Description
The Carrier HH18HA122 is an OEM automatic (AUTO) high-limit switch engineered to protect furnaces and heating systems from dangerous overheating conditions. When supply-air or heat exchanger temperatures reach the 117–120°F trip threshold, the switch opens the control circuit and shuts down the burner, preventing equipment damage and potential safety hazards. Because it is an AUTO-reset type, the switch automatically restores the circuit once temperatures fall back to a safe operating level — eliminating the need for manual intervention after a nuisance trip.
Key Features
- OEM Carrier replacement part — direct fit for compatible Carrier furnace models
- AUTO (automatic) reset operation — restores circuit automatically after cooldown
- Trip temperature: 117–120°F for precise overheat protection
- Opens burner control circuit on high-temperature condition to prevent heat exchanger damage
- Reliable bimetal or disc-type sensing element for consistent, repeatable performance
- Drop-in replacement simplifies installation and reduces downtime
Application
The HH18HA122 is designed as a direct OEM replacement limit switch for Carrier furnaces and air handlers. It is a critical safety component that monitors heat exchanger or plenum temperatures and interrupts the heating cycle if temperatures exceed the rated setpoint. Always verify compatibility with the specific furnace model before installation.
Specifications
- Part Number: HH18HA122
- Brand: Carrier
- Switch Type: Automatic (AUTO) Reset Limit Switch
- Trip Temperature: 117–120°F
- Function: High-limit overheat protection
Reviews
There are no reviews yet.