Carrier HH19ZA156 Limit Switch L99H008 High-pressure applications require a control

High-pressure applications require a control with "open on rise" switch action

Engineered for performance in unit heaters

as well as the UBX

OEM Compatibility: Authentic factory replacement for Trane SWT2533 and IS20144-3331

it ensures the system shuts down immediately if flame rollout is detected

Carrier HH19ZA156 Limit Switch L99H008 High-pressure applications require a controlThe Carrier HH19ZA156 Limit Switch is a critical OEM safety component designed for precise thermal regulation within Carrier, Bryant, and Payne furnace assemblies. This normally closed disc style switch acts as a primary high limit safeguard, engineered to interrupt the electrical circuit and terminate the heating cycle when internal plenum temperatures reach the 155F open setpoint. Once the heat exchanger cools to the 105F close setpoint, the