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RLC-PRC006-EN78
General
Units are leak and pressure tested at 437
psig high side, 250 psig low side, then
evacuated and charged. All Air-Cooled
Series R Chillers are factory tested prior
to shipment. Packaged units ship with a
full operating charge of oil and
refrigerant. Unit panels, structural
elements and control boxes are
constructed of 12-gauge galvanized steel
and mounted on a welded structural
steel base. Unit panels and control boxes
are finished with a baked on powder
paint, and the structural base with an air
dry paint. All paint meets the
requirement for outdoor equipment of
the U.S. Navy and other federal
government agencies.
Evaporator
The evaporator is a tube-in-shell heat
exchanger design with internally and
externally finned copper tubes roller
expanded into the tube sheet. The
evaporator is designed, tested and
stamped in accordance with ASME for a
refrigerant side working pressure of 200
psig. The evaporator is designed for a
water side working pressure of 150 psig.
Water connections are grooved pipe.
Each shell includes a vent, a drain and
fittings for temperature control sensors
and is insulated with 3/4-inch (140-250)
or 1 1/2-inch (275-500) Armaflex II or
equal insulation (K=0.26). Evaporator
heaters with thermostat are provided to
help protect the evaporator from
freezing at ambient temperatures down
to -20°F.
Condenser and Fans
Air-cooled condenser coils have
aluminum fins mechanically bonded to
internally finned seamless copper
tubing. The condenser coil has an
integral subcooling circuit. Condensers
are factory proof and leak tested at 506
psig. Direct-drive vertical discharge
condenser fans are dynamically
balanced. Three-phase condenser fan
motors with permanently lubricated ball
bearings and internal thermal overload
protection are provided. Standard units
will start and operate between 25 to
115°F/-4 to 46°C ambient.
Mechanical
Specifications
Compressor and Lube Oil System
The rotary screw compressor is semi-
hermetic, direct drive, 3600 rpm (60 Hz),
3000 rpm (50 Hz), with capacity control
slide valve, a load/unload valve, rolling
element bearings, differential refrigerant
pressure oil pump and oil heater. The
motor is a suction gas cooled,
hermetically sealed, two-pole squirrel
cage induction motor. Oil separator and
filtration devices are provided separate
from the compressor. Check valves in
the compressor discharge and lube oil
system and a solenoid valve in the lube
system are also provided.
Refrigeration Circuits
Each unit has two refrigerant circuits,
with one or two rotary screw
compressors per circuit. Each refrigerant
circuit includes a compressor suction
and discharge service valve, liquid line
shutoff valve, removable core filter,
liquid line sight glass with moisture
indicator, charging port and an electronic
expansion valve. Fully modulating
compressors and electronic expansion
valves provide variable capacity
modulation over the entire operating
range.
Unit Controls
All unit controls are housed in an
outdoor rated weathertight enclosure
with removable plates to allow for
customer connection of power wiring
and remote interlocks. All controls,
including sensors, are factory mounted
and tested prior to shipment.
Microcomputer controls provide all
control functions including start-up and
shut down, leaving chilled water
temperature control, compressor and
electronic expansion valve modulation,
fan sequencing, anti-recycle logic,
automatic lead/lag compressor starting
and load limiting. The unit control
module, utilizing Adaptive Control
™
microprocessor, automatically takes
action to avoid unit shutdown due to
abnormal operating conditions
associated with low refrigerant pressure,
high condensing pressure and motor
current overload. Should the abnormal
operating condition continue until a
protective limit is violated, the unit will
be shut down. Unit protective functions
include loss of chilled water flow,
evaporator freezing, loss of refrigerant,
low refrigerant pressure, high refrigerant
pressure, reverse rotation, compressor
starting and running over current, phase
loss, phase imbalance, phase reversal,
and loss of oil flow. A digital display
indicates chilled water setpoint and
leaving chilled water temperature as
standard. While current limit setpoint,
evaporator and condenser refrigerant
pressures, and electrical information are
an option. Both standard and optional
displays can be viewed on the unit
without opening any control panel
doors. Standard power connections
include main three phase power to the
compressors, condenser fans and
control power transformer and optional
connections are available for the 115
volt/60 Hz single phase power for freeze
protection on the evaporator heaters.
Starters
Starters are housed in a weathertight
enclosure with removable cover plate to
allow for customer connection of power
wiring. Across-the-line starters are
standard on all 380-575/60 and 400/50
volt units. Wye Delta closed transition
starters (33 percent of LRA inrush) are
optional on 380-575/60 and 400/50 volt
units and standard on 200-230/60 Hz volt
units. Typically, Trane helical-rotary
screw compressors are up to full speed
in one second when started across-the-
line and have equivalent inrush with
similar size reciprocating compressor
with part wind starters.
Chilled Water Reset
This provides the control logic and
factory installed sensors to reset leaving
chilled water temperature. The setpoint
can be reset based on ambient
temperature or return evaporator water
temperature.
Flow Control
This provides the control logic and relays
to turn the chilled water flow on and off
as the chiller requires for operation and
protection. This function is a
requirement on the Air-Cooled Series R
Chiller.