Nordyne 624689R Interface Module 318973-401 The Johnson Controls T-4752-202 is

The Johnson Controls T-4752-202 is a professional-grade dual temperature pneumatic thermostat engineered for precise control of heating and cooling systems in commercial HVAC environments

Using a multimeter set to millivolts (mV)

providing stable modulation

Heavy-Duty Construction: High-grade copper and brass materials prevent corrosion and withstand frequent tool engagement

Nordyne 624689R Interface Module 318973-401 The Johnson Controls T-4752-202 isThe Nordyne 624689R Interface Module is a critical replacement component engineered for precise communication between the thermostat and the integrated furnace control board in specific Miller and Intertherm gas furnaces. This OEM interface board is designed to manage the ignition sequence and blower timing, ensuring the heating system operates within factory specifications. As a direct fit Nordyne replacement part, it addresses common diagnostic