Heil Quaker ICP 1171900 Limit Switch

The Heil Quaker ICP 1171900 Limit Switch is a mission-critical safety component designed for International Comfort Products (ICP) heating systems, including Heil, Tempstar, and Comfortmaker units. As a veteran-grade OEM limit switch, the 1171900 is calibrated with a precise 165 degree cut-out and a 115 degree cut-in (165-50) temperature profile. This thermal disc switch is engineered to prevent heat exchanger damage by interrupting the burner circuit if static pressure issues or airflow restrictions cause internal temperatures to exceed safe operating parameters. Rated for 120/240V applications with an amperage capacity of 10/5A, this genuine replacement ensures exact electrical and physical compatibility with air handler models like the EHK05AKB series. When diagnosing furnace short cycling or blower motor lag, replacing a drifted or fouled limit switch with this factory-spec 1171900 part restores the integrity of the primary safety loop and prevents premature system fatigue.

• Exact OEM Calibration: Pre-set 165-50 temperature range eliminates the need for field adjustments and ensures reliable overheating protection.
• Broad ICP Compatibility: Direct-fit replacement for Heil, Tempstar, Arcoaire, and Snyder General air handlers and furnaces.
• Rugged Build Quality: Built to withstand the high-cycle demands of industrial-grade HVAC automation and manufacturing environments.
• System Reliability: Solves common issues like "blower runs constantly" or "furnace shuts down too soon" by providing accurate position sensing and thermal response.

What causes a limit switch like the 1171900 to trip repeatedly?
Frequent tripping is usually a symptom of restricted airflow. Check for a clogged air filter, blocked return air registers, or a failing blower motor that isn't moving enough CFM across the heat exchanger.

Can I use a higher temperature limit switch if this one keeps opening?
No. Never upsize a limit switch. The 165?F setting is determined by the manufacturer to protect the specific materials and design of your unit; using a higher limit can lead to a cracked heat exchanger or fire hazard.

Does this switch require a manual reset?
The 1171900 is an automatic reset switch. Once the internal temperature drops to the 115?F "cut-in" point, the circuit will close automatically to resume normal operation.

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.