19XR (PIC II) Hermetic Centrifugal Liquid Chillers 50 Hz - Carrier

To pressurize with dry nitrogen
Another method of leak testing is to pressurize with nitrogen
only and to use a soap bubble solution or an ultrasonic leak
detector to determine if leaks are present. This should only be
done if all refrigerant has been evacuated from the vessel.
1. Connect a copper tube from the pressure regulator on the
cylinder to the refrigerant charging valve.
2. Never apply full cylinder pressure to the pressurizing line.
Follow the listed sequence.
3. Open the charging valve fully.
4. Slowly open the cylinder regulating valve.
5. Observe the pressure gauge on the chiller and close the
regulating valve when the pressure reaches test level. Do
not exceed 965 kPa.
6. Close the charging valve on the chiller. Remove the
copper tube if no longer required.
Repair the leak, retest and apply standing vacuum test
After pressurizing the chiller, test for leaks with an electronic
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, and then dehydrate the chiller. Refer to the Standing
Vacuum Test and Chiller Dehydration in the Before Initial
Start-Up section.
7.1.7 - Checking Guide Vane Linkage
When the chiller is off, the guide vanes are closed and the
actuator mechanism is in the position shown in Fig. 29. If slack
develops in the drive chain, backlash can be eliminated as
follows:
1. With the chiller shut down and the actuator fully closed,
remove the chain guard and loosen the actuator bracket
holddown bolts.
2. Loosen guide vane sprocket adjusting bolts.
3. Pry bracket upwards to remove slack, then retighten the
bracket holddown bolts.
4. Retighten the guide vane sprocket adjusting bolts. Make
sure that the guide vane shaft is rotated fully in the
clockwise direction in order for it to be fully closed.
7.1.8 - Trim Refrigerant Charge
If, to obtain optimal chiller performance, it becomes necessary
to adjust the refrigerant charge, operate the chiller at design load
and then add or remove refrigerant slowly until the difference
between 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 Pumpout Storage Tank
section, Steps 1a and b.
1. Actuator sprocket
2. Chain guard
3. Guide vane shaft
4. Electronic vane actuator
5. Drive chain
6. Actuator bracket hold-down bolts
7. Guide vane sprocket
8. Guide vane sprocket adjusting bolts
Fig. 29 - Guide vane actuator linkage
7.2 - 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 required, add it
through the oil drain charging valve (Fig. 4). A pump is required
for adding oil against refrigerant pressure. The oil charge is
approximately:
Compressor size Oil charge (l)
2 19
3 30
4 38
5 68
The added oil must meet Carrier specifications for the 19XR.
Refer to Changing Oil Filter and Oil Changes section on this
and the next 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.
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