Replace Transformer/Fuse PSC Blower

Replace the Transformer or Transformer Fuse

Use an inline fuse or amp probe after installing the new transformer until the cause of the original transformer failure is located and corrected. …  To use the amp probe method:  (1) be prepared to cut or disconnect the 24 volt circuit quickly. (2)  set up to read the transformer secondary line amp draw. (3) Disconnect all load carrying control circuits and reconnect them one by one while watching the amp probe. (4) The problem is in the circuit of the control wire that pulls the excessive amperage. (5)   Quickly disconnect power if any amp reading exceeds the maximum amp rating of the transformer.  To determine the maximum amperage of a transformer; divide the transformer rated VA by the transformers secondary voltage (40va / 24v = 1.66amps).

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AC low voltage wiring diagram