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

The valve is opened counter-clockwise, and closed clockwise.
4.14 - 19XR chiller equalization with pumpout unit
The following procedure describes how to equalize refrigerant
pressure on an isolated 19XR chiller using the pumpout unit:
1. Access the TERMINATE LOCKOUT mode in the
Control Test.
2. Turn on the chilled water and condenser water pumps to
prevent possible freezing.
3. Open valve 4 on the pumpout unit and open valves 1a and
1b on the chiller cooler and condenser, Fig. 18 and 19.
Slowly open valve 2 on the pumpout unit to equalize the
pressure. This process will take approximately 15 minutes.
4. Once the pressures have equalized, the discharge isolation
valve, cooler isolation valve, optional hot gas bypass isolation
valve, and the refrigerant isolation valve can be opened.
Close valves 1a and 1b, and all pumpout unit valves.
The full refrigerant charge on the 19XR will vary with chiller
components and design conditions, indicated on the job data
specifications. An approximate charge may be found by adding
the condenser charge to the cooler charge listed in Table 7.
Always operate the condenser and chilled water pumps during
charging operations to prevent freeze-ups. Use the Control Test
Terminate Lockout to monitor conditions and start the pumps.
If the chiller has been shipped with a holding charge, the
refrigerant will be added through the refrigerant charging valve
(Fig. 18 and 19, valve 7) or to the pumpout charging connection.
First evacuate the nitrogen holding charge from the chiller
vessels. Charge the refrigerant as a gas until the system pressure
exceeds 141 kPa for HFC-134a. After the chiller is beyond this
pressure the refrigerant should be charged as a liquid until all
the recommended refrigerant charge has been added.
4.15 Trimming refrigerant charge
The 19XR is shipped with the correct charge for the design duty
of the chiller. Trimming the charge can best be accomplished
when design load is available. To trim, check the temperature
difference between leaving chilled water temperature and
cooler refrigerant temperature at full load design conditions. If
necessary, add or remove refrigerant to bring the temperature
difference to design conditions or minimum differential. If the
unit incorporates a sight glass (option) and has a full charge,
bubbling must take place in the upper level of the vessel.
Evaporator size Refrigerant charge (kg)
30 277
31 308
32 340
35 322
36 359
37 391
40 381
41 413
42 440
45 440
46 477
47 508
50 520
51 560
52 589
55 617
56 648
57 667
60 616
61 635
62 653
65 694
66 712
67 725
70 907
71 962
72 1007
75 1039
76 1103
77 1157
80 1007
81 1062
82 1112
85 1156
86 1215
87 1270
45