Always operate the condenser and chilled water pumps
during charging operations to prevent freeze-ups.
The standard 19XR chiller is shipped with the refrigerant
already charged in the vessels. However, the 19XR may be
ordered with a nitrogen holding charge of 15 psig (103 kPa).
Evacuate the nitrogen from the entire chiller, and charge the
chiller from refrigerant cylinders.
CHILLER EQUALIZATION WITHOUT A PUMPOUT
UNIT
When equalizing refrigerant pressure on the 19XR chiller
after service work or during the initial chiller start-up,
do not use the discharge isolation valve to equalize.
Either the motor cooling isolation valve or the charging
hose (connected between the pumpout valves on top of
the cooler and condenser) should be used as the equal-
ization valve.
To equalize the pressure differential on a refrigerant iso-
lated 19XR chiller, use the terminate lockout function of the
CONTROLTEST on the SERVICE menu. This helps to turn
on pumps and advises the operator on proper procedures.
The following steps describe how to equalize refrigerant
pressure in an isolated 19XR chiller without a pumpout unit.
1. Access terminate lockout function on the CONTROL TEST
screen.
IMPORTANT: Turn on the chilled water and con-
denser water pumps to prevent freezing.
2.
3. Slowly open the refrigerant cooling isolation valve. The
chiller cooler and condenser pressures will gradually equal-
ize. This process takes approximately 15 minutes.
4. Once the pressures have equalized, the cooler isolation
valve, the condenser isolation valve, and the hot gas iso-
lation valve may now be opened. Refer to Fig. 26 and 27,
for the location of the valves.
Whenever turning the discharge isolation valve, be
sure to reattach the valve locking device. This pre-
vents the valve from opening or closing during serv-
ice work or during chiller operation.
CHILLER EQUALIZATION WITH PUMPOUT UNIT —
The following steps describe how to equalize refrigerant pres-
sure on an isolated 19XR chiller using the pumpout unit.
1. Access the terminate lockout function on the CONTROL
TEST screen.
IMPORTANT: Turn on the chilled water and con-
denser water pumps to prevent possible freezing.
2.
3. Open valve 4 on the pumpout unit and open valves 1a
and 1b on the chiller cooler and condenser, Fig. 26 and
27. Slowly open valve 2 on the pumpout unit to equalize
the pressure. This process takes approximately
15 minutes.
4. Once the pressures have equalized, the discharge isola-
tion 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.
Whenever turning the discharge isolation valve, be
sure to reattach the valve locking device. This pre-
vents the valve from opening or closing during serv-
ice work or during chiller operation.
The full refrigerant charge on the 19XR will vary with
chiller components and design conditions, as indicated on
the job data specifications. An approximate charge may be
determined by adding the condenser charge to the cooler charge
as listed in Table 7.
Table 7 — Refrigerant (HFC-134a) Charge
COOLER
CODE
REFRIGERANT
CHARGE
CONDENSER
CODE
REFRIGERANT
CHARGE
lb kg lb kg
10 290 132 10 200 91
11 310 141 11 200 91
12 330 150 12 200 91
15 320 145 15 250 113
16 340 154 16 250 113
17 370 168 17 250 113
20 345 157 20 225 102
21 385 175 21 225 102
22 435 197 22 225 102
30 350 159 30 260 118
31 420 190 31 260 118
32 490 222 32 260 118
35 400 181 35 310 141
36 480 218 36 310 141
37 550 250 37 310 141
40 560 254 40 280 127
41 630 286 41 280 127
42 690 313 42 280 127
45 640 290 45 330 150
46 720 327 46 330 150
47 790 358 47 330 150
50 750 340 50 400 181
51 840 381 51 400 181
52 900 408 52 400 181
55 870 395 55 490 222
56 940 426 56 490 222
57 980 445 57 490 222
60 940 426 60 420 190
61 980 445 61 420 190
62 1020 463 62 420 190
65 1020 463 65 510 231
66 1060 481 66 510 231
67 1090 494 67 510 231
70 1220 553 70 780 354
71 1340 608 71 780 354
72 1440 653 72 780 354
75 1365 619 75 925 420
76 1505 683 76 925 420
77 1625 737 77 925 420
80 1500 680 80 720 327
81 1620 735 81 720 327
82 1730 785 82 720 327
85 1690 766 85 860 390
86 1820 825 86 860 390
87 1940 880 87 860 390
57
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