Lennox 87J71 Sequencer 324846-701 The 37K63 is the base

The 37K63 is the base part number used in technical manuals

Integrated Air Venting: The internal thermostatic bellows eliminate air binding and improve system startup times

ensure the probe is fully immersed in the top six inches of the tank where the water is hottest

critical for maintaining system static pressure and motor efficiency

this valve ensures linear heat output across a wide range of actuator positions

Lennox 87J71 Sequencer 324846-701 The 37K63 is the baseThe Lennox 87J71 Heat Sequencer is a critical OEM replacement component designed to manage the staging of electric heating elements in residential and light commercial air handlers. This upper heat sequencer functions as a thermal relay, utilizing a 24V solid state PTC heater to actuate a bimetal disc. By providing precise time delay intervals, it prevents massive inrush currents that could otherwise trip circuit breakers or damage the electrical