AT150F, AT175F Universal Circuit Breaker Transformers
Contents
1. product fear operation as provided in these instructions FOR PRIMARY AND SECONDARY CONNECTIONS A CAUTION Disconnect power supply before beginning installation to prevent electrical shock or equipment damage The transformer can be foot mounted or conduit panel mounted Mounting MOUNTING Foot Mounting FOOT 2 Mount the transformer using screws not included through er the four 3 16 in x 3 8 in holes in the mounting feet See Fig 1 Make line voltage primary connections within an p approved enclosure Fig 1 Foot mounting U S Registered Trademark I 69 1014 1 Copyright 1996 Honeywell Inc All Rights Reserved M6905 AT150F AT175F UNVIVERSAL CIRCUIT BREAKER TRANSFORMERS Conduit Panel Mounting Mount the transformer on a plate or panel not included with a 7 8 in knockout The transformer has a 1 2 14 NPSM conduit connector and lock nut 1 With the conduit connector side of the transformer facing the plate thread the leadwires through the plate knockout 2 Insert the connector in the knockout 3 While holding the plate in place assemble and tighten the lock nut to fasten the transformer securely See Fig 2 Avoid damaging the leadwires with the screwdriver 4 Make line voltage primary connections within an approved enclosure MOUNTING PLATE NOT RESET INCLUDED BUTTON LEADWIRES FOR PRIMARY AND SECONDARY CONNECTIONS CO2. Honeywell AT150F AT175F Universal Circuit Breaker Transformers TRADELINE INSTALLATION INSTRUCTIONS APPLICATION These transformers provide power to 24 Vac circuits in heating cooling control systems Although the transformers are typically used in heating cooling control systems they can be used in any application that does not exceed the load ratings They include a button for manually resetting the circuit breaker They meet National Electrical Code Class 2 not wet and Class 3 wet requirements and are Underwriters Laboratories UL Inc listed under UL 1585 Transformers can be foot mounted or conduit panel mounted See Table 1 for additional specifications Table 1 Model Specifications Voltage Output Rating Model Number Input Voltage Wiring Open At Rated Powe Wiring at 100 Percent 60 Hz Connections Connections Power Factor AT150F 9 in leadwires 27 0 24 0 9 in leadwires 50 VA Leds ae ei A AT175F 9 in leadwires 27 0 24 0 9 in leadwires 75 VA er ee S e e 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 VSE BERENS OR 3 Installer must be a trained experienced service SLOTS 4 IN technician MOUNTING FEET 4 After installation is complete check out
3. NDUIT CONNECTOR LOCK NUT Fig 2 Conduit panel mounting plate not included Wiring 1 All wiring must comply with local codes and ordi nances Disconnect power before making wiring connections to prevent electrical shock or equipment damage 2 Make the primary connections to the line voltage power supply Be sure to use the correct leadwires for the available power supply See Fig 3 3 Insulate the ends of the unused leadwires using wire nuts or capping with a solderless connector 4 Make the secondary connections to the 24 Vac control circuit M6906 120 208 240 VAC MODELS _ COMMON A PRIMARY SECONDARY ORANGE 208 277 480 VAC MODELS _ COMMON A PRIMARY SECONDARY BLACK RED A SECONDARY LEADWIRES ARE BLUE AND YELLOW LEADWIRES BLACK IS COMMON WITH RESPECT TO THE TRANSFORMER WINDING ONLY AND NOT THE EXTERNAL CIRCUIT M6907 Fig 3 Transformer schematics CHECKOUT Voltage Check After the installation is complete turn on the power supply and perform a voltage check 1 2 3 Place the controlled equipment in operation and observe through one complete cycle Using a voltmeter verify the proper primary and secondary voltages If the voltage readings are incorrect make sure the primary voltage connections are made properly 4 Measure the voltage again a If the proper primary voltage is measured and the secondary voltage is significantly less than the voltage shown
4. in Table 1 the transformer winding is damaged Replace the transformer and repeat the checkout procedures b If the primary voltage is OV make sure the power supply is connected properly or repair if necessary Repeat the checkout procedures 5 Do not put the system into operation unless the correct primary and secondary voltages are measured Circuit Breaker Overloading the transformer results in tripping the circuit breaker If the secondary side of the transformer is short circuited the circuit breaker trips in less than one minute Reset the circuit breaker by pressing the reset button on the side of the transformer It can take up to one hour for the transformer to cool allowing it to reset If the circuit breaker continues to trip thoroughly check the system for short circuits and the current draw Honeywell Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc Honeywell Limited Honeywell Limit e Honeywell Plaza 155 Gordon Baker Road P O Box 524 North York Ontario Minneapolis MN 55408 0524 M2H 2C9 69 1014 1 C H Rev 9 96 Printed in China
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