System Protection: Acts as a primary safety check to prevent compressor damage from excessive heat

Dual-Purpose Control: Simplified heating and cooling management with a single dial

Common signs include the motor failing to start despite receiving proper line voltage and 24V control signals

Tamper-Resistant Design: The blank faceplate without setpoint windows or adjustment access helps maintain system calibration by preventing unauthorized changes

Mueller Industries AH15502 Valve R-134A System Protection: Acts as aThe Mueller Industries AH15502 is a professional grade refrigerant pressure relief valve engineered for critical overpressure protection in commercial HVACR systems. Specifically designed as a direct replacement for 5231 400, this atmospheric relief valve features a 400 PSI set pressure. The construction utilizes high tensile brass for corrosion resistance and reliable seating under high pressure conditions. With a 3 8 NPTFE inlet and a 3 8 flare