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

2014-12-11

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T8611G,R
Chronotherm III
Fuel Saver Thermostats

TRADELINE

Application
These thermostats provide energy saving control for a 24
Vac multistage heat pump heating/cooling system as indicated 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 transformer, 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 SYSTEM 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 (auxiliary) 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 equipment 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 auxiliary heating stage.

TABLE 1—Thermostat Models.
Thermostat
T8611G

T8611R

Stages
Heat Cool
2
1

Switching
System
EM.HEATHEAT-OFFAUTO-COOL
EM.HEATHEAT-OFFCOOL
EM.HEATHEAT-OFFCOOL

LEDs

Changeover

Fan
ONAUTO

EM.HT,
AUX.HT.

Auto

ONAUTO

EM.HT.,
AUX.HT.

Manual

ONAUTO

EM.HT.

Manual

Installation
WHEN INSTALLING THIS PRODUCT...
1. Read these instructions carefully. Failure to allow
them could damage the product or cause a hazardous condition.
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 technician.
4. Allow thermostat to warm to room temperature before
operating.
5. After installation is complete, check out product operation as provided in these instructions.

Terminals
R, C/X, L,
W2,E,G,O,
B,Y,X2,X1
R,C/X,L,
W2,E,W1,G,
O,B,Y,P
R,B,X,W2,
E,W1,G,O,
H,Y1

Comments

See Fig.

—

Exact
replacement
for York
model no.
2ET11700224.

CAUTION
1. Disconnect power supply to prevent electrical 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 operation.

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

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

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.

Fig. 2—Mounting subbase on wall.

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-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.
MOUNTING
HOLES

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. Colorcoded, 8-gauge thermostat cable with one conductor for each
wiring terminal is recommended. Good service practice
recommends selecting cable with one or two more conductors than the immediate application requires.

MOUNTING
SCREWS (2)
M5175

SUBBASE

MOUNTING SUBBASE
The subbase does not require leveling for proper operation, 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.

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 surrounding 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
EM. HT. HEAT
OFF AUTO
COOL

WIRING TO BE BELOW
THIS SURFACE

FAN
ON

AUX. HEAT

AUTO

TOP SURFACE
OF SUBBASE

CHECK

M5179A

CROSS-SECTIONAL VIEW OF
TERMINAL AREA

M3062

Fig. 4—T8611G 2-stage heat/1-stage cool thermostat.
1
L1
L2
(HOT)
2
R
POWER
SUPPLY

HIGH
LIMIT
C/X
EM. HEAT
LED (RED)

AUX. HEAT
LED (GRN)
L

FAN
SWITCH

MONITOR

ON
W2

SUBBASE
LOGIC/
CONTROL
CIRCUIT

THERMOSTAT
LOGIC
CIRCUIT

AUTO

HEAT 2

AUXILIARY
HEAT RELAY
E
EMERGENCY
HEAT RELAY

SYSTEM
SWITCH
EM. HT.
G

HEAT

FAN RELAY
OFF

C.O.
O

AUTO
COOL
HIGH
LIMIT

CHANGEOVER
RELAY (COOL)

C.O.
B

CHANGEOVER
RELAY (HEAT)

COOL

HEAT 1

Y
COMPRESSOR
CONTACTOR
1
2
3

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

X1
CHECK LED
(YELLOW)

POSSIBLE CHECK LED CIRCUITS:

X1
CHECK
LED
(YELLOW)
X2

TO R

FAULT DETECTION
SWITCH

CHECK
LED
(YELLOW)

FAULT DETECTION
SWITCH

TO C/X

SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER

TO C/X

SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER

X1
CHECK
SWITCHING
LED
DEVICE
(YELLOW)
24 Vac
X2
SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER

L1
(HOT)
1
L2
M 6020

69-0348—1

Fig. 5—T8611R 2-stage heat/1-stage cool thermostat.
1
L1
L2
(HOT)
3
R
POWER
SUPPLY

HIGH
LIMIT
C/X
EM. HEAT
LED (RED)

AUX. HEAT
LED (GRN)
L

FAN
SWITCH

MONITOR

ON
THERMOSTAT
LOGIC
CIRCUIT

SUBBASE
LOGIC/
CONTROL
CIRCUIT

AUTO

AUXILIARY
HEAT RELAY

HEAT 2
E
EMERGENCY
HEAT RELAY
SYSTEM
SWITCH

W1
STAGE 1
HEAT RELAY

EM. HT.
G

HEAT

FAN RELAY
OFF

2
O

COOL

CHANGEOVER
RELAY (COOL)
B

HIGH
LIMIT

CHANGEOVER
RELAY (HEAT)

HEAT 1
Y1
COOL

COMPRESSOR
CONTACTOR
P

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

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

DEFROST
CONTROL
M 6019

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

Fig. 6—T8611R 2-stage heat/1-stage cool thermostat. Exact replacement for York model no. 2ET11700224.
L1
(HOT) 1

POWER
SUPPLY

HIGH
LIMIT

5
B

TRANSFORMER

EM. HEAT
LED (RED)

X
FAN
SWITCH

THERMOSTAT
LOGIC
CIRCUIT

MONITOR

SUBBASE
LOGIC/
CONTROL
CIRCUIT

W2
AUXILIARY
HEAT RELAY

AUTO

HEAT 2
E
EMERGENCY
HEAT RELAY

SYSTEM
SWITCH

W1
STAGE 1
HEAT RELAY

EM. HT.
G

HEAT

FAN RELAY
OFF

2
O

AUTO

CHANGEOVER
RELAY (COOL)
HIGH
LIMIT

H
CHANGEOVER
RELAY (HEAT)

HEAT 1

COOL

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.

COMPRESSOR
CONTACTOR

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.

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. 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.

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 thermostat 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°.

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.
5

69-0348—1

When the batteries are low, the display will flash REPL
BAT. Homeowner will have 20-30 seconds to replace batteries 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
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.
SET

Press

PRESENT
DAY/TIME

Press

DAY

.
to set the current day. Each press of the

DAY key advances the display one day.
Press TIME

AHEAD

BACK

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.

NOTE: When cooling setting is changed, thermostat will
wait up to 5 minutes before turning on the cooling equipment. 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
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.

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 equipment 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.

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
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.

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 selftest.
6

Perform the following test as a check of all thermostat
functions. If thermostat does not respond as indicated, thermostat 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.

System

Press

Switch

This

Position

Key

OFF

2. Set system switch to OFF. Press AHEAD and BACK
and PRESENT SETTING keys at the same time to enter
self-test.

COOL or
AUTO (with
fan in AUTO)

AM
PM

BAT

Blank

PRESENT
SETTING

Blank

PRESENT
SETTING

Cooling, fan and
SYSTEM LED on.

Cooling, fan and
SYSTEM LED off.

Blank

See note A

Blank

13
09

Microprocessor
mask no. and
revision no.
Blank

Blank

1st stage heating,
fan and SYSTEM
LED on.
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.
Blank

TO LAST
PERIOD

PRESENT
SETTING

REPL
SET
PT

Key Released
Blank

SKIP

Fig. 10—All segments on display.

Response
Key Down
03

CHANGE

NEXT
PERIOD

3. Press each key as listed below, and look for response
listed, as key is held down and released.

Look for this

SUN MON TUE WED THU FRI SAT COOL ON HEAT ON

OFF

WAKE LEAVE RETURN SLEEP TEMPORARY

WARMER

M410C

COOLER

AHEAD

BACK

LEAVE

RETURN

(CHECK
EACH
POSITION)
OFF

WAKE

SLEEP

DAY

SET
HEAT/COOL

SET
PRESENT
DAY/TIME

HEAT or
AUTO
(with fan
in AUTO)

SET
PRESENT
DAY/TIME

SET

PRESENT
DAY/TIME

SET

PRESENT
DAY/TIME

SET

PRESENT
DAY/TIME

OFF

HOLD
TEMP

RUN
PROGRAM

10
11

Normal operating
display.

END SELF-TEST
A 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

4-DIGIT CODE EXPLANATION

First
Digit

Cycle Rate Setting
(CPH at 50% on time,
2nd stage heat)

0 or 2
4 or 6

6
3

Second
Digit

Clock
(Hrs.)

Degrees

0
1
4
5

12
12
24
24

F
C
F
C

M 524

Third
Digit
0
2
4

System
Switch Position
HEAT, EM.HT, or OFF
AUTO
COOL

Fourth
Digit

Thermostat
Type No.

0
1

R
G

System
Switch
Position
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.
1985 Douglas Drive North
Golden Valley, Minnesota 55422

Home and Building Control
Honeywell Limited—Honeywell Limitée
740 Ellesmere Road
Scarborough, Ontario
M1P 2V9

Helping You Control Your World

QUALITY IS KEY

Printed in TAIWAN, R.O.C.

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Title                           : 69-0348 - T8611G,R  Chronotherm III  Fuel Saver Thermostats
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Honeywell Chronotherm Iii T8611G Users Manual 69 0348 T8611G,R Fuel Saver Thermostats

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