user manual
Piggyback Condenser (Optional)
The system shall be supplied with a piggyback con-
denser (PB). The condenser shall be constructed of
steel with frame coated using the autophoretic
®
pro-
cess, and panels powder coated to protect against
corrosion. The coil shall be copper tube with alumi-
num fins. 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 Liebert Lee-Temp head pressure con-
trol system shall be integral with the unit. The sys-
tem shall be designed for -30°F (-34.4°C) ambient.
The air cooled condenser shall have a _____ Volt,
3 phase, _____ Hz power supply.
Centrifugal Fan Condenser (Optional)
The system shall be supplied with a centrifugal fan
condenser (LCC). The condenser shall be constructed
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 Liebert Lee- Temp head pressure
control system shall be field piped to the unit. Elec-
trical controls shall be in a rain-tight enclosure.
The system shall be designed for _____ °F (°C) ambi-
ent. The air cooled condenser shall have a _____ Volt,
3 phase, _____ Hz power supply.
The water/glycol system shall be equipped with a coax-
ial condenser having a total pressure drop of _____ ft.
of water (kPa) and a flow rate of _____ GPM (l/s) with
_____ °F (°C) entering water/glycol temperature.
2-Way Water Regulating Valve with Bypass
(Standard)
The condenser circuit shall be pre-piped with a head-
pressure actuated 2-way regulating valve with
bypass.
3-Way Water Regulating Valve (Optional)
The condenser circuit shall be pre-piped with a head
pressure actuated 3-way regulating valve.
Design Pressure
The condenser water/glycol circuit shall be designed
for a pressure of [(150 PSI (1034 kPa)) (350 PSI
(2413 kPa))].
Crankcase Heater (Optional)
A crankcase heater is provided to prevent the migra-
tion of refrigerant to the compressor during off
cycles.
Hot Gas Reheat (Optional)
The complete hot gas reheat system shall include a
copper tube, aluminum fin coil, three-way solenoid
valve, and refrigerant check valve. The capacity of
the coil shall be _____ BTU/HR (kW).
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 inte-
gral 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 constructed of
galvanized steel with a copper tube, aluminum fin coil.
The heavy duty fan shall be the centrifugal type, dou-
ble 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
3-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.
Single Glycol Pump Package (Standard)
This system shall be provided with a centrifugal
pump mounted in a weatherproof and vented enclo-
sure. The pump shall be rated for _____ GPM (l/s) at
_____ ft. of head (kPa), and operate on _____ Volt,
3 phase, _____ Hz.
Dual Glycol Pump Package (Optional)
The dual pump package shall include pumps, enclo-
sure, and field mounted flow switch. The pumps
shall be wired to the drycooler control box which
includes a lead/lag switch for the pumps. The
standby pump shall automatically start upon failure
of the lead pump. Each pump shall be rated _____ for
GPM (l/s) at _____ feet of head (kPa).
GLYCOOL Coil
The GLYCOOL coil shall be constructed of copper
tubes and aluminum fins and be located upstream of
the evaporator coil. The GLYCOOL coil shall be
designed for closed-loop applications using properly
treated glycol solutions. The coil shall be rated at
_____ BTU/HR (kW) sensible cooling capacity with a
45°F (7.2°C) entering glycol solution temperature.
The GLYCOOL coil shall require _____ GPM (l/s) and
the total unit pressure drop shall not exceed _____
feet of water (kPa) when in the free cooling mode.
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