Description
The Carrier HH680352 is an OEM replacement limit switch engineered to protect your furnace or air handler from dangerous overheating conditions. When supply air temperatures reach the 190°F open setpoint, the switch interrupts the burner circuit, shutting down heat production and preventing heat exchanger damage. Once temperatures fall by the 20°F close differential, the switch automatically resets, restoring normal operation without manual intervention.
How It Works
A limit switch is a critical safety component in forced-air heating systems. It continuously monitors the temperature inside the furnace plenum or heat exchanger area. If airflow is restricted — due to a dirty filter, blocked return, or failed blower — temperatures rise rapidly. The HH680352 acts as the last line of defense, cutting power to the burner before damage occurs.
Key Specifications
- Brand: Carrier
- Part Number: HH680352
- Open (Trip) Temperature: 190°F
- Close Differential: 20°F (resets at approximately 170°F)
- Type: Automatic reset limit switch
- Application: OEM replacement for compatible Carrier furnaces and air handlers
Features & Benefits
- OEM Carrier part — ensures proper fit and reliable performance in compatible systems
- 190°F open setpoint provides precise overheat protection
- 20°F close differential allows stable, automatic reset without nuisance cycling
- Helps prevent heat exchanger cracking and costly furnace damage
- Direct replacement simplifies installation and reduces service time
Application
Designed as a direct OEM replacement for Carrier residential and light commercial furnaces. Always verify compatibility with the specific furnace model before installation. Consult the equipment service manual for proper mounting location and wiring procedures.
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