When diagnosing LP boiler firing issues

This sweat-type expansion valve is typically supplied with the integrated power element and capillary tube

and 480V loads

Large Viewing Port: Provides a wide-angle view for immediate detection of bubbles or flash gas in the liquid line

Carrier HH18HC350 Rollout Switch 322057-301 When diagnosing LP boiler firingThe Carrier HH18HC350 Rollout Switch is a critical safety component designed for high temperature monitoring in select Carrier, Bryant, and Payne gas fired furnaces and packaged RTU systems. This OEM flame rollout switch features a 350 degrees F fixed setpoint and a Single Pole Double Throw (SPDT) configuration. In the event of a "rollout" where flames escape the combustion chamber, the thermal sensitive coil triggers the manual reset rollout switch