Description
Carrier HH18HA226 Rollout Switch Overview
The Carrier HH18HA226 is a Single-Pole Single-Throw (SPST) automatic reset rollout switch engineered to protect furnaces and heating equipment from the hazards of flame rollout. When burner flames extend beyond their normal combustion zone, this switch detects the resulting temperature spike and immediately interrupts the circuit to shut down the system — preventing heat exchanger damage, equipment failure, and potential fire hazards.
Key Specifications
- Brand: Carrier
- Part Number: HH18HA226
- Switch Type: SPST (Single-Pole Single-Throw)
- Open Temperature: 320°F
- Close (Reset) Temperature: 50°F
- Reset Type: Automatic Reset
- Application: Rollout / Flame Rollout Protection
How It Works
The HH18HA226 rollout switch is mounted near the burner assembly. Under normal operating conditions, the switch remains closed, allowing the furnace control circuit to function. If flame rollout occurs and temperatures at the switch location reach 320°F, the bimetal sensing element trips the switch to the open position, cutting power to the gas valve or ignition system. Once the root cause is addressed and the switch cools to approximately 50°F, it automatically resets — restoring circuit continuity without requiring manual intervention.
Features & Benefits
- Automatic reset design reduces service call frequency once the underlying issue is resolved
- 320°F trip point provides reliable detection of abnormal flame rollout conditions
- SPST configuration integrates seamlessly into standard furnace control circuits
- OEM Carrier replacement part ensures proper fit and performance
- Helps protect heat exchangers, burner assemblies, and surrounding components from thermal damage
- Essential safety component for maintaining code-compliant furnace operation
Application
The Carrier HH18HA226 rollout switch is a direct OEM replacement designed for use in Carrier furnaces and compatible heating systems. It is typically installed adjacent to the burner compartment where it can accurately sense abnormal flame activity. Always consult the equipment service manual to confirm compatibility and correct mounting location before installation.
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