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AT120A, AT140A, AT150A, AT175A
Universal Transformers
APPLICATION
These transformers are for use in 24 Vac nominal control
circuits. They are typically used in heating/cooling control
systems but can be used in any application that does not
exceed the load ratings. They meet National Electrical
Input
Model
Voltage
Number
(60 Hz)
AT120A
120/208/
240
AT140A
120
120/208/
240
120/240
208/240
AT150A
120/208/
240
AT175A
120/208/
240
INSTALLATION
When Installing this Product ...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous 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.
Table 1. Model Specifications.
Primary
Wiring
Connections
9 in. leads
27.0
9 in. leads
27.0
9 in. leads
27.5
9 in. leads
27.5
Code Class 2 "not wet" and Class 3 "wet" requirements
and are Underwriters Laboratories (UL) Inc. listed under
UL 1585. They can be mounted through a 7/8 in. knock-
out on the accessory mounting plate (included), or with
the integral mounting feet. See Table 1 for additional
specifications.
Secondary
Voltage
At Rated
Open
Power
Circuit
Output
24.0
24.0
24.0
24.0
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Electrical Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power supply before beginning
installation.
INSTALLATION INSTRUCTIONS
Output Rating at
Wiring
100 Percent Power
connections
Screw
20 VA
terminals
Screw
40 VA
terminals
Screw
50 VA
terminals
Screw
75 VA
terminals
Factor
69-0251-3
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Summary of Contents for Honeywell AT120A
- Page 1 AT120A, AT140A, AT150A, AT175A Universal Transformers INSTALLATION INSTRUCTIONS APPLICATION Code Class 2 “not wet” and Class 3 “wet” requirements These transformers are for use in 24 Vac nominal control and are Underwriters Laboratories (UL) Inc. listed under circuits. They are typically used in heating/cooling control UL 1585.
- Page 2 AT120A, AT140A, AT150A, AT175A UNIVERSAL TRANSFORMERS Mounting The transformer can be mounted in one of three ways: — foot mounting. PLATE MOUNTED AT CLAMP ON PRIMARY END BELL — plate mounting. MOUNTING PLATE — mounting through outlet box knockout hole.
- Page 3 AT120A, AT140A, AT150A, AT175A UNIVERSAL TRANSFORMERS WITH RAISED PORTION OF KNOCKOUTS FACING YOU: PRY UP TOP SECTION OF LARGE KNOCKOUT BY INSERTING SCREWDRIVER FIRST AT ONE SIDE OF SLOT AND THEN AT THE OTHER SIDE. M12126 Fig. 3. When screw is tightened, clamp holds plate on transformer.
- Page 4 Scarborough, Ontario M1V 4Z9 customer.honeywell.com By using this Honeywell literature, you agree that ® U.S. Registered Trademark Honeywell will have no liability for any damages arising out © 2005 Honeywell International Inc. of your use or modification to, the literature. You will 69-0251-3 G.H.