For contractors looking to improve fresh air ventilation without complex programming

0 ohms or an open line (OL) in the wrong state indicates a failure

The Nordyne 669772 TXV is a precision-engineered R410A thermal expansion valve designed to provide accurate refrigerant metering for Nordyne air handlers and heat pump systems

3100A15Q1952CL

using it with liquid propane would present a major safety hazard

Carrier HH18HA201 Limit Switch 320788-702 For contractors looking to improveThe Carrier HH18HA201 Limit Switch is a critical safety component designed for precise thermal monitoring within furnace heat exchangers and air handlers. Engineered as a 160 degree furnace limit switch, this L160 40 thermally actuated control prevents equipment overheating by breaking the electrical circuit when the internal temperature exceeds the 160F fixed setpoint. It features a 40F differential, ensuring the system resets once temperatures