90 + metres per circuit plus elbows = high pressure drop. Is the liquid HP supply or pump circulation.
Your picture is not clear, but appears the liquid feed goes through/ into the drop leg on the accumulator. Something is not right, if level control activates and accumulator is frosting. Suggest there is a scavenge recirc orifice, and with high pressure loss in coil circuits the liquid is bypassing the evaporator.