Catalogue

CG-PRC017H-EN 59
Mechanical Specifications
General
Units are constructed of galvanized steel frame with galvanized steel panels and access doors.
Component surfaces are finished with a powder-coated paint. Each unit ships with full operating
charges of refrigerant and oil.
Compressor and Motor
The unit is equipped with two or more hermetic, direct-drive, 3600 rpm 60 Hz (3000 rpm 50 Hz)
suction gas-cooled scroll compressors.The simple design has only three major moving parts and
a completely enclosed compression chamber which leads to increased efficiency. Overload
protection is included.The compressor includes: centrifugal oil pump, oil level sight glass and oil
charging valve. Each compressor will have compressor heaters installed and properly sized to
minimize the amount of liquid refrigerant present in the oil sump during off cycles.
Unit-Mounted Starter
The control panel is designed per UL 1995.The starter is an across-the-line configuration, factory-
mounted and fully pre-wired to the compressor motor and control panel. A factory-installed,
factory-wired 820 VA control power transformer provides all unit control power (120 Vac
secondary) andTrane CH530 module power (24 Vac secondary). Power line connection type is
standard with a terminal block.
Evaporator
Braze plate heat exchanger is made of stainless steel with copper as the braze material. It is
designed to withstand a refrigerant side working pressure of 430 psig (29.6 bars) and a waterside
working pressure of 150 psig (10.5 bars). Evaporator is tested at 1.1 times maximum allowable
refrigerant side working pressure and 1.5 times maximum allowable water side working pressure.
It has one water pass. Immersion heaters protect the evaporator to an ambient of -20°F (-29°C).
The evaporator is covered with factory-installed 0.75 inch (19.05 mm) Armaflex II or equal (k=0.28)
insulation. Foam insulation is used on the suction line. Water pipe extensions with insulation go
from the evaporator to the edge of the unit.
Condenser
Air-cooled condenser coils have aluminum fins mechanically bonded to internally-finned copper
tubing.The condenser coil has an integral subcooling circuit. The maximum allowable working
pressure of the condenser is 650 psig (44.8 bars). Condensers are factory proof and leak tested at
715 psig (49.3 bars).
Direct-drive vertical discharge condenser fans are balanced. Three-phase condenser fan motors
with permanently lubricated ball bearings and external thermal overload protection are provided.
Units start and operate from 0°F to 125°F (-18°C to 52°C) for wide ambient. Wide ambient allows
operation down to 0°F which is accomplished by a variable speed fan on each circuit that modulates
to maintain system differential pressure.
Refrigerant Circuit and Capacity Modulation
The 20-35 ton units have single refrigerant circuits.The 40-130 ton units have dual refrigerant
circuits. Each refrigerant circuit hasTrane scroll compressors piped in parallel with a passive oil
management system. A passive oil management system maintains proper oil levels within
compressors and has no moving parts. Each refrigerant circuit includes filter drier, electronic
expansion valve, and liquid line and discharge service valves.