Common causes include a cracked heat exchanger

Key Benefits for Your HVAC System Optimized Airflow Distribution: Engineered to drive blower wheels at precise speeds for consistent industrial heating

the orifice provides the critical sealing surface for the seat disc

the 42J03 is mounted on the furnace plenum or the blower deck to monitor air temperatures directly coming off the heat exchanger

Field Adjustable: Features a trimmable sail and adjustable differential knob to match specific airflow parameters

Spence Engineering D320 Pilot Els PW 17895 Common causes include a crackedThe Spence Engineering D320 Pilot is a cast iron, spring actuated pressure reducing pilot designed for precise steam pressure regulation in industrial boiler systems. Engineered to work in tandem with a Spence Main Valve (such as the Type E or Type C), this pressure pilot valve handles a delivery range of 3 to 20 PSI, making it ideal for low pressure steam heating and process applications. The D Pilot 3 20# Spring Rg CI features a rugged construction