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RLC-PRC020-EN
Mechanical
Specifications
General
Exposed metal surfaces are painted with
air-dry beige, direct-to-metal, single-
component paint. Each unit ships with
full operating charges of refrigerant and
oil. Molded neoprene isolation pads are
supplied for placement under all support
points. Startup and operator instruction
by factory-trained service personnel are
included.
Compressor and Motor
The unit is equipped with a semi-
hermetic, direct-drive, 3600-rpm (3000
rpm @ 50 Hz) rotary compressor that
includes a capacity control slide valve, oil
sump heater, and differential pressure
refrigerant oil flow system. Four
pressure-lubricated, rolling-element
bearing groups support the rotating
assembly.
The motor is a suction gas-cooled,
hermetically sealed, two-pole, squirrel
cage induction-type.
Evaporator and Condenser
Shells are carbon steel plate. The
evaporator and condenser are designed,
tested, and stamped in accordance with
ASME Code for refrigerant-side/
working-side pressure of 200 psig.
All tube sheets are made of carbon steel;
tubes are mechanically expanded into
tube sheets and mechanically fastened
to tube supports. Evaporator tubes are
1.0-inch (25.4 mm) diameter and
condenser tubes are 0.75-inch
(19.05 mm) diameter. Both types can be
individually replaced. Standard tubes are
externally finned, internally enhanced
seamless copper with lands at all tube
sheets.
All water pass arrangements are
available with grooved connections (150
or 300 psig waterside). All connections
may be either right- or left-handed.
Waterside shall be hydrostatically tested
at 1.5X design working pressure.
Refrigerant Circuit
An electronically controlled expansion
valve is provided to maintain proper
refrigerant flow.
Unit Controls (CH530)
The microprocessor-based control panel
is factory-installed and factory-tested.
The control system is powered by a
control power transformer, and will load
and unload the chiller through
adjustment of the compressor slide
valve. Microprocessor-based chilled
water reset based on return water is
standard.
The CH530 microprocessor
automatically acts to prevent unit
shutdown due to abnormal operating
conditions associated with low
evaporator refrigerant temperature, high
condensing temperature, and/or motor
current overload. If an abnormal
operating condition continues and the
protective limit is reached, the machine
should shut down.
The panel includes machine protection
shutdown requiring
manual reset
for the
following conditions:
• low evaporator refrigerant temperature
and pressure
• high condenser refrigerant pressure
• low oil flow
• critical sensor or detection circuit faults
• motor current overload
• high compressor discharge
temperature
• lost communication between modules
• electrical distribution faults: phase loss,
phase imbalance, or phase reversal
• external and local emergency stop
• starter transition failure
The panel also includes machine
protection shutdown with
automatic
reset
for the following correctable
conditions:
• momentary power loss
• under/over voltage
• loss of evaporator or condenser water
flow
When a fault is detected, the control
system conducts more than 100
diagnostic checks and displays results.
The display will identify the fault,
indicate date, time, and operating mode
at time of occurrence, and provide type
of reset required and a help message.
The diagnostic history will display the
last ten diagnostics with their times and
dates of occurrence.
Clear Language Display Panel
Factory-mounted to the control panel
door, the operator interface has an LCD
touch-screen display for operator input
and information output. This interface
provides access to the following
information: evaporator report,
condenser report, compressor report,
ASHRAE Guideline 3 report, operator
settings, service settings, service tests,
and diagnostics. All diagnostics and
messages are displayed in “clear
language.”