The Carel pCOe expansion board is designed for use in Condaria VAR and advanced marine AC systems to extend the main board’s capabilities. It operates on 24VAC or 24VDC power. When installing, ensure the dip-switch settings match those on the original board; if unknown, refer to the wiring diagram for the serial address. The serial protocol dip-switches are rarely used. Indicator lights next to the switches show power (yellow) and data status—red or no lights indicate a problem. In some setups, this board only monitors connected components like pump current without controlling the AC unit. Compatible replacements include Dometic 336876, 290336876, and Condaria NGFE 5331000. New units are available, with occasional slightly used options. For expert advice, contact us. Search part # 20-2007.
