this HVAC sequencing relay features a single pole single throw normally open configuration

When you're spec'ing out a hydronic system

The unit incorporates a high-flow magnet head and a three-position gas cock (Off-Pilot-On) for standard safety sequencing

replacing just the Emerson 057349 solenoid coil is a standard procedure that restores full functionality to the solenoid valve assembly

This component is critical for powering low-voltage control circuits

Spirax-Sarco 55227 Main Valve R-410A this HVAC sequencing relay featuresThe Spirax Sarco 55227 is a 2 inch NPT 25 Series main valve designed for high performance steam pressure and temperature regulation. This pilot operated steam pressure reducing valve (PRV) features a durable cast iron body and stainless steel internals to resist corrosion and wire drawing in demanding industrial environments. As a self actuated unit, it utilizes downstream pressure feedback through an external sensing line to provide accurate, stable