user manual
3-Way GLYCOOL Valve
The GLYCOOL coil shall be equipped with a fully
proportional 3-way control valve. This motorized con-
trol valve shall control the amount of flow to the
GLYCOOL coil and maintain constant temperature
and relative humidity.
Glycol Condenser
The glycol system shall be equipped with a coaxial
condenser having a total pressure drop of _____ feet
of water (kPa) and a flow rate of _____ GPM (l/s),
with _____ °F (°C) entering 40% ethylene glycol tem-
perature.
3-Way Water Regulating Valve
The condenser circuit shall be pre-piped with a head
pressure actuated 3-way water regulating valve.
Design Pressure
The GLYCOOL coil/condenser circuit shall be
designed for a pressure of [(150 PSI (1034 kPa)) (300
PSI (2069 kPa))].
Comparator Circuit
The system shall be equipped with a microprocessor-
controlled comparator sensor that permits free-cool-
ing operation whenever entering glycol temperature
is below return-air temperature.
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).
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
aluminum 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 rugged
scroll compressor, pressure safety switches, exter-
nally equalized expansion valve, filter dryer, and a
refrigerant sight glass and moisture indicator.
Refrigerant Line Sets (Optional)
Pre-charged refrigerant line sets shall be provided by
Liebert in proper lengths for application. Line set
length shall be _____ feet (m).
The condenser coil shall be constructed of copper
tubes and aluminum fins. The condensing unit shall
be factory assembled, charged with refrigerant and
sealed.
Components shall include scroll compressor, high-
pressure switch, Lee-temp refrigerant receiver, head
pressure control valve, and liquid line solenoid valve.
The condensing unit shall be designed for 95°F
(35°C) ambient and be capable of operation to -20°F
(-29°C) ambient.
A hot gas bypass circuit shall be provided to reduce
compressor cycling and improve operation under low
load conditions.
The condenser fan shall be designed for
_____ CFM (CMH) at _____ inches (mm) external
static pressure.
(Optional) Disconnect
Factory installed non-fused disconnect switch allows
unit to be turned off for maintenance.
3-Ton Models
The condensing module shall be capable of being con-
nected to the evaporator section using pre-charged
refrigerant line sets. No brazing, dehydration, or
charging shall be required. The fan/motor assembly
shall be direct drive.
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