the flow path is open when the coil is de-energized and closes immediately upon receiving 120V power

the "H" suffix often denotes high-performance packaging or internal manufacturer coding

By regulating flow to the burner based on signal inputs from the main control board

For optimal proportional control

OEM Compatibility: Replaces legacy part numbers and integrates seamlessly with York

Grundfos 00519852 Isolation Valve Set 322027-701 the flow path is openThe Grundfos 00519852 Isolation Valve Set is a critical component for streamlining the installation and maintenance of Grundfos UP series circulator pumps. Engineered with a 3 4 inch Bronze Union connection, this valve set provides a reliable, leak free interface for residential and light commercial hydronic systems. The bronze construction ensures superior corrosion resistance, making it an essential choice for open loop potable water systems or