Honeywell Chronotherm Iii T8611M Users Manual 68 0076 (7 Day Programming) Lll Heat Pump Thermostats

CHRONOTHERM T8621A 68-0076

T8611M to the manual cf62be26-c807-46f8-a239-45dd5c6d4914

2015-01-23

: Honeywell Honeywell-Chronotherm-Iii-T8611M-Users-Manual-261440 honeywell-chronotherm-iii-t8611m-users-manual-261440 honeywell pdf

Open the PDF directly: View PDF .
Page Count: 32

Download
Open PDF In Browser	View PDF

T8611M
(7-Day Programming)
Chronotherm III™
Heat Pump Thermostats
The T8611M Chronotherm III Programmable
Thermostat provides automatic control of multistage heat pump systems and offers users the
highest standard of comfort and convenience
available with energy savings.

■ Full seven-day program capability; different schedules may be selected for every day.
■ Can be programmed in hand (with batteries installed) or on the wall to provide up to four temperature periods per day.
■ Large digital clock (liquid crystal display) indicates continuous time-of-day, day-of-week, current period and room temperature.
■ Adaptive Intelligent Recovery™ brings room temperature to programmed temperature at programmed time, maximizing comfort and energy savings.
■ Temperature control program maintains temperature within 1° F of setpoint.
■ Temporary program override available by using—
—WARMER and COOLER keys.
—SKIP next period key.
—CHANGE to last period key.
■ HOLD TEMP key provided for indefinite program
override (vacation/holiday).
■ Installer self-test with time delay override saves
installation time.
■ SYSTEM light-emitting diode (LED) on thermo-

■
■
■
■
■
■

stat indicates system is energized.
AUX. HT., EM. HT., CHECK LEDs available on
select models.
Automatic heat/cool changeover.
Batteries included provide power to maintain clock
and memory during power failures.
Switching subbase with wiring terminals included.
Powered directly from control transformer.
Model available with separate sensor for remote

CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Selection/Application ..................................... 5
Installation ................................................... 12
Checkout ....................................................... 18
Programming The Thermostat ..................... 20
Operating The Thermostat ........................... 25
Operation ..................................................... 27
Troubleshooting ........................................... 29
Glossary ....................................................... 30
Table of Contents ......................................... 32

temperature sensing.
1

68-0076—1

C. H. • Rev. 10-92 • ©Honeywell Inc. 1992 • Form Number 68-0076—1

T8611M
SPECIFICATIONS • ORDERING INFORMATION

Specifications
TRADELINE MODELS
TRADELINE models are selected and packaged to
provide ease of stocking and handling and also maximum

Thermostat
T8611M*

Stages
Heat
Cool
3
2

replacement value.
TRADELINE models available are listed in Table 1.

TABLE 1—TRADELINE MODELS AVAILABLE.
Changeover
Switching
Type
System
Fan
Automatic
EM. HT.-HEAT-OFFON-AUTO
AUTO-COOL

Application
Heat Pump

Program
7-Day

*Model available with separate sensor for remote temperature sensing.
LIGHT-EMITTING DIODES (LEDs):
SYSTEM LED (yellow) on thermostat lights during
thermostat heating and cooling ON cycles.
EM.HT. LED (red) on subbase lights when system
switch is in EM.HT. On some systems, light may
indicate need to switch to EM.HT. because of heat
pump problem.
AUX. HT. LED (green) on subbase lights when thermostat is calling for operation of auxiliary heat.
CHECK LED (yellow) on subbase lights when an
equipment or system problem needs to be checked.
Consult heat pump literature to determine meaning.
VOLTAGE RATING: 15 to 30 Vac.
CURRENT RATING: 1.6A maximum, total per stage.
OPERATING HUMIDITY RANGE: 5 to 90 percent relative humidity, noncondensing.
OPERATING AMBIENT TEMPERATURE RANGE:
40° F to 110° F [4° C to 43° C].
SET POINT RANGE: 45° F to 88° F [7° C to 31° C].
CALIBRATION: Self-calibrating thermostat and thermometer to ±1° F.
SHIPPING TEMPERATURE: -20° F to +120° F [-29° C
to +49° C].
CYCLES PER HOUR ADJUSTMENT:
Auxiliary heating—factory-set at 3 cph (adjustable to

6 cph for special systems); minimum off-time of five
minutes.
Nonauxiliary heating and cooling—factory-set (not
field adjustable); minimum off-time of five minutes.
FINISH: Beige matte with decorative brushed metal faceplate.
DIMENSIONS: Thermostat (mounted on subbase)—7 in.
[178 mm] long, 5-5/16 in. [135 mm] high, 1-3/4 in.
[44 mm] deep. See Fig. 1 for subbase dimensions. See
Fig. 2 for remote sensor dimensions.
TYPICAL KEYPAD: See Fig. 3.
REPLACEMENT PARTS:
202905AA Remote Temperature Sensor.
220529 Replacement Door.
AAA alkaline batteries, available locally.
ACCESSORIES:
193121A Cover Plate Assembly. Includes cover plate,
adapter ring and screws; 6-9/10 in. x 4-3/4 in. [175
mm x 121 mm]. Covers marks left by old thermostat.
Allows mounting on vertical or horizontal outlet
box.
TG512 Universal Thermostat Guards. Includes clear or
opaque plastic or metal cover, ring base, opaque
plastic wallplate, tumbler lock with two keys.
TG586A Locking Cover.

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, or specify—
1. Model number.
3. Remote temperature sensing, if desired.
2. Number of heat and cool stages desired.
If you have additional questions, need further information or would like to comment on our products or services, please write or phone:
1. Your local Honeywell Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Satisfaction
Honeywell inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 (612) 951-1000
In Canada—Honeywell Limited/Honeywell Limitée 740 Ellesmere Road, Scarborough, Ontario M1P 2V9. 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.

T8611M
SPECIFICATIONS

Fig. 1—T8611 Subbase mounting dimensions in in. [mm].

31
32
[50]

13
1
16
[46]
3
4 32
[104]

5
16
[135]
5

3
4

5
[83]
16

3
[121]
4
7 [179]

M5181A

Fig. 2—202905AA Remote Sensor dimensions in in. [mm].
FRONT

BACK

SIDE

31
32
[50]

[51]

3
4 32

31 [50]
32

19
[8]
64

41
64 [16]

[104]

9 [4]
64

1 3 [35]
8

1
DIA.
2
[13]

1 [25]

M5244

68-0076—1

T8611M
SPECIFICATIONS

Fig. 3—Typical thermostat keypad.

SYSTEM

ROOM
WED
HEAT ON

MIDDAY

TEMPERATURE
PRESENT
SETTING

RUN
PROGRAM
TIME
SET
PRESENT
DAY/TIME

DAY

PERIOD

COPY
FROM

HOLD
TEMP

SET
HEAT/COOL

CANCEL
PERIOD

COPY
TO

AHEAD

WARMER

BACK

COOLER

SKIP
NEXT
PERIOD
CHANGE
TO LAST
PERIOD

FAN

HEAT

OFF

COOL

AUTO

M5360

T8611M
SELECTION/APPLICATION

Selection/Application
The T8611 Thermostat uses the latest microelectronic
design and control technology to provide home and building owners with the highest level of comfort available and
optimal energy savings in a package that is easy to use and
easy to live with.
The following section is a guide to selection and application of the best thermostat to meet individual customer
needs.

IF RETROFIT/REPLACEMENT APPLICATION,
CONSIDER
• equipment requirements
— system switching (manual: EM. HT.-HEAT-OFFCOOL, automatic: EM. HT.-HEAT-OFF-AUTOCOOL).
— unique heat pump functions of emergency or
supplemental heat, changeover on heat or cool,
and status indication.
— Table 3 lists typical applications by manufacturer.

PROGRAMMING
Does the thermostat selected accommodate the
customer’s daily schedule, lifestyle or work schedule?
Refer to choices below.
TRADELINE
Device
Programming
T8611G,R*
Weekday,
Sat, Sun.

T8611M

7-day
(each day
different)

• existing wiring
— Are there enough conductors to operate the equipment and the thermostat? Can a new cable be
pulled?

Daily Temperature
Selection
4 heat and
4 cool

• existing thermostat
— Table 3 is a guide for replacing popular Honeywell
standard nonprogrammable thermostats with a
T8611.

4 heat and
4 cool

SECURITY
Does the thermostat selected provide access to programming and the override features that will best suit the
application? Refer to choices below.
Access
Free access to
programming
and adjustment/
override.
Restricted
access to
device.

*Specifications form 68-0057 for information.
IF NEW CONSTRUCTION APPLICATION,
CONSIDER
• equipment type (see manufacturer’s specifications)
— system switching required
— status indication provided
• control wiring—number of conductors required to
operate equipment and thermostat.
IMPORTANT: The T8611 requires a conductor to transformer common to provide continuous 24V power
for thermostat operation. This feature is commonly
specified and provided by equipment manufacturer.

Typical
Application
Device
Home or
T8611
owner-occupied
commercial
building.
Public building. T8611 with TG512
Locking Cover;
T8611 with remote
temperature
sensing.

68-0076—1

T8611M
SELECTION/APPLICATION
Table 2 lists features and wiring terminal functions of the TRADELINE T8611M thermostat.
TABLE 2—T8611M FEATURES AND TERMINALS.
T8611M
FEATURES
Heating Stages
Cooling Stages
Changeover
Programming
SYSTEM LED
EM. HEAT LED (red)
AUX. HEAT LED (green)
CHECK LED (yellow)
Remote Temperature
Sensing
WIRING TERMINAL
FUNCTION
24 Vac Common

COMMENTS
May be applied to 2-stage heat pump systems; see wiring
diagrams Figs. 6 and 7.

3
2
Auto
7-day
Yes
Yes
Yes
Yes
Yes

Lights on call for heat or cool.
Lights continuously in EM. HEAT mode.
Lights during call for final auxiliary heat stage.
Field wired option; indicates equipment malfunction.
Available on T8611M7040 only. (202905A Remote Sensor
included).

24 Vac Power
Compressor, Stage 1
heat and cool.
Compressor,
Stage 2 cool
Second Stage Heat
Auxiliary (Resistive)
Third Stage Heat

Must be connected to control transformer to operate
thermostat.

R
Y
Y2

If applying T8611M to 1-stage cooling system, leave Y2
unconnected.
If applying T8611M to 2-stage heat systems in which the
second stage is compressorized, connect stage 2 to W2;
leave W3 unconnected.
If 2-stage heat system in which the second stage is auxillary
(electric resistive), connect auxiliary stage to W3; leave
W2 unconnected.

W2
W3

Fan
Changeover Heat Mode

G
B

Changeover Cool Mode

System Monitor,
continuously energized
in EM. HEAT mode.
Emergency Heat
energized on call for
stage 1 heat in
EM. HEAT mode
Check LED terminals
to indicate equipment
malfunction
Remote Temperature
Sensing

O/B changeover terminals are energized continuously
following first call for cool or heat, respectively.
Energizes EM. HEAT LED when externally powered.

See wiring diagrams for hookup alternatives.

Available on T8611M7040 only. Must be connected to
202905A Remote Sensor for proper thermostat operation.

T8611M
SELECTION/APPLICATION
TABLE 3—T8611 GUIDE FOR REPLACING POPULAR T874 AND T872 THERMOSTATS,
BY EQUIPMENT MANUFACTURER.
(NOTE: Also see form 70-6627, Heat Pump Thermostat Cross Reference Guide, for wiring hookup illustrations.)

Thermostat (Subbase Included)
Auto
Manual
Changeover
Changeover
Weekday,
Weekday,
Sat, Sun
Sat, Sun
Auto
T8611G1004
T8611R1000
Changeover
T8611G1012 (° C) T8611R1042 (° C)
7-day
T8611G1103
T8611R1141
T8611M7008
(Premier White) (Premier White) T8611M7040c Thermostat Subbase Thermostat Subbase
(also see form 68-0057, Specifications)
T874
Q674
T872
Q672
Amana
•
D1009
F1022
D1003
F1026
•
D1017
D1011
•
D1165
D1300
Arco/Comfort Maker
•
•a
•
na
na
na
na

•

Arco/Friedrich
na
na

•
•

Bard
N1024
R1129

• a,b
•a
a

•

•
•
•

•a

•

•a
•
•
•
•
•
•
•

•
•
•
•
•
•
•
•
•
•
•
•
•
•

•

•a

•
•
•
changeover
•
•
•
•
•
•
•
•
•

Comments
Separate first stage
heat/cool terminals W1, Y1.

Check LED optional;
X = X1, jump X2 to C.

N1036
R1146

F1299
L1185

Changeover on heat (typical),
check LED optional, equipment
terminal W1 to thermostat B.

Bryant, Day-Night, Payne
G1451 F1113b G1166
G1261
F1253
J1010
L1371
G1174

F1125

Check LED optional; F = X1,
jump X2 to C. Note: P terminal
available
on
manual

R1335
Carrier
G1055
G1071
G1121

F1261
L1181

L1405
J1035
L1041
L1397
P1005

L1371
L1074
F1059
F1030
F1063
E1114
E1042
D1264
L1116
Command Aire
H1005 C1041
G1352 C1066

(T8611R) models only.
G1075
G1158
G1182
G1273
G1307
G1257

J1054
L1052

Check LED optional (typical)

L1169

J1002
J1028
D1074

•
•
•
•
•
•
a
No CHECK LED.
b
Dual transformer requires conversion to single transformer.
c
Model includes separate sensor for remote temperature sensing.

Changeover on heat,
check LED optional.

Multistage heat pump
No Supl. Ht. function
No Supl. Ht. function
Multistage heat pump
H1009

C1086

No AUX. HEAT or EM.
HEAT required; Y1 = 0

(continued)
68-0076—1

T8611M
SELECTION/APPLICATION

TABLE 3—T8611 GUIDE FOR REPLACING POPULAR T874 AND T872 THERMOSTATS,
BY EQUIPMENT MANUFACTURER (Continued).
(NOTE: Also see form 70-6627, Heat Pump Thermostat Cross Reference Guide, for wiring hookup illustrations.)

•

•a
•a
•a

•

•a

•

•
•
•
•
•
•
•
•
•
•
•
•

Crispaire/Marvair
G1089
F1162
G1208
F1204
R1111
L1215
R1156
Fedders/Airtemp/Climatrol
C1398
L1090
C1509
C1406
C1517
C1414
C1541
Florida Heat Pump
na
na

•
•
•
•
•
•
•
•
•
•
•
G1212
F1238
•
•
G1139
a
No CHECK LED.
b
Dual transformer requires conversion to single transformer.
c
Model includes separate sensor for remote temperature sensing.
8

Late models optional check
LED. Z = X2, jump X1 and C,
K = L.
Earlier T.H.E. models with
reverse-acting EM. HT.
require relay isolation.

F1166
F1323
L1094
L1102

Heatwave/Southwest Mfg.
G1105
F1170
G1232
F1224
Heil Quaker/Whirlpool/Tempstar
R1137
L1132
R1172
L1193
Honeywell
A-D (typ.) F1006
F1022
F1048
C1000
F1089
C1018
C1117
C1240
G1246
F1212
G1444

Comments

A-D (typ.) F1000
F1026
F1042
C1004
F1075
C1038
C1350
C1566
G1224
F1208
G1000
F1018
G1018
G1083
F1158

Separate first stage heat/cool
terminals required; check LED
optional; equipment terminal
K to thermostat E.
Optional check LED;
X = X1, jump X2 to C.

Equipment terminal B
to thermostat C.
Separate first stage
heat/cool terminals.

°C
°C
TRADELINE
°C

(continued)

T8611M
SELECTION/APPLICATION
TABLE 3—T8611 GUIDE FOR REPLACING POPULAR T874 AND T872 THERMOSTATS,
BY EQUIPMENT MANUFACTURER (Continued).
(NOTE: Also see form 70-6627, Heat Pump Thermostat Cross Reference Guide, for wiring hookup illustrations.)

Thermostat (Subbase Included)
Auto
Manual
Changeover
Changeover
Weekday,
Weekday,
Sat, Sun
Sat, Sun
Auto
T8611G1004
T8611R1000
Changeover
T8611G1012 (° C) T8611R1042 ( ° C)
7-day
T8611G1103
T8611R1141
T8611M7008
(Premier White) (Premier White) T8611M7040c Thermostat Subbase Thermostat
(also see form 68-0057, Specifications)
T874
Q674
T872
Honeywell (continued)
•
•
•
N1016
F1220
N1002
•
•
•
N1040
F1261
N1028
•
•
•
R1004
B1042
R1008
•
•
•
B1109
R1057
•
•
•
R1152
L1207
R1198
•
•
•
R1285
L1157
•
•
•
R1350
L1181
Janitrol/Tappan
•
•
•
G1147
F1139
G1109

Subbase
Q672

Comments

F1133
F1216
B1046
L1037
L1227

Changeover on heat; equipment terminal C to thermostat
Y, W1 to B, K to E.

F1117

Equipment terminal C to
thermostat C.
NOTE: Rewire for single 75

Lennox
VA

transformer if two-transformer
system.
•
•
•
•
•
•
•
•
•

•
•
•
•
•
•
•
•
•

•
•
•
•
•
•
•
•
•
•
•

G1014
G1022
G1162
G1154
R1024
R1040
R1178
C1148
D1207

F1113
E1148
F1105
B1160
B1202
L1355
L1165
L1165
L1199
L1389

TerGuide:

a
No CHECK LED.
b
Dual transformer
c

requires conversion to single transformer.
9
Model includes separate sensor for remote temperature sensing.

G1026
G1125
G1091
G1323

F1067
E1019

°C
DoD specs—use guard.

L1201

Two-speed unit; optional check
LED; thermistor A not used.
minal Conversion
Lennox Standard
Transformer
Common
X
C
Transformer
Power
VR (in)
R
V (out)
Compressor
M
Y
M2
Y2
Aux. Heating
Y
W2
Fan
F
G
Changeover
R
O
System Monitor L L,X1,X2
Em.Heat (cycling) E
E
Thermistor
A
T (not
required)
(continued)
68-0076—1

Thermostat (Subbase Included)
Auto
Manual
Changeover
Changeover
Weekday,
Weekday,
Sat, Sun
Sat, Sun
Auto
T8611G1004
T8611R1000
Changeover
T8611G1012 (° C) T8611R1042 (° C)
7-day
T8611G1103
T8611R1141
T8611M7008
(Premier White) (Premier White) T8611M7040c Thermostat Subbase Thermostat Subbase
(also see form 68-0057, Specifications)
T874
Q674
T872
Q672
Luxaire
•
•
•
G (Borg F1188
G1315
F1281
Warner)
Magic Chef
•
na
na
na
na
•

•a

•

•
•
•
•
•
•

•

Earlier PB series, separate first
stage heat/cool.
Late PE series, optional check
LED; X1 = X1, jump X2 to R.

G1133
G1141
R1081
R1107

F1158
L1157
L1045
L1136

C1525

F1182

Separate first stage heat/cool
required; optional check LED;
X = X1, jump X2 to R.

•

Trane/General Electric
G1204
J1043
G1059

J1039

Optional check LED; F = X1,
jump X2 to C; T not used;
equipment terminal B to thermostat C, R to R, Y to Y (Y1 +
W1), W to W2, G to G, 0 to 0,
X2 to E.

•

Weather King
na
na

F1265

Optional check LED; X = X1,
jump X2 to R; equipment terminal C to thermostat C, W1
to Y (W1 + Y1), E to W2,
Y1 to 0.

•a

Comments

Rheem/Ruud
G1097
F1238
G1238
G1220
R1079
R1095
Square D/Sun Dial
C1224
F1071

G1265

a
No CHECK LED.
b
Dual transformer
c

requires conversion to single transformer.
Model includes separate sensor for remote temperature sensing.
(continued)

•
•
•

•
•
•
•
•
•
•
•

•
•
•
•
•
•
•
•
•

•
•
•
•
•
•
•
•

R1012

B1109

Westinghouse
G1048
F1121
F1246
F1279
J1019
J1050
R1103
L1108
L1173

R1016
G1265
G1281

B1103
F1265

G1034

•

•
•

•
•
•
•

•a
•
•
•

•
•
•
•

•
•
•
•
•
•

•
•

Equipment terminal C1 to thermostat C, W1 to Y (W1 + Y1),
Y1 to 0. Common to thermostat
direct from control transformer.

F1141
F1091
F1257
J1013
J1062
L1110
L1128
L1151
na

D1108

L1223

G1356

L1219

1F58-910/S28 series.

na
na

Changeover on heat; W1 = B.

G1042
G1299
G1331
G1364

J1021
L1177
D1077

R1149

ter•

Comments

White Rodgers
na
na
Williamson
R1236
L1348
N1008
F1196
York/Borg Warner
G1170
J1027
G1295
F1311
G1345
L1363
G1402 D1032

Separate first stage heat/cool
minals required.
2-speed heat pump; optional
check LED; L = X1, jump
X2 to C.

Optional check LED; X = X1,
jump X2 to C; equipment terminal B to thermostat C,
W to W2, H to B, T not re-

quired.
G1410
G1428
G1436
R1046
R1169
R1251
Zone Aire
N1040
R1350

G1398
L1017
L1330
L1272
F1261
L1181

R1032

L1011

Changeover on heat;
W1 = B.

a
No CHECK LED.
b
Dual transformer
c

requires conversion to single transformer.
Model includes separate sensor for remote temperature sensing.
11

68-0076—1

T8611M
INSTALLATION

Installation
COMPATIBILITY
The T8611 Thermostats will replace most heat pump
system thermostats. As long as ac power is continuously
available to the thermostat, the thermostat will be compatible with almost any low-volt control system.

This thermostat requires a single transformer. A twotransformer system may require turning off two switches
or disconnects, and rewiring to run the thermostat from a
single transformer. Make sure the transformer has adequate power (VA) for the heating/cooling control system.
Add current ratings of the system components (such as
auxiliary heat relay, changeover relay, fan relay). Multiply
this total by 24V to determine transformer VA required.
Remove any existing wallplate or subbase from 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.

WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.
2. Check the ratings given 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.

IF NEW INSTALLATION
Run cable to a hole at the selected wall location for
thermostat and remote sensor, and pull about 3 in. [76 mm]
of wire through the opening. Color-coded, 18-gauge thermostat cable with at least 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.
If using thermostat model with remote temperature
sensing, run 3-wire, 18-gauge thermostat cable from the
thermostat location to the sensor location (200 ft. [61 m]
maximum). Route cable away from sources of electrical
noise.

CAUTION
Disconnect power supply to prevent electrical
shock or equipment damage.

LOCATION
Thermostat with Integral Sensor
Install thermostat and subbase about 5 ft. [1.5 m] above
the floor in an area with good air circulation at room
temperature.
Do not install the thermostat where it may be affected
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.

MOUNTING SUBBASE
IMPORTANT: Set the subbase system switch in the OFF
position before mounting.
The subbase does not require leveling for operation, but
for appearance only.
Remove thermostat from subbase (Fig. 4).

Thermostat with Remote-Mounted Sensor
Install thermostat in an area that is accessible for setting
and adjusting the temperature and settings.
Install remote temperature sensor in an area with good
air circulation at average temperature.
Do not install the sensor where it may be affected 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 sensor, such
as an outside wall.
IF REPLACING AN EXISTING THERMOSTAT
Turn thermostat power off at furnace or heat pump.

T8611M
INSTALLATION
Fig. 4—Removing thermostat from subbase.

Use a 3/16 in. bit to drill the required holes. Gently tap
anchors into holes until they are flush with the wall

The subbase mounts directly onto the wall with the
screws and anchors included. Instead, the subbase can be
mounted on a vertical or horizontal outlet box. If you must
mount the subbase on a vertical outlet box, order 193121A
Adapter Assembly. The assembly includes an adapter
ring, two screws and a cover plate to cover marks on the
wall. Install the ring and cover plate on the vertical outlet
box as instructed.
Use the subbase as a template, and with a pencil, mark
the two mounting screw positions (Fig. 5).
If drywall construction, plastic anchors must be used;
use 3/16 in. bit to drill holes for anchors. Gently tap
anchors into holes until they are flush with the wall
surface.

WALL
REMOTE SENSOR
COVER
WIRES
THROUGH
WALL
OPENING

WALL
ANCHORS (2)
MOUNTING HOLES

REMOTE
SENSOR BASE

Thread wires through the center opening of the subbase.

M1549B

WIRING
HOLE
MOUNTING
SCREWS (2)

surface. Thread wires through the opening in the base.
Mount remote sensor base using the screws provided. See
Fig. 6. Make sure base looks level before tightening
screws.
Fig. 6—Mounting remote sensor base on wall.

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.
Push excess wire back into the hole, and plug hole with
nonhardening caulk, putty or insulation to prevent drafts
from affecting operation of thermostat and remote sensor,
if applicable.
Refer to Figs. 8-10 for typical hookups of subbase and
thermostat.
After wiring remote sensor, replace cover.
NOTE: Restrict all wiring to recessed area surrounding

Mount the subbase using two screws provided. Gently
tighten screws, level top surface of subbase, and securely
tighten screws.
Fig. 5—Mounting subbase on wall.

MOUNTING REMOTE TEMPERATURE SENSOR
(IF APPLICABLE)
The remote sensor mounts directly on the wall with
screws and anchors included. Remove cover from remote
sensor (Fig. 6). Use the remote sensor base as a template,
and with a pencil, mark holes for mounting screws.

68-0076—1

T8611M
INSTALLATION

terminals (Fig. 7) to assure thermostat/subbase contact.
1

7
R
POWER
SUPPLY

HIGH
LIMIT

L2
3
C

FAN
SWITCH

AUX. HEAT
LED (GRN) MONITOR

EM. HEAT
LED (RED)

AUTO

AUXILIARY
HEAT RELAY
W3
HEAT 3

STAGE 2
HEAT RELAY
W2
HEAT 2

SUBBASE
LOGIC/
CONTROL
CIRCUIT

THERMOSTAT
LOGIC
CIRCUIT

EMERGENCY
HEAT RELAY

E
FAN RELAY
SYSTEM
SWITCH

G
CHANGEOVER
RELAY (COOL)

EM. HT.
O

HEAT
C.O.

OFF
AUTO

CHANGEOVER
RELAY (HEAT)
B

COOL

COOL 1

C.O.

STAGE 2 COMPRESSOR
CONTACTOR

HIGH
LIMIT
Y2
COOL 2

STAGE 1 COMPRESSOR
CONTACTOR
Y

HEAT 1

6
X2

CHECK LED
(YELLOW)

202905 REMOTE
SENSOR

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2

POSSIBLE CHECK LED CIRCUITS:
X2

TO R

CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)

TO C

SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
3

CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)

X2
CHECK SWITCHING
LED
DEVICE
(YELLOW)
24 Vac
X1

L1
(HOT)
1
L2

SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER

SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER

SOME OLDER HEAT PUMP THERMOSTATS USE X FOR COMMON TERMINAL.

4 NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C TERMINALS FOR THERMOSTAT OPERATION.
5

RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 ft. [61 m] MAXIMUM LENGTH. ROUTE INTERCONNECT
CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.

6 APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR.
7

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

L1
(HOT)

M1017D

T8611M
INSTALLATION

Fig. 7—Restrict wiring to recessed area surrounding terminals.
1

L1
(HOT)

R
POWER
SUPPLY

HIGH
LIMIT

L2
3
C
EM. HEAT
LED (RED)

FAN
SWITCH

AUX. HEAT
LED (GRN)

MONITOR

ON
AUTO

W3
STAGE 2
HEAT RELAY

HEAT 3

W2
HEAT 2
SUBBASE
LOGIC/
CONTROL
CIRCUIT

THERMOSTAT
LOGIC
CIRCUIT

EMERGENCY
HEAT RELAY
E
FAN RELAY

SYSTEM
SWITCH

G
CHANGEOVER
RELAY (COOL)

EM. HT.
O

HEAT
C.O.

OFF

CHANGEOVER
RELAY (HEAT)

AUTO
B

COOL

COOL 1

C.O.
STAGE 1 COMPRESSOR
CONTACTOR
Y

HEAT 1

STAGE 2 COMPRESSOR
CONTACTOR
HIGH
LIMIT

Y2
COOL 2

AAA
A
AAA

202905 REMOTE
SENSOR

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

POSSIBLE CHECK LED CIRCUITS:
X2

TO R

CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)

TO C

SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER

CHECK LED
(YELLOW)

SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER

X2
CHECK SWITCHING
LED
DEVICE
(YELLOW)
24 Vac
X1

L1
(HOT)
1
L2

SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER

SOME OLDER HEAT PUMP THERMOSTATS USE X FOR COMMON TERMINAL.

NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C TERMINALS FOR THERMOSTAT OPERATION.

RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 ft. [61 m] MAXIMUM LENGTH. ROUTE
INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.

6
7

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR.

M1018D

68-0076—1

T8611M
INSTALLATION

Fig. 8—T8611M Thermostat with EM.HT.-HEAT-OFF-AUTO-COOL system and ON-AUTO fan switching;
EM.HT., CHECK, and AUX. HT. LEDS. Applied to 3-stage heat/2-stage cool system.
Fig. 9—T8611M Thermostat with EM.HT.-HEAT-OFF-AUTO-COOL system and ON-AUTO fan switching,
1

L1
(HOT)

R
4

HIGH
LIMIT

POWER
SUPPLY

L2
3
C

FAN
SWITCH

AUX. HEAT
LED (GRN) MONITOR

EM. HEAT
LED (RED)

L
AUXILIARY
HEAT RELAY

AUTO
W3
HEAT 3
W2

EMERGENCY
HEAT RELAY

HEAT 2
SUBBASE
LOGIC/
CONTROL
CIRCUIT

THERMOSTAT
LOGIC
CIRCUIT

FAN RELAY
SYSTEM
SWITCH

G
CHANGEOVER
RELAY (COOL)

EM. HT.
HEAT

O
C.O.

OFF

CHANGEOVER
RELAY (HEAT)

AUTO
B

COOL

COOL 1

C.O.
STAGE 1 COMPRESSOR
CONTACTOR
Y

HEAT 1
COOL 2

HIGH
LIMIT

AA
AAAAA
AA

CHECK LED
(YELLOW)
X1

202905 REMOTE
SENSOR

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2

POSSIBLE CHECK LED CIRCUITS:
X2

TO R

CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)
X1

TO C

SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
3
4

TO R

CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)
TO C

SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER

X2
CHECK
SWITCHING
LED
DEVICE
(YELLOW)
24 Vac
X1

L1
(HOT)
1
L2

SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER

SOME OLDER HEAT PUMP THERMOSTATS USE X FOR COMMON TERMINAL.
NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C TERMINALS FOR THERMOSTAT OPERATION.

RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 ft. [61 m] MAXIMUM LENGTH. ROUTE
INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.

APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR.

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
M1019D

T8611M
INSTALLATION
EM.HT. and CHECK LEDs. Applies to 2-stage
heat/2-stage cool system in which both heating
stages are compressorized.
Fig.10—T8611M Thermostat with EM.HT.-HEATOFF-AUTO-COOL system and ON-AUTO fan
switching; EM.HT., CHECK, and AUX. HT. LEDs.
Applied to 2-stage heat/1-stage cool system.

The Stage 1 cycle rate of this thermostat is factory-set
for heat pumps and cannot be adjusted. The auxiliary heat
cycle rate can be adjusted by turning the cycle rate adjustment screw on the back of the thermostat. See Fig. 11.
Increasing the cycle rate will reduce room temperature
swings when auxiliary heat is being used.

ADJUSTING CYCLE RATE
To customize the thermostat last heating stage cycling
performance to various types of auxiliary heating equipment, a cycle rate adjustment screw is provided on the back
of the thermostat to provide optimum savings and occupant
comfort.

INSTALLING BATTERIES
Three AAA alkaline batteries are included to provide
backup to prevent program loss in case of power outage.
Install batteries in back of thermostat as shown in Fig. 12.
Without battery backup, the program will remain about
20 seconds in event of power loss.

NOTE: MOST APPLICATIONS WILL NOT REQUIRE
A CHANGE IN CYCLE RATE.

IMPORTANT: When batteries are first installed, the
display will flash 1:00 PM and 32°. After a brief
delay, the display will flash 1:00 PM and room
temperature.

The room air temperature normally will vary slightly
from the comfort temperature setting with the cycling of
the heat pump or auxiliary heater.

When the batteries are low, the display will flash REPL
BAT. Homeowner will have 20-30 seconds to install new
batteries after removing old batteries from back of thermostat. After 20-30 seconds, it will be necessary to reprogram. REPL BAT indication will disappear within 5-10
minutes when thermostat is remounted on the powered
subbase.

Fig. 11—Cycle rate adjustment.

IMPORTANT: For proper thermostat operation, always
replace dead batteries with new alkaline batteries.
If batteries are completely dead, the display will go
blank when the thermostat is removed from subbase. After
replacing the batteries, reprogramming will be necessary.
POWER OUTAGES
Backup batteries will hold the programming and keep
the display on during most power outages. Once the power
is restored, the system will resume normal operation.
If the display goes off when power is lost, either the
backup batteries need to be replaced or are not installed.
When power is restored, the display will flash 1:00 PM to
remind you to reprogram.
Fig. 12—Battery placement.

MOUNTING THE THERMOSTAT
SET
With system
switch set to OFF, hang the thermostat on
PRESENT
the tabs at DAY/TIME
the top of the subbase (Fig. 13A). Swing down
and press on lower edge until thermostat snaps in place
(Fig. 13B). DAY
Open cover and tighten the captive mounting
screws (Fig. 13C).
BACK

SETTING DAYAHEAD
AND TIME
Restore 24V power to the thermostat. Set present day
and time.
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
68-0076—1
subbase, making sure it is firmly attached.
— check to see that batteries are installed properly.

T8611M
INSTALLATION • CHECKOUT

Fig. 13—Mounting thermostat on subbase.

Checkout
COOLING

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.

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 five minutes before turning on the cooling
equipment. This delay protects the compressor.

HEATING
NOTE: 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 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.

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 should shut off, followed by the fan.

NOTE: On an AUTO changeover thermostat, the heating
temperature must be set at least 3° F [2° 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 [2° C] above the
heating temperature, or display will flash.

T8611M
CHECKOUT
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.

System
Switch
Position
OFF

Press
This
Key
CHANGE
TO LAST

PERIOD

Blank

15
15

1st stage cooling, fan and
SYSTEM LED on.
2nd stage cooling also on.

2nd stage cooling off.

15
06

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

Blank

BACK

Blank

COPY

01
00

Control microprocessor
mask no. and revision no.
Blank

See note A .

Blank

Interface microprocessor
mask no. and revision

Blank

1st stage heating, fan
and SYSTEM LED on.
2nd stage heating also on.

SKIP

INSTALLER SELF-TEST (OPTIONAL)

PERIOD
PRESENT
SETTING

IMPORTANT:
• Thermostat must have ac power to perform self-test.
• Five-minute time delay on compressor does not
function during self-test.

COOL or

PRESENT
SETTING

AUTO
(with fan
in AUTO)

Perform the following test as a check of all thermostat
functions. If thermostat does not respond as indicated,
thermostat and subbase must be replaced.

PRESENT
SETTING

1. Press AHEAD and BACK keys at the same time.
While holding keys down, all segments of the display
should be on (see Fig. 14).

OFF
WARMER
COOLER

AHEAD

Fig. 14—All segments on display.

AM
PM

REPL

Look For This Response
Key
Down
Key Released
03 Blank

FROM

SET
PT

BAT
ROOM
SUN MON TUE WED THU FRI SAT TEMPORARY OUTDOOR
MORNING MIDDAY EVENING NIGHT COOL ON HEAT ON

COPY
TO

(CHECK
EACH )
POSITION)
OFF

M 525A

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

PERIOD

CANCEL
PERIOD

DAY

no.

SET
HEAT/COOL

SET
PRESENT
DAY/TIME

3. Press each key as listed below, and look for responses listed as key is held down and released. Keys may
be pressed in any order except RUN PROGRAM should
be pressed last because it ends self-test.

SET

HEAT or
AUTO
(with fan
in auto)

PRESENT
DAY/TIME

SET
PRESENT
DAY/TIME

3rd stage heating and AUX.
HT. LED also on.
3rd stage heating and AUX.
HT. LED off.
2nd stage heating also off.

SET
PRESENT
DAY/TIME

14
10

1st stage heating, fan and
SYSTEM LED also off.
Blank

Normal operating display

HOLD

OFF

TEMP

RUN
PROGRAM

A HEAT displayed when system switch is in HEAT, COOL
when in COOL, HEAT and COOL when in AUTO, neither
when in OFF. Also, a four-digit code is displayed. Explanation for each digit is following.

68-0076—1

T8611M
CHECKOUT • PROGRAMMING THE THERMOSTAT
First Digit
0
1
2
3

Degrees
F
F
C
C

Clock (Hrs.)
12
24
12
24

Third
Digit
0
1
4
5

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

Sensor
Location
Local
Local
Remote
Remote

M5346

Second Digit
0
1
2

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

Fourth
Digit
4
5

Nominal Cycle Rate
(cph at 50% load
for 3rd stage heat)
6
3

Programming The Thermostat
STEP 1
SETTING THE CURRENT DAY
AND TIME
This thermostat can be programmed
either on the wall or in the hand. See
page 12 to remove the thermostat from
the subbase.

SET
PRESENT
DAY/TIME

Press and release. The display shows
1:00 PM Mon.

PM
MON

M2701

DAY

Press and hold until the current day appears in the display.

PM
TUE

M2702

TIME

Always press the keys with fingertip or
similar blunt tool. Sharp instruments
like a pen or pencil point can damage
the keyboard.

AHEAD

Choose a day to program first. Monday
is used in the examples. Start by programming the MORNING time and
temperatures. The thermostat requires
a MORNING program every day. Set
additional programs as desired.

PM
TUE

M2703

BACK

NOTE: Check the glossary, page 30,
for definitions of unfamiliar words.

STEP 2
SETTING THE PROGRAM
TIMES AND TEMPERATURES
FOR ONE DAY

Press and hold until the current time appears in the display. Be sure AM or PM
appears as desired.
This completes setting the current day and
time. Go on to Step 2.

PERIOD

SET
HEAT/COOL

Press and release. Note that the display
shows MORNING and the preprogrammed
time and temperature.
If the display reads COOL, press and release to switch to HEAT.

AM
MON
MORNING

SET
PT

HEAT

M2704

AM
MON
MORNING

SET
PT

HEAT

M2704

DAY

Press and hold until MONDAY (or the
desired day) appears in the display.

AM
MON
MORNING

SET
PT

HEAT

M2704

T8611M
PROGRAMMING THE THERMOSTAT

AHEAD

Press and hold until the display shows the
time that the temperature should be at the
comfort setting.

AM
MON
MORNING

HEAT

M2705

BACK

WARMER

Press and hold until the display shows the
desired heating temperature.

SET
PT

AM
MON
MORNING

SET
PT

HEAT

M2706

COOLER

If the display flashes while holding down
TEMPERATURE
WARMER
or
COOLER, the setting limit has been
reached. If thermostat is an auto changeover
model, the heating temperature must be at
least 3 degrees below the air conditioning
temperature. For example, if the cooling
setting is 75° F, the maximum heating setting is 72° F. To set a higher heating temperature, first raise the cooling setting.
Program the MIDDAY time and heating temperature if desired.

PERIOD

Press and release. The display shows MIDDAY, but no time or temperature.

MON

AHEAD

Press and hold until the display shows the
time to start the energy saving period.

MON

SET
PT

MIDDAY

HEAT

AM
MIDDAY

HEAT

M2708

BACK

WARMER

SET
PT

Press and hold until the display shows the
desired temperature.

SET
PT

MON
MIDDAY

HEAT

M2709

COOLER

NOTE: It is possible to cancel any
period showing on the display except MORNING by pushing the
CANCEL PERIOD key. To move
to the next period while programming, simply press the PERIOD
key again.
Program the EVENING time and temperature, if desired.

PERIOD

AHEAD
BACK

WARMER

Press and release. The display shows
EVENING, but no time or temperature.
Press and hold until the display shows the
time the temperature should be at the comfort setting.

Press and hold until the display shows the
desired heating temperature.

SET
PT

MON
EVENING

HEAT

SET
PT

PM
MON
EVENING

HEAT

M2711

SET
PT

PM
MON
EVENING

HEAT

M2712

COOLER

68-0076—1

T8611M
PROGRAMMING THE THERMOSTAT

Program the NIGHT time and temperature, if desired.

PERIOD

AHEAD

Press and release. The display shows
NIGHT and the preprogrammed time and
temp-erature.
Press and hold until the display shows the
time to start the energy saving period.

SET
PT

PM
MON
NIGHT

HEAT

M2713

SET
PT

PM
MON
NIGHT

HEAT

M2714

BACK

WARMER

Press and hold until the display shows the
desired heating temperature.

SET
PT

PM
MON
NIGHT

HEAT

M2715

COOLER

SET

Set the cooling temperatures for all the
periods programmed. The program
times are the same for both heating and
cooling. Only the cooling temperatures
need to be programmed if programming has been completed for heating.
If you change program times for cooling, you are also changing the times for

heating.

WARMER

SET
PT

HEAT/COOL

MON

Press and release. The display shows
COOL, the preprogrammed cooling temperature and the programmed start time for
NIGHT.

NIGHT COOL

M2716

SET
PT

PM
MON
NIGHT COOL

COOLER

PERIOD

M2717

Press and hold until the display shows the
desired cooling temperature for NIGHT.
If the display blinks while holding down
TEMPERATURE
WARMER
or
COOLER, the setting limit has been
reached. If thermostat can switch automatically between heating and cooling, the
heating temperature must be at least 3 degrees F below the air conditioning temperature. For example, if the heating setting is 72° F, the minimum cooling setting
is 75° F. To set the cooling temperature
lower, first lower the heating setting.

AM
MON
MORNING

SET
PT

COOL

M2718

WARMER

Press and release. The display shows the
preprogrammed cooling temperature and
the programmed start time for MORNING.

AM
MON
MORNING

SET
PT

COOL

M2719

COOLER

PERIOD

Press and hold until the display shows the
desired cooling temperature for MORNING.

SET
PT

MON
MIDDAY

COOL

M2720

COOLER

Press and release. The display shows the
preprogrammed cooling temperature and
the programmed start time for MIDDAY.

PERIOD

Press and hold until the display shows the
desired cooling temperature for MIDDAY.

WARMER

SET
PT

MON
MIDDAY

COOL

M2721

SET
PT

ROOM

MON
EVENING

COOL

M2722

WARMER

COOLER

Press and release. The display shows the
preprogrammed cooling temperature and
the programmed start time for EVENING.
Press and hold until the display shows the
desired cooling temperature for EVENING.
This 22
completes the program schedule for
one day. Go to Step 3 to copy this program

SET
PT

ROOM

MON
EVENING

COOL

M2723

T8611M
PROGRAMMING THE THERMOSTAT
STEP 3
COPYING THE PROGRAM TO
THE DESIRED DAYS
It is possible to copy the program for
one day to any other day or combination of days. The new program will
replace any program already set in the
day selected.

PERIOD

If necessary, press and release to enter the
programming mode.

SET
PT

PM
MON
NIGHT

HEAT

M2724

DAY

Press and hold until the day containing the
program to be copied shows in the display.

SET
PT

PM
MON
NIGHT

HEAT

M2724

COPY
FROM

COPY
TO

DAY

COPY
TO

Press and release. The day to be copied will
show, and the next day will flash, in the
display.
Press and release to copy the program into
the day that is flashing in the display. Note
that the next day now starts to flash.

MON TUE

M2725

MON TUE WED

M2726

Press and release if it is not desired to copy
into the day that is flashing. Note that the
next day now starts to flash.

MON

Press and release the COPY TO key again
to select the day that is flashing, or the
DAY key to bypass it.

MON

Continue until all desired days are showing
in the display and are not flashing.

WED

M2727

WED THU

M2728

PM
TUE
MIDDAY

M2729

If an error is made in copying, start over by
pressing COPY TO key repeatedly until all
days are shown (not flashing); press COPY
TO key once more.

STEP 4
SETTING THE SCHEDULES
AND TEMPERATURES FOR
THE REMAINING DAYS
Use the procedures described in Steps
2 and 3 and summarized in this step to
program the remaining days.

RUN
PROGRAM

Press and release to copy the program into
all the days selected.

PERIOD

Press and release to enter the programming
mode.

SET
PT

TUE
MIDDAY

HEAT

M2730

DAY

Press and hold until the day desired to
program shows on the display.

SET
PT

FRI
MIDDAY

SET
HEAT/COOL

HEAT

M2731

If COOL shows on the display, press and
release to switch to HEAT.

SET
PT

FRI
MIDDAY

AHEAD

Use the AHEAD/BACK keys to set the
time and the WARMER/COOLER keys to
set the heating temperature.

BACK

PERIOD

HEAT

M2731

WARMER

COOLER

Press and release the PERIOD key to step
through the remaining time periods. Use the
AHEAD/BACK keys to set the time and the
WARMER/COOLER keys to set the heating temperature for each time period.

AHEAD

WARMER

BACK

COOLER

68-0076—1

T8611M
PROGRAMMING THE THERMOSTAT
SET
HEAT/COOL

Press and release so COOL shows on the
display.

PERIOD

SET
PT

FRI
MORNING

COOL

M2732

Press and release the PERIOD key to step
through the time periods, and use the
WARMER/COOLER keys to set the
cooling temperature for each period.

WARMER

COOLER

This completes the time and temperature
program for another day. Copy it into
additional days if desired.
COPY
FROM

COPY
TO

Press and release COPY FROM to enter
the copy mode. The next day flashes on
the display.
Press and release the COPY TO key to
select the day that is flashing, or the DAY
key to bypass it.

FRI SAT

M2733

SUN

FRI

M2734

DAY

COPY
TO

RUN
PROGRAM

Continue, using the COPY TO key to
bring up the next day, followed by COPY
TO to select, or DAY to bypass the DAY,
until all desired days are selected.
Press and release RUN PROGRAM to
complete the copy.

COPY
TO

DAY

PM
TUE
MIDDAY

M2735

Repeat Step 4 as needed until all days are
programmed.

STEP 5
SETTING THE SYSTEM AND
FAN SWITCHES ON THE
SUBBASE.

FAN ON: The fan runs continuously.
Use for improved air circulation during
special occasions or for more efficient
electronic air cleaning.

Depending on thermostat model, some
of the switch positions shown may not
be available. Note the positions provided on subbase, then set the switch(es)
as desired.

FAN AUTO: Normal setting for most
homes and businesses. The fan starts and
stops with the compressor in heat pump
systems when the system switch is set to
HEAT, AUTO or COOL. When system
switch is set to EM. HT., the fan operates
with the auxiliary heat (on some models).

First set the fan switch.
Then set the system switch.

FAN
ON AUTO
M2757

FAN
ON AUTO
M2758

EM. HT: The thermostat controls only
the backup heat. The heat pump is off.
EM. HT. HEAT OFF AUTO COOL
M2752

HEAT: The thermostat controls the heating system.
EM. HT. HEAT OFF AUTO COOL
M2753

OFF: Both the heating and cooling systems are off.
EM. HT. HEAT OFF AUTO COOL
M2754

T8611M
PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT
Then set the system switch. (continued)

AUTO (select models only): The thermostat controls either the heating or cooling system, depending on room temperature.

COOL: The thermostat controls the cooling system.

EM. HT. HEAT OFF AUTO COOL
M2755

EM. HT. HEAT OFF AUTO COOL
M2756

This completes the programming of the
thermostat.

Now, read on to learn about the operating flexibility that makes this thermostat THE SMART CHOICE.

If thermostat was removed from the wall
to program, replace it following the procedure on page 20.

Operating The Thermostat
TEMPORARILY CHANGING
THE PROGRAM
These features allow customizing the
program for those times when someone comes home early, is working late
or planning to be out for the evening.
Changes made with these keys are active for one program period and then
are canceled.
To keep the current temperature
through the next program period:

To go back to the temperature of the
previous program period:

SKIP
NEXT
PERIOD

CHANGE
TO LAST
PERIOD

Press and release. The name of the period
to be skipped will flash in the display
until the start time of the skipped period.
During the skipped period, the display
will flash “temporary” to show that the
programmed temperature for this period
is not being used.
Press and release. The display will show
the name of the previous period and flash
“temporary” until the next regularly
scheduled period starts.

SET
PT

PM
TUE
MIDDAY EVENING

M2736

SET
PT

PM
TUE

TEMPORARY

MORNING

M2737

IMPORTANT: The CHANGE feature will be operable the day after the thermostat has been
programmed and operating. The thermostat requires this time to learn the programmed
schedule.
To temporarily raise or lower the temperature for the current period only:

To change back:

COOLER

Press and hold until the desired temperature is reached. The display will flash
“tem-porary” until the next programmed
time period starts.

RUN
PROGRAM

Press and release to cancel any of the
temporary settings.

WARMER

SET
PT

TEMPORARY
HEAT

M2738

PM
TUE
MIDDAY

M2739

68-0076—1

T8611M
OPERATING THE THERMOSTAT
REPROGRAMMING THE
THERMOSTAT
If schedule changes or a different temperature is desired, update any setting
without affecting the rest of the program.

PERIOD

Press and hold until the desired time period
shows on the display.

DAY

Press and hold until the desired schedule
day shows on the display.

AHEAD
BACK

Copy the new program into other days,
if desired. When copying a program, all
the times and temperatures for that day

COPY
FROM

RUN
PROGRAM

HOLDING A TEMPERATURE
FOR EXTENDED ABSENCE
This feature is particularly useful when
going on vacation or other extended
absence. It does not cancel the pro-

HOLD
TEMP

Press and hold the Time or Temperature
keys until the display shows the desired
new program.

WARMER

COOLER

are copied.
Press and release. The next day will flash
on the display. Press COPY TO to copy
into, or DAY to bypass, the day. Continue
until the program has been copied into all
desired days.

COPY
TO

DAY

Press and release to return to normal operation.
gram.

SET
PT

HEAT

Press and release.

M2740
SET
PT

WARMER

COOLER

Press and hold to change the temperature
setting. After a few seconds, the display
will show the current temperature.

HEAT

M2741

PRESENT
SETTING

SET
PT

Press and release to check the temperature
setting.

HEAT

M2742

RUN
PROGRAM

PM
TUE
MIDDAY

M2743

Press and release to cancel manual control.

PERIOD

others can be canceled. Each time period
for each day must be canceled separately.

NIGHT

CANCELING PROGRAM
SETTINGS
The thermostat requires time and temperature settings in the MORNING time
period for each day, but any of the

HEAT

M2744

Press and hold until the desired time period
shows on the display.

SET
PT

PM
WED

DAY

NIGHT

HEAT

M2745
CANCEL
PERIOD

Press and hold until the desired day shows
on the display.

SET
PT

WED
NIGHT

Both the heating and cooling temperatures will be canceled.

SET
PT

PM
MON

RUN
PROGRAM

Press and release to cancel the time and
temperature settings for that time period.
ber: all the programs will be copied, not
just the cancellation.

HEAT

M2746

PM
WED
EVENING

HEAT

M2747

Use the copy function to cancel the
program from other days, but remem-

T8611M
OPERATING THE THERMOSTAT • OPERATION
Press and release to return to normal
operation.

without affecting the permanent program.
Press and hold until the desired period shows
on the display. The start time and temperature setting will appear on the display.

CHECKING THE PROGRAM
TIMES AND TEMPERATURES
If desired, check all the stored settings

FRI
NIGHT

PRESENT
SETTING

SAT
NIGHT

Press and release to display the next day
time and temperature for that period.

HEAT

M2749
SET
PT

Press and release to return to normal opera-

Press a single key to compare actual
room temperature to the setting at any

SET
PT

RUN
PROGRAM

CHECKING THE CURRENT
TEMPERATURE SETTING

HEAT

M2748

DAY

tion.

SET
PT

PERIOD

FRI
EVENING

M2750

time.

SET
PT

Press and release. The display will show
the current temperature setting for several
seconds, then revert to the room temperature.

HEAT

M2751

During recovery from energy savings, the
setting displayed will not match the programmed setting. This is because the thermostat gradually changes the temperature
setting during recovery to provide maximum comfort combined with most efficient use of the heating or cooling equipment.

Operation

The T8611M Thermostat provides automatic control of
multistage heat pump systems with up to three stages of
heat and up to two stages of cool. The first heat stage is the
heat pump and the last stage is electric, gas, or oil auxiliary
heat. T8611M provides automatic changeover from heat
to cool or cool to heat.

the weather conditions and the building heating/cooling
system.
The advantages are:

ADAPTIVE INTELLIGENT RECOVERY™
OPERATION
Adaptive Intelligent Recovery™ is the Honeywell trademark for the way the T8611 controls the heating and
cooling equipment during recovery from an energy savings setting to a comfort setting. During recovery, the
control point changes gradually rather than jumping from
the energy savings setting to the comfort setting all at once.
This provides additional energy savings.
When Adaptive Intelligent Recovery™ is used in the
heating mode, the control point raises gradually, maximizing the use of the more economical heat pump to bring the
sensed temperature to the desired comfort setpoint. This
minimizes the use of the typically more expensive auxiliary heat.
In both heating and cooling, the thermostat monitors
recovery each day and adjusts the next day recovery start
time. This ensures that the building is at the desired
temperature at the programmed time, regardless of the
outdoor temperature. Recovery time varies depending on

• Drafts from low temperature discharge air are minimized during occupied periods.

• The comfort setting is achieved at the programmed
time and maintained regardless of weather conditions; occupants come home and wake up to comfort.

• The thermostat automatically uses the more economical heat pump as the primary heat source during heat mode recovery, avoiding the use of the
expensive auxiliary heat.
• Comfort and energy savings can be achieved in both
heating and cooling.
• Reduces heat pump compressor cycling, extending
equipment life.
Use of Outdoor Thermostats
Because Adaptive Intelligent Recovery™ calls for auxiliary heat only when it is truly needed, it eliminates the
need for outdoor thermostat(s). If an outdoor thermostat is
used with T8611 and it is set close to the balance point, the
recovery time from energy savings will be prolonged
because the outdoor thermostat will prevent operation of

68-0076—1

T8611M
OPERATION
the auxiliary heat even when the T8611 is calling for it.
(Balance point is the outdoor temperature below which the
heat pump must call on auxiliary heat to help handle the
load.) The resulting unnecessarily long recovery times
reduce building energy savings.

cycles even during the energy savings period. When recovery from energy savings begins, the heat pump will
stay on and auxiliary heat will cycle. During recovery, the
auxiliary heat ON times will be long, and the OFF times
will be short. The ON times will shorten as the control
point approaches the comfort setpoint. During the comfort
period, the heat pump is on continuously and auxiliary heat
cycles until the next energy savings period. When energy
saving begins, the heat pump cycles off until the sensed
temperature falls below the control point. Although the
heat pump comes on when the sensed temperature falls
below the control point, the sensed temperature may lag 2°
or 3° F below the control point because of the time required
to warm up the walls and furniture. Auxiliary heat will
cycle as necessary during the energy savings period.

When Adaptive Intelligent Recovery™ Is Used
Adaptive Intelligent Recovery™ is used during recovery from energy savings. It is bypassed when the setpoint
is changed, and when the CHANGE TO LAST PERIOD,
SKIP NEXT PERIOD or HOLD TEMP key is pressed. If
Adaptive Intelligent Recovery™ is bypassed, the system
operates the stages of equipment like a conventional thermostat.
WHAT TO EXPECT DURING RECOVERY
FROM ENERGY SAVINGS IN HEATING
The T8611 controls the heating equipment based on the
indoor sensed temperature, which is a combination of air
temperature and wall temperature.

THERMAL PERFORMANCE WITH T8611
During severe weather, the T8611 actually controls
closer to the setpoint than a conventional thermostat. This
is because the heat anticipator is replaced by two electronic control strategies—cycling by heat anticipation and
proportional plus integral control.
Electronic cycling by heat anticipation acts like a traditional heat anticipator, except that never needs adjustment
for various control circuit load currents. It cycles the heat
pump off slightly before the room temperature reaches the
setpoint to keep heat remaining in the ductwork from
overheating the room.
In severe weather, a conventional thermostat with a
heat anticipator tends to turn off the thermostat too soon,
so the effective control point is somewhat below the
setpoint. In very cold weather, the difference between
setpoint and effective control point may be 5° or 6° F [2°
or 3° C] with a conventional thermostat. This phenomenon
is called droop.
Proportional plus integral action eliminates droop by
adjusting the on-time of the stage that is cycling longer or
shorter until the control point matches the setpoint. The
T8611 controls space temperature within one degree of
setpoint, when the temperature has stabilized after an
energy savings period.
This zero droop performance of the T8611 provides
improved occupant comfort and energy savings. Occupants do not need to continually adjust thermostat setting
to maintain desired temperature, even during severe
weather.

In Mild Weather
When the outdoor temperature is mild, say 50°F [10°
C], the recovery from energy savings will be handled
completely by the heat pump, without using the more
costly auxiliary heat. The heat pump starts only after the
control point has risen above the sensed temperature and
is locked on until the comfort setpoint is reached. During
the comfort period, the heat pump will cycle on and off as
needed to maintain the sensed temperature within +/-1° F
of the setpoint. During energy savings periods, the T8611
will call the heat pump on only if the sensed temperature
falls below the control point.
In Moderate Weather
When outdoor temperature is below the balance point
of the heat pump, the heat pump will run continuously
during the recovery period and the auxiliary heat will cycle
as necessary. During the comfort period, the heat pump
runs continuously and auxiliary heat cycles until the next
energy savings period begins. During energy savings, the
heat pump cycles on only when the sensed temperature
falls below the control point. Under these conditions,
auxiliary heat is typically not needed during the energy
savings period.
In Severe Weather
When the outdoor temperature is severe, say 0° F [-18°
C], the heat pump is on continuously and auxiliary heat

MINIMUM-OFF TIMING
A minimum-off timer in the T8611 ensures that the
compressor will not come on again for at least five minutes
after it turns off. The minimum-off timer is triggered when
the compressor goes off, or when the system switch is
moved. If the compressor turns off when the setpoint is
changed or the CHANGE TO LAST PERIOD key is
pressed, then the minimum-off timer is triggered. The
minimum-off timer operates during the first stage of both
heating and cooling.

T8611M
TROUBLESHOOTING

Troubleshooting
Start the system by setting the thermostat and observing system response. If problem occurs, establish symptom and use
the following troubleshooting chart to check for possible cause and action.
S YMPTOM
HEAT PUMP OR AUXILIARY HEAT
WON'T OPERATE

POS S IBLE C AU S E

AC TION
CHECK POWER TO HEAT PUMP OR
AUXILIARY HEATING SYSTEM
–ON-OFF SWITCH
–FUSE OR CIRCUIT BREAKER
–LOOSE 24 V CONNECTION
-AT THERMOSTAT
-AT HEAT PUMP OR AUXILIARY HEATING SYSTEM
–INCORRECT WIRING
-CHECK WIRING DIAGRAM

NO ac POWER TO THERMOSTAT

THERMOSTAT INOPERATIVE

CONDUCT SELF-TEST; SEE CHECKOUT.

PRESENT SETTING TOO LOW/HIGH

ADJUST TEMPERATURE BY PUSHING WARMER/COOLER
KEYS.

SYSTEM SWITCH ON THERMOSTAT IN
WRONG POSITION

RESET THERMOSTAT SYSTEM SWITCH.

MINIMUM-OFF TIMES IN THERMOSTAT IN
OPERATION ON COOLING OR HEATING

WAIT 5-10 MIN. OR USE SELF-TEST IN THERMOSTAT.
SEE CHECKOUT.

INCORRECT WIRING

CHECK CIRCUIT DIAGRAM.

HEAT PUMP OR AUXILIARY HEAT SYSTEM
INOPERATIVE

CONSULT HEAT PUMP/AUXILIARY HEAT SYSTEM
INSTRUCTIONS.

PARTIAL DISPLAY

INOPERATIVE THERMOSTAT

REPLACE THERMOSTAT.

NO DISPLAY

NO POWER TO THERMOSTAT

CHECK THAT HEAT OR COOL SYSTEM POWER IS ON.

THERMOSTAT IN SELF-TEST MODE

THERMOSTAT MOUNTED INCORRECTLY
ON BASE

PRESS RUN PROGRAM KEY TWICE.

SEE INSTALLATION INSTRUCTIONS FOR CORRECT
MOUNTING.

PRESENT SETTING APPEARS
INACCURATE

THERMOSTAT IS IN RECOVERY MODE

ROOM TEMPERATURE DISPLAY
APPEARS INACCURATE

THERMOSTAT HAS SEPARATE REMOTEMOUNTED SENSOR

ROOM TEMPERATURE IS NOT WHAT
IS EXPECTED ON WEEKENDS

THERMOSTAT NOT PROGRAMMED FOR
WEEKENDS

REPROGRAM FOR WEEKENDS PER INSTRUCTIONS.

THERMOSTAT TEMPERATURE
NEEDS TO BE ADJUSTED ON A
REGULAR BASIS

WARMER/COOLER KEYS BEING USED
TO ADJUST TEMPERATURE

REPROGRAM THERMOSTAT TO MAKE PERMANENT
CHANGE IN PROGRAM. WARMER/ COOLER KEYS ARE
TEMPORARY UNLESS PERIOD KEY IS PRESSED FIRST.

PROGRAM IS LOST DUE TO POWER
OUTAGE OR DISPLAY GOES BLANK
WHEN POWER IS TURNED OFF

BATTERIES ARE INCORRECTLY INSTALLED

REMOVE AND REPLACE PER MARKINGS ON THERMOSTAT.

BATTERIES ARE DEAD

REPLACE BATTERIES.

IMPROPER PROGRAM SEQUENCE

CHECK HOMEOWNERS MANUAL FOR CORRECT PROGRAM
SEQUENCE.

AUTOMATIC CHANGEOVER THERMOSTAT
HEATING OR COOLING TEMPERATURES
CAN NOT BE SET CLOSER THAN 3°F

SET HEATING AND COOLING TEMPERATURES 3°F OR
MORE APART.

PROGRAMMING HAS BEEN LOST BECAUSE OF
A POWER OUTAGE

REPROGRAM ACCORDING TO PROGRAMMING
INSTRUCTIONS (MAKE SURE BATTERIES ARE INSTALLED).

DISPLAY FLASHES WHILE
PROGRAMMING

DISPLAY FLASHES DURING
OPERATION

• NORMAL OPERATION THERMOSTAT TURNS ON
HEATING/COOLING EARLY TO MEET TEMPERATURE
SETTING AT PROGRAMMED TIMES.
• RECOVERY CAN BE ENDED BY PUSHING
WARMER/COOLER KEYS.
• THERMOSTAT IS CONTROLLED BY TEMPERATURE SENSED
AT REMOTE SENSOR LOCATION.
• CHECK TEMPERATURE AT REMOTE SENSOR LOCATION.
• MAKE SURE WIRING FROM THERMOSTAT LOCATION TO
REMOTE SENSOR LOCATION IS IN GOOD CONDITION.

M1020A

68-0076—1

T8611M
GLOSSARY

Glossary
AUX. HT. light (green)
This light glows whenever the thermostat is calling for
operation of the backup 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 (located on subbase).

conditioning equipment to return the building from the
energy saving temperature to the comfort temperature.
The thermostat starts the recovery period early so the
building will be at the comfort setting by the time the
owner has chosen.
Setback
Reducing the temperature in the building for a set period
in heating for energy savings. The lower temperature is the
energy savings temperature.

CHECK light (yellow)
Consult heat pump literature to determine its meaning
(located on subbase).
Comfort temperature
The temperature desired when active and occupying the
building.

Setup
Raising the temperature in the building for a set period in
cooling for energy savings. The higher temperature is the
energy savings temperature.

EM. HT. light (red)
This light glows whenever the thermostat system switch is
in the EM. HT. position (located on subbase). On some
systems, it may also indicate the need to switch to EM. HT.
because of a heat pump problem.

Setpoint
The thermostat temperature setting the owner selects. The
thermostat turns the heating or cooling equipment on and
off to maintain this temperature at the thermostat location
until another temperature setting (setpoint) goes into effect.

Energy-saving temperature
The lower (heating) or higher (cooling) temperature that
allows savings on heating and cooling costs when asleep
or away. Also called the setback (heating) or setup (cooling) temperature.

SYSTEM light (yellow)
This light glows whenever the thermostat is calling for
heating or cooling (located on thermostat).

Preprogrammed schedule
This is the schedule programmed into the thermostat at the
factory. It sets a night program that provides energy
savings if owner does not set his/her own program, or if
personal program is lost for any reason. The program,
which is the same for all days of the week, is:
Period
MORNING
MIDDAY
EVENING
NIGHT

Start
Time
6:00 AM
- - - - - -No
- - - - - -No
10:00 PM

Time period
One of four program periods: MORNING, MIDDAY,
EVENING, and NIGHT; available with the Chronotherm III™ Thermostat. One period begins when the
previous program period ends.
MORNING—The time period when the owner brings
the building to a comfortable temperature to begin the
day. This is the only period that must contain a time and
temperature for every day.

Temperature
Heating
Cooling
70° F
78° F
program - - - - - - - - - program - - - - - - - - - 60° F
78° F

MIDDAY—The time period when the owner can set
back (heating) or set up (cooling) the temperature for
daytime energy savings if the building is unoccupied.
EVENING—The time period when the owner wants
the building at a comfortable temperature for evening
activities after daytime energy savings.

Program
The times and temperatures the owner sets to define the
comfort and energy saving periods for each day’s schedule.

NIGHT—The time period when the owner can set
back (heating ) or set up (cooling) the temperature for
energy savings because family members are asleep or
the building is unoccupied. Often a NIGHT energy
savings temperature is set only for the heating season so
family members can sleep cool in summer.

Recovery
The time when the thermostat operates the heating or air

T8611M
TABLE OF CONTENTS

Table of Contents
Page
Specifications .................................................................................................................................................................... 2
Ordering Information ...................................................................................................................................................... 2
Selection/Application ....................................................................................................................................................... 5
Installation ...................................................................................................................................................................... 12
Compatibility ............................................................................................................................................................. 12
Location ...................................................................................................................................................................... 12
Mounting Subbase ..................................................................................................................................................... 12
Mounting Remote Temperature Sensor ................................................................................................................. 13
Wiring ......................................................................................................................................................................... 13
Adjusting Cycle Rate ................................................................................................................................................ 17
Installing Batteries .................................................................................................................................................... 17
Power Outages ........................................................................................................................................................... 17
Mounting the Thermostat ......................................................................................................................................... 17
Setting Day and Time ................................................................................................................................................ 17
Checkout .......................................................................................................................................................................... 18
Heating ........................................................................................................................................................................ 18
Cooling ........................................................................................................................................................................ 18
Fan ............................................................................................................................................................................... 19
Installer Self-Test ...................................................................................................................................................... 19
Programming The Thermostat ..................................................................................................................................... 20
Setting the Current Day and Time .......................................................................................................................... 20
Setting the Program Times and Temperatures for One Day ............................................................................... 20
Copying the Program to the Desired Days ............................................................................................................. 23
Setting the Schedules and Temperatures For the Remaining Days ..................................................................... 23
Setting the System and Fan Switches on the Subbase ........................................................................................... 24
Operating The Thermostat ........................................................................................................................................... 25
Temporarily Changing the Program ....................................................................................................................... 25
Reprogramming the Thermostat ............................................................................................................................. 26
Holding a Temperature for Extended Absence ..................................................................................................... 26
Canceling Program Settings ..................................................................................................................................... 26
Checking the Program Times and Temperatures ................................................................................................. 27
Checking the Current Temperature Setting .......................................................................................................... 27
Operation ........................................................................................................................................................................ 27
Adaptive Intelligent Recovery™ Operation ........................................................................................................... 27
What To Expect During Recovery From Energy Savings Heating ..................................................................... 28
Thermal Performance With T8611 ......................................................................................................................... 28
Minimum-Off Timing ............................................................................................................................................... 28
Troubleshooting .............................................................................................................................................................. 29
Glossary ........................................................................................................................................................................... 30

68-0076—1

Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422

Printed in U.S.A.

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

Helping You Control Your World

QUALITY IS
KEY

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.3
Linearized                      : Yes
Encryption                      : Standard V4.4 (128-bit)
User Access                     : Print, Copy, Extract, Assemble, Print high-res
XMP Toolkit                     : Adobe XMP Core 4.0-c316 44.253921, Sun Oct 01 2006 17:14:39
Create Date                     : 1998:01:27 13:45:05Z
Creator Tool                    : Adobe PageMaker 6.52
Modify Date                     : 2007:05:07 14:15:41-05:00
Metadata Date                   : 2007:05:07 14:15:41-05:00
Format                          : application/pdf
Description                     : Product Data
Creator                         : H&BC TECHNICAL COMMUNICATIONS
Title                           : 68-0076 - T8611M (7-Day Programming) Chronotherm lll Heat Pump Thermostats
Keywords                        : 
Producer                        : Acrobat Distiller 3.0 for Power Macintosh
Document ID                     : uuid:fd980859-3a80-4f47-b12f-cca299c48679
Instance ID                     : uuid:f22c8982-ca26-4f41-b72e-6ed3ea7c9d36
Page Count                      : 32
Subject                         : Product Data
Author                          : H&BC TECHNICAL COMMUNICATIONS

EXIF Metadata provided by EXIF.tools

Honeywell Chronotherm Iii T8611M Users Manual 68 0076 (7 Day Programming) Lll Heat Pump Thermostats

CHRONOTHERM T8621A 68-0076

T8611M to the manual cf62be26-c807-46f8-a239-45dd5c6d4914

Navigation menu

Versions of this User Manual:

Views

Navigation