Carrier HH18HC065 Defrost Thermostat

The Carrier HH18HC065 Defrost Thermostat is a critical temperature-actuated switch designed for Carrier, Bryant, and Payne heat pump systems. As a veteran-grade OEM replacement part, this DPDT defrost thermostat ensures precise defrost cycle management by monitoring the outdoor coil temperature. It is engineered to open at 65°F and close at 45°F, preventing unnecessary heater activation and protecting the compressor from liquid slugging during cold weather operations. This HVAC defrost sensor is a direct-fit component for various residential condensing units and heat pumps using Puron R-410A refrigerant. For contractors performing a heat pump defrost troubleshoot, this switch provides the reliable mechanical feedback required by the defrost control board to initiate and terminate the defrost sequence. Integrating this Carrier HH18HC065 into your service call restores system efficiency and prevents coil icing, ensuring the outdoor fan motor and reversing valve operate within factory parameters.

• OEM Precision: Genuine Carrier HH18HC065 ensures exact calibration for 65/45 degree temperature actuation.
• System Protection: Effectively manages the transition between heating and defrost modes to prevent outdoor coil ice buildup.
• Direct Compatibility: Designed specifically for Carrier, Bryant, and Payne heat pump models, including 25HBB and 25HCB series.
• Rugged Construction: Built to withstand extreme outdoor ambient conditions and frequent thermal cycling.

• When does the HH18HC065 open and close? This thermostat is designed to close the circuit when the coil temperature drops to 45°F and open (terminating defrost) once the coil reaches 65°F.
• Where is the defrost thermostat located? It should be securely attached to the 3/8-inch O.D. stub tube located on the liquid header of the outdoor coil.
• Will this work with R-410A systems? Yes, this component is fully compatible with modern Puron R-410A heat pump systems.

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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.