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On the shutdown side
you would typically look for the NC/S versions or a 4-wire variant
Natural gas requires a larger orifice diameter to account for the difference in energy density and manifold pressure
How do I handle the capillary tube during installation
What power source is required for startup
Carrier HH12ZB280 Limit Switch THPU32HP7Y On the shutdown sideThe Carrier HH12ZB280 Limit Switch is a critical safety component designed for high temperature monitoring in Carrier, Bryant, and Payne gas furnaces and residential heating systems. This genuine OEM HVAC replacement part is engineered to open the electrical circuit when internal plenum temperatures exceed the factory defined safety threshold of 280F. It features a 40F differential, ensuring the system remains deactivated until temperatures drop to a
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