What is the primary function of a normally closed (N/C) auxiliary switch

while the single try for ignition logic provides a safe operating sequence by locking out the system if a flame is not established within the designated 15-second window

The SEP91A-601R is built for the rigors of commercial HVACR environments

meeting UL 353 Limit Control standards for safety-critical monitoring

Lennox 99K70 Pump Cartridge Els PW 17895 What is the primary functionThe Lennox 99K70 Pump Cartridge is a critical OEM replacement part engineered for high performance fluid circulation in specific residential and commercial HVAC units. Designed to meet direct factory specifications, this cartridge ensures the hydraulic integrity of your circulator pump, preventing common mechanical failures that lead to system downtime. Whether you are performing a routine overhaul or responding to a total pump failure, the 99K70