Honeywell T8611G Thermostat User Manual

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TRADELINE

T8611G,R

Chronotherm III

Fuel Saver Thermostats

The AUX. HT., EM. HT., and CHECK LEDS are located

Application

nearthebottomcenterofthesubbase.SeeTable1.TheAUX.

HT. LED lights whenever the thermostat is calling for

operation of the backup or auxiliary heater. Backup (auxil-

iary)heatismoreexpensivetooperatethantheheatpumpand

typically is used only when the heat pump is unable to handle

the load. The EM. HT. LED lights whenever the thermostat

system switch is in the EM. HT. position. The CHECK LED

lights when something needs to be checked to maintain

efficient operation of the system. Consult heat pump equip-

ment literature to determine specific meaning of this LED.

Heat and cool anticipation is fixed in all models; no

adjustment is necessary. Cycle rates are adjustable for auxil-

iary heating stage.

These thermostats provide energy saving control for a 24

Vac multistage heat pump heating/cooling system as indi-

cated in Table 1 and are powered directly from the control

transformer. All models have 5-1-1 programming.

As long as AC power is continuously available to trans-

former, the thermostat will be compatible with most control

systems.

The T8611G,R models include SYSTEM and ENRG

SAV LEDs near the top front of the thermostat. The SYS-

TEMLEDlightswhenthethermostatissignalingforheating

or air conditioning. The ENGR SAV LED lights during the

LEAVE and SLEEP periods.

TABLE 1—Thermostat Models.

Thermostat

T8611G

Stages

Switching

System

EM.HEAT-

HEAT-OFF-

AUTO-COOL

EM.HEAT-

HEAT-OFF-

COOL

LEDs

Changeover

Terminals

R, C/X, L,

Comments

See Fig.

Heat Cool

Fan

ON-

AUTO

EM.HT,

AUX.HT.

Auto

—

W ,E,G,O,

B,Y,X2,X1

R,C/X,L,

T8611R

ON-

AUTO

EM.HT.,

AUX.HT.

Manual

—

W ,E,W ,G,

2 1

O,B,Y,P

R,B,X,W ,

EM.HEAT-

HEAT-OFF-

COOL

ON-

AUTO

EM.HT.

Exact

E,W ,G,O,

replacement

for York

model no.

H,Y

2ET11700224.

Installation

CAUTION

1. Disconnect power supply to prevent electri-

cal shock or equipment damage.

2. After wiring is complete, push excess wire

back into the hole, and plug hole with

nonhardening caulk, putty or insulation to

prevent drafts from affecting thermostat op-

eration.

WHEN INSTALLING THIS PRODUCT...

. Read these instructions carefully. Failure to allow

them could damage the product or cause a hazardous condi-

tion.

. Check the ratings on the product to make sure the

product is suitable for your application.

. Installermustbeatrained, experiencedservicetechni-

cian.

. Allow thermostat to warm to room temperature before

LOCATION

operating.

Installthermostatandsubbaseabout5ft.[1.5m]abovethe

floorinanareawithgoodaircirculationatroomtemperature.

Do not install the thermostat where it may be affected

. After installation is complete, check out product op-

eration as provided in these instructions.

J.H. • 3-92 • © Honeywell Inc. 1992 • Form Number 69-0348—1

by—

—

drafts or dead spots behind doors, in corners or under

cabinets.

Fig. 2—Mounting subbase on wall.

—

hot or cold air from ducts.

WALL

radiant heat from sun or appliances

concealed pipes and chimneys.

unheated (uncooled) areas behind the thermostat, such

as an outside wall.

WIRES THROUGH

WALL OPENING

WALL

ANCHORS

(2)

IF REPLACING AN EXISTING THERMOSTAT

Turn off power to thermostat at furnace or heat pump. A

two-transformersystemmayrequireturningofftwoswitches

or disconnects. Remove any existing wallplate or subbase

from the wall. Label or write down each wire color with the

letterornumberonthewiringterminalasthewireisremoved,

to avoid miswiring later.

MOUNTING

HOLES

IF NEW INSTALLATION

Run acabletoa holeattheselectedwall location, andpull

about 3 in. [76 mm] of wire through the opening. Color-

coded, 8-gaugethermostatcablewithoneconductorforeach

wiring terminal is recommended. Good service practice

recommends selecting cable with one or two more conduc-

tors than the immediate application requires.

MOUNTING

SCREWS (2)

SUBBASE

M5175

MOUNTING SUBBASE

The subbase does not require leveling for proper opera-

tion, but for appearance only.

WIRING

All wiring must comply with local electrical codes and

ordinances.

Remove thermostat from subbase, see Fig. 1.

Thesubbasemountsdirectlyontothewallwiththescrews

included in the package. Use the subbase as a template, and

with a pencil, mark the two mounting screw positions, see

Fig. 2. Use 3/16 in. bit to drill holes for anchors. Gently tap

anchors into holes until they are flush with the wall surface.

Threadwiresthroughthecenteropeningofthesubbase.Then

mountthesubbaseusingtwoscrewsprovided.Gentlytighten

screws level top surface of subbase, then securely tighten

screws.

Disconnect power before wiring to prevent electrical

shock or equipment damage.

The shape of the terminal barrier permits insertion of

straight or conventional wraparound wiring connections.

Either method is acceptable.

Refer to Figs. 4-6 for typical hookups of subbase and

thermostat.

NOTE: Keep all wiring restricted to ribbed area surround-

ing terminals to assure thermostat/subbase contact, see

Fig. 3.

Fig. 1—Removing thermostat from subbase.

Fig. 3—Keep wiring restricted to ribbed area

surrounding terminals.

FOR STRAIGHT INSERTION –

STRIP 5/16 in. [8 mm]

SYSTEM

RESTRICT

WIRING TO

THIS AREA

FOR WRAPAROUND –

STRIP 7/16 in. [11 mm]

FRONT VIEW OF

TERMINAL AREA

^E^M^.^H^T^.^H^E^A^T^O^F^F^A^U^T^O COOL

FAN

WIRING TO BE BELOW

THIS SURFACE

TOP SURFACE

OF SUBBASE

AUTO

AUX. HEAT

CHECK

M5179A

CROSS-SECTIONAL VIEW OF

TERMINAL AREA

M3062

Fig. 4—T8611G 2-stage heat/1-stage cool thermostat.

(

HOT)

POWER

SUPPLY

HIGH

LIMIT

C/X

EM. HEAT

LED (RED)

AUX. HEAT

LED (GRN)

FAN

SWITCH

MONITOR

SUBBASE

AUTO

THERMOSTAT

LOGIC

LOGIC/

HEAT 2

AUXILIARY

CONTROL

CIRCUIT

HEAT RELAY

CIRCUIT

EMERGENCY

HEAT RELAY

SYSTEM

SWITCH

EM. HT.

HEAT

FAN RELAY

OFF

C.O.

AUTO

CHANGEOVER

RELAY (COOL)

COOL

HIGH

LIMIT

COOL

CHANGEOVER

RELAY (HEAT)

HEAT 1

COMPRESSOR

CONTACTOR

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

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

CHECK LED

(

YELLOW)

POSSIBLE CHECK LED CIRCUITS:

TO R

CHECK

LED

CHECK

LED

CHECK

LED

(HOT)

FAULT DETECTION

SWITCH

SWITCHING

DEVICE

FAULT DETECTION

(

YELLOW)

(YELLOW) SWITCH

(YELLOW)

24 Vac

TO C/X

SWITCH TO R (POWER) SIDE OF

SYSTEM TRANSFORMER

SWITCH IN SECONDARY OF

SEPARATE TRANSFORMER

M 6020

SWITCH TO C (COMMON) SIDE

OF SYSTEM TRANSFORMER

69-0348—1

Fig. 5—T8611R 2-stage heat/1-stage cool thermostat.

(

HOT)

POWER

SUPPLY

HIGH

LIMIT

C/X

EM. HEAT

LED (RED)

AUX. HEAT

LED (GRN)

FAN

SWITCH

MONITOR

SUBBASE

LOGIC/

AUTO

THERMOSTAT

LOGIC

AUXILIARY

HEAT 2

CONTROL

CIRCUIT

HEAT RELAY

CIRCUIT

EMERGENCY

HEAT RELAY

SYSTEM

SWITCH

EM. HT.

HEAT

STAGE 1

HEAT RELAY

FAN RELAY

OFF

COOL

CHANGEOVER

RELAY (COOL)

HIGH

LIMIT

CHANGEOVER

RELAY (HEAT)

HEAT 1

COOL

COMPRESSOR

CONTACTOR

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

REMOVE JUMPER FOR SYSTEM WITH ISOLATED STAGE 1 HEATING AND COOLING CONNECTIONS.

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

DEFROST

CONTROL

M 6019

Fig. 6—T8611R 2-stage heat/1-stage cool thermostat. Exact replacement for York model no. 2ET11700224.

POWER

SUPPLY

(HOT)

HIGH

LIMIT

TRANSFORMER

EM. HEAT

LED (RED)

FAN

MONITOR

SWITCH

SUBBASE

LOGIC/

THERMOSTAT

LOGIC

AUXILIARY

AUTO

CONTROL

CIRCUIT

HEAT 2

HEAT RELAY

CIRCUIT

EMERGENCY

HEAT RELAY

SYSTEM

SWITCH

EM. HT.

HEAT

STAGE 1

HEAT RELAY

FAN RELAY

OFF

AUTO

CHANGEOVER

RELAY (COOL)

HIGH

LIMIT

CHANGEOVER

RELAY (HEAT)

COOL

HEAT 1

COMPRESSOR

CONTACTOR

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

NOTE: THIS DIAGRAM IS FOR USE WHEN REPLACING ONLY YORK

THERMOSTAT MODEL NO. 2ET11700224. USING THIS

DRAWING FOR OTHER INSTALLATIONS CAN RESULT IN

DAMAGE TO THERMOSTAT.

REMOVE JUMPER FOR SYSTEM WITH ISOLATED STAGE 1 HEATING

AND COOLING CONNECTIONS.

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

REMOVE JUMPER FOR SYSTEM WITH ISOLATED EMERGENCY HEAT.

TRANSFORMER COMMON IS CONNECTED TO B TERMINAL.

M3206

Fig. 7—Cycle rate adjustment.

Fig. 8—Battery placement.

BATTERY PLACEMENT

NOTE CORRECT PLUS

AND MINUS DIRECTION) M372A

(

The cycle rate of this thermostat is factory-set for heat

pumps.Theheatpumpcompressorcycleratecanbeadjusted

byturningthecyclerateadjustmentscrewlocatedontheback

of the thermostat, see Fig. 7.

CYCLE RATE ADJUSTMENT

To custom-tailor the thermostat’s cycling performance to

different types of heating equipment, a cycle rate adjustment

screw is provided on the back of the thermostat. Correct

setting of this screw will provide optimum savings.

INSTALLING BATTERIES

Three AAA alkaline batteries are provided as backup to

prevent program loss in event of power outage. Batteries are

included with thermostat. Install batteries in back of thermo-

stat as shown in Fig. 8.

NOTE: Most applications will not require a change in

cycle rate.

Withoutbatterybackup,theprogramwillremainabout20

seconds in event of power loss. When batteries are first

installed, the display will flash 1:00 PM and 32°.

Theroomairtemperaturewillnormallyvaryslightlyfrom

the comfort temperature setting with the cycling of the heat

pump or auxiliary heater.

69-0348—1

When the batteries are low, the display will flash REPL

BAT. Homeownerwillhave20-30secondstoreplacebatter-

ies after removing batteries from thermostat. After 20-30

seconds, it will be necessary to reprogram. REPL BAT

indication will be disappear when thermostat is mounted

back on the powered subbase.

Fig. 9—Mounting the thermostat on subbase.

MOUNTING THE THERMOSTAT

WithsystemswitchsettoOFF,hangthethermostatonthe

tabsatthetopofthesubbase(Fig.9A).Swingdownandpress

on lower edge until thermostat snaps in place

(Fig. 9B). Open cover and tighten the captive mounting

screws (Fig. 9C).

SETTING DAY AND TIME

Restore 24V power to the thermostat. When power is

applied to the thermostat, the display will read 1:00 PM and

roomtemperature. Itwillgooffforafewseconds, thenbegin

to flash on and off. Set present day and time.

SET

PRESENT

DAY/TIME

Press

DAY

to set the current day. Each press of the

DAY key advances the display one day.

BACK

Press TIME AHEAD

to set the current time.

If the display will not come on.

—

check mounting of thermostat to subbase. If loose or

misaligned, remove thermostat and reinstall on the

subbase, making sure it is firmly attached.

check to see that system power is on.

checkvoltagebetweenRandC/X;itshouldbe20to30

Vac.

—

Checkout

CAUTION

Duringcoldweather, someheatpumpswillrequire

that crankcase heater be energized several hours

beforeoperatingheatpump.Refertomanufacturer’s

recommendations.

NOTE: When cooling setting is changed, thermostat will

wait up to 5 minutes before turning on the cooling equip-

ment. This delay protects the compressor.

HEATING

When heating setting is changed, thermostat will wait up

to 5 minutes before turning on the heating equipment. This

delay protects the compressor.

Move the system switch to HEAT and the fan switch to

AUTO. Press WARMER key until the setting is about

Move the system switch to COOL and the fan switch to

AUTO. Press COOLER key until the setting is about

10° F [6° C] below room temperature. The cooling equip-

ment and fan should start. Press WARMER key until the

setting is about 10° F [6° C] above room temperature. The

cooling equipment and fan should stop.

0° F [6° C] above room temperature. Heating should start

and the fan should run (there may be a delay of

-10minutesbeforeheatturnson). PressCOOLERkeyuntil

NOTE: On an AUTO changeover thermostat, the heating

temperature must be set at least 3° F [1.7° C] below the

cooling temperature, or display will flash.

thesettingisabout10°F[6°C]belowroomtemperature.The

heating equipment and fan should shut off.

NOTE: On an AUTO changeover thermostat, the cooling

temperature must be set at least 3° F [1.7° C] above the

heating temperature, or display will flash.

FAN

MovethesystemswitchtoOFF,andthefanswitchtoON.

The fan should run continuously. When the fan switch is in

the AUTO position, fan cycles with the heating or cooling

system.

COOLING

CAUTION

INSTALLER SELF-TEST (OPTIONAL)

Do not operate cooling if outdoor temperature is

below 50° F [10° C]. Refer to manufacturer’s

recommendations.

NOTE: Thermostat must have AC power to perform self-

test.

Perform the following test as a check of all thermostat

functions. If thermostat does not respond as indicated, ther-

mostat must be replaced.

System

Switch

Position

Press

This

Key

Look for this

Response

1. Press AHEAD and BACK keys at the same time.

Key Down

Key Released

While holding keys down, all segments of the display should

be on, see Fig. 10.

OFF

CHANGE

TO LAST

PERIOD

Blank

. SetsystemswitchtoOFF.PressAHEADandBACK

SKIP

PERIOD

and PRESENT SETTING keys at the same time to enter

self-test.

PRESENT

SETTING

. Press each key as listed below, and look for response

listed, as key is held down and released.

COOL or

AUTO (with

fan in AUTO)

PRESENT

SETTING

Cooling, fan and

SYSTEM LED on.

Fig. 10—All segments on display.

REPL

PRESENT

SETTING

Cooling, fan and

SYSTEM LED off.

SET

PM BAT

SUN MON TUE WED THU FRI SAT COOL ON HEAT ON

WAKE LEAVE RETURN SLEEP TEMPORARY

OFF

Blank

WARMER

COOLER

M410C

AHEAD

BACK

LEAVE

RETURN

WAKE

(CHECK

See note

Blank

EACH

POSITION)

OFF

SLEEP

Microprocessor

mask no. and

revision no.

DAY

SET

HEAT/COOL

Blank

SET

PRESENT

DAY/TIME

Blank

st stage heating,

HEAT or

AUTO

SET

PRESENT

DAY/TIME

fan and SYSTEM

LED on.

(with fan

nd stage heating

SET

PRESENT

DAY/TIME

in AUTO)

and AUX. HEAT

LED also on.

nd stage heating

SET

PRESENT

DAY/TIME

and AUX. HEAT

LED off.

st stage heating,

SET

PRESENT

DAY/TIME

fan and SYSTEM

LED off.

OFF

HOLD

TEMP

Blank

Normal operating

display.

RUN

PROGRAM

END SELF-TEST

HEAT displayed when system switch is in HEAT, COOL

when in COOL, HEAT or COOL when in AUTO, neither

when in OFF. Also, a four-digit code is displayed, with each

digit explained on the next page.

69-0348—1

-DIGIT CODE EXPLANATION

Second

Digit

Clock

(Hrs.)

Degrees

Cycle Rate Setting

(CPH at 50% on time,

2nd stage heat)

First

Digit

or 2

or 6

M 524

Third

Digit

System

Switch Position

System

Switch

Position

Fourth

Digit

Thermostat

Type No.

HEAT, EM.HT, or OFF

AUTO

COOL

COOL, OFF

COOL,

AUTO or

OFF

EM.HT.

or HEAT

AUTO,

EM.HT. or

HEAT

Refer to Owner’s Manual for programming instructions and

homeowner troubleshooting.

This equipment is a Class B digital apparatus which complies with Canadian Radio Interference Regulations, CRCc. 1374.

Home and Building Control

Honeywell Inc.

Home and Building Control

Honeywell Limited—Honeywell Limitée

740 Ellesmere Road

Helping You Control Your World

985 Douglas Drive North

Golden Valley, Minnesota 55422

Scarborough, Ontario

M1P 2V9

QUALITY IS KEY

Printed in TAIWAN, R.O.C.

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