Copyright Goodheart-Willcox Co., Inc. Chapter 32 Residential Split Air-Conditioning Systems 807 10 A cutout is made in the plenum and covered with a cover plate. The cover plate is slightly larger than the cut- out and is secured with sheet metal screws. The bottom of the coil assembly is secured and supported by blank-off plates and rails. Blank-off plates are sheet metal plates that support the evaporator coil and block off areas of the plenum so that all the air passing through the plenum is directed through the evaporator coil. Figure 32-17 shows a typical slant evaporator installation. In some cases, the metering device is supplied with the evaporator coil. If the metering device is not supplied with the coil, the proper size metering device must be selected and installed at the evaporator coil inlet. The condensate drain should be piped to an open drain. There should be an air break at the drain. Plastic drainpipe should be kept away from the warmer parts of the furnace. Some technicians install a 4″ U-trap in the drain line to stop airflow through the line. A conden- sate drain pan is built into the evaporator, as is the drain connection. Fan outlet needs 5' minimum clearance 5' 10" minimum clearance Refrigerant line connections 18" minimum clearance York International Corporation, Unitary Products Group Figure 32-15. A typical condensing unit installation showing the minimum acceptable clearances around such units. RectorSeal Figure 32-16. These access valve locks on an outdoor condensing unit restrict access to its suction and liquid lines. The color pink corresponds to the cylinder color used for R-410A.