Why do you need crankcase heat on it? Are you operating the compressor at low ambient temperatures? Sounds like you are talking about crankcase heat for a central AC unit. If that's true, normally residential AC units are specced to only need it if it will be started at 55 degrees or lower. You could always put a thermostat on it to turn on the crankcase heat when it gets that cold. Although I'd personally be inclined to put a thermostat on it so it won't fire up below 60 degrees rather than heating the compressor.
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