95
Trim Refrigerant Charge —
If, to obtain optimal
chiller performance, it becomes necessary to adjust the refrig-
erant charge, operate the chiller at design load and then add or
remove refrigerant slowly until the difference between the
leaving chilled water temperature and the cooler refrigerant
temperature reaches design conditions or becomes a minimum.
Do not overcharge.
Refrigerant may be added either through the storage tank or
directly into the chiller as described in the Charge Refrigerant
into Chiller section.
To remove any excess refrigerant, follow the procedure in
Transfer Refrigerant from Chiller to Storage Tank Vessel sec-
tion, page 91.
WEEKLY MAINTENANCE
Check the Lubrication System —
Mark the oil lev-
el 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 and
3). A pump is required when adding oil against refrigerant
pressure. The oil charge for the 19XR compressor depends on
the compressor Frame size:
• Frame 2 compressor — 8 gal (30 L)
• Frame 3 compressor — 8 gal (30 L)
• Frame 4 compressor — 10 gal (37.8 L)
• Frame 4 compressor with split ring diffuser option —
12 gal (45.0 L)
• Frame 5 compressor — 18 gal (67.8 L)
• Frame E 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 page 94. 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 tem-
perature (see the Controls section) when the compressor is off.
The ICVC 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 heating 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 re-
sistance.
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 ac-
tual chiller requirements such as chiller load, run hours, and
water quality.
The time intervals listed in this section are of-
fered as guides to service only.
Service Ontime —
The ICVC 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 between ser-
vice 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 mal-
functions, refer to the Troubleshooting Guide section for con-
trol checks and adjustments.
Check Safety and Operating Controls
Monthly —
To ensure chiller protection, the automated
Control Test should be performed at least once per month.
See Table 6 for safety control settings. See Table 15 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. Early
19XR compressors were designed with the oil filter housing
attached to the oil pump. The following procedure applies
to later 19XR compressors which have the oil filter separate
from the oil pump. Use the following 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 the
power panel, on the top of oil pump assembly.
4. Close the isolation valves located on both ends of the oil
filter. Have rags and a catch basin available to collect oil
spillage.
5. Equalize the filter’s higher internal pressure to ambient
by connecting an oil charging hose to the Schrader valve
on the oil filter housing. Collect the oil-refrigerant mix-
ture which is discharged.
6. Remove the oil filter assembly by loosening the hex nuts
on both ends of the filter assembly.
7. Insert the replacement filter assembly with the arrow on
the housing pointing away from the oil pump.
8. Rotate the assembly so that the Schrader drain valve is
oriented at the bottom, and tighten the connection nut on
each end to a torque of approximately 30 ft-lb (41 N-m).
9. Evacuate the filter housing by placing a vacuum pump on
the charging valve. Follow the normal evacuation proce-
dures. 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 isola-
tion valves to the filter housing, and turn on the power to
the pump and the motor.
CAUTION
Ensure power to the VFD is isolated when cleaning and
tightening connections inside the VFD enclosure. Failure
to disconnect power could result in electrocution. The oil
filter housing is at a high pressure. Relieve this pressure
slowly. Failure to do so could result in serious personal
injury.
CAUTION
The oil filter housing is at a high pressure. Relieve this
pressure slowly. Failure to do so could result in serious per-
sonal injury.
Summary of Contents for AquaEdge 19XR series
Page 69: ...69 Fig 33 19XR Leak Test Procedures a19 1625 ...
Page 154: ...154 Fig 64 Benshaw Inc Wye Delta Unit Mounted Starter Wiring Schematic Low Voltage a19 1873 ...
Page 161: ...161 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v ...
Page 162: ...162 Fig 69 Typical Low Voltage Variable Frequency Drive VFD Wiring Schematic 575 v cont ...
Page 186: ...186 APPENDIX B LEAD LAG WIRING 19XR Lead Lag Schematic Series Cooler Flow a19 1655 ...
Page 187: ...187 APPENDIX B LEAD LAG WIRING cont 19XR Lead Lag Schematic Parallel Cooler Flow a19 1717 ...