Honeywell T921A User Manual

60-2242—2

T921A,B,E-G

SPECIFICATIONS • ORDERING 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 number.
2. Scale range.
3. Accessories, if desired.

If you have additional questions, need further information, or want to comment on our products or services, please write or phone:

1. You local Honeywell Home and Building Control Sales Office (check the white pages of the phone directory).
2. Home And Building Control Customer Satisfaction

Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422 1-800-468-1502
(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.

Specifications

TRADELINE

MODELS

TRADELINE

models are selected and packaged to

provide ease of stocking, ease of handling and maximum
replacement value. TRADELINE

model specifications

are the same as those of the standard models except as noted
below.
TRADELINE

MODEL AVAILABLE:

T921A Thermostat for vertical or horizontal mounting.

TEMPERATURE RANGE AND SCALE:

to 84

F [13

to 29

ADDITIONAL FEATURES:

• TRADELINE

packed with cross-reference label

and special TRADELINE

instructions.

• T6051A may be used in electric heat systems.
• They all include slotted sides and an add-on faceplate

to allow the thermostat to be mounted horizontally.
They also include the 127246A Adapter Plate As-
sembly for vertical mounting on a horizontal conduit
box or for horizontal mounting on a vertical conduit
box.

STANDARD MODEL
MODELS:

T921A: Heating or cooling applications.
T921B: Is the same as the T921A but includes a cool-

heat changeover switch.

T921E: Includes a switch and heater that provide a night

setback of approximately 10

F [5.5

C].

T921F: Includes an spdt low voltage Class 2 auxiliary

switch that operates at the low end of the throttling
range.

T921G: Includes an spdt low voltage Class 2 auxiliary

switch that operates at the high end of the throttling
range.

SETTING ADJUSTMENT RANGE:

T921A,B,E-G: 56

to 84

F [13

to 29

C].

T921A,B,E-G: 13

to 29

C [56

to 84

F].

T921A: 42

to 75

F [ 5

to 24

C].

T921A,B: 66

to 95

F [19

to 35

C].

THERMOMETER: Bimetal. Scale ranges T921A only:

to 75

F [7

to 24

C]. All other models: 60

to 90

[16

to 32

C], 15

to 35

C [59

to 95

F]. T921A is also

available with a blank cover and no thermometer.

AUXILIARY SWITCH DIFFERENTIAL:

T921F: 2

F [1

C].

T921G: 1

F [0.5

C].

THROTTLING RANGE:

Fixed.
T921A: 2.5

F [1

C] midscale.

T921B,E: 4

F [2

C].

T921F: 6

F [3

C].

T921G: 5

F [2.5

C].

Variable.
T921A model available with potentiometer for 5

F [2.5 to 3

C] throttling range.

ELECTRICAL RATINGS:

Voltage: 24 to 30 Vac.
Auxiliary Switch Contact Rating (When Used For Pilot

Duty): 100 VA at 30 Vac.

DIMENSIONS:

Refer to Fig. 1.

ACCESSORIES (ORDER SEPARATELY):

127246A Adapter Plate Assembly for mounting all mod-

els vertically on a horizontal conduit box. (T921
models are shipped with a faceplate for vertical mount-
ing.)
When mounting the T921A,B,E horizontally, see
Table 1 to order the faceplate with the appropriate
scale. NOTE: Do not mount the T921F,G horizon-
tally.

34297B Thermostat Guard Assembly and 138541A

Mounting Plate.

133722A Thermostat Guard (clear plastic cover).
133723A Thermostat Guard (beige plastic cover).