!
TRADELINE
T8611G,R
Chronotherm III
Fuel Saver Thermostats
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.
TABLE 1—Thermostat Models.
Thermostat Stages Switching LEDs Changeover Terminals Comments See Fig.
T8611G 2 1 EM.HEAT- ON- EM.HT, Auto R, C/X, L, — 4
T8611R 2 1 EM.HEAT- ON- EM.HT., Manual R,C/X,L, — 5
Heat Cool System Fan
HEAT-OFF- AUTO AUX.HT. W
AUTO-COOL B,Y,X2,X
HEAT-OFF- AUTO AUX.HT. W
21EM.HEAT- ON- EM.HT. Manual R,B,X,W
COOL O,B,Y,P
HEAT-OFF- AUTO E,W
COOL H,Y
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.
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.
,E,G,O,
2
1
,E,W1,G,
2
, Exact 6
2
,G,O, replacement
1
for York
1
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.
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. 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 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.
Fig. 2—Mounting subbase on wall.
WALL
WIRES THROUGH
WALL OPENING
WALL
ANCHORS
(2)
SUBBASE
MOUNTING
SCREWS (2)
MOUNTING
HOLES
M5175
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.
FOR STRAIGHT INSERTION –
STRIP 5/16 in. [8 mm]
SYSTEM
EM. HT.
HEAT
OFF
AUTO
COOL
F
A
N
O
N
A
U
T
O
A
U
X
. H
E
A
T
C
H
E
C
K
M5179A
RESTRICT
WIRING TO
THIS AREA
FRONT VIEW OF
TERMINAL AREA
WIRING TO BE BELOW
THIS SURFACE
CROSS-SECTIONAL VIEW OF
TERMINAL AREA
FOR WRAPAROUND –
STRIP 7/16 in. [11 mm]
TOP SURFACE
OF SUBBASE
M3062
2
Fig. 4—T8611G 2-stage heat/1-stage cool thermostat.
2
POWER
SUPPLY
FAN
SWITCH
HIGH
LIMIT
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
AUTO
COOL
ON
AUTO
HEAT 1
THERMOSTAT
LOGIC
CIRCUIT
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
3
POSSIBLE CHECK LED CIRCUITS:
SUBBASE
LOGIC/
CONTROL
CIRCUIT
HIGH
LIMIT
EM. HEAT
LED (RED)
COOL
AUX. HEAT
LED (GRN)
HEAT 2
C.O.
C.O.
CHECK LED
(YELLOW)
R
C/X
L
W2
E
G
O
B
Y
X1
X2
MONITOR
EMERGENCY
HEAT RELAY
FAN RELAY
CHANGEOVER
RELAY (HEAT)
3
1
L1
L2
(HOT)
AUXILIARY
HEAT RELAY
CHANGEOVER
RELAY (COOL)
COMPRESSOR
CONTACTOR
X1
CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)
X2
SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
TO R
TO C/X
X1
CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)
X2
SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER
TO R
TO C/X
X1
CHECK
SWITCHING
LED
DEVICE
(YELLOW)
SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER
24 Vac
X2
L1
(HOT)
L2
1
M 6020
369-0348—1
Fig. 5—T8611R 2-stage heat/1-stage cool thermostat.
3
POWER
SUPPLY
FAN
SWITCH
HIGH
LIMIT
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
ON
AUTO
THERMOSTAT
LOGIC
CIRCUIT
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
REMOVE JUMPER FOR SYSTEM WITH ISOLATED STAGE 1 HEATING AND COOLING CONNECTIONS.
2
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
3
SUBBASE
LOGIC/
CONTROL
CIRCUIT
HIGH
LIMIT
COOL
EM. HEAT
LED (RED)
HEAT 1
AUX. HEAT
LED (GRN)
HEAT 2
R
C/X
L
W2
E
W1
G
O
B
Y1
P
MONITOR
EMERGENCY
HEAT RELAY
FAN RELAY
2
CHANGEOVER
RELAY (HEAT)
DEFROST
CONTROL
1
L1
L2
(HOT)
AUXILIARY
HEAT RELAY
STAGE 1
HEAT RELAY
CHANGEOVER
RELAY (COOL)
COMPRESSOR
CONTACTOR
M 6019
4
Fig. 6—T8611R 2-stage heat/1-stage cool thermostat. Exact replacement for York model no. 2ET11700224.
POWER
SUPPLY
3
FAN
SWITCH
HIGH
LIMIT
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
AUTO
ON
AUTO
THERMOSTAT
LOGIC
CIRCUIT
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
REMOVE JUMPER FOR SYSTEM WITH ISOLATED STAGE 1 HEATING
AND COOLING CONNECTIONS.
3
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
4
REMOVE JUMPER FOR SYSTEM WITH ISOLATED EMERGENCY HEAT.
5
TRANSFORMER COMMON IS CONNECTED TO B TERMINAL.
SUBBASE
LOGIC/
CONTROL
CIRCUIT
COOL
HIGH
LIMIT
EM. HEAT
LED (RED)
HEAT 2
HEAT 1
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.
R
B
X
W2
E
W1
G
O
H
Y1
5
MONITOR
4
EMERGENCY
HEAT RELAY
FAN RELAY
2
CHANGEOVER
RELAY (HEAT)
AUXILIARY
HEAT RELAY
STAGE 1
HEAT RELAY
CHANGEOVER
RELAY (COOL)
COMPRESSOR
CONTACTOR
TRANSFORMER
M3206
Fig. 8—Battery placement.Fig. 7—Cycle rate adjustment.
L1
(HOT)
L2
1
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.
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.
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°.
569-0348—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.
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.
DAY key advances the display one day.
SET
PRESENT
Press .
DAY/TIME
Press to set the current day. Each press of the
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.
AHEAD
BACK
Checkout
Fig. 9—Mounting the thermostat on subbase.
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 equipment. 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 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.
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.
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.
2. Set system switch to OFF. Press AHEAD and BACK
and PRESENT SETTING keys at the same time to enter
self-test.
3. Press each key as listed below, and look for response
listed, as key is held down and released.
Fig. 10—All segments on display.
REPL
AM
BAT
SUN MON TUE WED THU FRI SAT COOL ON HEAT ON
WAKE LEAVE RETURN SLEEP TEMPORARY
PM
M410C
SET
PT
System Press Look for this
Switch This Response
Position Key Key Down Key Released
OFF 03 Blank
COOL or 15 Cooling, fan and
AUTO (with
fan in AUTO)
OFF 06 Blank
CHANGE
TO LAST
PERIOD
SKIP
NEXT
PERIOD
PRESENT
SETTING
PRESENT
SETTING
PRESENT
SETTING
WARMER
COOLER
07 Blank
15 Blank
SYSTEM LED on.
15 Cooling, fan and
SYSTEM LED off.
02 Blank
AHEAD
BACK
LEAVE
RETURN
(CHECK
EACH
POSITION)
OFF 08 Blank
HEAT or 14
AUTO
(with fan
in AUTO)
OFF 10 Blank
WAKE
SLEEP
DAY
SET
HEAT/COOL
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
HOLD
TEMP
RUN
PROGRAM
05 Blank
04 Blank
01 Blank
00 Blank
12 See note A
13 Microprocessor
mask no. and
revision no.
09 Blank
14 Blank
1st stage heating,
fan and SYSTEM
LED on.
2nd stage heating
14
and AUX. HEAT
LED also on.
2nd stage heating
14
and AUX. HEAT
LED off.
1st stage heating,
14
fan and SYSTEM
LED off.
Normal operating
11
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.
769-0348—1
4-DIGIT CODE EXPLANATION
Cycle Rate Setting
First (CPH at 50% on time,
Digit 2nd stage heat)
0 or 2 6
4 or 6 3
Second Clock
Digit (Hrs.) Degrees
012F
112C
424F
524C
M 524
Third System
Digit Switch Position
0 HEAT, EM.HT, or OFF
2 AUTO
4 COOL
Fourth Thermostat Switch
Digit Type No. Position
0RCOOL, OFF
1GCOOL,
System
AUTO or
OFF
2REM.HT.
or HEAT
3GAUTO,
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 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
Printed in TAIWAN, R.O.C.
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