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CAUTION
Hot Surface!
Failure to follow instructions below could result in
moderate injury.
Surface temperatures can reach 150°F (66°C). To
avoid possible skin burns, stay clear of these
surfaces. If possible, allow surfaces to cool before
servicing. If servicing is necessary while surface
temperatures are still elevated, you MUST put on all
Personal Protective Equipment (PPE).
WARNING
Hazardous Voltage in Oil Tank Junction
Box Enclosure and Oil Pump Motor
Terminal Box!
Failure to disconnect main power and/or auxiliary
control power before opening oil tank junction box
enclosure or any other junction box/terminal box/
panel on the chiller can result in death or serious
injury.
Disconnect all power and apply lockout/tagout
devices. Follow all company procedures for lockout/
tagout. Unit must be tested to ensure a zero energy
state and equipment must be put in an electrically
safe work condition prior to maintenance. Hazardous
voltage up to 600 Vac is present in the oil tank
junction box enclosure and oil pump motor terminal
box.
Note: Graphic labels (shown above) are used for CE
application only.
Important:
•
Before servicing, disconnect all power
sources and allow at least 30 minutes for
capacitors to discharge.
•
All electrical enclosures—unit or remote—
are IP2X.
CDHH-SVX003C-EN
X39003892001A
To ensure proper lubrication and prevent refrigerant from
condensing in the oil tank, two 750-watt heaters are in
wells in the oil tank and are used to heat the oil while the
unit is off. With the default settings, the oil heaters are de-
energized when the unit starts. The heaters energize as
needed to maintain 128°F to 133°F (53.3°C to 56.1°C)
when the chiller is not running.
When the chiller is operating, the temperature of the oil
tank is typically 100°F to 140°F (37.8°C to 60.0°C). The oil
return lines are routed into a separation chamber in the oil
tank. Gas flow exits out the top of the oil tank and is vented
to the evaporator.
A dual eductor system, using high pressure condenser gas,
reclaims oil from the suction cover and the evaporator. The
suction cover eductor is discharged into the evaporator,
and the evaporator eductor is discharged into the oil tank.
The evaporator eductor line has a shut-off valve mounted
on the evaporator. The position of the shut-off valve will be
set at two turns open during commissioning but may be
adjusted later by a qualified technician as necessary for oil
return. A normal operating setting for the valve may range
from full closed to full open.
Oil supply to both the thrust bearing and journal bearings is
cooled when the oil tank temperature reaches 140°F (60.0°
C). The supply oil and liquid refrigerant are pumped to a
brazed plate heat exchanger. The unit controller monitors
oil tank temperature and opens a solenoid valve to allow
liquid refrigerant to flow into the heat exchanger.
Motor Cooling System
Compressor motors are cooled with liquid refrigerant (refer
to the figure in
"Compressor Lubrication System," p.
The refrigerant pump is located on the front of the oil tank
(motor inside the oil tank). The refrigerant pump inlet is
connected to the well at the bottom of the condenser. The
well design ensures preferential supply of liquid refrigerant
to the refrigerant pump before refrigerant is supplied to the
economizer. Refrigerant is delivered to the motor via the
pump. An in-line filter is installed (replace the in-line filter
only with major service). Motor refrigerant drain lines are
routed to the condenser.
®
Tracer
AdaptiView™ Display
Information is tailored to operators, service technicians,
and owners.
When operating a chiller, specific information is needed
you needed on a day-to-day basis—setpoints, limits,
diagnostic information, and reports.
Day-to-day operational information is presented at the
display. Logically organized groups of information—chiller
modes of operation, active diagnostics, settings, and
reports put information conveniently at your fingertips. For
more information, refer to Tracer
Water-cooled CenTraVac™ Chillers with Symbio™
Controls User Guide (CTV-SVU004*-EN).
Operating Principles
79).
®
AdaptiView™ Display for
81
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