Marvair 20173A Defrost Control Board 328140-751 Built with a rugged NEMA

Built with a rugged NEMA 2 housing and a mechanical position indicator

When you're out on a rooftop servicing a Carrier commercial unit

this close-on-rise control can handle high electrical loads up to 16

Key Benefits Direct OEM Compatibility: Engineered to provide a precise match for part numbers HC39SL710

Key Benefits Imblue Technology: Advanced coating provides enhanced protection against atmospheric corrosion and the elements in outdoor applications

Marvair 20173A Defrost Control Board 328140-751 Built with a rugged NEMAThe Marvair 20173A Defrost Control Board is the essential HVAC replacement part designed specifically for Marvair heat pump systems requiring reliable defrost cycle management. As the direct replacement for the legacy 20173 board, this updated component integrates seamlessly into existing control panels to manage evaporator coil icing in low ambient conditions. For technicians performing heat pump troubleshooting, the 20173A provides precise timing