Power Connections
The condensing unit requires its own power source and earth ground, with a disconnect switch to isolate
the unit for maintenance.
NOTE: Refer to serial tag for full load amp and wire size amp ratings
Control Connections
Field-supplied control wires must be connected between the evaporator and the condensing unit (See
Figure 7.7 on page38 and Figure 7.10 on page42) and the electrical schematic on the units for more
details.) Four wires are required between the evaporator and condensing unit.
7.5.3 Piping Connections
Details for refrigerant loop piping are in Piping Connections and Coolant Requirements on page30.
7.5.4 Ducting
Fan operation is designed for 3500 CFM (5947 CMH) at 0.5" (0.12kPa) external static pressure.
General Considerations
Use flexible ductwork or nonflammable cloth collars to attach ductwork to the unit and to control
vibration transmission to the building. Attach the ductwork to the unit using the flanges provided. Locate
the unit and ductwork so that the discharge air does not short circuit to the return air inlet.
Ductwork that runs through a conditioned space or is exposed to areas where condensation may occur
must be insulated. Ductwork should be suspended using flexible hangers. Ductwork should not be
fastened directly to the building structure.
For multiple unit installations, space the units so that the hot condensing unit exhaust air is not directed
toward the air inlet of an adjacent unit.
Considerations for Specific Applications
In applications where the ceiling plenum is used as the heat rejection domain, the discharge air must be
directed away from the condensing unit air inlet and a screen must be added to the end of the discharge
duct to protect service personnel. Locate the air discharge a minimum of 4 feet from an adjacent wall.
Failure to do so may result in reduced air flow and poor system performance.
If the condensing unit draws air from the outside of the building, rain hoods must be installed. Hood intake
dimensions should be the same as the condensing unit duct dimensions. In addition, install a triple layer
bird screen over rain hood openings to eliminate the possibility of insects, birds, water or debris entering
the unit. Avoid directing the hot exhaust air toward adjacent doors or windows.
Vertiv | Liebert Mini-Mate2—5 ton User Manual| 40
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