superseding multiple older part numbers including 35401254 and P771-7009

or if you notice a significant temperature drop across the device

the 18C series is specifically for hot water supply boilers and storage tanks

featuring three-prong 1/4" male push-on terminals for a clean

specifically engineered to maintain system integrity during pump-down cycles or defrost transitions

Trane SWT4155 Pressure Switch 321894-706 superseding multiple older part numbersAs a technician, you know that protecting the compressor from low side pressure drops is non negotiable for system longevity. The Trane SWT4155 Pressure Switch is a high precision low pressure cut out switch engineered to monitor refrigerant levels and prevent catastrophic compressor failure due to loss of charge or evaporator freeze ups. This genuine Trane OEM replacement part ensures the tight tolerances required for high efficiency commercial HVAC