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and the "A" model is for systems with vent dampers
Is specific hardware required for mounting
Direct OEM Upgrade: Engineered to replace obsolete 383-500-191 and 511-330-258 modules with modern U-Control technology
Common Questions What causes a Carrier HH12ZB160 to trip frequently
Carrier HH12ZZ165 Limit Switch 323080-701 and the "A" model isThe Carrier HH12ZZ165 Limit Switch is a critical OEM safety component engineered for precision thermal monitoring in HVAC furnaces and industrial heating systems. As a fixed temperature L165F 40 limit control, this switch features a normally closed (NC) circuit designed to open on a temperature rise at its 165F set point, effectively preventing heat exchanger damage. With a 40F differential, the automatic reset engages when the internal temperature
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