The Schneider Electric (Erie) VM3221 Valve Body is a robust 3-way mixing assembly engineered for precision in hydronic HVAC systems

or differential pressure sensing without the need for additional bulky hardware

This switch is vital for technicians performing scheduled maintenance or emergency repairs on high-pressure 410A systems

Technicians should measure the DC microamp signal in series with the flame sensor

What causes these switches to fail

White-Rodgers 36C53-418 Gas Valve R-410A The Schneider Electric (Erie) VM3221The White Rodgers 36C53 418 is a professional grade, 24V standing pilot gas valve designed for versatility in residential and light commercial heating applications. This slow open gas valve provides a 3 4" x 3 4" NPT connection and a robust capacity of 335,000 BTU hr (Natural Gas at 1" PD), making it an ideal choice for high demand furnaces and boilers. The slow opening feature ensures a controlled ignition sequence, reducing burner noise and