Installation manual

Air Cooled Models
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3.0 AIR COOLED MODELS
3.1 Condenser Location
3.1.1 Outdoor Prop Fan Models
The air cooled condenser should be located for maximum security and maintenance accessibility.
Avoid ground level sites with public access or areas that contribute to heavy snow or ice accumula-
tions. Utilize centrifugal condensers whenever interior building locations must be used. To assure
adequate air supply, Liebert recommends that condensers be located in a clean air area, away from
loose dirt and foreign matter that may clog the coil. Condensers should not be located in the vicinity of
steam, hot air or fume exhausts. Also, condensers should be located no closer than 3 feet (1 meter)
from a wall, obstruction or adjacent unit.
Install condensers in a level position to assure proper refrigerant flow and oil return. For roof instal-
lation, mount condensers on steel supports in accordance with local codes. To minimize sound and
vibration transmission, mount steel supports across load bearing walls.
For ground installation, a concrete pad will provide adequate support. Condenser legs have mounting
holes for securing the condenser to steel supports or concrete pad.
3.1.2 Indoor Piggyback Models
The piggyback condenser can be located directly behind the Deluxe unit or in a separate remote
indoor location. It may be placed directly against an outside wall, with the proper openings cut in the
wall for entering and leaving air. If it cannot be located near a wall, the unit may be ducted to the out-
side. Proper grilles/screens are required on the outside wall.
3.2 Electrical Connections
3.2.1 High Voltage
High voltage electrical service is required for all air cooled condensers at the location of the con-
denser. 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 575V, 60Hz; or 200/230 or 380/415V, 50Hz. The disconnect
switch may be factory supplied and mounted in the electrical panel or field supplied and mounted per
local and national codes.
3.2.2 Low Voltage
A control interlock between the condenser and the indoor unit is required and is connected between
70 and 71 on the wire raceway in the compressor compartment of the indoor unit and the electric
panel of the air cooled condenser.
3.2.3 Lee-Temp/Flood Back Head Pressure Control Condensers (Standard on Piggyback
Models)
Lee-Temp condensers require a separate power supply for the heated receivers. This power supply is
connected to the electrical connection box on the end of the receiver.
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