leading to "arching" where the spark jumps to the chassis instead of reaching the electrode

Larger globe valves often encounter high differential pressures that exceed the torque rating of a single actuator

preventing hunting and ensuring the thermal expansion valve maintains the exact mass flow required by the evaporator

Using a genuine HVAC thermal fuse ensures the system stays within manufacturer specifications for safety and performance

making it compatible with standard HVAC control circuits

Lochinvar & A.O. Smith 100108421 Lower Thermostat 30067439-890 leading to "arching" where theFor professional contractors servicing Lochinvar or A. O. Smith residential electric units, the 100108421 Lower Thermostat is the critical OEM replacement part required to maintain precise thermal regulation. This WH9 lower thermostat is the officially authorized update for the legacy 9000507005 and 9000507015 models. Engineered with a patented bimetal sensor, this component ensures maximum temperature sensitivity and responsiveness to tank