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AT120A-E; AT140A-E; AT150A,B,D-F;
AT160B; AT175A-D,F Transformers
APPLICATION
These general purpose transformers provide power to 24 Vac
circuits. They are typically used in heating/cooling control
systems, but can be used in any application that doesn't
exceed the load ratings.
FEATURES
• AT120 is rated at 20 VA.
• AT140 is rated at 40 VA.
• AT150 is rated at 50 VA.
• AT160 is rated at 60 VA.
• AT175 is rated at 75 VA.
• All models meet National Electrical Code Class 2 not wet,
Class 3 wet transformer requirements.
• All models conform to Underwriters Laboratories Inc.
Standard UL 1585.
• Color-coded leadwires for primary connections and screw
terminals for secondary connections, fixed 1/4 inch
(6 mm) male quick-connects or color-coded leadwires for
both primary and secondary, are standard.
• Models available with stripped leadwires, leadwires with
variety of terminals, or special terminations as required on
both primary and secondary.
M38595
• Mounting options include clamp mounting on outlet box
knockout, plate mounting, foot mounting, panel
mounting, conduit/panel and a combination.
• Models available for 120V, 240V, 277V, 480V, 120/240V,
208/240V, 277/480V, 120/208/240V, 208/240/480V, or
208/277/480V supply at 60 Hz.
• "F" models include a button for manually resetting the
circuit breaker.
Application ..........................................................................
Features ..............................................................................
Specifications .....................................................................
Installation ..........................................................................
Checkout ............................................................................. 12
PRODUCT DATA
Contents
1
1
2
8
68-0054-06
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Summarization of Contents
APPLICATION
General Purpose Transformers
These general purpose transformers provide power to 24 Vac circuits for heating/cooling systems or other applications within load ratings.
FEATURES
Product Specifications
Details VA ratings, compliance with UL 1585, NEC Class 2/3 requirements, and available leadwire/terminal options.
Mounting and Voltage Options
Covers various mounting styles, primary voltage options (120-480V), and circuit breaker reset feature on 'F' models.
SPECIFICATIONS
Electrical Ratings and Model Details
Provides electrical ratings, primary/secondary voltage, output ratings, and specific model details like 'F' voltage.
Wiring and Mounting Configurations
Details wiring connections (leadwires, quick-connects, terminals) and various mounting means (A-F models).
Regulation and Overcurrent Protection
Explains transformer regulation curves and overcurrent protection methods for different models (inherent, fusible link, circuit breaker).
Approvals and National Electrical Code
Lists UL approvals (LISTED, RECOGNIZED) and NEC compliance for transformer models.
INSTALLATION
General Installation Precautions
Emphasizes reading instructions, checking ratings, installer qualifications, and system checkout.
Foot Mounting
Instructions for foot mounting 'A', 'B', and 'F' models using screws through mounting feet.
Plate Mounting
Details plate mounting for 'A' and 'D' models, including options for primary end bell or lamination mounting.
Outlet Box Mounting
Mounting transformer and plate on outlet boxes, including through knockout methods for 'A' and 'C' models.
Panel Mounting
Guidance for mounting 'E' models inside a panel cutout using screws.
Conduit/Panel Mounting
Procedure for mounting transformer on a plate or panel using conduit connector and lock nut.
WIRING
Primary and Secondary Connections
Details primary voltage connections, handling multitap models, and making secondary connections to the 24 Vac control circuit.
CHECKOUT
Voltage Check Procedure
Steps for verifying primary and secondary voltages after installation, including troubleshooting for incorrect readings.
Circuit Breaker Reset
Instructions for resetting the circuit breaker on AT150F and AT175F models and troubleshooting persistent tripping.
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