Description
Carrier HH19ZA190 Limit Switch — 190°F Open / 150°F Close
The Carrier HH19ZA190 is a high-temperature limit switch engineered to protect furnaces and heating systems from dangerous overheating conditions. Designed as a direct OEM replacement for compatible Carrier equipment, this limit switch provides dependable automatic safety shutoff when system temperatures exceed safe operating thresholds.
How It Works
The limit switch continuously monitors the heat exchanger or plenum temperature. When the temperature rises to the open setpoint, the switch interrupts the burner circuit, preventing further heat buildup. Once the system cools to the close setpoint, the switch resets and restores normal operation — providing automatic, hands-free protection.
Key Specifications
- Open Temperature: 190°F
- Close Temperature: 150°F
- OEM Part Number: HH19ZA190
- Brand: Carrier
- Application: Furnace overheat protection / high-limit safety control
Features & Benefits
- Direct OEM replacement for compatible Carrier furnaces
- Automatic reset operation — opens on high temp, closes on cooldown
- Protects heat exchanger and system components from thermal damage
- Helps maintain safe, code-compliant furnace operation
- Reliable bimetal or disc-type sensing for accurate temperature response
Application
The HH19ZA190 is intended for use in Carrier gas furnaces and air handlers requiring a high-limit safety switch. Always verify compatibility with your specific equipment model before installation. Consult the equipment service manual for proper mounting location and wiring instructions.
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