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Single Compressor
heat pump with gas/oil backup
Dual Compressor
heat pump with gas/oil backup
120
VAC
24 VAC
Reversing Valve
Compressor
Oil/Gas Heat
Fan
120
VAC
24 VAC
Reversing Valve
Compressor #1
Oil/Gas Heat
Fan
Compressor #2
Transformer
Optional
remote or
outdoor sensor
Transformer
Optional
remote or
outdoor sensor