1 location considerations, 2 piping connections, Water/glycol piping considerations – Liebert 50 & 60Hz User Manual
Page 35: Condensing unit fluid requirements, Regulating valve, 3 electrical connections, Control connections, Location considerations, Piping connections, Electrical connections
Site Preparation and Installation
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2.7
Indoor Water- and Glycol-Cooled Condensing Unit Installation
2.7.1 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 2.4 - Installing the Evaporator or Chilled-Water Units.
2.7.2 Piping Connections
Details for Refrigerant (R-22) Loop piping are in 2.4.3 - Piping Connections and Coolant
Water/Glycol Piping Considerations
Refer to Figure 20 for recommended field installed piping hardware such as shut-off valves and hose-
bibs. Water filters should be installed if water quality is poor. Filters will extend the service life and
efficiency of the condensers.
Condensing Unit Fluid Requirements
The maximum fluid pressure is 150 psi standard pressure or 350 psi for high pressure units (Refer to
unit serial tag and model number description page at beginning of this manual).
Regulating Valve
Water/Glycol-cooled units include a coolant flow regulating valve which is factory adjusted and should
not need field adjustment.
Standard water pressure and high water pressure valves are adjusted differently. Contact Liebert
Service before making any adjustments.
2.7.3 Electrical Connections
Refer to 2.4.4 - Electrical Connections, Evaporator or Chilled-Water Unit 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 six-wire control connection is required from the evaporator unit to the water/glycol condensing unit.
Two (2) additional wires are required when hot gas bypass is ordered. Glycol-cooled units also
require a two-wire control connection to the drycooler and pump package.
NOTE
HVAC grade ethylene or propylene glycol should be used on glycol systems.
Automotive antifreeze must not be used.