it is factory set at 75 PSI to prevent catastrophic equipment failure caused by runaway firing conditions or thermal expansion

The heavy-gauge galvanized steel construction ensures durability against flue gas condensates

Professional-grade furnace diagnostics begin with reliable verification of the burner assembly

"chattering" under load

Environmental Protection: The NEMA 4X rated enclosure protects the internal solenoid from dust

Lochinvar & A.O. Smith 100110735 Pressure Switch 326070-701 it is factory set atThe Lochinvar & A. O. Smith 100110735 Pressure Switch is a critical safety component designed for high efficiency commercial water heaters and furnace draft inducer systems. This OEM replacement part (replaces 9005920215 and 192761) functions as a pressure blower switch, ensuring the combustion blower is generating sufficient negative pressure before allowing the ignition sequence to proceed. For technicians troubleshooting a 3 flash error code or a