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The "U" designation typically refers to universal packaging
Broad Thermal Range: Precision calibrated for 180-210F temperature rating to protect the heat exchanger from overheating
this switch provides the exact technical specifications required for high-efficiency gas furnaces
preventing hazardous leaks at the valve assembly interface
It is compatible with air-to-air heat pumps only if they do not require a separate terminal for auxiliary or emergency heat (O/B terminal logic is not supported on this specific 1H/1C model)
MARS 43349 Pressure Switch The "U" designation typically refersWhen you're troubleshooting a system that keeps short cycling or tripping on low pressure, the MARS 43349 Pressure Switch is the reliable fixed setting solution you need in your truck. This SPST auto reset pressure switch is designed specifically for HVAC low pressure control, featuring a precise 35 PSI open (cut out) and a 60 PSI close (cut in) setpoint to protect compressors from vacuum damage and loss of charge. Built as part of the trusted Klixon