Emerson Liebert Challenger ITR - Manual (Page 69)

Electrical Data
61
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 integral 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 con-
structed 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 three-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, enclosure, 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).
2.3 Direct Expansion Split Systems
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 veloc-
ity 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.
Centrifugal Fan Condensing Unit
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, Liebert 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 pres-
sure.
(Optional) Disconnect
Factory installed non-fused disconnect switch allows unit to be turned off for maintenance.
5-Ton Models
The fan/motor assembly shall be belt drive. Condensing unit must be hard piped with the evaporator.
Sweat adapters are shipped loose with all evaporators for use on the 5 ton condensing units.