the 705-502 is a millivolt operator

This cast iron water regulating valve is specifically engineered to maintain head pressure by modulating water flow through water-cooled condensers

The "C" suffix typically denotes packaging or specific distribution channels but does not affect performance or compatibility

Occasional dripping occurs during normal pressure fluctuations

allowing for field flexibility across different fuel types

Dwyer Instruments 1910-20 Pressure Switch, 321142-301 the 705-502 is a millivoltDesigned for precision and field reliability, the Dwyer Instruments 1910 20 is a essential differential pressure switch for monitoring air and non combustible gases in HVAC systems. This Series 1900 pressure switch features a wide set point range of 4. 0" w. c. to 20. 0" w. c., making it ideal for high demand applications such as clogged filter detection, fan proving, and frost prevention on refrigeration coils. The unit utilizes a single pole double