Use a multimeter to perform an ohm check at the back of the controller pins

Its flame-retardant plastic enclosure and robust internal circuitry make it a reliable choice for VAV system applications and specialized zone control

The extended capillary provides a vibration-dampening connection between the pressure tap and the control body

This kit includes the necessary Rotalock seal to establish a reliable

First Company CB103B Circuit Board Refrigerant Use a multimeter to performThe 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,