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the 700-426 is the direct functional replacement for the 700-473 model
providing stable control at low part-load conditions
The NBR (Nitrile) seals are specifically optimized for fuel gas service
this part number comes complete with the necessary replacement gasket for a full seal
Carrier HM56SERIES308 Ignition Control 319852-301 the 700-426 is the directThe Carrier HM56SERIES308 Direct Spark Ignition Control (DSI) is a critical integrated furnace control designed for precise HVAC combustion management. Functioning as a direct replacement for legacy Carrier and Bryant ignition modules, this DSI control board manages the induction motor, pressure switch monitoring, and electrode spark gap timing for reliable burner ignition. It features a sophisticated microprocessor that executes a pre purge cycle to