Split System Models
7.0SPLIT SYSTEM MODELS
Three (3) condensing unit styles are available: two (2) air cooled and one (1) water/glycol cooled con- densing unit.
7.1Location Considerations
7.1.1Air Cooled Condensing Units
To assure an adequate air supply, it is recommended that all condensing units be located in a clean air area, 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" from a wall, obstruction, or adjacent unit.
The outdoor condensing unit should be located for maximum security and maintenance accessibility. Avoid
A solid base, capable of supporting the weight of the condenser and at least 2" (51 mm) higher than the surrounding grade and at least 2" (51 mm) larger than the condensing unit base dimensions, should be installed at the
The centrifugal fan air cooled condensing unit may be located above the dropped ceiling or any remote indoor area. If noise is of concern, the condensing unit should be located away from personnel. Normal operating sound may be objectionable if the condensing unit is placed near quiet work areas.
To mount the unit in the ceiling, refer to 7.5.1 - Installing the Indoor Condensing Unit for hang- ing guidelines and to Figure 25 - Detail of ceiling hanging bracket for dimensional data.
7.1.2Water/Glycol Cooled Condensing Units
The condensing unit may be located above the dropped ceiling or any remote indoor area. If noise is of concern, the condensing unit should be located away from personnel. Normal operating sound may be objectionable if the condensing unit is placed near quiet work areas. To mount the unit the in ceiling, refer to 7.5.1 - Installing the Indoor Condensing Unit.
7.2Electrical Connections
Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to elec- trical schematic when making connections. Make all wiring and electrical connections in accordance with local and national codes.
! WARNING
Use voltmeter to make sure power is turned off before making any electrical connections.
7.2.1Line Voltage
Line voltage electrical service is required for all condensing units at the location of the condensing unit. This power supply does not have to be the same voltage as the indoor unit. This separate power source may be 208, 230, 460 or 575V, 60 Hz; or 200, 230, or 380/415V, 50 Hz. A disconnect switch is required and must be mounted per local and national codes to isolate the unit for maintenance.
7.2.2Low Voltage
The control cable between the condensing unit and the evaporator unit is connected between termi- nals 1,2 and 3 on the terminal strip in the evaporator unit and the condensing unit control box. A fourth wire is required on systems with hot gas bypass. NEC Class 1 wiring is required. Glycol cooled units also require a
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