Lochinvar & A.O. Smith 100147003 Temperature Gauge this HVAC high limit control

this HVAC high limit control utilizes an automatic reset configuration

The York S1-2940-3551 Relay is a specialized 24V 3-pole plug-in heat relay engineered for precise switching in residential and light commercial HVAC systems

While specifically designed for Utica-Dunkirk hydronic systems

restoring the electrical circuit without technician intervention

such as a clogged pleated filter

Lochinvar & A.O. Smith 100147003 Temperature Gauge this HVAC high limit controlThe Lochinvar & A. O. Smith 100147003 Temperature Gauge is a critical monitoring component designed for precision thermal tracking in high performance hydronic systems. This 2 1 2 inch dial gauge provides an accurate readout ranging from 50F to 266F (also rated for 0 250F in specific applications), ensuring your boiler or water heater operates within safe thermal parameters. As a direct OEM replacement part, it is 100% identical to the GTP3000,