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Glycol/GLYCOOL-Cooled Models—Self-Contained Compressor
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5.0 GLYCOL/GLYCOOL-COOLED MODELS—SELF-CONTAINED COMPRESSOR
5.1 Drycooler Location
The drycooler should be located for maximum security and maintenance accessibility. Avoid ground-
level sites with public access or areas which contribute to heavy snow or ice accumulations. To assure
adequate air supply, it is recommended that drycoolers be located in a clean air area, away from loose
dirt and foreign matter that may clog the coil. In addition, drycoolers should not be located in the
vicinity of steam, hot air or fume exhausts. Also, drycoolers should not be located closer than 3 feet
(1 meter) from a wall, obstruction or adjacent unit.
5.2 Drycooler Installation
For roof installation, mount drycoolers on steel supports in accordance with local codes. To minimize
sound and vibration transmission, mount steel supports across load bearing walls. For ground instal-
lation, a concrete pad will provide adequate support. Drycooler legs have mounting holes for securing
the drycooler to steel supports or concrete pad.
5.3 Electrical Connections
Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to elec-
trical schematic when making connections. Make all wiring and electrical connections in accordance
with local and national codes.
5.3.1 Line Voltage
Line voltage electrical service is required for all drycoolers at the location of the drycooler. This power
supply does not have to be the same voltage as the indoor unit. This separate power source may be
208, 230, 460, or 575 V, 60 Hz; or 200, 230, or 380/415 V, 50 Hz. The disconnect switch is factory-sup-
plied and mounted in the electric panel.
5.3.2 Low Voltage
A control interlock between the drycooler and the indoor unit is required and is connected between 70
and 71 in the handy box of the indoor unit and the pump and drycooler control box of the drycooler.
NEC Class 1 wiring is required.
5.3.3 Pump and Drycooler
All wiring to the pump and drycooler from the control box should be done in accordance with the elec-
trical schematic on the inside lid of the drycooler control box and with local and national codes.
!
WARNING
Risk of electric shock. Can cause injury or death.
Potentially lethal voltages exist within this equipment during operation. Observe all cautions
and warnings on unit and in this manual.
The Liebert iCOM microprocessor does not isolate power from the unit, even in the “Unit Off”
mode. The only way to ensure that there is NO voltage inside the unit is to install and open a
remote disconnect switch. Refer to unit electrical schematic.
Use voltmeter to make sure power is turned off before making any electrical connections.