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Precision Thermal Safety: Protects the heat exchanger by cutting power to the gas valve or heating elements when internal temperatures exceed 230°F
allowing the system to safely re-engage once temperatures drop to 130°F
the Johnson Controls ST-D24 should read exactly 10
This dual pressure switch features a normally open (N/O) contact configuration
Armstrong Furnace R39029B002 Control Board Els PW 17895 Precision Thermal Safety: Protects theThe Armstrong Furnace R39029B002 Control Board is a critical integrated furnace control (IFC) designed for reliable sequence management in high efficiency residential heating systems. Engineering for precise HVAC control board replacement, this module manages the inducer blower, igniter sequence, and main blower fan timing to ensure peak operational safety. It is a direct fit for many Armstrong Air furnace parts, providing seamless communication
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