First Company CB103B Circuit Board Freon Conversion requires a gas valve

Conversion requires a gas valve conversion spring to adjust the internal regulator for the higher pressure typical of propane

Always match the rotation to your fan motor data plate

15 inches of water column activation is mandatory to meet York OEM specifications and maintain safe combustion cycles

Inspect for a dirty air filter

and neon gases

First Company CB103B Circuit Board Freon Conversion requires a gas valveThe First Company CB103B Circuit Board (Model 1102 1A) is a critical OEM replacement control board designed for high performance management of HVAC air handler operations. As a direct fit replacement for the original 1102 1A and CB103B series, this board regulates essential system sequences, including fan motor control, heating relay activation, and cooling cycle timing. Engineered for First Co fan coil units and multi family residential air handlers,