This furnace pressure switch is constructed with durable housing and corrosion-resistant terminals to withstand the thermal cycling and moisture typical of condensing furnace environments

Key Benefits Universal Compatibility: Specifically designed for McDonnell & Miller Series 21

the 1C21-101 is an ideal low voltage room thermostat for commercial and residential applications where "cool only" operation is required

Standard 24V Logic: Compatible with all standard Trane and American Standard 24-volt control circuits and thermostats

Whether you are servicing a pressure reducing valve or a large-scale vacuum breaker

Reznor 50418 Limit Switch This furnace pressure switch isThe Reznor 50418 Limit Switch is a critical OEM safety component engineered for Reznor HVAC equipment, specifically compatible with models like the UA100. This 125 145F auto limit switch functions as a high limit safety cut off, monitoring internal heat exchanger temperatures to prevent hazardous overheating. When the temperature exceeds the factory calibrated 145F threshold, the switch opens the electrical circuit to the gas valve, immediately