Honeywell T8611M User Manual

(7-Day Programming)

Chr onotherm 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.

T8611M

■ Full seven-day program capability; different sched-

ules may be selected for every day.

■ Can be programmed in hand (with batteries in-

stalled) or on the wall to provide up to four tem-

perature periods per day.

■ Large digital clock (liquid crystal display) indi-

cates continuous time-of-day, day-of-week, cur-

rent period and room temperature.

■ Adaptive Intelligent Recovery™ brings room tem-

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.

■ 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

TRADELINE MODELS

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

TABLE 1—TRADELINE MODELS AVAILABLE.

Stages Changeover Switching

Thermostat Heat Cool Type System Fan Application Program

T8611M* 3 2 Automatic EM. HT.-HEAT-OFF- ON-AUTO Heat Pump 7-Day

AUTO-COOL

*Model available with separate sensor for remote temperature sensing.

Specif ications

replacement value.

TRADELINE models available are listed in Table 1.

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 ther-

mostat 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 rela-

tive 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 thermo-

meter 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 face-

plate.

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 Inf ormation

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.

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

[46]

[135]

3 [83]

4 [121]

M5181A

7 [179]

[104]

T8611M

SPECIFICATIONS

[50]

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

FRONT

[104]

SIDE

[50]

31 32

BACK

[51]

[50]

[16]

[35]

[25]

[8]

[4]

DIA.

[13]

M5244

3 68-0076—1

T8611M SPECIFICATIONS

Fig. 3—Typical thermostat keypad.

SET PRESENT DAY/TIME

HOLD TEMP

PROGRAM

HEAT/COOL

HEAT OFF

RUN

DAY

SET

COOL

PERIOD

CANCEL

PERIOD

MIDDAY

COPY FROM

COPY

WED

TIME

AHEAD

BACK COOLER

ROOM

HEAT ON

TEMPERATURE

PRESENT

SETTING

WARMER

FAN

ON AUTO

SYSTEM

SKIP

PERIOD

CHANGE TO LAST

PERIOD

M5360

T8611M

SELECTION/APPLICATION

Selection/A pplication

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.

PROGRAMMING

Does the thermostat selected accommodate the customer’s daily schedule, lifestyle or work schedule? Refer to choices below.

TRADELINE Daily Temperature

Device Programming Selection

T8611G,R* Weekday, 4 heat and

Sat, Sun. 4 cool

T8611M 7-day 4 heat and

(each day 4 cool

different)

IF RETROFIT/REPLACEMENT APPLICATION, CONSIDER

• equipment requirements — system switching (manual: EM. HT.-HEAT-OFF-

COOL, 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 manufac-

turer.

• existing wiring — Are there enough conductors to operate the equip-

ment and the thermostat? Can a new cable be pulled?

• existing thermostat — Table 3 is a guide for replacing popular Honeywell

standard nonprogrammable thermostats with a T8611.

SECURITY

Does the thermostat selected provide access to programming and the override features that will best suit the application? Refer to choices below.

*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 trans-

former common to provide continuous 24V power for thermostat operation. This feature is commonly specified and provided by equipment manufacturer.

Typical

Access Application Device

Free access to Home or T8611 programming owner-occupied and adjustment/ commercial override. building.

Restricted Public building. T8611 with TG512 access to Locking Cover; device. T8611 with remote

temperature sensing.

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

Changeover Auto Programming 7-day SYSTEM LED Yes Lights on call for heat or cool. EM. HEAT LED (red) Yes Lights continuously in EM. HEAT mode. AUX. HEAT LED (green) Yes Lights during call for final auxiliary heat stage. CHECK LED (yellow) Yes Field wired option; indicates equipment malfunction. Remote Temperature Yes Available on T8611M7040 only. (202905A Remote Sensor

Sensing included). WIRING TERMINAL

FUNCTION 24 Vac Common C Must be connected to control transformer to operate

thermostat. 24 Vac Power R Compressor, Stage 1 Y

heat and cool. Compressor,

Stage 2 cool unconnected. Second Stage Heat

Auxiliary (Resistive) second stage is compressorized, connect stage 2 to W2; Third Stage Heat

Fan G Changeover Heat Mode B O/B changeover terminals are energized continuously

Changeover Cool Mode O System Monitor, L Energizes EM. HEAT LED when externally powered.

continuously energized in EM. HEAT mode.

Emergency Heat E energized on call for stage 1 heat in EM. HEAT mode

Check LED terminals to indicate equipment malfunction

Remote Temperature Sensing 202905A Remote Sensor for proper thermostat operation.

W2 W3

X1 X2

S1 S2 S3

If applying T8611M to 1-stage cooling system, leave Y2

If applying T8611M to 2-stage heat systems in which the

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.

following first call for cool or heat, respectively.

See wiring diagrams for hookup alternatives.

Available on T8611M7040 only. Must be connected to

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) T8611M7040cThermostat Subbase Thermostat Subbase

(also see form 68-0057, Specifications) T874 Q674 T872 Q672 Comments

Amana

• D1009 F1022 D1003 F1026 Separate first stage

• D1017 D1011 heat/cool terminals W1, Y1.

• D1165 D1300 Arco/Comfort Maker

••

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

Arco/Friedrich

••

• na na na na Changeover on heat, check LED optional.

Bard

••

• N1024 F1261 N1036 F1299 Changeover on heat (typical),

• • • R1129 L1181 R1146 L1185 check LED optional, equipment terminal W1 to thermostat B.

Bryant, Day-Night, Payne

•

••

changeover

••

a,b

•

a a

•

G1451 F1113bG1166 F1125 Check LED optional; F = X1,

• G1261 F1253 jump X2 to C. Note: P terminal

• J1010 L1371 G1174 available on manual

• R1335 L1405 (T8611R) models only. Carrier

••

• G1055 J1035 G1075 J1054 Check LED optional (typical)

• • • G1071 L1041 G1158 L1052

• • • G1121 L1397 G1182

• • • P1005 G1273

• • • G1307

• • • G1257 L1169

• • • J1002 L1371

• • • J1028 L1074

• D1074 F1059 Multistage heat pump

• F1030

• F1063

• E1114 No Supl. Ht. function

• E1042 No Supl. Ht. function

• D1264 L1116 Multistage heat pump Command Aire

• • • H1005 C1041 H1009 C1086 No AUX. HEAT or EM.

• • • G1352 C1066 HEAT required; Y1 = 0

No CHECK LED.

Dual transformer requires conversion to single transformer.

Model includes separate sensor for remote temperature sensing.

(continued)

T8611M

7 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.)

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) T8611M7040cThermostat Subbase Thermostat Subbase

(also see form 68-0057, Specifications) T874 Q674 T872 Q672 Comments

Coleman

••

• R1368 L1421 na na Late models optional check

LED. Z = X2, jump X1 and C, K = L.

• • • na na na na Earlier T.H.E. models with reverse-acting EM. HT. require relay isolation.

Crispaire/Marvair

• • • G1089 F1162 G1208 F1166

F1204 F1323

• • • R1111 L1215 R1156 L1094

Fedders/Airtemp/Climatrol

•

C1398 L1090 C1509 L1102 Separate first stage heat/cool C1406 C1517 terminals required; check LED C1414 C1541 optional; equipment terminal

K to thermostat E.

Florida Heat Pump

••

• na na na na Optional check LED; X = X1, jump X2 to C.

Heatwave/Southwest Mfg.

• • • G1105 F1170 G1232 F1224 Heil Quaker/Whirlpool/Tempstar

• • • R1137 L1132 R1172 L1193 Equipment terminal B

to thermostat C.

Honeywell

• A-D (typ.) F1006 A-D (typ.) F1000 Separate first stage

• F1022 F1026 heat/cool terminals.

• F1048 F1042

• C1000 F1089 C1004 F1075

• • C1018 C1038

• • C1117 C1350 °C

• • C1240 C1566 °C

• • • G1246 F1212 G1224 F1208 TRADELINE

• • • G1444 G1000 F1018

• • • G1018 °C

• • • G1212 F1238 G1083 F1158

• • • G1139

No CHECK LED.

Dual transformer requires conversion to single transformer.

Model includes separate sensor for remote temperature sensing.

(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) T8611M7040cThermostat Subbase Thermostat Subbase

(also see form 68-0057, Specifications) T874 Q674 T872 Q672 Comments

Honeywell (continued)

• • • N1016 F1220 N1002 F1133 Changeover on heat; equip-

• • • N1040 F1261 N1028 F1216 ment terminal C to thermostat

• • • R1004 B1042 R1008 B1046 Y, W1 to B, K to E.

• • • B1109 R1057 L1037

• • • R1152 L1207 R1198 L1227

• • • R1285 L1157

• • • R1350 L1181 Janitrol/Tappan

• • • G1147 F1139 G1109 F1117 Equipment terminal C to

thermostat C.

Lennox NOTE: Rewire for single 75

transformer if two-transformer system.

• • • G1014 F1113 G1026 F1067

• • • G1022 E1148 G1125 E1019 °C

• • • G1162 G1091 DoD specs—use guard.

• • • G1154 F1105 G1323 L1201

• • • R1024 B1160

• • • R1040 B1202

• • • R1178 L1355

• • • L1165

• • • C1148 L1165

• D1207 L1199 Two-speed unit; optional check

• L1389 LED; thermistor A not used. Ter- minal Conversion Guide:

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)

No CHECK LED.

Dual transformer requires conversion to single transformer.

Model includes separate sensor for remote temperature sensing.

9 68-0076—1

(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) T8611M7040cThermostat Subbase Thermostat Subbase

(also see form 68-0057, Specifications) T874 Q674 T872 Q672 Comments

Luxaire

• • • G (Borg F1188 G1315 F1281 Warner)

Magic Chef

• na na na na Earlier PB series, separate first

••

• na na na na Late PE series, optional check

stage heat/cool. LED; X1 = X1, jump X2 to R.

Rheem/Ruud

• • • G1097 F1238 G1133 F1158

• • • G1238 G1141 L1157

• • • R1081 L1045

• • • G1220 R1107 L1136

• • • R1079

• • • R1095

Square D/Sun Dial

•

C1224 F1071 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 G1265 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.

No CHECK LED.

Dual transformer requires conversion to single transformer.

Model includes separate sensor for remote temperature sensing.

(continued)

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) T8611M7040cThermostat Subbase Thermostat Subbase

(also see form 68-0057, Specifications) T874 Q674 T872 Q672 Comments

Wesco/Addison

• • • G1287 F1253 Equipment terminal C1 to thermostat C, W1 to Y (W1 + Y1),

• • • R1012 B1109 R1016 B1103 Y1 to 0. Common to thermostat

• • • G1265 F1265 direct from control transformer.

• • • G1281

Westinghouse

• • • G1048 F1121 G1034 F1141

• • • F1246 F1091

• • • F1279 F1257

• • • J1019 J1013

• • • J1050 J1062

• • • R1103 L1108 R1149 L1110

• • • L1173 L1128

• • • L1151

• na na na na Separate first stage heat/cool

ter- minals required.

• 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 L1348 na na

• • • N1008 F1196 na na Changeover on heat; W1 = B. York/Borg Warner

••

• G1170 J1027 G1042 J1021 Optional check LED; X = X1,

• • • G1295 F1311 G1299 L1177 jump X2 to C; equipment ter-

• • • G1345 L1363 G1331 D1077 minal B to thermostat C,

• • • G1402 D1032 G1364 W to W2, H to B, T not re-

quired.

• • • G1410 G1398

• • • G1428

• • • G1436

• • • R1046 L1017 R1032 L1011

• • • R1169 L1330

• • • R1251 L1272 Zone Aire

• • • N1040 F1261 Changeover on heat;

• • • R1350 L1181 W1 = B.

No CHECK LED.

Dual transformer requires conversion to single transformer.

Model includes separate sensor for remote temperature sensing.

11 68-0076—1

T8611M

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.

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.

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.

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.

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.

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.

Fig. 4—Removing thermostat from subbase.

REMOTE SENSOR COVER

REMOTE SENSOR BASE

WALL

MOUNTING HOLES

WIRING HOLE

M1549B

WALL ANCHORS (2)

MOUNTING SCREWS (2)

WIRES THROUGH WALL OPENING

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.

Thread wires through the center opening of the sub-

base.

T8611M

INSTALLATION

Use a 3/16 in. bit to drill the required holes. Gently tap

anchors into holes until they are flush with the wall

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.

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.

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

13 68-0076—1

T8611M INSTALLATION

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

POWER SUPPLY

FAN SWITCH

ON AUTO

THERMOSTAT LOGIC CIRCUIT

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

POSSIBLE CHECK LED CIRCUITS:

CHECK LED (YELLOW)

SWITCH TO R (POWER) 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.

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.

FAULT DETECTION SWITCH

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

SUBBASE LOGIC/ CONTROL CIRCUIT

EM. HT. HEAT

OFF

AUTO

COOL

TO R

TO C

SYSTEM SWITCH

HEAT 1

HIGH LIMIT

S1 S2

CHECK LED (YELLOW)

SWITCH TO C (COMMON) SIDE OF SYSTEM TRANSFORMER

S1 S2

202905 REMOTE SENSOR

FAULT DETECTION SWITCH

HIGH LIMIT

EM. HEAT LED (RED)

COOL 1

TO R

CHECK

LED

TO C

(YELLOW)

SWITCH IN SECONDARY OF SEPARATE TRANSFORMER

HEAT 3

SWITCHING DEVICE

AUX. HEAT LED (GRN)

HEAT 2

C.O.

COOL 2

CHECK LED (YELLOW)

24 Vac

MONITOR

AUXILIARY HEAT RELAY

STAGE 2 HEAT RELAY

EMERGENCY HEAT RELAY

FAN RELAY

CHANGEOVER RELAY (COOL)

CHANGEOVER RELAY (HEAT)

STAGE 1 COMPRESSOR CONTACTOR

STAGE 2 COMPRESSOR CONTACTOR

L1 (HOT)

M1017D

L1 (HOT)

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

T8611M

INSTALLATION

THERMOSTAT LOGIC CIRCUIT

POWER SUPPLY

SUBBASE LOGIC/ CONTROL CIRCUIT

EM. HT. HEAT

OFF AUTO

COOL

HEAT 1

HIGH LIMIT

FAN SWITCH

SYSTEM SWITCH

ON AUTO

HIGH LIMIT

COOL 1

EM. HEAT LED (RED)

HEAT 3

HEAT 2

C.O.

COOL 2

AUX. HEAT LED (GRN)

STAGE 2 COMPRESSOR CONTACTOR

MONITOR

EMERGENCY HEAT RELAY

CHANGEOVER RELAY (COOL)

CHANGEOVER RELAY (HEAT)

STAGE 1 COMPRESSOR CONTACTOR

STAGE 2 HEAT RELAY

FAN RELAY

L1 (HOT)

S2 S3

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

POSSIBLE CHECK LED CIRCUITS:

CHECK LED (YELLOW)

SWITCH TO R (POWER) 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.

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.

FAULT DETECTION SWITCH

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

TO R

TO C

SWITCH TO C (COMMON) SIDE OF SYSTEM TRANSFORMER

S1 S2 S3

202905 REMOTE SENSOR

CHECK LED (YELLOW)

FAULT DETECTION SWITCH

TO R

TO C

CHECK LED (YELLOW)

SWITCH IN SECONDARY OF SEPARATE TRANSFORMER

CHECK LED (YELLOW)

SWITCHING DEVICE

24 Vac

L1 (HOT)

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,

THERMOSTAT LOGIC CIRCUIT

POWER SUPPLY

SUBBASE LOGIC/ CONTROL CIRCUIT

EM. HT. HEAT

OFF

AUTO COOL

HEAT 1

HIGH LIMIT

FAN SWITCH

ON AUTO

SYSTEM SWITCH

HIGH LIMIT

EM. HEAT LED (RED)

COOL 1

HEAT 3

HEAT 2

AUX. HEAT LED (GRN)

C.O.

COOL 2

MONITOR

AUXILIARY HEAT RELAY

STAGE 1 COMPRESSOR CONTACTOR

EMERGENCY HEAT RELAY

FAN RELAY

CHANGEOVER RELAY (COOL)

CHANGEOVER RELAY (HEAT)

L1 (HOT)

S1 S2 S3

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

POSSIBLE CHECK LED CIRCUITS:

CHECK LED (YELLOW)

SWITCH TO R (POWER) 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.

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.

FAULT DETECTION SWITCH

DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.

TO R

TO C

S1 S2 S3

202905 REMOTE SENSOR

CHECK LED (YELLOW)

SWITCH TO C (COMMON) SIDE OF SYSTEM TRANSFORMER

FAULT DETECTION SWITCH

TO R

TO C

CHECK LED (YELLOW)

SWITCH IN SECONDARY OF SEPARATE TRANSFORMER

CHECK LED (YELLOW)

SWITCHING DEVICE

24 Vac

L1 (HOT)

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.

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.

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.

Fig. 11—Cycle rate adjustment.

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.

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.

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.

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. 12—Battery placement.

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.

MOUNTING THE THERMOSTAT

With system switch set to OFF, hang the thermostat on the tabs at the top of the subbase (Fig. 13A). Swing down

SET

PRESENT

DAY/TIME

and press on lower edge until thermostat snaps in place (Fig. 13B). Open cover and tighten the captive mounting

DAY

screws (Fig. 13C).

BACK

SETTING DAY AND TIME

AHEAD

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

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.

CAUTION

During cold weather, some heat pumps will require that crankcase heater be energized several hours before operating heat pump. Refer to manufacturer’s recommendations.

HEATING

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 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 cooling

temperature must be set at least 3° F [2° C] above the heating temperature, or display will flash.

Checkout

COOLING

CAUTION

Do not operate cooling if outdoor temperature is below 50° F [10° C]. Refer to manufacturer’s recommendations.

NOTE: When cooling setting is changed, thermostat will

wait up to five minutes before turning on the cooling

equipment. This delay protects the compressor.

Move the system switch to COOL and the fan switch to AUTO. Press COOLER key until the setting is about 10° F [6° C] below room temperature. The cooling equipment and fan should start. Press WARMER key until the setting is about 10° F [6° C] above room temperature. The cooling equipment and fan should stop.

NOTE: On an AUTO changeover thermostat, the heating

temperature must be set at least 3° F [2° C] below the

cooling 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.

INSTALLER SELF-TEST (OPTIONAL) IMPORTANT:

• Thermostat must have ac power to perform self-test.

• Five-minute time delay on compressor does not function during self-test.

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

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

Fig. 14—All segments on display.

REPL

MON

SUN MORNING

TUE WED THU FRI SAT TEMPORARY

MIDDAY EVENING NIGHT COOL ON HEAT ON

BAT

SET PT

ROOM

OUTDOOR

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.

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.

System Press Look For This Response Switch This Key Position Key Down Key Released

OFF 03 Blank

COOL or 15 1st stage cooling, fan and

(with fan 15 2nd stage cooling also on. in AUTO)

OFF 06 Blank

(CHECK 12 See note A . EACH )

CHANGE

TO LAST

PERIOD

SKIP

PERIOD

PRESENT

SETTING

PRESENT

SETTING

AUTO SYSTEM LED on.

PRESENT

SETTING

PRESENT

SETTING

PRESENT

SETTING

WARMER

COOLER

AHEAD

BACK

COPY

FROM

COPY

PERIOD

07 Blank

15 Blank

15 2nd stage cooling off.

15 1st stage cooling, fan and

SYSTEM LED on.

02 Blank

05 Blank

04 Blank

01 Control microprocessor

mask no. and revision no.

00 Blank

POSITION) OFF 08 Blank

CANCEL

PERIOD

13 Interface microprocessor

DAY

no.

HEAT or 14 1st stage heating, fan AUTO and SYSTEM LED on. (with fan 14 2nd stage heating also on. in auto)

OFF 10 Blank

SET

HEAT/COOL

SET

PRESENT DAY/TIME

SET

PRESENT DAY/TIME

SET

PRESENT DAY/TIME

SET

PRESENT DAY/TIME

SET

PRESENT

DAY/TIME

SET

PRESENT

DAY/TIME

SET

PRESENT DAY/TIME

HOLD

TEMP

RUN

PROGRAM

09 Blank

14 Blank

14 3rd stage heating and AUX.

14 2nd stage heating also off.

14 1st stage heating, fan and

11 Normal operating display

mask no. and revision

HT. LED also on.

HT. LED off.

SYSTEM LED also off.

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.

19 68-0076—1

T8611M CHECKOUT • PROGRAMMING THE THERMOSTAT

First Digit Degrees Clock (Hrs.)

0F12 1F24 2C12 3C24

Second Digit System Switch Position

0 EM. HT., HEAT or OFF 1 AUTO 2 COOL

Third System Switch Sensor

Digit Position Location

0 COOL, AUTO or OFF Local 1 HEAT or EM.HT. Local 4 COOL, AUTO or COOL Remote 5 HEAT or EM. HT. Remote

M5346

Nominal Cycle Rate

Fourth (cph at 50% load

Digit for 3rd stage heat)

46 53

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.

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

NOTE: Check the glossary, page 30,

for definitions of unfamiliar words.

STEP 2 SETTING THE PROGRAM TIMES AND TEMPERATURES FOR ONE DAY

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.

Programming The Ther mostat

SET

PRESENT

DAY/TIME

DAY

TIME

AHEAD

BACK

PERIOD

SET

HEAT/COOL

DAY

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

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

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.

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.

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

MON

MORNING

MON

MORNING

MON

MORNING

TUE

M2701

M2702

M2703

HEAT

M2704

HEAT

M2704

HEAT

M2704

SET PT

T8611M

PROGRAMMING THE THERMOSTAT

Program the MIDDAY time and heating temperature if desired.

AHEAD

BACK

WARMER

COOLER

PERIOD

AHEAD

BACK

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

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

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.

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

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

MON

MORNING

MON

MORNING

MON

MIDDAY

MON

MIDDAY HEAT

HEAT

M2705

HEAT

M2706

HEAT

M2708

SET PT

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.

WARMER

COOLER

PERIOD

AHEAD

BACK

WARMER

COOLER

Press and hold until the display shows the desired temperature.

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.

MON

MIDDAY HEAT

MON

EVENING

MON

EVENING HEAT

MON

EVENING HEAT

M2709

HEAT

M2711

M2712

SET PT

21 68-0076—1

T8611M PROGRAMMING THE THERMOSTAT

Program the NIGHT time and temperature, if desired.

PERIOD

AHEAD

BACK

WARMER

COOLER

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.

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

MON

NIGHT HEAT

M2713

M2714

M2715

SET PT

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

SET

HEAT/COOL

WARMER

COOLER

PERIOD

WARMER

COOLER

PERIOD

heating. Press and release. The display shows

COOL, the preprogrammed cooling temperature and the programmed start time for NIGHT.

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.

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

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

MON

MORNING

MON

MORNING

MON

MIDDAY COOL

NIGHT COOL

COOL

M2716

M2717

M2718

M2719

M2720

SET PT

WARMER

COOLER

PERIOD

WARMER

COOLER

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

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

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 completes the program schedule for one day. Go to Step 3 to copy this program

MON

MIDDAY COOL

MON

EVENING COOL

MON

EVENING COOL

M2721

M2722

M2723

SET PT

ROOM

SET PT

ROOM

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

DAY

COPY

FROM

COPY

DAY

COPY

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

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

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.

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.

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

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

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.

MON

TUE

TUE WED

WED

WED THU

TUE MIDDAY

NIGHT HEAT

M2724

M2725

M2726

M2727

M2728

M2729

SET PT

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

PERIOD

DAY

SET

HEAT/COOL

AHEAD

BACK

PERIOD

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

Press and release to enter the programming mode.

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

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

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

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.

TUE MIDDAY HEAT

FRI

MIDDAY HEAT

FRI

MIDDAY HEAT

WARMER

COOLER

AHEAD

BACK

WARMER

COOLER

M2730

M2731

SET PT

23 68-0076—1

T8611M PROGRAMMING THE THERMOSTAT

SET

HEAT/COOL

PERIOD

COPY

FROM

COPY

DAY

COPY

RUN

PROGRAM

Press and release so COOL shows on the display.

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.

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.

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

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.

Repeat Step 4 as needed until all days are programmed.

MORNING

WARMER

COOLER

SUN FRI

COPY

DAY

TUE

MIDDAY

FRI

FRI SAT

COOL

M2732

M2733

M2734

M2735

SET PT

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

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.

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

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

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).

EM. HT: The thermostat controls only the backup heat. The heat pump is off.

HEAT: The thermostat controls the heating system.

OFF: Both the heating and cooling systems are off.

AUTO

EM. HT. HEAT OFF

AUTO

FAN

M2757

FAN

M2758

COOL

M2754

M2752

COOL

M2753

T8611M

PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT

Then set the system switch. (continued)

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

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.

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

EM. HT. HEAT OFF

AUTO

COOL

M2755

COOL: The thermostat controls the cool-

COOL

ing system.

EM. HT. HEAT OFF

AUTO

M2756

This completes the programming of the thermostat.

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

Operating The Thermostat

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:

SKIP

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.

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

CHANGE

TO LAST

PERIOD

Press and release. The display will show the name of the previous period and flash “temporary” until the next regularly scheduled period starts.

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:

WARMER

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

COOLER

time period starts.

TUE MIDDAY EVENING

TUE TEMPORARY

MORNING

M2736

M2737

TEMPORARY

HEAT

M2738

SET PT

To change back:

RUN

PROGRAM

Press and release to cancel any of the temporary settings.

TUE

MIDDAY

25 68-0076—1

M2739

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

DAY

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

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

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

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-

AHEAD

BACK

COPY

FROM

RUN

PROGRAM

HOLD TEMP

WARMER

COOLER

PRESENT

SETTING

RUN

PROGRAM

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

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.

Press and release to return to normal operation.

gram. Press and release.

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

Press and release to check the temperature setting.

TUE

MIDDAY

WARMER

COOLER

COPY

DAY

HEAT

M2740

HEAT

M2741

HEAT

M2742

M2743

SET PT

Press and release to cancel manual control.

CANCELING PROGRAM SETTINGS

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

Both the heating and cooling temperatures will be canceled.

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

PERIOD

DAY

CANCEL PERIOD

RUN

PROGRAM

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

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

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

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.

MON

WED

EVENING HEAT

NIGHT HEAT

M2744

M2745

M2746

M2747

SET PT

T8611M

OPERATING THE THERMOSTAT • OPERATION

Press and release to return to normal operation.

CHECKING THE PROGRAM TIMES AND TEMPERATURES

If desired, check all the stored settings

tion.

CHECKING THE CURRENT TEMPERATURE SETTING

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

PERIOD

DAY

RUN

PROGRAM

PRESENT

SETTING

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.

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

Press and release to return to normal opera-

time. Press and release. The display will show

the current temperature setting for several seconds, then revert to the room temperature.

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

FRI

NIGHT HEAT

FRI

EVENING

SAT

M2748

M2749

M2750

HEAT

M2751

SET PT

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.

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

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 conditions; occupants come home and wake up to comfort.

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

• 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

27 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.

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.

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

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.

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.

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.

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

NO ac POWER TO THERMOSTAT

THERMOSTA T INO P E RAT IVE CONDUCT SELF - TEST; SEE CHE CK OUT.

CHECK POWER TO HEAT PUMP OR AUXILIARY HEATING SYSTEM

–ON-OFF SWITCH –FUSE OR CIRCUIT BREAKER –LOOS E 24 V CONNECTION

-AT THERMOSTAT

-AT HEAT PUMP OR AUXILIAR Y HEATI NG SYSTEM

–INCORR E CT WI RING

-CHECK WIRING DI A GRAM

T8611M

PAR TIAL DISPLAY

NO DISPLAY

PRESENT SETTING APPEARS INACCURATE

ROOM T EMPERATURE DISPLAY APPEARS INACCURATE

PRESENT SETTING TOO LOW/HIGH

SYSTEM SWITCH ON THERMOSTAT IN WRONG POSITION

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

INCORR E CT WI RING CHECK CIRCUIT DIAGRA M .

HEAT PUMP OR AUXILIARY HEAT SYSTEM INOPERATIVE

INOPERATI VE T HER MO STAT

NO POWER T O T HER MO STAT

THERMOSTAT IN SELF-TEST MODE PRESS RUN PROGR AM KEY T W I CE.

THERMOSTAT MOUNTED INCORR ECTLY ON BASE

THERMOSTAT IS IN RECOVERY MO DE

THERMOSTAT HAS SEPARATE REMOTEMOUNT E D SENSOR

ADJUST TEMPER AT UR E BY PUSHING WARMER / COO LER KEYS.

R ESE T THERMOSTAT SYST EM SWIT CH.

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

CONSULT HEAT PUMP/AUXILIARY HEAT SYSTEM INSTRUCTIONS.

REPLACE THERMOSTAT.

CHECK THAT HEAT OR COOL SYSTEM POWER IS ON.

SEE INSTALLATION INS TRUCTIONS FOR CORRECT MOUNTING.

•

NORMAL OPERATION THERMOSTAT TURNS ON HEATING/COOLING EAR LY TO MEET T EMPERATURE SETTING AT PROGRAMMED TIMES.

•

RECOVERY CAN BE ENDED BY PUSHING WARMER / COO LER KEYS.

•

THERMOSTAT IS CONTROLLED BY TEMPERATUR E SENSED AT REMOTE SENS OR LOCATION.

•

CHECK TEMPERATURE AT R EMO T E SENSOR LOCATION.

•

MAKE SURE WIRING FROM THERMO STAT LOCATION TO REMOTE SENSOR LOCATION IS IN GOOD CONDITION.

ROOM T EMPERATURE IS NOT WHAT IS EXPECTED ON WEEKENDS

THERMOSTAT TEMPER AT UR E NEEDS TO BE ADJUSTED ON A REGULAR BASIS

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

DISPLAY FLASHES WHILE PROGRAMMING

DISPLAY F LA SHES DURING OPERATION

THERMOSTAT NOT PR O G RAMMED FOR WEEKENDS

WARMER / COO LER KEYS BEING USED TO ADJUST TEMPERATURE

BATTERI ES ARE INCOR RECTLY INSTALLED REMO VE AND REPLACE PER MARKINGS ON THERMOSTAT.

BATTERI ES ARE DEAD REPLACE BATTERI ES.

IMPROPER PROG RAM SEQUENCE

AUTOMATIC CHANGEOVER THER MO STAT HEATING OR COO LING T EMPERATURES CAN NOT BE SET CLOSER THAN 3°F

PROGRAMMING HAS BEEN LOST BECAUSE OF A POWER OUTAGE

REPRO G RAM FOR W EEKENDS PER INSTRUCTIONS.

REPRO G RAM THERMOSTAT TO MAKE PERMANENT CHANGE IN PROGRAM. W ARMER/ COO LER KEYS ARE TEMPORARY UNLESS PERIOD KEY IS PRESSED FIRST.

CHECK HOM E OWNERS MANUAL F OR CORRECT P ROGRA M SEQUENCE.

SET HEATING AND COOLING TEMPERATURES 3°F OR MORE APAR T .

REPRO G RAM ACCORDING TO PROGR AMMI NG INSTRUCTIONS (MAKE SURE BATTER I ES ARE INSTALLED).

M1020A

29 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).

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.

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.

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.

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.

Setup

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

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.

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:

Start Temperature

Period Time Heating Cooling

MORNING 6:00 AM 70° F78° F MIDDAY - - - - - -No program - - - - - - - - - EVENING - - - - - -No program - - - - - - - - - NIGHT 10:00 PM 60° F78° F

Program

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

Recovery

The time when the thermostat operates the heating or air

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.

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.

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.

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 Home and Building Control Helping You Control Your World

Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, MN 55422 Scarborough, Ontario

Printed in U.S.A.

M1P 2V9

QUALITY IS KEY

Honeywell T8611M User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual