WEEKLY MAINTENANCE
Check the Lubrication System —
Mark the oil level
on the reservoir sight glass, and observe the level each week
while the chiller is shut down.
If the level goes below the lower sight glass, check the oil
reclaim system for proper operation. If additional oil is re-
quired, add it through the oil drain charging valve (Fig. 2).
A pump is required when adding oil against refrigerant pres-
sure. The oil charge for the 19XR compressor depends on
the compressor Frame size:
• Frame 2 compressor — 5 gal (18.9 L)
• Frame 3 compressor — 8 gal (30 L)
• Frame 4 compressor — 10 gal (37.8 L)
• Frame 5 compressor — 18 gal (67.8 L)
The added oil must meet Carrier specifications for the 19XR.
Refer to Changing Oil Filter and Oil Changes section on this
page. Any additional oil that is added should be logged by
noting the amount and date. Any oil that is added due to oil
loss that is not related to service will eventually return to the
sump. It must be removed when the level is high.
An oil heater is controlled by the PIC II to maintain oil
temperature (see the Controls section) when the compressor
is off. The CVC COMPRESS screen displays whether the
heater is energized or not. The heater is energized if the OIL
HEATER RELAY parameter reads ON. If the PIC II shows
that the heater is energized and if the sump is still not heat-
ing up, the power to the oil heater may be off or the oil level
may be too low. Check the oil level, the oil heater contactor
voltage, and oil heater resistance.
The PIC II does not permit compressor start-up if the oil
temperature is too low. The PIC II continues with start-up
only after the temperature is within allowable limits.
SCHEDULED MAINTENANCE
Establish a regular maintenance schedule based on your
actual chiller requirements such as chiller load, run hours,
and water quality. The time intervals listed in this section
are offered as guides to service only.
Service Ontime —
The CVC will display a SERVICE
ONTIME value on the MAINSTAT screen. This value should
be reset to zero by the service person or the operator each
time major service work is completed so that the time be-
tween service can be viewed and tracked.
Inspect the Control Panel —
Maintenance consists
of general cleaning and tightening of connections. Vacuum
the cabinet to eliminate dust build-up. If the chiller control
malfunctions, refer to the Troubleshooting Guide section for
control checks and adjustments.
Ensure power to the control center is off when cleaning
and tightening connections inside the control panel.
Check Safety and Operating Controls Monthly
—
To ensure chiller protection, the automated Control Test
should be performed at least once per month. See Table 3
for safety control settings. See Table 6 for Control Test
functions.
Changing Oil Filter —
Change the oil filter on a yearly
basis or when the chiller is opened for repairs. The 19XR
has an isolatable oil filter so that the filter may be changed
with the refrigerant remaining in the chiller. Use the follow-
ing procedure:
1. Ensure the compressor is off and the disconnect for the
compressor is open.
2. Disconnect the power to the oil pump.
3. Close the oil filter isolation valves located behind power
panel on top of oil pump assembly.
4. Connect an oil charging hose from the oil charging valve
(Fig. 2) and place the other end in a clean container suit-
able for used oil. The oil drained from the filter hous-
ing should be used as an oil sample and sent to a labo-
ratory for proper analysis. Do not contaminate this
sample.
5. Slowly open the charging valve to drain the oil from the
housing.
The oil filter housing is at a high pressure. Relieve
this pressure slowly.
6. Once all oil has been drained, place some rags or
absorbent material under the oil filter housing to catch
any drips once the filter is opened. Remove the 4 bolts
from the end of the filter housing and remove the filter
cover.
7. Remove the filter retainer by unscrewing the retainer nut.
The filter may now be removed and disposed of
properly.
8. Replace the old filter with a new filter. Install the filter
retainer and tighten down the retainer nut. Install the
filter cover and tighten the 4 bolts.
9. Evacuate the filter housing by placing a vacuum pump
on the charging valve. Follow the normal evacuation
procedures. Shut the charging valve when done and
reconnect the valve so that new oil can be pumped into
the filter housing. Fill with the same amount that was
removed; then close the charging valve.
10. Remove the hose from the charging valve, open the iso-
lation valves to the filter housing, and turn on the power
to the pump and the motor.
Fig. 33 — Guide Vane Actuator Linkage
66
Summary of Contents for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR
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