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Test pressure switches
General 990-53
Fluke 117 - User's Manual
48 Hertz: 60 NEMA Frame: 3
White-Rodgers 47D40-801 Heat Pump Defrost Demand Control Board, Replacement for Rheem TUV-APCO-DER2 Test pressure switchesWhite Rodgers 47D40 801 Heat Pump Defrost Demand Control Board, Replacement for Rheem The 47D40 801 control is a microprocessor based demand defrost controller intended for Rheem heat pump systems. This controller uses basic differential temperature means to detect degradation of system performance due to ice build up on the outdoor coil. The controller uses self calibrating principles to calibrate to the heat pump system. The defrosting is performed
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