Weekly Maintenance - Carrier 19XRV Start-Up, Operation And Maintenance Instructions Manual

TO PRESSURIZE WITH DRY NITROGEN
NOTE: Pressurizing with dry nitrogen for leak testing should
not be done if the full refrigerant charge is in the vessel
because purging the nitrogen is very difficult.
1. Connect a copper tube from the pressure regulator on the
cylinder to the refrigerant charging valve. Never apply
full cylinder pressure to the pressurizing line. Follow the
listed sequence.
2. Open the charging valve fully.
3. Slowly open the cylinder regulating valve.
4. Observe the pressure gage on the chiller and close the
regulating valve when the pressure reaches test level. Do
not exceed 140 psig (965 kPa).
5. Close the charging valve on the chiller. Remove the
copper tube if it is no longer required.
Repair the Leak, Retest, and Apply Standing
After pressurizing the chiller, test for
Vacuum Test —
leaks with an electronic halide leak detector, soap bubble
solution, or an ultrasonic leak detector. Bring the chiller back to
atmospheric pressure, repair any leaks found, and retest.
After retesting and finding no leaks, apply a standing
vacuum test. Then dehydrate the chiller. Refer to the Standing
Vacuum Test and Chiller Dehydration section (pages 58 and
61) in the Before Initial Start-Up section.
Checking Guide Vane Linkage —
is off, the guide vanes are closed and the actuator mechanism is
in the position shown in Fig. 41. Slack in the guide vane actua-
tor's drive chain can only be removed with the guide vane
actuator fully closed and the chiller shut down. Complete the
following steps to adjust chain tension and position:
1. Remove the two set screws in the guide vane actuator
sprocket.
2. Loosen the guide vane actuator's holddown bolts.
3. Pull the guide vane actuator away from the suction hous-
ing along the slotted holes in the actuator bracket.
4. Rotate the guide vane sprocket fully clockwise and
spot-drill the guide vane actuator shaft. Spot-drilling is
necessary when the guide vane actuator sprocket set
screws on the guide vane actuator shaft need to be
re-seated. (Remember: Spot-drill and tighten the first set
screw before spot-drilling for the second set screw.)
CHAIN
GUARD
When the chiller
GUIDE VANE
ACTUATOR
SHAFT
SET
SCREWS
GUIDE VANE
ACTUATOR
SPROCKET
DRIVE
CHAIN
GUIDE VANE
SPROCKET
Fig. 41 — Guide Vane Actuator Linkage
Trim Refrigerant Charge —
frigerant, follow the procedure in Transfer Refrigerant from
Chiller to Pumpout Storage Tank section, Steps 1a and b,
page 75.
Refer to the Trimming Refrigerant Charge section on
page 69.

WEEKLY MAINTENANCE

Check the Lubrication System —
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
required, add it through the oil drain charging valve (Fig. 2). A
pump is required when adding oil against refrigerant pressure.
The oil charge for the 19XRV 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 — 12 gal
(45 L)
• Frame 5 compressor — 18 gal (67.8 L)
The added oil must meet Carrier specifications for the
19XRV. Refer to Changing Oil Filter and Oil Changes section
on page 79. 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 III to maintain oil
temperature (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 III 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 resistance.
The PIC III does not permit compressor start-up if the oil
temperature is too low. The PIC III continues with start-up only
after the temperature is within allowable limits.
GUIDE VANE
ACTUATOR
HOLDDOWN
BOLTS (3)
GUIDE VANE
SHAFT
78
To remove any excess re-
Mark the oil level
SUCTION
HOUSING
ACTUATOR
BRACKET
a19-1731