Description
Carrier HH18HA509 Automatic Reset Limit Switch
The Carrier HH18HA509 is a factory-quality automatic reset limit switch engineered to protect furnaces and heating systems from dangerous overtemperature conditions. Designed as a direct OEM replacement for compatible Carrier systems, this limit switch provides reliable, repeatable overheat protection to keep equipment operating safely and efficiently.
How It Works
The limit switch continuously monitors air temperature within the furnace heat exchanger or plenum area. When temperatures rise to the upper set point, the switch opens the circuit — shutting down the burner or blower to prevent damage. Once temperatures return to a safe level, the automatic reset function restores normal operation without requiring manual intervention, minimizing downtime and service calls.
Key Features
- Temperature range: 155°F to 195°F
- Automatic reset — no manual reset required after trip
- OEM-quality replacement for compatible Carrier furnace models
- Protects heat exchangers and system components from overheating damage
- Reliable open/close switching action for consistent safety performance
- Direct drop-in replacement for simplified installation
Application
The HH18HA509 is intended for use in Carrier residential and light commercial furnaces as a high-limit safety control. Always verify compatibility with your specific furnace model before installation. Consult the equipment service manual for proper wiring and mounting procedures.
Why Choose Jackson Systems
Jackson Systems stocks a wide selection of OEM and aftermarket HVAC controls, switches, and replacement parts. Order the Carrier HH18HA509 with confidence and get the right part delivered fast.
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