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When performing a replacement heater element installation
To ensure maximum service life and prevent premature thermal protector trips
When the pre-heater or combustion air reaches the 155°F threshold
VFD Compatibility: Includes an internal AEGIS bearing protection ring to prevent EDM electrical discharge damage when used with inverters
This OEM replacement is engineered specifically for commercial air handling units and process cooling environments where consistent air velocity and thermal management are non-negotiable
Lennox 22W68 Limit Switch 322838-753 When performing a replacement heaterThe Lennox 22W68 Limit Switch is a critical safety component engineered to monitor internal plenum temperatures and prevent heat exchanger damage. This OEM Lennox replacement part is calibrated with an L165 40F temperature rating, meaning the circuit opens at 165F to interrupt the heating cycle and automatically resets once the temperature drops by 40F. Designed for high demand HVAC furnace repair and commercial rooftop units, this 165F high limit
US$ 498.50
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US$ 120.00