user manual
The unit shall be supplied with a (2 way) (3 way) (4
way) (ducted) air discharge plenum. The plenum
shall be 18 in. (457mm) high, insulated and powder
painted the same color as the room unit.
The manual disconnect switch shall be mounted in
the high voltage section of the electrical panel. The
switch shall be accessible with the door closed.
The manual disconnect switch shall be mounted in
the high voltage section of the electrical panel. The
switch shall be accessible from the outside of the unit
with the door closed, and prevent access to the high
voltage electrical components until switched to the
“OFF” position.
The unit shall be supplied with remote temperature
and humidity sensors. The sensors shall be con-
nected to the unit by a 30 ft. (9m), 60 ft. (18m), 90 ft.
(27m), 120 ft. (36m), 150 ft. (45m) shielded cable.
The firestat shall immediately shut down the system
when high temperatures are detected. The firestat
shall be mounted in the electrical panel with the
sensing element in the return air.
The smoke detector senses the return air, shuts
down the unit upon detection, and sends visual and
audible alarm. Dry contacts are available for a
remote customer alarm. This smoke detector is not
intended to function as or replace any room smoke
detection system that may be required by local or
national codes.
The condensate pump shall have the capacity of ____
GPH (l/h) at ____ ft. (m) head @ ____ V - ____ Hz. It
shall be complete with (single) (dual) integral float
switch, pump, motor assembly, and reservoir.
Direct Expansion Coil
The evaporator coil shall have _____ sq.ft. (sq. m) face
area, _____ rows deep. It shall be configured as (A)
(V) frame and be constructed of copper tubes and alu-
minum fins and have a maximum face velocity of
_____ ft. per minute (m/s) at _____ CFM (CMH). The
coil shall be provided with a stainless steel drain pan.
Refrigeration System
The refrigeration system shall consist of a high effi-
ciency scroll compressor, hot gas bypass, pressure
safety switches, externally equalized expansion
valve, filter drier, refrigerant sight glass and mois-
ture indicator.
Pump Down Control
A liquid line solenoid valve shall be provided for
pump down control.
Crankcase Heater
A crankcase heater shall be provided for additional
system protection from refrigerant migration during
off cycles.
Propeller Fan Condenser (Standard)
The Liebert manufactured air cooled condenser shall
be the low profile, slow speed, direct-drive, propeller-
fan type. The condenser shall be constructed of alumi-
num and contain a copper tube, aluminum fin coil
with an integral electric control panel. The system
shall be designed for _____ °F (°C) ambient. The air
cooled condenser shall have a _____ Volt, _____ phase,
____ Hz power supply.
Fan Speed Control (FSC) Head Pressure Con-
trol (Standard)
The winter control system for the air cooled con-
denser shall be Liebert Fan Speed Control (FSC).
The variable speed motor shall turn on at 10% of the
supply voltage and modulate in response to head
pressure to a full speed of 1050 RPM. It shall be
designed with ball bearings, permanent lubrication,
and internal overload protection.
The control system shall be complete with transduc-
ers, thermostats and electrical control circuit, factory
prewired and tested in an integral control panel. The
transducer shall automatically sense the head pres-
sure of the compressor and control the variable speed
fan on the air cooled condenser to properly maintain
the head pressure.
The fan speed control system shall provide positive
start-up and operation in ambient temperature as
low as -20°F (-29°C). Included with the fan speed
control system shall be a solid state winter start kit
as an integral feature of the electronic control panel.
Lee-Temp Head Pressure Control (Optional)
The winter control system for the air cooled con-
denser shall be “Lee-Temp.” The Lee-Temp system
shall allow startup and positive head pressure con-
trol with ambient temperatures as low as -30°F
(-34.4°C). The Lee-Temp package shall include: insu-
lated receiver, pressure relief valve for each circuit,
head pressure three-way control valve, and rotalock
valve for isolating the refrigerant charge. The Lee-
Temp receiver shall be factory insulated and
mounted ready for the field connection to the air
cooled condenser. The Lee-Temp heater shall be (150)
(300) _____ Watt and require a separate power sup-
ply of (115) (230) _____ Volt, single phase, _____ Hz.
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