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33 Liebert
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Mini-Mate2
™
5.7 Indoor Water- and Glycol-Cooled Condensing Unit Installation
5.7.1 Location Considerations
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 in the ceiling, refer to 5.4 - Installing the Ceiling Units.
5.7.2 Electrical Connections
Refer to 5.4.4 - Electrical Connections for general wiring requirements and cautions. Refer to
electrical schematic when making connections. Refer to serial tag for full load amp and wire size amp
ratings.
Control Connections
A 4-wire control connection is required from the evaporator unit to the condensing unit. Glycol
cooled units also require a two-wire control connection to the drycooler and pump
package.
5.7.3 Piping Connections
Details for refrigerant loop piping are in 5.4.3 - Piping Connections and Coolant Requirements.
Water/Glycol Piping Considerations
Manual service shut-off valves must be installed at the supply and return line to each unit. This
enables routine service and/or emergency isolation of the unit. When the condensing unit fluid quality
is poor, filters that can be easily serviced should be placed in the supply line. These filters extend the
service life of the condensing unit.
Condensing Unit Fluid Requirements
The maximum fluid pressure is 150 PSI standard pressure and 350 PSI for high pressure units (Refer
to unit serial tag and model number description page at beginning of this manual).
Automotive antifreeze must not be used in glycol systems. Prepare glycol solution using
customary practices.
Regulating Valve
Water/Glycol cooled units include a coolant flow regulating valve that is factory-adjusted and should
not need field adjustment.
Standard pressure and high pressure valves are adjusted differently. Contact Emerson’s Precision
Cooling Support before making any adjustments.
NOTE
Follow all national and local building, electrical and plumbing codes.