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

System Protection: Prevents condenser fan motor failure and compressor slugging by managing ice accumulation during heating mode

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

This nickel-bearing element is encased in a durable brass tube probe

eliminating the need for shaft modifications or field adjustments during installation

Lochinvar & A.O. Smith 100233301 Switch R-407C Key Benefits Dual-Stage Modulation: EnhancesThe 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