Lennox 87J71 Sequencer 318518-761 featuring a mechanical end stop

featuring a mechanical end stop that protects the internal O-ring while maintaining a permanent

valve must be used to ensure safe manifold pressure levels

Standard configuration uses Port M for main air

The P5 shorting bar must be positioned according to the cabinet size to maintain optimal filtration efficiency

the 63W40 prevents hazardous operation by interlocking the gas valve if flue obstructions or inducer failure are detected

Lennox 87J71 Sequencer 318518-761 featuring a mechanical end stopThe 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