Carrier HH18HC350 Rollout Switch

The Carrier HH18HC350 Rollout Switch is a critical safety component designed for high-temperature monitoring in select Carrier, Bryant, and Payne gas-fired furnaces and packaged RTU systems. This OEM flame rollout switch features a 350 degrees F fixed setpoint and a Single Pole Double Throw (SPDT) configuration. In the event of a "rollout" where flames escape the combustion chamber, the thermal sensitive coil triggers the manual reset rollout switch to interrupt the burner circuit, preventing equipment damage and hazardous conditions.

As a universal HVAC rollout switch replacement for specific Carrier heating systems, this part ensures that the ignition sequence is immediately halted if cabinet temperatures exceed safe operating limits. The SPDT limit switch design offers versatile wiring compatibility for 24V control circuits, serving as a reliable line of defense for commercial and residential technicians performing preventive maintenance or emergency repairs. Its robust construction is engineered to meet HVAC safety switch standards for industrial-grade thermal protection.

• Precise Thermal Protection: Factory-calibrated to trip at exactly 350 degrees F, ensuring rapid response to flame rollout.
• Versatile SPDT Configuration: The Single Pole Double Throw mechanism facilitates easy integration into diverse HVAC control circuits.
• OEM Compatibility: A direct factory-authorized replacement for original Carrier HH18HC350 parts to maintain system UL/CSA listings.
• Enhanced Equipment Safety: Designed to prevent catastrophic heat damage to furnace components and surrounding structures.

• Can I bypass the rollout switch for testing? No. As an HVACR technician, you know that bypassing a safety limit is a major code violation and a fire hazard. Always diagnose the cause of the rollout before replacing the part.
• What causes this switch to trip? Common causes include cracked heat exchangers, obstructed flue passages, or insufficient combustion air. If the HH18HC350 keeps tripping, inspect the heat exchanger immediately.
• Is this a manual or automatic reset? This is a manual reset rollout switch, meaning once it trips due to high heat, a technician must physically reset it after the safety issue has been resolved.

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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.