Nordyne 917178A Control Board Els PW 17895 5 to 4-ton cabinets

5 to 4-ton cabinets

making it the industry standard for powering gas valves

Proper installation requires verifying the vacuum hose connection and ensuring the venting system is clear of obstructions that could impact the pressure differential across the heat exchanger

this pan is designed to fit specific York and Johnson Controls evaporator coils

Nordyne 917178A Control Board Els PW 17895 5 to 4-ton cabinetsThe Nordyne 917178A Defrost Control Board is the official OEM replacement module designed to restore the automated defrost logic in residential split system heat pumps. This unit is a direct fit successor to the obsolete Nordyne 621579 and various older 1084 series boards, ensuring a seamless interface with existing 24V control circuits and sensor leads. As a veteran grade heat pump defrost control, it utilizes precise temperature monitoring at the