Contractor Grade: Genuine OEM construction ensures nominal dimensions of 16" x 25" x 3" (Actual: 17

A veteran technician should inspect this gasket whenever the chamber face plate is pulled

The NEMA 4X enclosure provides superior protection against corrosion and environmental ingress in demanding mechanical rooms

Key Benefits Dual-Stage Modulation: Enhances energy efficiency and shortens warm-up times by switching between low and high heating outputs

preventing erratic system behavior or contact welding under standard inductive loads

Lochinvar & A.O. Smith 100233301 Switch R-407C Contractor Grade: Genuine OEM constructionThe Lochinvar & A. O. Smith 100233301 Switch is a critical fixed setting Normally Open (N. O.) air pressure switch designed for negative pressure sensing applications in high efficiency venting systems. Calibrated specifically to 1. 25" WC, this OEM component serves as a primary safety proving switch, ensuring the combustion blower is generating sufficient draft before the ignition sequence initiates. For veteran technicians, this 100233301 pressure