Trane Technologies CenTraVac CVHE, Installation, Operation And Maintenance Manual

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CVHE-SVX005B-EN 75
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To ensure proper lubrication and prevent refrigerant
from condensing in the oil tank, a 750-watt heater is in
a well in the oil tank. The heater is used to warm the oil
while the unit is off. With the default settings for R-123,
the oil heater is de-energized when the unit starts. With
the default settings for R-514A, Running Oil
Temperature Control is enabled, and the Running Oil
Temperature Setpoint is factory-programmed at 100°F
(37.8°C). With either refrigerant, the heater energizes as
needed to maintain 140°F to 145°F (60.0°C to 62.8°C)
when the chiller is not running.
With R-123 and mineral oil, when the chiller is
operating, the temperature of the oil tank is typically
100°F to 160°F (37.8°C to 71.1°C). With R-514A, solid
state oil heater control is installed and enabled. The oil
return lines from the thrust and journal bearings
transport oil and some seal leakage refrigerant. The oil
return lines are routed into a manifold and separator
under the motor. Gas flow exits the top of the manifold
and is vented to the evaporator. Oil exits the bottom of
the manifold and returns to the tank. Separation of the
seal leakage gas in the separator keeps this gas out of
the tank.
A dual eductor system is used to reclaim oil from the
suction cover and the evaporator, and deposit it back
into the oil tank. These eductors use high-pressure
condenser gas to draw the oil from the suction cover
and evaporator to the eductors and then discharge into
the oil tank. The evaporator eductor line has a shut-off
valve mounted by the evaporator. The position of the
shut-off valve will be set at three-quarters of a turn
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 two turns open.
N No otte e:: Depending on operating conditions, the oil
sump’s normal operating oil level may vary from
just below the bottom sight glass to near the top
of the upper sight glass.
Liquid refrigerant is used to cool the oil supply to both
the thrust bearing and journal bearings. On refrigerant
pump units, the oil cooler is located inside the
economizer and uses refrigerant passing from the
condenser to evaporator to cool the oil. Oil leaves the
oil cooler and flows to both the thrust and journal
bearings.
Motor Cooling System
Compressor motors are cooled with liquid refrigerant
(refer to the figures in
“Compressor Lubrication
System,” p. 72 ). 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 connection is on the side
where a weir ensures a preferential supply of liquid
refrigerant. 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,
graphs, and reports put information conveniently at
your fingertips. For more information, refer to
Tracer
®
AdaptiView
™
Display for Water-cooled CenTraVac
Chillers with Symbio Controls User Guide (CTV-
SVU004*-EN).
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