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Propeller Fan Condensing Unit
The condenser coil shall be constructed of copper tubes and aluminum fins with a direct drive propel-
ler type fan and shall include a scroll compressor, high pressure switch, Liebert Lee-Temp receiver,
head pressure control valve, and liquid line solenoid valve. All components shall be factory assembled,
charged with refrigerant and sealed. No brazing, dehydration, or charging shall be required. Con-
densing unit shall be designed for 95°F (35°C) ambient and be capable of operation to -30°F (-34.4°C).
A hot gas bypass circuit shall be provided to reduce compressor cycling and improve operation under
low load conditions.
(Optional) Quiet-Line Models
The condensing unit shall be designed to operate at a sound level less then 58 dBa.
(Optional) High Ambient Models
The outdoor condensing unit shall be designed for design ambient operation of 105°F (40.6°C).
5-Ton Models
Condensing unit must be hard piped with the evaporator. Sweat adapters are shipped loose with all
evaporators for use on the 5 ton condensing units.
2.3.1 Water or Glycol-Cooled Split Systems
Water or Glycol-Cooled Condensing Unit
The water/glycol condensing unit shall be equipped with a coaxial condenser having a total system
pressure drop of _____ ft. of water (kPa) and a flow rate of _____ GPM (l/s) with _____ °F (°C) entering
water/glycol temperature.
Components shall include scroll compressor and high-pressure switch. The condensing unit shall be
factory charged with R-22 refrigerant.
The condenser circuit shall be pre-piped with a [(2-way) (three-way)] regulating valve which is head-
pressure actuated.
The condenser water/glycol circuit shall be designed for a static operating pressure of [(150 PSI
(1034 kPa)) (350 PSI (2413 kPa))].
A hot gas bypass circuit shall be provided to reduce compressor cycling and improve operation under
low load conditions.
A 70/30 Cu-Ni Econ-O-Coil must be specified whenever a GLYCOOL or Dual Cooling Source system is
applied to a cooling tower loop or other open water system.
(Optional) Disconnect
Factory installed non-fused disconnect switch allows unit to be turned off for maintenance.
5-Ton Models
Condensing unit must be hard piped with the evaporator. Sweat adapters are shipped loose with all
evaporators for use on the 5 ton condensing units.
Propeller Fan Drycooler (Standard)
The Liebert manufactured drycooler shall be the low profile, slow speed, direct drive propeller fan
type. The drycooler shall be constructed of aluminum and contain a copper tube aluminum fin coil
with an integral electric control panel. The drycooler shall be designed for _____ °F (°C) ambient.
Centrifugal Fan Drycooler (Optional)
The system shall be supplied with a centrifugal fan drycooler (LCD). The drycooler shall be con-
structed of galvanized steel with a copper tube, aluminum fin coil. The heavy duty fan shall be the
centrifugal type, double width, double inlet. The 1750 RPM (1450 RPM @ 50 Hz) fan motor shall be
mounted on an adjustable base, and equipped with an adjustable motor pulley. A three-way control
valve and thermostat shall maintain the desired fluid temperature. Electrical controls shall be in a
rain tight enclosure. The system shall be designed for _____ °F (°C) ambient. The drycooler shall have
a _____ Volt, 3 phase, _____ Hz power supply.