Motor Cooling System; Tracer Adaptiview Display - Trane CVHE Installation, Operation And Maintenance Manual

O O p p e e r r a a t t i i n n g g P P r r i i n n c c i i p p l l e e s s
20. Oil reclaim from suction cover (first eductor), 0.25 in. (6.35 mm) OD
21. Motor coolant filter
C C A A U U T T I I O O N N
H H o o t t S S u u r r f f a a c c e e ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s b b e e l l o o w w c c o o u u l l d d r r e e s s u u l l t t i i n n
m m o o d d e e r r a a t t e e i i n n j j u u r r y y . .
S S u u r r f f a a c c e e t t e e m m p p e e r r a a t t u u r r e e s s c c a a n n r r e e a a c c h h 1 1 5 5 0 0 ° ° F F ( ( 6 6 6 6 ° ° C C ) ) . . T T o o
a a v v o o i i d d p p o o s s s s i i b b l l e e s s k k i i n n b b u u r r n n s s , , s s t t a a y y c c l l e e a a r r o o f f t t h h e e s s e e
s s u u r r f f a a c c e e s s . . I I f f p p o o s s s s i i b b l l e e , , a a l l l l o o w w s s u u r r f f a a c c e e s s t t o o c c o o o o l l b b e e f f o o r r e e
s s e e r r v v i i c c i i n n g g . . I I f f s s e e r r v v i i c c i i n n g g i i s s n n e e c c e e s s s s a a r r y y w w h h i i l l e e s s u u r r f f a a c c e e
t t e e m m p p e e r r a a t t u u r r e e s s a a r r e e s s t t i i l l l l e e l l e e v v a a t t e e d d , , y y o o u u M M U U S S T T p p u u t t o o n n
a a l l l l P P e e r r s s o o n n a a l l P P r r o o t t e e c c t t i i v v e e E E q q u u i i p p m m e e n n t t ( ( P P P P E E ) ) . .
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 shut-off valve
will be set during commissioning, but may be adjusted
70
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 N o o t t e 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 Figure 48, p. 69). 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, there is specific information
you need 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 Operations Guide (CTV-SVU01*-EN).
CVHE-SVX02M-EN