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Technicians typically observe abnormal suction pressures
The Trane SWT1277 is an automatic reset furnace switch
It is designed for commercial and residential boiler repair where reliable microprocessor-based control is required to optimize combustion cycles
or four-position switching using the included stop pin and service labels
This model serves as the direct replacement for HF5-12-3-DPL and HKN-HF512-3DPL
Lennox 78W57 Pressure Switch Els PW 29614 Technicians typically observe abnormal suctionThe Lennox 78W57 Pressure Switch is a high precision, factory authorized OEM replacement engineered for draft proving and airflow safety monitoring in Lennox heating and cooling systems. Specifically calibrated to actuate at 0. 27" WC (Water Column), this SPST pressure switch features a 1 4" barb connection for secure integration into existing 24V control circuits. Designed as a direct replacement for Lennox part number 101572 04, it is a critical