Catalogue

RLC-PRC029-EN 133
Mechanical Specifications
Condenser (RTWD only)
Dual circuited, shell and tube condenser designed with seamless internally/externally finned tubes
expanded into tubesheets and mechanically fastened to tube supports. Condenser tubes are 1.0
inch (25.4 mm) diameter on standard efficiency chillers and 0.75 inch (19.05 mm) diameter on high
and premium efficiency chillers. All tubes can be individually replaced.
Shells and tube sheets are made of carbon steel. Designed, tested, and stamped in accordance with
ASME code. The condenser is designed for refrigerant-side/working-side pressure of 300 psig (20.7
bars).
Water side has single inlet and outlet piping connection. All water pass arrangements are available
with grooved connections with 150 psig (10.5 bars) waterside working pressure. Waterside shall
be hydrostatically tested at 225 psig (15.5 bars).
Standard temperature condenser allow for leaving condenser water temperature up to 105°F
(40.6°C) and for entering condenser water temperatures up to 95°F (35°C).
Condenser (Trane air-cooled only)
Air-cooled condenser coils have aluminum fins mechanically bonded to internally finned seamless
copper tubing. The condenser coil has a subcooling circuit. Condensers are factory proof and leak
tested at 400 psig (27.6 bars).
Direct-drive vertical discharge condenser fans are balanced. Three-phased condenser fan motors
with permanently lubricated ball bearings and inherent overheat protection in each phase are
provided.
Standard ambient units start and operate from 32°F to 125°F (0°C to 52°C).
Refrigerant Circuit
Each unit has two refrigerant circuits, with one rotary screw compressor per circuit. Each
refrigerant circuit includes compressor suction and discharge service valves, liquid line shut off
valve, removable core filter, charging port and an electronic expansion valve. Modulating
compressors and electronic expansion valves provide variable capacity modulation over the entire
building load and maintain proper refrigerant flow.
Oil Management
The unit is configured with an oil management system that ensures proper oil circulation
throughout the unit. The key components of the system include an oil separator, oil filter and gas
pump. An optional oil cooler is installed when the unit is used for high condensing temperature
or low evaporator temperature conditions. For example: remote condensers, heat recovery, water-
to-water heat pump, ice making and low temperature process applications.
Unit Controls (Trane CH530)
The microprocessor-based control panel is factory-installed and factory-tested. The control system
is powered by a pre-wired 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 Trane 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 will shut down.