Outdoor Air-Cooled Condensing Unit Installation; Location Considerations; Piping Connections; Electrical Connections - Emerson VERTIV Liebert Mini-Mate2 Series User Manual

5.6

Outdoor Air-Cooled Condensing Unit Installation

NOTE
Follow all applicable national and local building, electrical and plumbing codes.
5.6.1

Location Considerations

To insure a satisfactory air supply, locate air-cooled propeller fan condensing units in an environment
providing clear 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
discharge locations.
The condensing unit should be located for maximum security and maintenance accessibility. Avoid
ground-level sites with public access. The recommended maximum refrigerant line length is 45 feet
(13.7m).
Install a solid base, capable of supporting the weight of the condensing unit. The base should be at
least 2 inches (51mm) higher than the surrounding grade and 2 inches (51mm) larger than the
dimensions of the condensing unit base. For snowy areas, a base of sufficient height to clear snow
accumulation must be installed.
Table 13 Unit dimensions
Model
PFH014A-_L
PFH020A-_L
5.6.2

Piping Connections

Details for Refrigerant (R-407C) Loop piping are in 5.4.2 - Piping Connections and Coolant
Requirements.
5.6.3

Electrical Connections

Refer to 5.4.4 - Electrical Connections, 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. A transformer is available for 277VAC,
single-phase, applications.
Low-Voltage Control Wire Connections
A field-supplied four-wire control connection is required between the outdoor condensing unit and the
evaporator. Refer to Figures 22, 24 and 25 and to the unit's electrical schematic.
Low-voltage wiring should be sized to allow a 1 volt maximum drop due to line resistance between the
evaporator and condensing unit. Use NEC Class 1 or 2 wiring according to wire routing conditions
chosen and local codes, sizing wire per maximum wire lengths using Table 14.
Table 14 Recommended minimum wire size
Max. Distance *
ft. (m)
50 (15)
100 (30)
150 (45)
* One-way control wire run between outdoor condensing unit and evaporator.
® ™
Liebert Mini-Mate2
Height (B)
Width (A) in. (mm)
40 (1016) 23.5 (597)
40 (1016) 23.5 (597)
Min. Wire Gauge
2
AWG (mm )
20 (0.75)
18 (1.0)
16 (1.5)
Depth (C)
in. (mm)
18 (457)
18 (457)
36
Site Preparation and Installation