This unit is the primary replacement for the Barber Colman MA-405-0-0-2

Rated for a maximum operating pressure of 98 PSI

As a veteran in transition projects

this DSI ignition control provides the robust timing and safety logic required by modern commercial and residential Carrier HVAC systems

Standard desiccant cores (like the RC-4864) should be used first for acid and moisture removal during system decontamination

Nordyne 632516R Pressure Switch 319825-402 This unit is the primaryThe Nordyne 632516R Pressure Switch is the direct engineering update for the legacy 632516 model, designed specifically for high efficiency gas furnaces within the Miller, Intertherm, and Nordyne families. This dual circuit 0. 50" PF 0. 40" PF differential switch monitors the pressure within the inducer housing and heat exchanger, ensuring the combustion process remains within safe operating parameters before allowing the ignition sequence to proceed.