Site Preparation and Installation
2.6Outdoor Air-Cooled Condensing Unit Installation
2.6.1Location Considerations
To insure a satisfactory air supply, locate air-cooled propeller fan condensing units in an environment providing clean air, away from loose dirt and foreign matter that may clog the coil. Condensing units must not be located in the vicinity of steam, hot air, or fume exhausts, or closer than 18 inches from a wall, obstruction, or adjacent unit. Avoid areas where heavy snow will accumulate at air inlet and dis- charge locations.
The condensing unit should be located for maximum security and maintenance accessibility. Avoid ground-level sites with public access.
Install a solid base, capable of supporting the weight of the condensing unit. The base should be at least 2 inches higher than the surrounding grade and 2 inches larger than the dimensions of the con- densing unit base. For snowy areas, a base of sufficient height to clear snow accumulation must be installed.
2.6.2Piping Connections
Details for refrigerant (R-22) loop piping are in Figure 12 - Piping connections - indoor air- cooled centrifugal fan condensing unit.
2.6.3Electrical Connections
Refer to 2.4.4 - Electrical Connections, Evaporator or Chilled-Water Unit for general wiring requirements and cautions. Refer to electrical schematic when making connections.
Power Connections
The outdoor condensing unit requires its own power source and earth ground, with a disconnect switch (field supplied) to isolate the unit for maintenance.
Control Connections
Field-supplied control wires must be connected between the evaporator and the condensing unit. (See Figure 6 and the electrical schematic on the units for more details.) Seven (7) wires are required between the evaporator and condensing unit. Eighth and ninth wires are required on systems with hot gas bypass.
