Emerson MINI-MATE2 5.5.1Location Considerations, 5.5.2Electrical Connections, Power Connections

Site Preparation and Installation

5.5Indoor Air-Cooled Centrifugal Fan Condensing Unit Installation

NOTE

Follow all national and local building, electrical and plumbing codes.

5.5.1Location Considerations

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 5.4 - Installing the Ceiling Units.

5.5.2Electrical Connections

Refer to 5.4.4 - Electrical Connections for general wiring requirements and cautions. Refer to electrical schematic when making connections. Refer to unit serial tag for full load amp and wire size amp ratings.

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 14 and Figure 17) and the electrical schematic on the units for more details.) Four wires are required between the evaporator and condensing unit.

5.5.3Piping Connections

Details for refrigerant loop piping are in 5.4.3 - Piping Connections and Coolant Requirements.

5.5.4Ducting

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.

27 Liebert® Mini-Mate2™