Dwyer Instruments 1910-20 Pressure Switch, R-407A it requires a pilot air
Baker’s notes & crumb story
Description
Dwyer Instruments 1910 20 Pressure Switch, R 407A it requires a pilot air it requires a pilot air source (60 150 PSI) controlled by a 3 way solenoid valve to actuate the piston and open the flow path This condensate drain kit is used in over 300 furnaces