat steps 2a through 4b for each period to be