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

installing a fresh HVAC wireway is standard practice to ensure the system meets original factory safety configurations

This specific auto limit switch is the direct engineering successor to the legacy 5H74976-3

Key Benefits 150°F fixed setpoint provides reliable thermal protection against restricted airflow or blower failure

Mueller Industries AH15502 Valve R-134A Tamper-Resistant Design: The blank faceplateThe 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