Carrier HH18HA094 Switch

The Carrier HH18HA094 Temperature Switch is a critical safety and operational component designed for precise thermal monitoring in residential and commercial HVAC units. This OEM Carrier replacement part is engineered to function as a limit or pipe mount switch, specifically calibrated to Open at 80°C and Close at 27°C. Such specifications make it an ideal fit for managing liquid line temperatures or discharge air in high-demand heating and cooling cycles. The integrated 95-inch lead wire provides significant flexibility for routing through complex furnace cabinets or rooftop units, ensuring a secure connection to the control board without the need for additional splicing.

As a veteran tech, you know that maintaining the correct thermal stack or refrigerant line temperature is non-negotiable for system longevity. The HH18HA094 features durable construction to withstand the vibration and thermal cycling common in 3/8-inch pipe applications. Whether you are troubleshooting a Carrier furnace limit switch error or performing a preventative upgrade, this temperature-actuated switch ensures the system stays within safe operating parameters, preventing compressor overheating or heat exchanger damage.

• Factory Calibrated Precision: Fixed 80/27 temperature setpoints ensure consistent cut-out and reset cycles without manual adjustment.
• Extended 95-Inch Leads: Simplifies HVAC part installation by allowing direct runs to the induction or blower control section.
• Versatile Application: Optimized for 3/8-inch tubing and pipe-mount configurations across multiple Carrier and Bryant models.
• High-Performance Safety: Acts as a reliable thermal limit to protect sensitive system components from reaching critical heat levels.

What is the primary function of the HH18HA094 in a system?
This switch functions as a temperature-actuated control that breaks the circuit when the temperature reaches 80°C (176°F) to prevent overheating, automatically resetting when the temperature drops to 27°C (80.6°F).

Will this switch work on 1/2-inch piping?
This specific model is designed with a curvature and clip system optimized for 3/8-inch diameter tubes. For larger piping, a different mounting bracket or part number may be required for proper thermal contact.

Can I use this as a replacement for a manual reset limit switch?
No, the HH18HA094 is an automatic reset limit switch. It should only be used in applications where the original engineering specifications call for an automatic reset at the 27°C threshold.

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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.