This TUB series expansion valve is optimized for R404A/R507A refrigerants

What causes these ignition modules to fail prematurely

Always verify the rotation of the existing blower wheel before finalizing the wiring to ensure air is pushed in the correct direction

Typical indicators include the valve failing to reach full close-off

Can this be mounted horizontally

Carrier HH19ZA190 Limit Switch 319847-401 This TUB series expansion valveThe Carrier HH19ZA190 Limit Switch is a critical safety component engineered for precise thermal monitoring in residential and commercial HVAC furnace systems. This temperature actuated switch is designed to protect equipment and ductwork from overheating by interrupting the electrical circuit when the high limit threshold is reached. Specifically calibrated with a 190F Open and 150F Close thermal profile, it serves as a reliable flame rollout switch