Heil 1086579 Defrost Demand Sensor for Heat Pumps

The Heil 1086579 is an OEM defrost demand sensor designed for use with Heil, ICP, Tempstar, Arcoaire, Comfortmaker, and other Snyder General brand heat pumps. This critical component monitors the temperature of the outdoor coil to detect ice and frost buildup, triggering the defrost cycle when needed to maintain efficient heat pump operation during cold weather conditions.

Key Features:

• Genuine OEM Heil/ICP replacement part
• Mounts directly to outdoor coil tubing for accurate temperature sensing
• Works with defrost control board to initiate and terminate defrost cycles
• Closes when coil temperature drops below freezing to signal frost conditions
• Opens when coil reaches approximately 57°F to end defrost cycle
• Compatible with TCH series heat pump models including 018-260 tonnage ranges

This defrost sensor is an essential component that helps prevent outdoor coil freeze-up, ensuring your heat pump operates reliably and efficiently even in freezing conditions. When the sensor detects that the outdoor coil has reached freezing temperatures, it signals the defrost control board to reverse the refrigerant flow, melting accumulated ice and frost. A malfunctioning defrost sensor can lead to reduced heating performance, increased energy consumption, and potential system damage.

Important Note: This part has been superseded by Heil part number 1172766, which requires the defrost control board to be changed to part number 1087952 at the same time. Please verify compatibility with your specific heat pump model before ordering.