Carrier HH18HA166 Automatic Limit Switch, 160°F

Description

The Carrier HH18HA166 is an OEM automatic reset limit switch designed to protect furnaces and heating systems from dangerous overheating conditions. When supply air temperatures exceed the 160°F set point, this limit switch opens the circuit to shut down the burner, preventing heat exchanger damage and ensuring safe system operation. Once temperatures return to a safe level, the switch automatically resets — eliminating the need for manual intervention and reducing service calls.

Key Features

• 160°F automatic reset temperature set point
• Automatic reset operation — no manual reset required
• OEM Carrier replacement part for reliable, drop-in compatibility
• Protects heat exchangers and furnace components from thermal damage
• Designed for use in Carrier furnace and air handler applications

Application

The HH18HA166 limit switch is a direct OEM replacement for compatible Carrier furnace models. It is installed in the supply air plenum or heat exchanger area to monitor operating temperatures and interrupt the heating circuit if a high-temperature condition is detected. This helps extend equipment life, maintain system efficiency, and keep occupants safe.

Specifications

• Brand: Carrier
• Part Number: HH18HA166
• Switch Type: Automatic Reset Limit Switch
• Set Point Temperature: 160°F
• Application: Carrier Furnaces and Air Handlers