Lennox 34M74 Pressure Switch Els PW 17895 Using it with NG would

Using it with NG would cause improper combustion and safety hazards

For 3/4" tappings

Repeated tripping typically indicates a low refrigerant charge

technicians can prevent premature bearing wear caused by improper housing clearance or excessive oscillation

For technicians troubleshooting furnace short cycling or units that trip on high limit

Lennox 34M74 Pressure Switch Els PW 17895 Using it with NG wouldThe Lennox 34M74 Pressure Switch is a critical safety component engineered for precision monitoring of combustion air in residential and commercial HVAC systems. This OEM Lennox replacement part features a single pole, single throw (SPST) electrical configuration, meticulously calibrated to an actuation point of . 33" WC (inches water column). Designed with a standard 1 4" barb connection, it ensures a secure, leak proof interface with the inducer