Honeywell T451A User manual

163-2051—4J. H. • Rev. 9-92 • ©Honeywell Inc. 1992 • Form Number 63-2051—4

T451, T651, T694 Thermostats provide on-off

control of valves, fans, motors, contactors, electric

heat elements, duct furnaces and fan coil units in

heating/cooling systems. Switching subbases pro-

vide manual control of heating, cooling and fan.

T451A,T651A,T694A,B,D,F

Light Duty

LineVoltageThermostats

■Thermostats use spst or spdt snap switches activated

by bimetal sensor.

■T451A/T651Amountonstandardverticalorhorizon-

tal junction box.

■Optionsincludeadjustablerangestops,lockingcover,

concealedsetpoint,lockingsetpoint,positiveoffcon-

trol, cover thermometer.

■T451A provides heating control only.

■T651A provides heating and cooling control.

■T694A,B,D,Fsuppliedwithswitchingsubbasetopro-

vide manual control of heating, cooling and fan.

■Q473A,B switching subbase available for T451A/

T651A.

■Automatic cooling anticipator for 120, 208, 240 and

277 Vac.

T694A

T694B,D,F

T451A,

T651A

CONTENTS

Specifications ................................................. 2

Ordering Information..................................... 2

Installation ..................................................... 4

Checkout......................................................... 7

T451A, T651A, T694A,B,D,F

SPECIFICATIONS • ORDERING INFORMATION

Specifications

SUPER TRADELINE MODEL

TRADELINE models are selected and packaged to provide

ease of stocking, ease of handling and maximum replace-

ment value. TRADELINE model specifications are the

same as those of standard models except as noted below.

SUPER TRADELINE MODEL AVAILABLE:

T651A2028 Light Duty Line Voltage Thermostat.

FEATURES:

—Temperature scale range 35°F to 95°F.

—Spdtswitchbreaksheatingcontactsandmakescooling

contacts on temperature rise.

—Automatic cooling anticipator for 120, 208, 240 and

277 Vac.

—Vertical faceplate with Fahrenheit scale and ther-

mometer.

—Horizontal faceplate with Fahrenheit scale and ther-

mometer.

—Blank vertical faceplate.

—Blank horizontal faceplate.

—Wallplate.

—Adjustable range stops.

—Locking cover screw.

STANDARD MODELS:

Model Changeover

Number Application System Switch Switch Fan Switch

T451A2007aHeating only. — — —

T451A2015 Heating only with positive OFF. — — —

T651A2028aHeating/cooling. — — —

T694A2002 Heating/cooling. OFF position breaks ON-OFF — HI-MEDIUM-LO

fan circuit.

T694B2001 Heating/cooling. OFF position breaks ON-OFF HEAT-COOL HI-MEDIUM-LO

cooling and fan circuits.

T694D2009 Heating/cooling. Heating circuits isolated ON-OFF HEAT-COOL HI-MEDIUM-LO

from cooling circuits. OFF position

breaks all control circuits except heat.

T694F2007 Heating/cooling. Heating circuits isolated ON-OFF HEAT-COOL HI-MEDIUM-LO

from cooling circuits. OFF position breaks

all power to fan and thermostat.

aWith thermometer.

Ordering Information

When purchasing replacement and modernization products from your TRADELINE® wholesaler or your distributor, refer to the

TRADELINE Catalog or price sheets for complete ordering number, or specify—

1. Order number.

2. Accessories, if desired.

3. Order additional components and system accessories separately.

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

Golden Valley, MN 55422-4386 (612) 951-1000

In Canada—Honeywell Limited/Honeywell Limitee, 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.

363-2051—4

T451A, T651A, T694A,B,D,F

SPECIFICATIONS

ELECTRICAL RATINGS (A):

Voltage (Vac)

120 208/240/277

Full Load 8 4a

Locked Rotor 48 24

aWider temperature differential ranges can occur when

used in cooling applications with current draws that are

more than four amps. If a wider differential range is

unacceptable, use a T6051 Heavy Duty Line Voltage

Thermostat for a smaller differential range.

Pilot Duty: 125 VA.

7.2A Resistive: heating contacts only.

TEMPERATURE SETTING RANGE: 35°F to 95°F [2°C

to 35°C] (with range stops removed).

STORAGE TEMPERATURE: -40°F to 150°F [-40°C to

66°C].

FIXED DIFFERENTIAL: 2°F [1°C].

SWITCHING ACTION:

T451: Spst. Contacts make on temperature fall.

T651: Spdt. Heating contacts break and cooling contacts

make on temperature rise.

T694: Spdt. Heating contacts break and cooling contacts

make on temperature rise.

FIELD WIRING CONNECTIONS: No. 10 screw terminals

on T451A/T651A; color-coded leads on T694 models.

DIMENSIONS: See Figs. 1 and 2.

FINISH: Brushed champagne gold and dark pewter face-

plate; beige and brown case.

UNDERWRITERS LABORATORIES INC.: Listed.

ACCESSORIES:

Q473A2006 Switching Subbase: Use with T651A for

HEAT-OFF-COOL manual system switching.

Q473B2005 Switching Subbase: Use with T451A/

T652A for AUTO/OFF switching in heating only or

cooling only applications.

220124A Faceplate vertical, Fahrenheit scale, with

thermometer.a

220124B Faceplate vertical, Celsius scale, with ther-

mometer.

220124C Faceplate, horizontal, Fahrenheit scale, with

thermometer.a

220124D Faceplate, horizontal, Celsius scale, with ther-

mometer.

220125A Faceplate, horizontal, Fahrenheit scale, with-

out thermometer.

220125B Faceplate, vertical, Fahrenheit scale, without

thermometer.

220125C Faceplate, horizontal, Celsius scale, without

thermometer.

220125DFaceplate,vertical,Celsiusscale, withoutther-

mometer.

220126AFaceplate,horizontal,blank(concealedsetpoint,

without thermometer).a

220126B Faceplate, vertical, blank (concealed setpoint,

without thermometer).a

220213 Wallplate, covers old T451A/T651A wall marks

when installing new T451A/T651A.a

199242 Wallplate, covers old T694 wall marks when

installing new T694.

aSupplied with SUPER TRADELINE model T651A.

Fig. 1—T451A, T651A mounting dimensions in in. [mm].

417

[114]

213

16

[70]

60 70

40 50 60 70 80 90

COOL HEAT COM

11

8

[22]

113

16

[

]

39

32

[83]

13

4

[45]

15

16

[24]

17

32

[14]

11

8

[37]

115

32

[35]

9

16

[14]

M6130

T451A, T651A, T694A,B,D,F

INSTALLATION

Fig. 2—T694A,B,D,F mounting dimensions in in. [mm].

113

32

[

]

15

32

[35]

47

[124]

429

32

[125 ]

60 70

39

32

[83]

19

16

[40]

3

[76]

17

8

[48]

SYSTEM

OFF

HEAT

COOL

FAN

MED

LOW

M6129

(T694B SHOWN)

Installation

WARNING

Donotuseonelectricheat.Possiblefire hazard if

T694A,B,D used on electric heat. T694F can be

used on electric heat.

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 in the instructions and on

the product to make sure the product is suitable for your

application.

3. Installer must be a trained, experienced service

technician.

4. After installation is complete, check out product op-

eration as provided in these instructions.

CAUTION

Disconnect power supply before making wiring

connections to prevent electrical shock and equip-

ment damage. Use copper wire only.

LOCATION

Select the same location as control to be replaced, or

select a new location about 5 ft. [1.5 m] above the floor, on

an inside wall where there is good air circulation at average

room temperature.

Do not install the thermostat where it may be affected by:

•drafts, or dead spots behind doors and in corners.

•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.

WIRING AND MOUNTING

Disconnectpowersupplybeforemakingwiringconnec-

tions to prevent electrical shock and equipment damage.

All wiring must comply with applicable electrical codes,

ordinances and regulations. Use copper wire only. Make

surethatthermostatelectricalratingissufficientforcurrent

requirements of controlled equipment, and that listed volt-

age matches power supply.

T451A/T651A THERMOSTATS (Fig. 3)

T451A/T651AThermostatsmountverticallyon a 2 x 4

in. or 4 x 4 in. junction box. See Fig. 3. Use 2 x 4 in. cover

plate with 4 x 4 in. junction. For horizontal mounting, the

appropriate horizontal faceplate is required. Horizontal

with thermometer and horizontal blank faceplates are

packaged with the T651A2028 SUPER TRADELINE

model. For additional faceplates or T451 applications, see

Accessories. When replacing old style T451A/T651A, use

a wallplate to cover previous wall marks. This wallplate is

packaged with the T651A2028 SUPER TRADELINE

model. For T451 applications, see Accessories.

563-2051—4

T451A, T651A, T694A,B,D,F

INSTALLATION

1. Before mounting thermostat, connect system wiring

to proper terminals at rear of thermostat. Follow equip-

ment manufacturer instructions or refer to Fig. 4 for

typical system hookup.

2. Remove cover assembly from thermostat. Attach

thermostat to junction box with two screws provided. Re-

place cover assembly. See Fig. 3.

3. Use 1/16 hex Allen wrench to install Allen locking

cover screw.

Fig. 3—Mounting T451A/T651A.

40 50 60 70 80 90

M6131

60 70

USE 2x4

JUNCTION

BOX

MOUNTING

SCREWS (2)

TABS HOLD

COVER ASSEMBLY

AT TOP (SNAP

IN AT BOTTOM)

220213 WALLPLATE

ACCESSORY

(OPTIONAL)

(COVERS OLD T651A

WALL MARKS WHEN

INSTALLING NEW T651A)

T694A,B,D,F THERMOSTATS (Fig. 5)

All T694A,B,D,F Thermostats mount vertically on a 2 x

4 in. or 4 x 4 in. junction box. See Fig. 5. Use 2 x 4 in. cover

plate with 4 x 4 in. junction box.

1. Before mounting, connect system wiring to proper

color-coded leads at rear of thermostat. Follow equipment

manufacturer instructions or refer to Figs. 6-9 for typical

system hookups.

2. Remove thermostat cover assembly. Attach thermo-

stat to junction box with two screws provided. Replace

thermostat cover assembly.

Fig. 4—T652A in heating-cooling system.

Fig. 5—Mounting T694A,B,D,F.

60 70

SYSTEM

OFF

HEAT

COOL

FAN

MED

LOW

M6135

COVER PLATE

4x4 JUNCTION

BOX

USE 2x4 OR 4x4

JUNCTION BOX

(T694B SHOWN)

MOUNTING

SCREWS (2)

TABS HOLD

COVER ASSEMBLY

AT TOP (SNAP

IN AT BOTTOM)

T451A, T651A, T694A,B,D,F

INSTALLATION

Fig. 6—T694A in heating-cooling system with

independent valve and fan circuits.

Fig. 7—T694B connected for positive-off switch-

ing in COOL position.

Fig. 8—T694D with isolated switching for heating

and cooling.

Fig. 9—T694F with positive-off position.

763-2051—4

T451A, T651A, T694A,B,D,F

CHECKOUT

Checkout

After the thermostat is wired and mounted, perform the

following system checkout procedure.

T451/T651

IN HEATING APPLICATION:

1. Close disconnect switch (if used).

2. Adjust setpoint above room temperature and check

that heating system turns on.

3. Adjust setpoint below room temperature and check

that heating system turns off.

4. Adjust thermostat for desired room temperature.

IN COOLING APPLICATION:

1. Close disconnect switch (if used).

2. Adjust setpoint below room temperature and check

that cooling system turns on.

3. Adjust setpoint above from temperature and check

that cooling system turns off.

4. Adjust thermostat for desired room temperature.

NOTE: Wider temperature differential ranges can occur

when used in cooling applications with current draws

that are more than four amps. If a wider differential

range is unacceptable, use a T6051 Heavy Duty Line

Voltage Thermostat for a smaller differential range.

T694

NOTE: System switch must be in ON position to check

out system.

1. Close the disconnect switch (if used) and press

HEAT switch; adjust setpoint above room temperature

and check that heating system turns on.

2. Adjust setpoint below room temperature and check

that heating system turns off.

3. Press COOL switch; adjust setpoint below room

temperature. Check that cooling system turns on and fan

runs continuously.

4. Press fan LO, MED, HI switches and check that fan

control operates properly.

5. Adjust setpoint above room temperature and check

that cooling system turns off. Fan operates continuously.

6. Adjust thermostat for desired room temperature.

If questions arise regarding this product, contact your

distributor or local Honeywell representative.

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

M1P 2V9

Printed in U.S.A.

QUALITY IS

KEY

This manual suits for next models

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