Friedrich FSHW091 Service And Parts Manual page 41

9-24k Sequence of Operation
6. Electric Heating Function of Chassis
(1) When T ≤32ºF , the electric heating of chassis will operate;
outdoor amb.
(2) When T >35.6ºF , the electric heating of chassis will stop operation;
outdoor amb.
(3)When 32ºF <T
outdoor amb.
7. Electric Heating Function of Compressor
(1) When T ≤23ºF , compressor stops operation, while the electric heating of compressor starts operation;
outdoor amb.
(2) When T >28.4ºF , the electric heating of compressor stops operation;
outdoor amb.
(3) When 23ºF <T
outdoor amb.
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OPERATION
≤35.6ºF, the electric heating of chassis will keep original status.
≤28.4ºF , the electric heating of compressor will keep original status.