Honeywell T451, T651 User Manual

95C-10903-1

T451, T651

Motor-Rated Precision Thermostats

PRODUCT DATA

The T651 thermostat provides direct, accurate line voltage
control of inductively-rated heating, ventilating, or cooling
equipment used in commercial or industrial environments.

The T451 provides precision line voltage control of motor­rated electric, gas or oil heating equipment.

APPLICATION

FEATURES

• Deluxe styling for commercial buildings.

• Industrial grade MICRO SWITCH™ mechanism
rated 1/2 hp inductive, 5 kW resistive.

• Vertical mounting on 2” x 4” NEMA-standard
single-gang outlet box.

• High-sensitivity, vapor-filled stainless steel dual
diaphragm sensing element.

• Engineering plastic base to isolate sensor from
switch heat and minimize droop.

• CSA Certified, UL Listed.

• Altitude compensation.

• 44°F (7°C) “frost protection” setting for heating
application, independent of calibration or altitude.

• Color-coded leadwire connections.

• Range stops/locking cover security features for
public areas.

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Setting and Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . 4

Contents

CL 4-01 • © Honeywell Limited/Limitée 2001

95C-10903-1

T451, T651 MOTOR-RATED PRECISION THERMOSTATS SPECIFICATIONS • ORDER INFORMATION

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. Model

2. Electrical load(s)

3. Accessories.
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 or phone directory).

2. Home and Building Control Customer Satisfaction

Honeywell Inc., 1885 Douglas Drive North.
Minneapolis, MN 55422 [phone]

3. In Canada— Honeywell Limited, 35 Dynamic Drive, Toronto, ON M1V 4Z9, 1-800-405-9835.
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.

Important: The specifications given in this publication do

not include normal manufacturing tolerances. Therefore this
unit may not exactly match the listed specifications . This
product is tested and calibrated under closely controlled
conditions, and some minor differences in performance can
be expected if these conditions are changed.

Models:

T451A SPST and T451B DPST (with positive off) for
heating only.
T651A SPDT for heating/cooling.

Control Range:

44 - 86°F (7 - 28°C) for models T451A, T651A.
50 - 86°F (10 - 28°C) for model T451B.

Sensing Element: Vapor-filled dual diaphragm.
Differential: 2°F (1°C)
Droop: 2°F @ mid load range.
Barometer Sensitivity: 1/8°F/”wc (0.3°C/kPa).
Thermometer: 50 - 90°F (10 - 30°C) in 10°F (5°C) increments.
Electrical Ratings:

50/60Hz 120 V 208V 240V 277V
Full Load 9.8A 5.6A 4.9A 4.2A

Locked Rotor 58.8A 33.6A 29.4A 25.2A
Pilot Duty 125 VA
Resistive 22A Non Inductive 19ANI
Heating Only 2.5kW 4.5kW 5kW

Finish: Classic beige-and-light gold standard.

White models available.

Mounting:

Mounts directly on vertical, single-gang NEMA Standard
(2” x 4”) electrical box.

Wiring Connections:

6” (150 mm) leadwires suitable for connecting to aluminum
conductors wiring if used with approved special service
CO/ALR solderless wire connectors. Leadwires color­coded red for heating, blue for cooling, black for common.

Approvals:

Canadian Standards Association Certified; File No. LR1322
Performance Certified for electric heating per C273.4A.
UL file E47434.

Accessories:

272804A Range stops and cover locking assembly

(included in selected models only).

220213 Wallplate, covers old T451/T651 (1000 series)

wall marks.

TG511 Thermostat guard for security and protection.

Fig. 1 — Dimensions of T451, T651 in inches (mm):

2