Product Manual WHR-2 73
2.04 CHILLER COMPONENTS
A. Compressor: The compressor shall be of the accessible hermetic reciprocating
type with suction and discharge service valves, crankcase oil heater and suction
strainer. Compressor shall have a forced feed lubrication system with a reversible
oil pump, oil sight glass, and oil charge. The compressor motor shall be
refrigerant gas cooled, high torque, hermetic induction type, four-pole, with
inherent thermal protection on all three phases and shall be mounted on rubber
vibration isolators. Provide part-winding start on 208/230 volt units and across-
the-line start on 380/460/575 volt units.
B. Evaporator: The evaporator shall be direct expansion type with steel shell,
internal water baffles, and internally finned copper tubes roller expanded into
carbon steel tube sheets. Refrigerant heads shall be removable. The cooler shall
be insulated with a heavy layer of closed cell foamed insulation. It shall be
designed, tested and stamped in accordance with ASME Code requirements.
C. Condenser: Horizontal shell and finned tube type with steel shell and integral
finned copper tubes rolled into steel tube sheets which are to be drilled, and
multiple grooved to facilitate gas-tight rolling. The condenser shall be equipped
with intermediate tube supports. Construct condenser in accordance with the
requirements of ASME Section VIII Unfired Pressure Vessel Code. It shall be
designed for 225 psi (1552 kPa) water side working pressure and 450 psig (3104
kPa) refrigerant side pressure and be provided with an ASME, pressure relief
valve.
D. Refrigerant Circuit: The refrigerant circuit shall include a liquid line shutoff valve,
replaceable core filter-drier, sight glass with moisture indicator, liquid line
solenoid valve (no exceptions), thermal expansion valve, discharge gas muffler,
insulated suction line and a 450 psig (3104 kPa) relief valve.
E. Control System: A centrally located control panel shall contain the field power
connection points, control interlock terminals, and control system. Power and
starting components shall include automatic circuit breakers, fused control circuit
with transformer, a motor contactor, solid-state start timer, solid-state compressor
three-phase motor overload protection, and unit power terminal blocks for
connection to remote disconnect switch. Hinged access doors shall be lockable.
Deadfront panels are required to protect against accidental contact with line
voltage when accessing the control system.
Safety and operating control shall include unit control stop switch, recycling
pumpdown control, oil safety switch, high and low pressure safety switch, water
temperature controller, freeze protection pressurestat. Unit shall provide limited
recycling pumpdown protection at all times.
F. The following options are to be included:
• Part winding start
• Three phase power loss with under and over voltage protection
• Refrigerant and oil pressure gauges
• High return water thermostat to keep compressor unloaded with high
startup water temperatures. Contractor to field mount sensor and field
wire to control panel.
• Hot gas bypass on all circuits
• Chilled water flow switch to be field mounted by the contractor and field
wired to terminals in the control panel.
• R-I-S or spring vibration isolators for field installation per plans.
• Acoustic sound enclosure
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