Carrier HH18HC350 350°F SPDT Rollout Switch

Description

Carrier HH18HC350 Rollout Switch Overview

The Carrier HH18HC350 is a Single-Pole Double-Throw (SPDT) rollout switch engineered to protect gas furnaces from the hazards of flame rollout. Designed as a direct OEM replacement for compatible Carrier furnace models, this safety device monitors burner operation and interrupts system function when abnormal flame rollout is detected — helping prevent heat exchanger damage, carbon monoxide hazards, and potential fire risk.

Key Features

• OEM Carrier replacement rollout switch — SKU HH18HC350
• Trip temperature: 350°F (177°C) for precise, reliable safety cutoff
• SPDT (Single-Pole Double-Throw) switching action for versatile circuit control
• Mounts directly at the burner assembly to detect abnormal flame rollout conditions
• Helps protect heat exchangers, gas valves, and surrounding components from flame damage
• Manual reset design ensures a technician inspects the system before resuming operation
• Built for long service life in demanding residential and light commercial furnace applications

Application

This rollout switch is intended for use in Carrier gas furnaces as a direct OEM replacement part. When burner flames roll out beyond the combustion chamber — due to a blocked heat exchanger, restricted flue, or improper gas pressure — the HH18HC350 trips at 350°F, cutting power to the burner circuit and alerting technicians to a potentially dangerous condition. Always inspect and correct the root cause of rollout before resetting the switch.

Specifications

• Brand: Carrier
• Part Number: HH18HC350
• Switch Type: SPDT (Single-Pole Double-Throw)
• Trip Temperature: 350°F
• Component Type: Rollout Switch / Flame Rollout Safety Switch