The BRC1C51/1C61 uses a non-polarized 2-wire connection.
: Insert a flat-head screwdriver into the notched area at the bottom and twist "LIGHTLY" to remove the top casing from the lower part. Wiring Entry daikin brc1c51 61 installation manual
Cut the plastic at the notched area and remove any burrs to avoid damaging the wires. The BRC1C51/1C61 uses a non-polarized 2-wire connection