T8611M
(7-Day Programming)
Chronotherm III™
Heat Pump Thermostats
The T8611M Chronotherm III Programmable
Thermostat provides automatic control of multi-
stage heat pump systems and offers users the
highest standard of comfort and convenience
available with energy savings.
■ Fullseven-dayprogramcapability;differentsched-
stat indicates system is energized.
ules may be selected for every day.
■ AUX. HT., EM. HT., CHECK LEDs available on
■ Can be programmed in hand (with batteries in-
stalled) or on the wall to provide up to four tem-
perature periods per day.
select models.
■ Automatic heat/cool changeover.
■ Batteriesincludedprovidepowertomaintainclock
■ Large digital clock (liquid crystal display) indi-
cates continuous time-of-day, day-of-week, cur-
rent period and room temperature.
and memory during power failures.
■ Switchingsubbasewithwiringterminalsincluded.
■ Powered directly from control transformer.
■ Model available with separate sensor for remote
■ AdaptiveIntelligentRecovery™bringsroomtem-
perature to programmed temperature at program-
med time, maximizing comfort and energy sav-
ings.
■ Temperature control program maintains tempera-
ture within 1° F of setpoint.
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
■ Temporaryprogramoverrideavailablebyusing—
—WARMER and COOLER keys.
—SKIP next period key.
—CHANGE to last period key.
■ HOLDTEMPkeyprovidedforindefiniteprogram
override (vacation/holiday).
■ Installer self-test with time delay override saves
installation time.
■ SYSTEM light-emitting diode (LED) on thermo-
temperature sensing.
C. H. • Rev. 10-92 • ©Honeywell Inc. 1992 • Form Number 68-0076—1
T8611M
SPECIFICATIONS
Fig. 1—T8611 Subbase mounting dimensions in in. [mm].
31
32
1
[50]
13
1
16
[46]
3
32
4
[104]
5
5
16
[135]
5
16
3
[83]
3
4
4
[121]
7 [179]
M5181A
Fig. 2—202905AA Remote Sensor dimensions in in. [mm].
FRONT
SIDE
BACK
2
31
1
[51]
32
[50]
31
32
[50]
1
19
[8]
64
3
32
4
41
64
[16]
9
64
[104]
[4]
1
3
8
1
[35]
DIA.
2
[13]
[25]
1
M5244
3
68-0076—1
T8611M
SPECIFICATIONS
Fig. 3—Typical thermostat keypad.
SYSTEM
AM
ROOM
WED
HEAT ON
MIDDAY
TEMPERATURE
PRESENT
SETTING
RUN
PROGRAM
TIME
SKIP
SET
COPY
FROM
NEXT
PRESENT
DAY/TIME
PERIOD
WARMER
COOLER
DAY
AHEAD
PERIOD
CHANGE
TO LAST
PERIOD
BACK
SET
HEAT/COOL
HOLD
TEMP
CANCEL
PERIOD
COPY
TO
FAN
COOL
HEAT
OFF
ON
AUTO
M5360
4
T8611M
SELECTION/APPLICATION
Selection/Application
The T8611 Thermostat uses the latest microelectronic
design and control technology to provide home and build-
ing 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 appli-
cation of the best thermostat to meet individual customer
needs.
IF RETROFIT/REPLACEMENT APPLICATION,
CONSIDER
• equipment requirements
— systemswitching(manual:EM.HT.-HEAT-OFF-
COOL,automatic:EM.HT.-HEAT-OFF-AUTO-
COOL).
— unique heat pump functions of emergency or
supplemental heat, changeover on heat or cool,
and status indication.
PROGRAMMING
— Table 3 lists typical applications by manufac-
turer.
Does the thermostat selected accommodate the
customer’s daily schedule, lifestyle or work schedule?
Refer to choices below.
• existing wiring
— Arethereenoughconductorstooperatetheequip-
ment and the thermostat? Can a new cable be
pulled?
TRADELINE
Device
Daily Temperature
Selection
Programming
T8611G,R*
Weekday,
Sat, Sun.
4 heat and
4 cool
• existing thermostat
— Table3isaguideforreplacingpopularHoneywell
standard nonprogrammable thermostats with a
T8611.
T8611M
7-day
(each day
different)
4 heat and
4 cool
SECURITY
Does the thermostat selected provide access to pro-
gramming and the override features that will best suit the
application? Refer to choices below.
Typical
Application
Access
Device
*Specifications form 68-0057 for information.
Free access to
programming
and adjustment/ commercial
Home or
owner-occupied
T8611
IF NEW CONSTRUCTION APPLICATION,
CONSIDER
override.
building.
• equipment type (see manufacturer’s specifications)
— system switching required
— status indication provided
• control wiring—number of conductors required to
operate equipment and thermostat.
Restricted
access to
device.
Public building. T8611 with TG512
Locking Cover;
T8611 with remote
temperature
sensing.
IMPORTANT: The T8611 requires a conductor to trans-
former common to provide continuous 24V power
for thermostat operation. This feature is commonly
specified and provided by equipment manufacturer.
5
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
COMMENTS
Heating Stages
Cooling Stages
3
2
May be applied to 2-stage heat pump systems; see wiring
diagrams Figs. 6 and 7.
Changeover
Auto
7-day
Yes
Programming
SYSTEM LED
Lights on call for heat or cool.
EM. HEAT LED (red)
AUX. HEAT LED (green)
CHECK LED (yellow)
Yes
Lights continuously in EM. HEAT mode.
Lights during call for final auxiliary heat stage.
Field wired option; indicates equipment malfunction.
Yes
Yes
Remote Temperature
Sensing
Yes
Available on T8611M7040 only. (202905A Remote Sensor
included).
WIRING TERMINAL
FUNCTION
24 Vac Common
C
Must be connected to control transformer to operate
thermostat.
24 Vac Power
R
Y
Compressor, Stage 1
heat and cool.
Compressor,
Stage 2 cool
Y2
If applying T8611M to 1-stage cooling system, leave Y2
unconnected.
Second Stage Heat
Auxiliary (Resistive)
Third Stage Heat
W2
W3
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.
Fan
G
B
Changeover Heat Mode
O/B changeover terminals are energized continuously
following first call for cool or heat, respectively.
Changeover Cool Mode
O
L
System Monitor,
Energizes EM. HEAT LED when externally powered.
continuously energized
in EM. HEAT mode.
Emergency Heat
energized on call for
stage 1 heat in
E
EM. HEAT mode
Check LED terminals
to indicate equipment
malfunction
X1
S1
X2
S3
See wiring diagrams for hookup alternatives.
Remote Temperature
Sensing
S2
Available on T8611M7040 only. Must be connected to
202905A Remote Sensor for proper thermostat operation.
6
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
Weekday,
Sat, Sun
Changeover
Weekday,
Sat, Sun
Auto
Changeover
7-day
T8611G1004
T8611R1000
T8611G1012 (° C) T8611R1042 (° C)
T8611G1103 T8611R1141
T8611M7008
c
(Premier White) (Premier White) T8611M7040 Thermostat Subbase Thermostat Subbase
(also see form 68-0057, Specifications)
T874
Q674
T872
Q672
Comments
Amana
•
•
•
D1009
D1017
D1165
F1022
D1003
D1011
D1300
F1026 Separate first stage
heat/cool terminals W1, Y1.
Arco/Comfort Maker
a
•
•
•
•
•
•
•
na na
na
na
na
na
Check LED optional;
X = X1, jump X2 to C.
Arco/Friedrich
na na
a
Changeover on heat,
check LED optional.
Bard
a
•
•
•
•
N1024
R1129
F1261
L1181
N1036
R1146
F1299 Changeover on heat (typical),
L1185 checkLEDoptional,equipment
terminal W1 to thermostat B.
•
Bryant, Day-Night, Payne
G1451 F1113b G1166
b
a,b
a
b
•
•
•
•
F1125 Check LED optional; F = X1,
jump X2 to C. Note: P terminal
•
•
•
•
G1261
J1010
F1253
L1371
a
•
G1174
available
on
manual
changeover
•
a
•
•
R1335
Carrier
L1405
(T8611R) models only.
a
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
G1055
G1071
G1121
J1035
L1041
L1397
P1005
G1075
G1158
G1182
G1273
G1307
G1257
J1054 Check LED optional (typical)
L1052
•
•
•
•
•
•
•
L1169
J1002
J1028
D1074
L1371
L1074
F1059
F1030
F1063
E1114
E1042
L1116
Multistage heat pump
No Supl. Ht. function
No Supl. Ht. function
Multistage heat pump
D1264
Command Aire
•
•
•
•
•
•
H1005 C1041
G1352 C1066
H1009 C1086 No AUX. HEAT or EM.
HEAT required; Y1 = 0
a No CHECK LED.
b Dual transformer requires conversion to single transformer.
c Model includes separate sensor for remote temperature sensing.
(continued)
68-0076—1
7
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
Weekday,
Sat, Sun
Changeover
Weekday,
Sat, Sun
Auto
Changeover
7-day
T8611G1004
T8611R1000
T8611G1012 (° C) T8611R1042 (° C)
T8611G1103 T8611R1141
T8611M7008
c
(Premier White) (Premier White) T8611M7040 Thermostat Subbase Thermostat Subbase
(also see form 68-0057, Specifications)
T874
Q674
T872
Q672
Comments
Coleman
a
•
•
•
•
•
R1368
L1421
na
na
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.
•
na
na
na
na
Crispaire/Marvair
•
•
•
•
•
•
G1089
F1162
F1204
L1215
G1208
R1156
F1166
F1323
L1094
R1111
Fedders/Airtemp/Climatrol
a
•
•
•
C1398
C1406
C1414
L1090
C1509
C1517
C1541
L1102 Separate first stage heat/cool
terminals required; check LED
optional; equipment terminal
K to thermostat E.
a
a
Florida Heat Pump
na na
a
•
•
•
na
na
Optional check LED;
X = X1, jump X2 to C.
Heatwave/Southwest Mfg.
G1105 F1170 G1232
Heil Quaker/Whirlpool/Tempstar
•
•
•
•
•
F1224
•
R1137
L1132
R1172
L1193 Equipment terminal B
to thermostat C.
Honeywell
•
•
•
•
•
•
•
•
•
•
•
•
A-D (typ.) F1006 A-D (typ.) F1000 Separate first stage
F1022
F1048
F1089
F1026 heat/cool terminals.
F1042
F1075
C1000
C1018
C1117
C1240
G1246
G1444
C1004
C1038
C1350
C1566
G1224
G1000
G1018
G1083
•
•
•
•
•
•
•
•
°C
°C
•
•
•
•
•
F1212
F1238
F1208 TRADELINE
F1018
°C
F1158
G1212
G1139
a No CHECK LED.
b Dual transformer requires conversion to single transformer.
c Model includes separate sensor for remote temperature sensing.
(continued)
8
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
Weekday,
Sat, Sun
Changeover
Weekday,
Sat, Sun
Auto
Changeover
7-day
T8611G1004
T8611R1000
T8611G1012 (° C)T8611R1042 (° C)
T8611G1103 T8611R1141
T8611M7008
c
(Premier White) (Premier White) T8611M7040 Thermostat Subbase Thermostat Subbase
(also see form 68-0057, Specifications) T874 Q674 T872 Q672
Comments
Honeywell (continued)
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
N1016
N1040
R1004
F1220
F1261
B1042
B1109
L1207
L1157
L1181
N1002
N1028
R1008
R1057
R1198
F1133 Changeover on heat; equip-
F1216 ment terminal C to thermostat
B1046 Y, W1 to B, K to E.
L1037
R1152
R1285
R1350
L1227
Janitrol/Tappan
•
•
•
G1147
F1139
G1109
F1117 Equipment terminal C to
thermostat C.
Lennox
NOTE: Rewire for single 75
VA
transformer if two-transformer
system.
F1067
E1019 °C
DoD specs—use guard.
L1201
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
G1014
G1022
G1162
G1154
R1024
R1040
R1178
F1113
E1148
G1026
G1125
G1091
G1323
F1105
B1160
B1202
L1355
L1165
L1165
L1199
L1389
C1148
D1207
Two-speedunit;optionalcheck
LED; thermistor A not used.
minal Conversion
Ter-
Guide:
Lennox Standard
Transformer
Common
Transformer
Power
X
C
VR (in)
R
V (out)
Compressor
M
M2
Y
F
R
L
E
Y
Y2
W2
G
O
L,X1,X2
E
Aux. Heating
Fan
Changeover
System Monitor
Em.Heat (cycling)
Thermistor
A
T (not
required)
(continued)
a
No CHECK LED.
b Dual transformer requires conversion to single transformer.
9
68-0076—1
c Model includes separate sensor for remote temperature sensing.
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
Weekday,
Sat, Sun
Changeover
Weekday,
Sat, Sun
Auto
Changeover
7-day
T8611G1004
T8611R1000
T8611G1012 (° C)T8611R1042 (° C)
T8611G1103 T8611R1141
T8611M7008
c
(Premier White) (Premier White) T8611M7040 Thermostat Subbase Thermostat Subbase
(also see form 68-0057, Specifications)
T874
Q674
T872
Q672
Comments
Luxaire
•
•
•
•
G (Borg F1188
Warner)
Magic Chef
G1315
F1281
•
na
na
na
na
na
na
na
Earlier PB series, separate first
stage heat/cool.
Late PE series, optional check
LED; X1 = X1, jump X2 to R.
a
•
•
na
Rheem/Ruud
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
G1097
G1238
F1238
G1133
G1141
R1081
R1107
F1158
L1157
L1045
L1136
G1220
R1079
R1095
Square D/Sun Dial
a
•
C1224 F1071
C1525
F1182 Separate first stage heat/cool
required; optional check LED;
X = X1, jump X2 to R.
Trane/General Electric
G1204 J1043
a
•
•
•
•
G1059
J1039 Optional check LED; F = X1,
jump X2 to C; T not used;
equipment terminal B to ther-
mostat 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
•
•
G1265
F1265 Optional check LED; X = X1,
jump X2 to R; equipment ter-
minal C to thermostat C, W1
to Y (W1 + Y1), E to W2,
Y1 to 0.
a
No CHECK LED.
b Dual transformer requires conversion to single transformer.
c Model includes separate sensor for remote temperature sensing.
(continued)
10
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
Weekday,
Sat, Sun
Changeover
Weekday,
Sat, Sun
Auto
Changeover
7-day
T8611G1004
T8611R1000
T8611G1012 (° C)T8611R1042 (° C)
T8611G1103 T8611R1141
T8611M7008
c
(Premier White) (Premier White) T8611M7040 Thermostat Subbase Thermostat Subbase
(also see form 68-0057, Specifications)
T874
Q674
T872
Q672
Comments
Wesco/Addison
•
•
•
G1287
F1253
EquipmentterminalC1tother-
mostat C, W1 to Y (W1 + Y1),
•
•
•
•
•
•
•
•
•
R1012
B1109
R1016
G1265
G1281
B1103 Y1to0. Commontothermostat
F1265 directfromcontroltransformer.
Westinghouse
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
G1048
F1121
G1034
F1141
F1091
F1257
J1013
J1062
L1110
L1128
L1151
F1246
F1279
J1019
J1050
L1108
L1173
R1103
R1149
na
na
na
na
Separate first stage heat/cool
minals required.
ter-
•
D1108
L1223
G1356
L1219 2-speed heat pump; optional
check LED; L = X1, jump
X2 to C.
White Rodgers
•
•
•
na
na
na
na
1F58-910/S28 series.
Williamson
•
•
•
•
•
•
R1236
N1008
L1348
F1196
na
na
na
na
Changeover on heat; W1 = B.
York/Borg Warner
a
•
•
•
•
•
•
•
•
•
G1170
G1295
G1345
J1027
F1311
L1363
G1042
G1299
J1021 Optional check LED; X = X1,
L1177 jump X2 to C; equipment ter-
•
•
•
G1331 D1077 minal B to thermostat C,
G1402 D1032 G1364
W to W2, H to B, T not re-
quired.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
G1410
G1428
G1436
R1046
R1169
R1251
G1398
L1017
L1330
L1272
R1032
L1011
Zone Aire
•
•
•
•
•
•
N1040
R1350
F1261
L1181
Changeover on heat;
W1 = B.
a
No CHECK LED.
b Dual transformer requires conversion to single transformer.
c Model includes separate sensor for remote temperature sensing.
11
68-0076—1
T8611M
INSTALLATION
Installation
COMPATIBILITY
This thermostat requires a single transformer. A two-
transformer system may require turning off two switches
or disconnects, and rewiring to run the thermostat from a
single transformer. Make sure the transformer has ad-
equatepower(VA)fortheheating/coolingcontrolsystem.
Add current ratings of the system components (such as
auxiliaryheatrelay, changeoverrelay, fanrelay). 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.
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 compat-
ible with almost any low-volt control system.
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 tech-
nician.
IF NEW INSTALLATION
4. Allow thermostat to warm to room temperature
before operating.
5. After installation is complete, check out product
operation as provided in these instructions.
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 ther-
mostat cable with at least one conductor for each wiring
terminal is recommended. Good service practice recom-
mends 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—
MOUNTING SUBBASE
IMPORTANT:Set the subbase system switch in the OFF
position before mounting.
Thesubbasedoesnotrequirelevelingforoperation, but
— draftsordeadspotsbehinddoors, incornersorunder
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.
for appearance only.
Remove thermostat from subbase (Fig. 4).
Thermostat with Remote-Mounted Sensor
Installthermostatinanareathatisaccessibleforsetting
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.
12
T8611M
INSTALLATION
Fig. 4—Removing thermostat from subbase.
Use a 3/16 in. bit to drill the required holes. Gently tap
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.
anchors into holes until they are flush with the wall
WALL
REMOTE SENSOR
COVER
WIRES
THROUGH
WALL
OPENING
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
ANCHORS (2)
MOUNTING HOLES
WIRING
HOLE
REMOTE
SENSOR BASE
MOUNTING
SCREWS (2)
M1549B
Thread wires through the center opening of the sub-
base.
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.
13
68-0076—1
T8611M
INSTALLATION
terminals (Fig. 7) to assure thermostat/subbase contact.
1
7
L1
R
C
(HOT)
4
POWER
SUPPLY
HIGH
LIMIT
L2
3
FAN
SWITCH
AUX. HEAT
LED (GRN)
MONITOR
EM. HEAT
LED (RED)
ON
L
AUTO
AUXILIARY
HEAT RELAY
W3
HEAT 3
STAGE 2
HEAT RELAY
W2
HEAT 2
EMERGENCY
HEAT RELAY
SUBBASE
LOGIC/
CONTROL
CIRCUIT
THERMOSTAT
LOGIC
CIRCUIT
E
FAN RELAY
SYSTEM
SWITCH
G
CHANGEOVER
RELAY (COOL)
EM. HT.
HEAT
O
C.O.
CHANGEOVER
RELAY (HEAT)
OFF
AUTO
COOL
B
COOL 1
C.O.
STAGE 1 COMPRESSOR
CONTACTOR
Y
HEAT 1
STAGE 2 COMPRESSOR
CONTACTOR
HIGH
LIMIT
Y2
COOL 2
6
S1
S2
S1
S2
X2
2
CHECK LED
(YELLOW)
S3
S3
X1
5
202905 REMOTE
SENSOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
POSSIBLE CHECK LED CIRCUITS:
1
2
TO R
TO R
L1
(HOT)
X2
CHECK
LED
X2
CHECK
LED
X2
CHECK
LED
FAULT DETECTION
SWITCH
FAULT DETECTION
SWITCH
SWITCHING
DEVICE
1
(YELLOW)
(YELLOW)
(YELLOW)
24 Vac
TO C
TO C
L2
X1
X1
X1
SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER
SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER
3
4
5
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.
6
7
M1017D
14
T8611M
INSTALLATION
Fig. 7—Restrict wiring to recessed area surrounding terminals.
1
6
L1
R
C
(HOT)
4
POWER
SUPPLY
HIGH
LIMIT
L2
3
FAN
SWITCH
EM. HEAT
LED (RED)
AUX. HEAT
LED (GRN)
MONITOR
L
ON
AUTO
W3
STAGE 2
HEAT 3
HEAT RELAY
W2
HEAT 2
EMERGENCY
HEAT RELAY
SUBBASE
LOGIC/
CONTROL
CIRCUIT
THERMOSTAT
LOGIC
CIRCUIT
E
FAN RELAY
SYSTEM
SWITCH
G
CHANGEOVER
RELAY (COOL)
EM. HT.
O
B
HEAT
OFF
C.O.
C.O.
CHANGEOVER
RELAY (HEAT)
AUTO
COOL
COOL 1
STAGE 1 COMPRESSOR
CONTACTOR
Y
HEAT 1
STAGE 2 COMPRESSOR
CONTACTOR
HIGH
LIMIT
Y2
COOL 2
7
X2
2
S1
S1
CHECK LED
(YELLOW)
S2
S3
S2
S3
X1
5
202905 REMOTE
SENSOR
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
POSSIBLE CHECK LED CIRCUITS:
TO R
TO R
L1
(HOT)
X2
CHECK
LED
X2
CHECK
LED
X2
CHECK
LED
FAULT DETECTION
SWITCH
SWITCHING
DEVICE
FAULT DETECTION
SWITCH
1
(YELLOW)
(YELLOW)
(YELLOW)
24 Vac
TO C
TO C
X1
L2
X1
X1
SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER
SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER
3
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.
4
5
RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 ft. [61 m] MAXIMUM LENGTH. ROUTE
INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.
6
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR.
7
M1018D
15
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
7
L1
(HOT)
R
4
HIGH
LIMIT
POWER
SUPPLY
L2
3
C
FAN
SWITCH
AUX. HEAT
LED (GRN)
MONITOR
EM. HEAT
LED (RED)
ON
L
AUXILIARY
HEAT RELAY
AUTO
W3
W2
HEAT 3
HEAT 2
EMERGENCY
HEAT RELAY
SUBBASE
LOGIC/
CONTROL
CIRCUIT
E
THERMOSTAT
LOGIC
CIRCUIT
FAN RELAY
SYSTEM
SWITCH
G
CHANGEOVER
RELAY (COOL)
EM. HT.
HEAT
OFF
O
C.O.
CHANGEOVER
RELAY (HEAT)
AUTO
COOL
B
COOL 1
C.O.
STAGE 1 COMPRESSOR
CONTACTOR
Y
HEAT 1
COOL 2
HIGH
LIMIT
Y2
X2
2
6
S1
S1
S2
S3
CHECK LED
(YELLOW)
S2
S3
X1
5
202905 REMOTE
SENSOR
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
POSSIBLE CHECK LED CIRCUITS:
TO R
TO R
X2
CHECK
LED
X2
CHECK
LED
X2
CHECK
LED
(YELLOW)
X1
L1
(HOT)
FAULT DETECTION
SWITCH
SWITCHING
DEVICE
24 Vac
FAULT DETECTION
SWITCH
1
(YELLOW)
(YELLOW)
X1
TO C
TO C
X1
L2
SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER
SWITCH TO C (COMMON) SIDE
OF SYSTEM 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.
3
4
5
RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 ft. [61 m] MAXIMUM LENGTH. ROUTE
INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.
6
7
APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR.
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
M1019D
16
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.-HEAT-
OFF-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 adjust-
ment 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.
INSTALLING BATTERIES
ADJUSTING CYCLE RATE
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.
To customize the thermostat last heating stage cycling
performance to various types of auxiliary heating equip-
ment, a cycle rate adjustment screw is provided on the back
ofthethermostattoprovideoptimumsavingsandoccupant
comfort.
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.
NOTE: MOST APPLICATIONS WILL NOT REQUIRE
A CHANGE IN CYCLE RATE.
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
batteriesafterremovingoldbatteriesfrombackofthermo-
stat. After 20-30 seconds, it will be necessary to repro-
gram. REPL BAT indication will disappear within 5-10
minutes when thermostat is remounted on the powered
subbase.
Fig. 11—Cycle rate adjustment.
IMPORTANT:Forproperthermostatoperation, 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
With sys Tm switch set to OFF, hang the thermostat on
S
t
E
e
PRESENT
DAY/TIME
the tabs at the top of the subbase (Fig. 13A). Swing down
and press on lower edge until thermostat snaps in place
DAY
(Fig. 13B). pen cover and tighten the captive mounting
screws (Fig. 13C).
BACK
AHEAD
SETTING DAY D 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 tosetthecurrenttime.
If the display will not come on—
— check mounting of thermostat to subbase. If loose or
misaligned, remove thermostat and reinstall on the
17
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
!
CAUTION
!
During cold weather, some heat pumps will re-
quire that crankcase heater be energized several
hours before operating heat pump. Refer to
manufacturer’s recommendations.
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.
18
T8611M
CHECKOUT
FAN
Move the system switch to OFF, and the fan switch to
ON. Thefanshouldruncontinuously. Whenthefanswitch
is in the AUTO position, fan cycles with the heating or
cooling system.
System
Switch
Position
Press
This
Key
CHANGE
TO LAST
PERIOD
Look For This Response
Key
Down
03 Blank
Key Released
OFF
SKIP
NEXT
PERIOD
07 Blank
15 Blank
INSTALLER SELF-TEST (OPTIONAL)
PRESENT
SETTING
IMPORTANT:
• Thermostat must have ac power to perform self-test.
• Five-minute time delay on compressor does not
function during self-test.
PRESENT
SETTING
AUTO
COOL or
15 1st stage cooling, fan and
SYSTEM LED on.
15 2nd stage cooling also on.
(with fan
in AUTO)
PRESENT
SETTING
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
15 2nd stage cooling off.
15 1st stage cooling, fan and
SYSTEM LED on.
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
06 Blank
02 Blank
05 Blank
04 Blank
WARMER
COOLER
AHEAD
BACK
Fig. 14—All segments on display.
01 Control microprocessor
mask no. and revision no.
COPY
FROM
REPL
AM
SET
BAT
PT
PM
COPY
TO
00 Blank
ROOM
OUTDOOR
SUN MON TUE WED THU FRI SAT TEMPORARY
(CHECK
EACH )
POSITION)
12 See note A .
MORNING MIDDAY EVENING NIGHT
COOL ON HEAT ON
M 525A
PERIOD
OFF
08 Blank
CANCEL
PERIOD
13 Interface microprocessor
mask no. and revision
2. SetsystemswitchtoOFF.PressandreleaseAHEAD,
BACK, and PRESENT SETTING keys at the same time to
enter self-test.
DAY
no.
SET
HEAT/COOL
09 Blank
14 Blank
SET
PRESENT
DAY/TIME
3. Press each key as listed below, and look for re-
sponses 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
PRESENT
DAY/TIME
HEAT or
AUTO
(with fan
in auto)
14 1st stage heating, fan
and SYSTEM LED on.
14 2nd stage heating also on.
SET
PRESENT
DAY/TIME
SET
PRESENT
DAY/TIME
14 3rd stage heating and AUX.
HT. LED also on.
SET
PRESENT
DAY/TIME
14 3rd stage heating and AUX.
HT. LED off.
SET
PRESENT
DAY/TIME
14 2nd stage heating also off.
SET
PRESENT
DAY/TIME
14 1st stage heating, fan and
SYSTEMLEDalsooff.
HOLD
TEMP
OFF
10 Blank
RUN
PROGRAM
11 Normal operating display
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. Expla-
nation for each digit is following.
19
68-0076—1
T8611M
CHECKOUT • PROGRAMMING THE THERMOSTAT
First Digit
Degrees
Clock (Hrs.)
Third
Digit
System Switch
Position
Sensor
Location
0
1
2
3
F
F
12
24
12
24
0
1
4
5
COOL, AUTO or OFF
HEAT or EM.HT.
Local
Local
C
C
COOL, AUTO or COOL
HEAT or EM. HT.
Remote
Remote
M5346
Second Digit
System Switch Position
EM. HT., HEAT or OFF
AUTO
Nominal Cycle Rate
(cph at 50% load
for 3rd stage heat)
Fourth
Digit
0
1
2
4
5
6
3
COOL
Programming The Thermostat
STEP 1
SET
PRESENT
DAY/TIME
Press and release. The display shows
1:00 PM Mon.
PM
SETTING THE CURRENT DAY
AND TIME
MON
M2701
This thermostat can be programmed
either on the wall or in the hand. See
page 12 to remove the thermostat from
the subbase.
Press and hold until the current day ap-
pears in the display.
PM
DAY
TUE
M2702
TIME
Alwayspressthekeyswithfingertipor
similar blunt tool. Sharp instruments
like a pen or pencil point can damage
the keyboard.
Press and hold until the current time ap-
pears in the display. Be sure AM or PM
appears as desired.
PM
AHEAD
TUE
M2703
BACK
NOTE: Check the glossary, page 30,
for definitions of unfamiliar words.
This completes setting the current day and
time. Go on to Step 2.
STEP 2
Press and release. Note that the display
showsMORNINGandthepreprogrammed
time and temperature.
AM
SET
PT
SETTING THE PROGRAM
TIMES AND TEMPERATURES
FOR ONE DAY
PERIOD
MON
MORNING
HEAT
M2704
AM
AM
Chooseadaytoprogramfirst. Monday
is used in the examples. Start by pro-
gramming the MORNING time and
temperatures. The thermostat requires
a MORNING program every day. Set
additional programs as desired.
If the display reads COOL, press and re-
lease to switch to HEAT.
SET
PT
SET
HEAT/COOL
MON
MORNING
HEAT
M2704
Press and hold until MONDAY (or the
desired day) appears in the display.
SET
PT
DAY
MON
MORNING
HEAT
M2704
20
T8611M
PROGRAMMING THE THERMOSTAT
Press and hold until the display shows the
time that the temperature should be at the
comfort setting.
AM
SET
PT
AHEAD
BACK
MON
MORNING
HEAT
M2705
Press and hold until the display shows the
desired heating temperature.
AM
SET
PT
WARMER
COOLER
MON
MORNING
HEAT
M2706
If the display flashes while holding down
TEMPERATURE
WARMER
or
COOLER, the setting limit has been
reached.Ifthermostatisanautochangeover
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 set-
ting is 72° F. To set a higher heating tem-
perature, first raise the cooling setting.
Program the MIDDAY time and heat-
ing temperature if desired.
Press and release. The display shows MID-
DAY, but no time or temperature.
SET
PT
MON
MON
PERIOD
MIDDAY
MIDDAY
HEAT
HEAT
Press and hold until the display shows the
time to start the energy saving period.
AM
SET
PT
AHEAD
BACK
M2708
Press and hold until the display shows the
desired temperature.
AM
SET
PT
WARMER
COOLER
MON
MIDDAY
HEAT
M2709
NOTE: It is possible to cancel any
period showing on the display ex-
cept MORNING by pushing the
CANCEL PERIOD key. To move
to the next period while program-
ming, simply press the PERIOD
key again.
SET
PT
Program the EVENING time and tem-
perature, if desired.
Press and release. The display shows
EVENING, but no time or temperature.
MON
MON
PERIOD
EVENING
HEAT
SET
PT
PM
AHEAD
BACK
Press and hold until the display shows the
time the temperature should be at the com-
fort setting.
EVENING
HEAT
M2711
SET
PT
PM
WARMER
COOLER
Press and hold until the display shows the
desired heating temperature.
MON
EVENING
HEAT
M2712
21
68-0076—1
T8611M
PROGRAMMING THE THERMOSTAT
SET
PT
PM
PERIOD
Program the NIGHT time and tem-
perature, if desired.
Press and release. The display shows
NIGHT and the preprogrammed time and
temp-erature.
MON
NIGHT
HEAT
M2713
SET
PT
PM
AHEAD
BACK
Press and hold until the display shows the
time to start the energy saving period.
MON
NIGHT
HEAT
M2714
SET
PT
PM
WARMER
COOLER
Press and hold until the display shows the
desired heating temperature.
MON
NIGHT
HEAT
M2715
heating.
SET
HEAT/COOL
SET
PT
PM
Set the cooling temperatures for all the
periods programmed. The program
times are the same for both heating and
cooling.Onlythecoolingtemperatures
need to be programmed if program-
ming has been completed for heating.
If you change program times for cool-
ing, youarealsochangingthetimesfor
MON
NIGHT COOL
Press and release. The display shows
COOL, the preprogrammed cooling tem-
perature and the programmed start time for
NIGHT.
M2716
SET
PT
PM
WARMER
COOLER
MON
NIGHT COOL
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 auto-
matically between heating and cooling, the
heating temperature must be at least 3 de-
grees F below the air conditioning tem-
perature. For example, if the heating set-
ting is 72° F, the minimum cooling setting
is 75° F. To set the cooling temperature
lower, first lower the heating setting.
AM
AM
SET
PT
PERIOD
MON
MORNING
COOL
M2718
Press and release. The display shows the
preprogrammed cooling temperature and
theprogrammedstarttimeforMORNING.
SET
PT
WARMER
COOLER
MON
MORNING
COOL
M2719
Press and hold until the display shows the
desired cooling temperature for MORN-
ING.
AM
AM
SET
PT
PERIOD
MON
MIDDAY
COOL
M2720
SET
PT
WARMER
COOLER
Press and release. The display shows the
preprogrammed cooling temperature and
the programmed start time for MIDDAY.
MON
MIDDAY
COOL
M2721
Press and hold until the display shows the
desiredcoolingtemperatureforMIDDAY.
SET
PT
PM
ROOM
PERIOD
MON
EVENING
COOL
M2722
SET
PT
PM
WARMER
COOLER
ROOM
Press and release. The display shows the
preprogrammed cooling temperature and
the programmed start time for EVENING.
MON
EVENING
COOL
M2723
Press and hold until the display shows the
desiredcoolingtemperatureforEVENING.
22
This completes the program schedule for
Download from Www.Somanuoalns.ecodmay. A. lGl MoatnouaSltseSpe3artcoh cAonpdyDothwinslopardo.gram
T8611M
PROGRAMMING THE THERMOSTAT
If necessary, press and release to enter the
programming mode.
STEP 3
SET
PT
PM
COPYING THE PROGRAM TO
THE DESIRED DAYS
PERIOD
DAY
MON
NIGHT
HEAT
M2724
Press and hold until the day containing the
program to be copied shows in the display.
It is possible to copy the program for
one day to any other day or combina-
tion of days. The new program will
replace any program already set in the
day selected.
SET
PT
PM
MON
NIGHT
HEAT
M2724
Press and release. The day to be copied will
show, and the next day will flash, in the
display.
COPY
FROM
MON TUE
M2725
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.
COPY
TO
MON TUE WED
M2726
M2727
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.
DAY
MON
WED
Press and release the COPY TO key again
to select the day that is flashing, or the
DAY key to bypass it.
COPY
TO
MON
WED THU
M2728
M2729
Continue until all desired days are showing
in the display and are not flashing.
PM
TUE
MIDDAY
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.
Press and release to copy the program into
all the days selected.
RUN
PROGRAM
Press and release to enter the programming
mode.
STEP 4
AM
SET
PT
PERIOD
SETTING THE SCHEDULES
AND TEMPERATURES FOR
THE REMAINING DAYS
TUE
MIDDAY
HEAT
M2730
Press and hold until the day desired to
program shows on the display.
Use the procedures described in Steps
2 and 3 and summarized in this step to
program the remaining days.
SET
PT
DAY
FRI
FRI
MIDDAY
MIDDAY
HEAT
M2731
If COOL shows on the display, press and
release to switch to HEAT.
SET
HEAT/COOL
SET
PT
HEAT
M2731
Use the AHEAD/BACK keys to set the
time and the WARMER/COOLER keys to
set the heating temperature.
AHEAD
BACK
WARMER
COOLER
Press and release the PERIOD key to step
throughtheremainingtimeperiods.Usethe
AHEAD/BACKkeystosetthetimeandthe
WARMER/COOLER keys to set the heat-
ing temperature for each time period.
PERIOD
AHEAD
BACK
WARMER
COOLER
23
68-0076—1
T8611M
PROGRAMMING THE THERMOSTAT
Press and release so COOL shows on the
display.
AM
SET
HEAT/COOL
SET
PT
FRI
MORNING
COOL
M2732
PressandreleasethePERIODkeytostep
through the time periods, and use the
WARMER/COOLER keys to set the
cooling temperature for each period.
WARMER
COOLER
PERIOD
This completes the time and temperature
program for another day. Copy it into
additional days if desired.
Press and release COPY FROM to enter
the copy mode. The next day flashes on
the display.
COPY
FROM
FRI SAT
M2733
M2734
Press and release the COPY TO key to
selectthedaythatisflashing, ortheDAY
key to bypass it.
COPY
TO
SUN
FRI
DAY
Continue, using the COPY TO key to
bringupthenextday, followedbyCOPY
TO to select, orDAY to bypasstheDAY,
until all desired days are selected.
COPY
TO
COPY
TO
DAY
Press and release RUN PROGRAM to
complete the copy.
RUN
PROGRAM
PM
TUE
MIDDAY
M2735
Repeat Step 4 as needed until all days are
programmed.
STEP 5
FAN ON: The fan runs continuously.
Use for improved air circulation during
special occasions or for more efficient
electronic air cleaning.
FAN
SETTING THE SYSTEM AND
FAN SWITCHES ON THE
SUBBASE.
ON AUTO
M2757
Depending on thermostat model, some
of the switch positions shown may not
be available. Note the positions pro-
videdonsubbase,thensettheswitch(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
withtheauxiliaryheat(onsomemodels).
FAN
ON AUTO
M2758
First set the fan switch.
Then set the system switch.
EM. HT: The thermostat controls only
the backup heat. The heat pump is off.
EM. HT. HEAT OFF
EM. HT. HEAT OFF
AUTO COOL
M2752
HEAT:Thethermostatcontrolstheheat-
ing system.
AUTO COOL
M2753
OFF: Both the heating and cooling sys-
tems are off.
EM. HT. HEAT OFF
AUTO COOL
M2754
24
T8611M
PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT
Then set the system switch. (contin-
ued)
AUTO (select models only): The ther-
mostatcontrolseithertheheatingorcool-
EM. HT. HEAT OFF
AUTO COOL
M2755
ing system, depending on room tempera-
ture.
COOL:Thethermostatcontrolsthecool-
ing system.
EM. HT. HEAT OFF
AUTO COOL
M2756
Now, read on to learn about the oper-
ating flexibility that makes this ther-
mostat THE SMART CHOICE.
This completes the programming of the
thermostat.
If thermostat was removed from the wall
to program, replace it following the pro-
cedure on page 20.
Operating The Thermostat
TEMPORARILY CHANGING
THE PROGRAM
These features allow customizing the
program for those times when some-
one comes home early, is working late
or planning to be out for the evening.
Changes made with these keys are ac-
tive for one program period and then
are canceled.
To keep the current temperature
through the next program period:
Press and release. The name of the period
SKIP
NEXT
PERIOD
SET
PT
PM
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.
TUE
MIDDAY EVENING
M2736
To go back to the temperature of the
previous program period:
Press and release. The display will show
the name of the previous period and flash
“temporary” until the next regularly
scheduled period starts.
CHANGE
TO LAST
PERIOD
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 tem-
perature for the current period only:
Press and hold until the desired tempera-
ture is reached. The display will flash
“tem-porary” until the next programmed
time period starts.
SET
PT
WARMER
COOLER
TEMPORARY
HEAT
M2738
To change back:
Press and release to cancel any of the
temporary settings.
RUN
PROGRAM
PM
TUE
MIDDAY
M2739
25
68-0076—1
T8611M
OPERATING THE THERMOSTAT
REPROGRAMMING THE
THERMOSTAT
PERIOD
DAY
Press and hold until the desired time period
shows on the display.
If schedule changes or a different tem-
perature is desired, update any setting
without affecting the rest of the pro-
gram.
Press and hold until the desired schedule
day shows on the display.
Press and hold the Time or Temperature
keys until the display shows the desired
new program.
WARMER
COOLER
AHEAD
BACK
are copied.
COPY
FROM
COPY
TO
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 the new program into other days,
if desired. When copying a program, all
the times and temperatures for that day
DAY
RUN
PROGRAM
Press and release to return to normal opera-
tion.
gram.
SET
PT
HOLD
TEMP
HOLDING A TEMPERATURE
FOR EXTENDED ABSENCE
HEAT
Press and release.
M2740
SET
PT
WARMER
COOLER
This feature is particularly useful when
going on vacation or other extended
absence. It does not cancel the pro-
HEAT
Press and hold to change the temperature
setting. After a few seconds, the display
will show the current temperature.
M2741
PRESENT
SETTING
SET
PT
HEAT
Press and release to check the temperature
setting.
M2742
RUN
PROGRAM
PM
TUE
MIDDAY
M2743
Pressandreleasetocancelmanualcon-
trol.
others can be canceled. Each time period
for each day must be canceled separately.
SET
PT
PM
PERIOD
MON
NIGHT
HEAT
M2744
CANCELING PROGRAM
SETTINGS
Press and hold until the desired time period
shows on the display.
The thermostat requires time and tem-
peraturesettingsintheMORNINGtime
period for each day, but any of the
SET
PT
PM
WED
DAY
NIGHT
HEAT
M2745
Press and hold until the desired day shows
on the display.
SET
PT
CANCEL
PERIOD
WED
NIGHT
HEAT
M2746
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.
Both the heating and cooling tempera-
tures will be canceled.
RUN
PROGRAM
PM
WED
EVENING
HEAT
M2747
Use the copy function to cancel the
program from other days, but remem-
26
T8611M
OPERATING THE THERMOSTAT • OPERATION
Press and release to return to normal
operation.
without affecting the permanent program.
SET
PT
PM
PERIOD
FRI
NIGHT
HEAT
Pressandholduntilthedesiredperiodshows
on the display. The start time and tempera-
ture setting will appear on the display.
M2748
CHECKING THE PROGRAM
TIMES AND TEMPERATURES
If desired, check all the stored settings
SET
PT
PM
SAT
NIGHT
DAY
HEAT
Press and release to display the next day
time and temperature for that period.
M2749
SET
PT
RUN
PROGRAM
PM
FRI
EVENING
Press and release to return to normal opera-
time.
M2750
tion.
PRESENT
SETTING
SET
PT
HEAT
CHECKING THE CURRENT
TEMPERATURE SETTING
Press and release. The display will show
the current temperature setting for several
seconds, then revert to the room tempera-
ture.
M2751
Press a single key to compare actual
room temperature to the setting at any
During recovery from energy savings, the
setting displayed will not match the pro-
grammed setting. This is because the ther-
mostat gradually changes the temperature
setting during recovery to provide maxi-
mum comfort combined with most effi-
cient use of the heating or cooling equip-
Operation
ment.
TheT8611MThermostatprovidesautomaticcontrolof
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:
• The comfort setting is achieved at the programmed
time and maintained regardless of weather condi-
tions; occupants come home and wake up to com-
fort.
ADAPTIVE INTELLIGENT RECOVERY™
OPERATION
• Drafts from low temperature discharge air are mini-
mized during occupied periods.
AdaptiveIntelligentRecovery™istheHoneywelltrade-
mark for the way the T8611 controls the heating and
cooling equipment during recovery from an energy sav-
ings setting to a comfort setting. During recovery, the
control point changes gradually rather than jumping from
theenergysavingssettingtothecomfortsettingallatonce.
This provides additional energy savings.
• The thermostat automatically uses the more eco-
nomical heat pump as the primary heat source dur-
ing heat mode recovery, avoiding the use of the
expensive auxiliary heat.
• Comfort and energy savings can be achieved in both
heating and cooling.
When Adaptive Intelligent Recovery™ is used in the
heatingmode, thecontrolpointraisesgradually, maximiz-
ing 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 auxil-
iary 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
• Reduces heat pump compressor cycling, extending
equipment life.
Use of Outdoor Thermostats
BecauseAdaptiveIntelligentRecovery™callsforaux-
iliary 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
27
68-0076—1
T8611M
OPERATION
the auxiliary heat even when the T8611 is calling for it.
cycles even during the energy savings period. When re-
covery 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,theheatpumpisoncontinuouslyandauxiliaryheat
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°
or3° Fbelowthecontrolpointbecauseofthetimerequired
to warm up the walls and furniture. Auxiliary heat will
cycle as necessary during the energy savings period.
(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.
When Adaptive Intelligent Recovery™ Is Used
Adaptive Intelligent Recovery™ is used during recov-
ery 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 ther-
mostat.
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 elec-
tronic control strategies—cycling by heat anticipation and
proportional plus integral control.
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.
Electronic cycling by heat anticipation acts like a tradi-
tional 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°
or3° C]withaconventionalthermostat. Thisphenomenon
is called droop.
In Moderate Weather
When outdoor temperature is below the balance point
of the heat pump, the heat pump will run continuously
duringtherecoveryperiodandtheauxiliaryheatwillcycle
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.
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. Occu-
pants do not need to continually adjust thermostat setting
to maintain desired temperature, even during severe
weather.
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
compressorwill not come on again forat 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.
28
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.
SYMPTOM
POSSIBLE CAUSE
ACTION
HEAT PUMP OR AUXILIARY HEAT
WON'T OPERATE
CHECK POWER TO HEAT PUMP OR
AUXILIARY HEATING SYSTEM
–ON-OFF SWITCH
NO ac POWER TO THERMOSTAT
–FUSE OR CIRCUIT BREAKER
–LOOSE 24 V CONNECTION
-AT THERMOSTAT
-AT HEAT PUMP OR AUXILIARY HEATING SYSTEM
–INCORRECT WIRING
-CHECK WIRING DIAGRAM
THERMOSTAT INOPERATIVE
CONDUCT SELF-TEST; SEE CHECKOUT.
ADJUST TEMPERATURE BY PUSHING WARMER/COOLER
KEYS.
PRESENT SETTING TOO LOW/HIGH
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
NO DISPLAY
REPLACE THERMOSTAT.
INOPERATIVE THERMOSTAT
CHECK THAT HEAT OR COOL SYSTEM POWER IS ON.
PRESS RUN PROGRAM KEY TWICE.
NO POWER TO THERMOSTAT
THERMOSTAT IN SELF-TEST MODE
THERMOSTAT MOUNTED INCORRECTLY
ON BASE
SEE INSTALLATION INSTRUCTIONS FOR CORRECT
MOUNTING.
PRESENT SETTING APPEARS
INACCURATE
•
•
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 IN RECOVERY MODE
•
ROOM TEMPERATURE DISPLAY
APPEARS INACCURATE
THERMOSTAT HAS SEPARATE REMOTE-
MOUNTED SENSOR
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.
•
•
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
REPROGRAM THERMOSTAT TO MAKE PERMANENT
CHANGE IN PROGRAM. WARMER/ COOLER KEYS ARE
TEMPORARY UNLESS PERIOD KEY IS PRESSED FIRST.
WARMER/COOLER KEYS BEING USED
TO ADJUST TEMPERATURE
PROGRAM IS LOST DUE TO POWER
OUTAGE OR DISPLAY GOES BLANK
WHEN POWER IS TURNED OFF
BATTERIES ARE INCORRECTLY INSTALLED
BATTERIES ARE DEAD
REMOVE AND REPLACE PER MARKINGS ON THERMOSTAT.
REPLACE BATTERIES.
DISPLAY FLASHES WHILE
PROGRAMMING
CHECK HOMEOWNERS MANUAL FOR CORRECT PROGRAM
SEQUENCE.
IMPROPER 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.
DISPLAY FLASHES DURING
OPERATION
PROGRAMMING HAS BEEN LOST BECAUSE OF
A POWER OUTAGE
REPROGRAM ACCORDING TO PROGRAMMING
INSTRUCTIONS (MAKE SURE BATTERIES ARE INSTALLED).
M1020A
29
68-0076—1
T8611M
GLOSSARY
Glossary
AUX. HT. light (green)
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.
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 typi-
cally is used only when the heat pump is unable to handle
the load (located on subbase).
Setback
CHECK light (yellow)
Consult heat pump literature to determine its meaning
(located on subbase).
Reducing the temperature in the building for a set period
inheatingforenergysavings. Thelowertemperatureisthe
energy savings temperature.
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, itmayalsoindicatetheneedtoswitchtoEM. 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 ef-
fect.
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 (cool-
ing) temperature.
SYSTEM light (yellow)
This light glows whenever the thermostat is calling for
heating or cooling (located on thermostat).
Preprogrammed schedule
Time period
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:
One of four program periods: MORNING, MIDDAY,
EVENING, and NIGHT; available with the Chrono-
therm 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.
Start
Time
Temperature
Period
Heating
Cooling
MORNING 6:00 AM
70° 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.
MIDDAY
EVENING
NIGHT
- - - - - -No program - - - - - - - - - -
- - - - - -No program - - - - - - - - - -
10:00 PM 60° F
78° F
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 sched-
ule.
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
savingstemperatureissetonlyfortheheatingseasonso
family members can sleep cool in summer.
Recovery
The time when the thermostat operates the heating or air
30
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
31
68-0076—1
Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Home and Building Control
Honeywell Limited—Honeywell Limitée
740 Ellesmere Road
Helping You Control Your World
Scarborough, Ontario
M1P 2V9
QUALITY IS
KEY
Printed in U.S.A.
|