Key Benefits Factory Precision: Genuine Reznor J915HHA ensures exact mechanical alignment and thermal response times required by the control board

Common Questions Which boiler models are compatible with the 550001939 kit

fixed-setting high pressure cut-out switch engineered for maximum system protection in refrigeration and R410A HVAC applications

the 5500-135M includes a shaft adapter kit and a heavy-duty break-off shaft designed to accommodate original dials or the included white dial overlay

Resideo L8124G1020 Relay 318518-761 Key Benefits Factory Precision: GenuineThe Resideo L8124G1020 Relay is a specialized Triple Aquastat Relay designed for forced hydronic heating systems that require high limit protection, low limit control, and circulator management. This immersion type controller features SPST high and low limit switching to maintain boiler water temperature and ensure efficient domestic hot water service. For multi zone applications, this unit allows for independent control by using an R845 Relay for