Honeywell Chronotherm Iii T8611G Users Manual 69 0348 T8611G,R Fuel Saver Thermostats

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

T8611G,R

Chronotherm III

Fuel Saver Thermostats

TABLE 1—Thermostat Models.

Thermostat Stages Switching LEDs Changeover Terminals Comments See Fig.

Heat Cool System Fan

T8611G 2 1 EM.HEAT- ON- EM.HT, Auto R, C/X, L, — 4

HEAT-OFF- AUTO AUX.HT. W2,E,G,O,

AUTO-COOL B,Y,X2,X1

T8611R 2 1 EM.HEAT- ON- EM.HT., Manual R,C/X,L, — 5

HEAT-OFF- AUTO AUX.HT. W2,E,W1,G,

COOL O,B,Y,P

21EM.HEAT- ON- EM.HT. Manual R,B,X,W2,Exact 6

HEAT-OFF- AUTO E,W1,G,O, replacement

COOL H,Y1for York

model no.

2ET11700224.

Installation

WHEN INSTALLING THIS PRODUCT...

1. Read these instructions carefully. Failure to allow

them could damage the product or cause a hazardous condi-

tion.

2. Check the ratings on the product to make sure the

product is suitable for your application.

3. Installer must be a trained, experienced service techni-

cian.

4. Allow thermostat to warm to room temperature before

operating.

5. After installation is complete, check out product op-

eration as provided in these instructions.

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.

LOCATION

Install thermostat and subbase about 5 ft. [1.5m] above the

floor in an area with good air circulation at room temperature.

Do not install the thermostat where it may be affected

!

Application

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-

TEM LED lights when the thermostat is signaling for heating

or air conditioning. The ENGR SAV LED lights during the

LEAVE and SLEEP periods.

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

near the bottom center of the subbase. See Table 1. The AUX.

HT. LED lights whenever the thermostat is calling for

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

iary) heat is more expensive to operate than the heat pump and

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.

TRADELINE

2

by—

—drafts or dead spots behind doors, in corners or under

cabinets.

—hot or cold air from ducts.

—radiant heat from sun or appliances

—concealed pipes and chimneys.

—unheated (uncooled) areas behind the thermostat, such

as an outside wall.

IF REPLACING AN EXISTING THERMOSTAT

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

two-transformer system may require turning off two switches

or disconnects. Remove any existing wallplate or subbase

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

letter or number on the wiring terminal as the wire is removed,

to avoid miswiring later.

IF NEW INSTALLATION

Run a cable to a hole at the selected wall location, and pull

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

coded, 8-gauge thermostat cable with one conductor for each

wiring terminal is recommended. Good service practice

recommends selecting cable with one or two more conduc-

tors than the immediate application requires.

MOUNTING SUBBASE

The subbase does not require leveling for proper opera-

tion, but for appearance only.

Remove thermostat from subbase, see Fig. 1.

The subbase mounts directly onto the wall with the screws

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.

Thread wires through the center opening of the subbase. Then

mount the subbase using two screws provided. Gently tighten

screws level top surface of subbase, then securely tighten

screws.

Fig. 1—Removing thermostat from subbase.

WIRING

All wiring must comply with local electrical codes and

ordinances.

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. 3—Keep wiring restricted to ribbed area

surrounding terminals.

Fig. 2—Mounting subbase on wall.

AUX. HEAT

EM. HT.

ONAUTO

FAN

M5179A

CHECK

HEAT OFF AUTO COOL

SYSTEM

WIRES THROUGH

WALL OPENING

WALL

WALL

ANCHORS

(2)

SUBBASE

MOUNTING

HOLES

MOUNTING

SCREWS (2)

M5175

FOR STRAIGHT INSERTION –

STRIP 5/16 in. [8 mm]

FOR WRAPAROUND –

STRIP 7/16 in. [11 mm]

RESTRICT

WIRING TO

THIS AREA

WIRING TO BE BELOW

THIS SURFACE

TOP SURFACE

OF SUBBASE

FRONT VIEW OF

TERMINAL AREA

CROSS-SECTIONAL VIEW OF

TERMINAL AREA

M3062

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

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

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

POSSIBLE CHECK LED CIRCUITS:

M 6020

MONITOR

AUXILIARY

HEAT RELAY

HEAT 2

L1

(HOT) L2

HEAT

OFF

AUTO

SYSTEM

SWITCH

AUTO

ON

FAN

SWITCH

1

EMERGENCY

HEAT RELAY

FAN RELAY

CHANGEOVER

RELAY (HEAT)

COMPRESSOR

CONTACTOR

EM. HT.

CHANGEOVER

RELAY (COOL)

AUX. HEAT

LED (GRN)

EM. HEAT

LED (RED)

HEAT 1

THERMOSTAT

LOGIC

CIRCUIT

SUBBASE

LOGIC/

CONTROL

CIRCUIT

R

C/X

L

W2

E

X2

G

O

B

Y

POWER

SUPPLY HIGH

LIMIT

HIGH

LIMIT

X1

2

1

2

3

COOL

C.O.

C.O.

COOL

CHECK LED

(YELLOW)

CHECK

LED

(YELLOW)

FAULT DETECTION

SWITCH

SWITCH TO R (POWER) SIDE OF

SYSTEM TRANSFORMER

TO R

TO C/X

CHECK

LED

(YELLOW)

FAULT DETECTION

SWITCH

SWITCH TO C (COMMON) SIDE

OF SYSTEM TRANSFORMER

TO R

TO C/X

CHECK

LED

(YELLOW)

SWITCHING

DEVICE

SWITCH IN SECONDARY OF

SEPARATE TRANSFORMER

L1

(HOT)

L2

24 Vac

1

X1

X2

X1

X2

X1

X2

3

369-0348—1

4

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

M 6019

MONITOR

AUXILIARY

HEAT RELAY

HEAT 2

L1

(HOT) L2

HEAT

OFF

COOL

SYSTEM

SWITCH

AUTO

ON

FAN

SWITCH

1

STAGE 1

HEAT RELAY

EMERGENCY

HEAT RELAY

FAN RELAY

CHANGEOVER

RELAY (HEAT)

COMPRESSOR

CONTACTOR

DEFROST

CONTROL

EM. HT.

COOL

CHANGEOVER

RELAY (COOL)

AUX. HEAT

LED (GRN)

EM. HEAT

LED (RED)

HEAT 1

THERMOSTAT

LOGIC

CIRCUIT

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.

SUBBASE

LOGIC/

CONTROL

CIRCUIT

R

C/X

L

W2

E

W1

G

O

B

Y1

POWER

SUPPLY HIGH

LIMIT

HIGH

LIMIT

P

2

3

1

2

3

569-0348—1

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

MONITOR

AUXILIARY

HEAT RELAY

HEAT 2

L1

(HOT)

L2

HEAT

OFF

AUTO

SYSTEM

SWITCH

AUTO

ON

FAN

SWITCH

1

STAGE 1

HEAT RELAY

EMERGENCY

HEAT RELAY

FAN RELAY

CHANGEOVER

RELAY (HEAT)

COMPRESSOR

CONTACTOR

EM. HT.

COOL

CHANGEOVER

RELAY (COOL)

EM. HEAT

LED (RED)

HEAT 1

THERMOSTAT

LOGIC

CIRCUIT

SUBBASE

LOGIC/

CONTROL

CIRCUIT

R

B

X

W2

E

W1

G

O

H

Y1

TRANSFORMER

POWER

SUPPLY HIGH

LIMIT

HIGH

LIMIT

2

3

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.

REMOVE JUMPER FOR SYSTEM WITH ISOLATED EMERGENCY HEAT.

TRANSFORMER COMMON IS CONNECTED TO B TERMINAL.

1

2

3

4

5

4

5

M3206

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.

Fig. 8—Battery placement.Fig. 7—Cycle rate adjustment.

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.

NOTE: Most applications will not require a change in

cycle rate.

The room air temperature will normally vary slightly from

the comfort temperature setting with the cycling of the heat

pump or auxiliary heater.

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

pumps. The heat pump compressor cycle rate can be adjusted

by turning the cycle rate adjustment screw located on the back

of the thermostat, see Fig. 7.

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.

Without battery backup, the program will remain about 20

seconds in event of power loss. When batteries are first

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

BATTERY PLACEMENT

(NOTE CORRECT PLUS

AND MINUS DIRECTION)

M372A

Fig. 9—Mounting the thermostat on subbase.

When the batteries are low, the display will flash REPL

BAT. Homeowner will have 20-30 seconds to replace batter-

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.

MOUNTING THE THERMOSTAT

With system switch set to OFF, hang the thermostat on the

tabs at the top of the subbase (Fig. 9A). Swing down and press

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

room temperature. It will go off for a few seconds, then begin

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

6

AHEAD

BACK

SET

PRESENT

DAY/TIME

DAY

Press .

Press to set the current day. Each press of the

DAY key advances the display one day.

Press TIME or 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.

—check voltage between R and C/X; it should be 20 to 30

Vac. Checkout

CAUTION

During cold weather, some heat pumps will require

that crankcase heater be energized several hours

before operating heat pump. Refer to manufacturer’s

recommendations.

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

10° F [6° C] above room temperature. Heating should start

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

5-10 minutes before heat turns on). Press COOLER key until

the setting is about 10° F [6° C] below room temperature. 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.

COOLING

CAUTION

Do not operate cooling if outdoor temperature is

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

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.

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.

FAN

Move the system switch to OFF, and the fan switch to ON.

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

the AUTO position, fan cycles with the heating or cooling

system.

INSTALLER SELF-TEST (OPTIONAL)

NOTE: Thermostat must have AC power to perform self-

test.

769-0348—1

mask no. and

System Press Look for this

Switch This Response

Position Key Key Down Key Released

OFF 03 Blank

07 Blank

15 Blank

COOL or 15 Cooling, fan and

15 Cooling, fan and

OFF 06 Blank

02 Blank

05 Blank

04 Blank

01 Blank

00 Blank

12 See note A

OFF 08 Blank

13 Microprocessor

09 Blank

14 Blank

HEAT or 14

14

14

14

OFF 10 Blank

11

END SELF-TEST

AHEAT 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.

AUTO (with

fan in AUTO)

CHANGE

TO LAST

PERIOD

SKIP

NEXT

PERIOD

PRESENT

SETTING

PRESENT

SETTING

PRESENT

SETTING

WARMER

COOLER

AHEAD

BACK

LEAVE

RETURN

WAKE

SLEEP

DAY

SET

HEAT/COOL

SET

PRESENT

DAY/TIME

SYSTEM LED on.

SYSTEM LED off.

revision no.

1st stage heating,

fan and SYSTEM

LED on.

AUTO

(with fan

in AUTO) 2nd stage heating

and AUX. HEAT

LED also on.

2nd stage heating

and AUX. HEAT

LED off.

1st stage heating,

fan and SYSTEM

LED off.

Normal operating

display.

SET

PRESENT

DAY/TIME

SET

PRESENT

DAY/TIME

HOLD

TEMP

SET

PRESENT

DAY/TIME

SET

PRESENT

DAY/TIME

RUN

PROGRAM

(CHECK

EACH

POSITION)

Perform the following test as a check of all thermostat

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

mostat must be replaced.

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

While holding keys down, all segments of the display should

be on, see Fig. 10.

2. Set system switch to OFF. Press AHEAD and BACK

and PRESENT SETTING keys at the same time to enter

self-test.

Fig. 10—All segments on display.

M410C

SUN MON TUE WED THU FRI SAT COOL ON HEAT ON

WAKE LEAVE RETURN SLEEP TEMPORARY

REPL

BAT

AM

PM

SET

PT

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

listed, as key is held down and released.

Home and Building Control Home and Building Control Helping You Control Your World

Honeywell Inc. Honeywell Limited—Honeywell Limitée

1985 Douglas Drive North 740 Ellesmere Road

Golden Valley, Minnesota 55422 Scarborough, Ontario

M1P 2V9 QUALITY IS KEY

Second Clock

Digit (Hrs.) Degrees

012F

112C

424F

524C

4-DIGIT CODE EXPLANATION

Printed in TAIWAN, R.O.C.

Cycle Rate Setting

First (CPH at 50% on time,

Digit 2nd stage heat)

0 or 2 6

4 or 6 3

M 524

System

Fourth Thermostat Switch

Digit Type No. Position

0RCOOL, OFF

1GCOOL,

AUTO or

OFF

2REM.HT.

or HEAT

3GAUTO,

EM.HT. or

HEAT

Refer to Owner’s Manual for programming instructions and

homeowner troubleshooting.

Third System

Digit Switch Position

0HEAT, EM.HT, or OFF

2AUTO

4COOL

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