Replacing the Transformers

These components drop the line voltage to low voltage components such as control board, AIF board and contactor coils. Each control transformer is equipped with an integral reset switch.

To avoid electrical shock or property damage, move the power switch to OFF and disconnect power.

Checkout:

1. Support control panel bottom with one hand, loosen retaining screw at top, slide panel down slightly to clear screw, push panel back up, then swing panel top out and down.

2. Press reset button on control transformer. If transformer does not reset, continue with procedure.

   SHOCK HAZARD To avoid electrical shock, perform relay checks or transformer checks as described as instructions.

   The following checks are performed with the wall circuit breaker closed and the main power switch in the ON position. Extreme caution should be taken. Make connections before applying power, take reading, and remove power before removing meter leads, or electrical shock could result.

3. Pull appropriate connector, either from the AIF PC board or from the control PC board.

4. With power on, take a voltage reading on the appropriate pins. If transformer proves faulty, continue with replacement instructions.

Replacing

To avoid electrical shock or property damage, move the power switch to OFF and disconnect power.

1. Loosen the screw securing the top of the control panel and lower the control panel.

2. Label and remove wires from (AIF) transformer, or disconnect white connector on the control transformer.

3. Using a 5/16 inch socket, remove nuts securing transformer and remove transformer.

4. Replace transformer in reverse order.