Lennox 10U66 670# Manual Reset High Pressure Switch

Description

Lennox 10U66 — 670# Manual Reset High Pressure Switch

The Lennox 10U66 is a 670 PSI manual reset (M/R) high pressure switch engineered to protect refrigeration and HVAC systems from potentially damaging overpressure conditions. When system pressure exceeds the factory-set trip point, the switch opens the circuit and requires a manual reset before the system can resume operation — providing an added layer of safety and preventing repeated compressor cycling under fault conditions.

Key Features

• Factory-set 670 PSI cut-out pressure rating
• Manual reset (M/R) operation — requires deliberate technician intervention before restart
• Designed as a genuine Lennox OEM replacement component
• Protects compressors and refrigerant circuits from high-pressure damage
• Direct OEM replacement for compatible Lennox equipment

Application

The 10U66 is intended for use in Lennox residential and light commercial HVAC and refrigeration systems where high-side pressure protection is required. The manual reset design ensures that a qualified technician must diagnose and clear the fault condition before the system is allowed to restart, reducing the risk of equipment damage from recurring high-pressure faults.

Why Choose the Lennox 10U66?

• Genuine Lennox OEM part — ensures proper fit and reliable performance
• Manual reset provides enhanced system protection over automatic-reset switches
• Helps maintain system warranty compliance when replacing pressure safety controls
• Easy identification with clearly marked SKU 10U66 for accurate ordering