Liebert RCM4S Panel 320819-301 If your furnace blower runs

If your furnace blower runs constantly while the burners remain off

Directly compatible with Johnson Controls pneumatic retrofits and legacy systems

Its robust construction and standardized 1/2-inch NPT specifications make it a preferred choice for technicians seeking to restore factory-standard performance to their heating and cooling units

This valve features sweat-on ODF connections

For contractors performing preventative maintenance or system repairs

Liebert RCM4S Panel 320819-301 If your furnace blower runsThe Liebert RCM4S is a professional grade remote contact monitor designed for high stakes environmental monitoring within data centers and industrial HVACR environments. Engineered as an OEM contact closure alarm panel, this unit provides critical oversight for up to four independent dry contact inputs, such as leak detection, UPS status, or precision cooling malfunctions. Operating on 24 VAC DC power, the RCM4S features a Form C common alarm relay