Lennox 27W13 Pressure Switch

The Lennox 27W13 High Pressure Switch (OEM Part #100087-08) is a critical safety component engineered for precise refrigerant pressure monitoring in high-performance HVAC systems. This SPST normally closed (N.C.) switch is designed to protect the compressor and refrigeration circuit by interrupting operation when head pressure reaches 550 PSIG. To maintain system uptime without manual intervention, it features an auto-reset function that re-engages the circuit once pressure drops to 425 PSIG. Built for durability in demanding environments, this switch utilizes gold flash contacts for superior conductivity and resistance to oxidation in low-voltage 24VAC circuits.

This genuine Lennox OEM replacement ensures seamless integration with residential and light commercial equipment, including R-410A heat pumps and air conditioners. It comes equipped with 45-inch leads and a 1/4" SAE female flare connection for a secure, leak-proof fit on standard service ports or discharge lines. By strictly adhering to factory specifications, the 27W13 prevents catastrophic equipment failure and ensures the system operates within safe mechanical limits, making it a staple for any technician's truck stock.

Key Benefits

• Optimized System Safety: Prevents compressor damage by 550 PSI cut-out actuation.
• Automated Recovery: Integrated 425 PSI auto-reset eliminates unnecessary service calls for temporary pressure spikes.
• Superior Electrical Reliability: Gold flash contacts ensure stable 2-Amp switching at 18/30 VAC.
• Universal Compatibility: Standard 1/4" SAE female flare fitting matches most Lennox liquid line service ports.
• Extended Reach: 45" factory-installed leads provide ample length for flexible routing to the control board.

Common Questions

What is the difference between the 27W12 and 27W13?
The 27W12 is typically calibrated for R-22 systems with lower trip points, whereas the 27W13 is specifically engineered for the higher operating pressures of HFC-410A systems.

Can this switch be used in a 240V circuit?
No. This switch is rated for 18/30 VAC at 2 Amps and is intended for use within the unit's low-voltage safety string. Using it in high-voltage applications will cause immediate component failure.

Does this require a manual reset button?
No, this is an automatic reset pressure switch. It will close the circuit automatically once the system pressure equalizes below the 425 PSIG reset threshold.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.