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the 921103 maintains the original engineering specifications required for maximum SEER efficiency
maintaining ANSI Class IV leakage standards
the included conversion kit allows you to re-set the pressure regulator for 11
Increasing heater KW requires more than just a rack swap
Robust Hermetic Seal: The fully welded housing minimizes leak paths and protects internal components from contaminants
Lennox 33W18 Pressure Switch 320074-702 the 921103 maintains the originalThe Lennox 33W18 is a critical two stage combustion air pressure switch designed for specific Lennox high efficiency furnace models. This differential pressure switch ensures secondary heat exchanger safety by monitoring the inducer motor's draft performance. With a dual setpoint configuration of 0. 20" WC 1. 32" WC, this switch accurately sequences the low fire and high fire combustion cycles. Proper calibration of the Lennox 33W18 pressure switch is
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