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Verify your boiler's rating plate and series number before installation to ensure exact fitment of the 510-811-466 assembly
with a compact 100mm x 80mm footprint designed for standard electrical enclosures
allowing the system to restore furnace ignition sequence once safe temperatures are reached
Common Questions: Can I use this coil on a 24VDC system
Marvair 20173A Defrost Control Board 326058-758 Verify your boiler's rating plateThe 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
