Honeywell T451A Thermostat User Manual

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T451A, T651A, T694A,B,D,F

Light Duty

LineVoltage Thermostats

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

T694B,D,F

T694A

■

T451A provides heating control only.

■ Thermostats use spst or spdt snap switches activated

by bimetal sensor.

T651A provides heating and cooling control.

■

T451A/T651A mount on standard vertical or horizon-

tal junction box.

T694A,B,D,Fsuppliedwithswitchingsubbasetopro-

vide manual control of heating, cooling and fan.

Optionsincludeadjustablerangestops,lockingcover,

concealedsetpoint, lockingsetpoint, positiveoffcon-

trol, cover thermometer.

■

Q473A,B switching subbase available for T451A/

T651A.

Automatic cooling anticipator for 120, 208, 240 and

277 Vac.

CONTENTS

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

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

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

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

J. H. • Rev. 9 -1 92 • ©Honeywell Inc. 1992 • Form Number 66 33 -- 22 00 55 11 —— 4

T451A, T651A, T694A,B,D,F

SPECIFICATIONS • ORDERING INFORMATION

Specifications

Automatic cooling anticipator for 120, 208, 240 and

—

SUPER TRADELINE MODEL

277 Vac.

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.

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.

SUPER TRADELINE MODEL AVAILABLE:

T651A2028 Light Duty Line Voltage Thermostat.

FEATURES:

—

Temperature scale range 35° F to 95° F.

Spdtswitchbreaksheatingcontactsandmakescooling

contacts on temperature rise.

STANDARD MODELS:

Model

Number

T451A2007^aHeating only.

Changeover

Application

System Switch

Switch

Fan Switch

—

T451A2015

T651A2028^aHeating/cooling.

Heating only with positive OFF.

—

T694A2002

T694B2001

T694D2009

Heating/cooling. OFF position breaks

fan circuit.

ON-OFF

—

HI-MEDIUM-LO

Heating/cooling. OFF position breaks

cooling and fan circuits.

ON-OFF

HEAT-COOL HI-MEDIUM-LO

Heating/cooling. Heating circuits isolated

from cooling circuits. OFF position

breaks all control circuits except heat.

T694F2007

Heating/cooling. Heating circuits isolated

from cooling circuits. OFF position breaks

all power to fan and thermostat.

ON-OFF

HEAT-COOL HI-MEDIUM-LO

With 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—

. Order number.

. Accessories, if desired.

. 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).

. 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.

T451A, T651A, T694A,B,D,F

SPECIFICATIONS

ELECTRICAL RATINGS (A):

FINISH: Brushed champagne gold and dark pewter face-

plate; beige and brown case.

Voltage (Vac)

208/240/277

4^a

120

UNDERWRITERS LABORATORIES INC.: Listed.

Full Load

ACCESSORIES:

Locked Rotor

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.

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.

20124A Faceplate vertical, Fahrenheit scale, with

thermometer.^a

Pilot Duty: 125 VA.

.2A Resistive: heating contacts only.

220124B Faceplate vertical, Celsius scale, with ther-

mometer.

20124C Faceplate, horizontal, Fahrenheit scale, with

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

to 35° C] (with range stops removed).

thermometer.^a

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

mometer.

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

220125A Faceplate, horizontal, Fahrenheit scale, with-

out thermometer.

66° C].

20125B Faceplate, vertical, Fahrenheit scale, without

thermometer.

FIXED DIFFERENTIAL: 2° F [1° C].

220125C Faceplate, horizontal, Celsius scale, without

thermometer.

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.

220125D Faceplate, vertical, Celsius scale, without ther-

mometer.

220126AFaceplate, horizontal, blank(concealedsetpoint,

without thermometer).^a

220126B Faceplate, vertical, blank (concealed setpoint,

without thermometer).^a

FIELD WIRING CONNECTIONS: No. 10 screw terminals

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

220213 Wallplate, covers old T451A/T651A wall marks

when installing new T451A/T651A.^a

199242 Wallplate, covers old T694 wall marks when

DIMENSIONS: See Figs. 1 and 2.

installing new T694.

Supplied with SUPER TRADELINE model T651A.

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

[14]

[

35]

[

114]

[83]

COOL HEAT COM

50 60 70 80 90

[45]

[37]

[

70]

[22]

[

24]

[14]

[

M6130

48]

63-2051—4

T451A, T651A, T694A,B,D,F

INSTALLATION

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

[

48]

SYSTEM

OFF

HEAT

COOL

3 9

76]

[

124]

[

83]

FAN

MED

LOW

35]

[

125 ]

[

40]

[

(T694B SHOWN)

M6129

[

36]

Installation

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

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

WARNING

•

hot or cold air from ducts.

Do not use on electric heat. Possible fire hazard if

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

used on electric heat.

radiant heat from sun or appliances.

concealed pipes and chimneys.

unheated (uncooled) areas behind the thermostat,

such as an outside wall.

WHEN INSTALLING THIS PRODUCT…

. Read these instructions carefully. Failure to follow

them could damage the product or cause a hazardous

WIRING AND MOUNTING

Disconnect power supply before making wiring connec-

tions to prevent electrical shock and equipment damage.

All wiring must comply with applicable electrical codes,

ordinances and regulations. Use copper wire only. Make

sure that thermostat electrical rating is sufficient for current

requirements of controlled equipment, and that listed volt-

age matches power supply.

condition.

. Check the ratings given in the instructions and on

the product to make sure the product is suitable for your

application.

. Installer must be a trained, experienced service

technician.

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

eration as provided in these instructions.

T451A/T651A THERMOSTATS (Fig. 3)

T451A/T651A Thermostats mount vertically on 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.

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.

T451A, T651A, T694A,B,D,F

INSTALLATION

. Before mounting thermostat, connect system wiring

2. Remove thermostat cover assembly. Attach thermo-

stat to junction box with two screws provided. Replace

thermostat cover assembly.

to proper terminals at rear of thermostat. Follow equip-

ment manufacturer instructions or refer to Fig. 4 for

typical system hookup.

. Remove cover assembly from thermostat. Attach

thermostat to junction box with two screws provided. Re-

place cover assembly. See Fig. 3.

Fig. 4—T652A in heating-cooling system.

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

cover screw.

Fig. 3—Mounting T451A/T651A.

20213 WALLPLATE

ACCESSORY

(

OPTIONAL)

(

COVERS OLD T651A

WALL MARKS WHEN

INSTALLING NEW T651A)

Fig. 5—Mounting T694A,B,D,F.

TABS HOLD

COVER ASSEMBLY

AT TOP (SNAP

IN AT BOTTOM)

MOUNTING

SCREWS (2)

COVER PLATE

x4 JUNCTION

BOX

TABS HOLD

COVER ASSEMBLY

AT TOP (SNAP

IN AT BOTTOM)

USE 2x4

JUNCTION

BOX

SYSTEM

MOUNTING

SCREWS (2)

50 60 70 80 90

OFF

HEAT

COOL

FAN

M6131

MED

LOW

USE 2x4 OR 4x4

JUNCTION BOX

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

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

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

(T694B SHOWN)

plate with 4 x 4 in. junction box.

. 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.

M6135

63-2051—4

T451A, T651A, T694A,B,D,F

INSTALLATION

Fig. 6—T694A in heating-cooling system with

independent valve and fan circuits.

Fig. 8—T694D with isolated switching for heating

and cooling.

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

ing in COOL position.

Fig. 9—T694F with positive-off position.

T451A, T651A, T694A,B,D,F

CHECKOUT

Checkout

After the thermostat is wired and mounted, perform the

following system checkout procedure.

T694

NOTE: System switch must be in ON position to check

out system.

T451/T651

IN HEATING APPLICATION:

. Close disconnect switch (if used).

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.

2. Adjust setpoint above room temperature and check

that heating system turns on.

. Adjust setpoint below room temperature and check

that heating system turns off.

. Adjust thermostat for desired room temperature.

IN COOLING APPLICATION:

. Close disconnect switch (if used).

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

control operates properly.

. Adjust setpoint above room temperature and check

that cooling system turns off. Fan operates continuously.

. Adjust thermostat for desired room temperature.

2. Adjust setpoint below room temperature and check

that cooling system turns on.

. Adjust setpoint above from temperature and check

that cooling system turns off.

. Adjust thermostat for desired room temperature.

If questions arise regarding this product, contact your

distributor or local Honeywell representative.

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.

63-2051—4

Home and Building Control

Honeywell Inc.

Home and Building Control

Honeywell Limited—Honeywell Limitée

740 Ellesmere Road

Helping You Control Your World

985 Douglas Drive North

Golden Valley, MN 55422

Scarborough, Ontario

M1P 2V9

QUALITY IS

KEY

Printed in U.S.A.

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