Heat Pump Coil Nomenclature 4T XC A 00 2 D S3 H CA A Refrigerant Type 4 - R410A Product Family T-Premium (Heat Pump or Convertible Coil) Coil Design X - Direct Expansion Evaporator Coil Product Family C - Cased A Coil A - Uncased A Coil F - Cased Horizontal Flat Coil Coil Width (Cased/Uncased) A - 14.5" / 13.3" B - 17.5" / 16.3" C - 21.0" / 19.8"