Trane CG-PRC007-EN - Manual (Page 48)

CG-PRC007-EN 48
Mechanical
Specifications (10–15 Ton)
General
Units shall be assembled on heavy
gauge steel mounting/lifting rails and
shall be weatherproofed. Units shall
include hermetic scroll compressors,
plate fin condenser coil, fan(s) and
motor(s), controls and complete factory
installed operating charge of oil and
R-22 refrigerant. Operating range shall
be between 115°F and 0°F. Units shall be
either UL or CSA certified and rated in
accordance with ARI Standard
550/590-98.
Casing
Unit casing shall be constructed of
18-gauge zinc coated heavy gauge,
galvanized steel. Exterior surfaces shall
be cleaned, phosphatized and finished
with a weather-resistant baked enamel
finish. Units surface shall be tested to
withstand a 500 consecutive hour salt
spray durability test. Units shall have
removable panels which allow access to
major components and controls.
Refrigeration System
Unit shall have two separate and
independent refrigeration circuits. Each
refrigeration circuit shall have integral
subcooling circuits. Refrigeration filter
driers and sight glasses shall be
provided as standard.
Compressors
Unit shall have two Trane direct-drive
hermetic scroll compressors with
centrifugal oil pump and provide
positive lubrication to all moving parts.
Motor shall be suction gas-cooled and
shall have a voltage utilization range of
plus or minus 10 percent of nameplate
voltage. Crankcase heater, internal
temperature and current-sensitive
motor overloads shall be included for
maximum protection. External high and
low pressure cutout devices shall be
provided.
Condenser Coil
Coils shall be 3/8” copper tubes
mechanically bonded to configured
aluminum plate fin as standard. Factory
pressure and leak tested to 420 psig
minimum air pressure and design
working pressure shall be 376 psig.
Metal grilles with PVC coating for coil
protection are optional.
Evaporator
The evaporator shall have independent
dual refrigerant circuits. The evaporator
shall be stainless steel braze plate
construction with a waterside working
pressure of 350 psig and a refrigerant-
side working pressure of 300 psig. One
water pass with a drain connection.
Condenser Fan and Motor(s)
Direct-drive, statically and dynamically
balanced propeller fan(s) with aluminum
blades and electro-coated steel hubs
shall be used in draw-thru vertical
discharge position. Either permanently
lubricated totally enclosed or open
construction motors shall be provided
and shall have built-in current and
thermal overload protection. Motor(s)
shall be ball bearing type.
Controls
The chiller shall be completely factory
wired with necessary controls and
contactor pressure lugs or terminal block
for power wiring. Control wiring shall be
24-volt control circuit which includes
fusing and control transformer. Time
delay timers to prevent compressors in
dual compressor units from
simultaneous start-up and anti-recycle
timers shall be standard.
Low Ambient Operation
Standard units shall start and operate to
approximately 50°F. Optional head
pressure control accessory permits
operation at lower temperature
extremes (see “General Data” section of
this catalog).
OPTlONS
Field Installed
Low Ambient Head Pressure Control
Shall modulate the rpm of unit outdoor
fan motor in response to unit head
pressure. Accessory provides unit
cooling operation to outdoor
temperatures of 0°F.
Vibration Isolation Packages
Shall reduce transmission of noise and
vibration to building structures,
equipment and adjacent spaces.
Packages shall be available in either
neoprene-in-shear or spring-flex types.
Condenser Coil Guard
Metal grille with PVC coating shall be
provided to alleviate coil damage.
Power Supply Monitor
Shall provide protection against phase
loss/reversal, phase imbalance, incorrect
phase sequence and low voltage.
Elapsed Time Meter/Number Starts
Counter
Shall record number of compressor
starts and operating hours of each
compressor.
Integrated Comfort Systems (ICS)
Interface
Shall provide the ability to communicate
with the Trane Tracer building
management system via TCM.
Flow Switch
Required as a safety interlock to prevent
operation of unit without evaporator
flow.
Gauges
Field-installed gauges monitor suction
and discharge pressures.
Factory Installed
Black Epoxy Coil
The black epoxy coating provides
excellent protection against aluminum
corrosion.
Hot Gas Bypass
Allows unit operation below the
minimum step of unloading.
Low Leaving Solution Temperature
Applications
Allows leaving solution temperatures as
low as 20°F. This capability is standard
from the factory on both 10 and 15-ton
models.