Initial Start-Up - Carrier 19XR User Manual

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.
2.
IMPORTANT: Turn on the chilled water and con-
denser water pumps to prevent freezing.
3. Open valve 4 on the pumpout unit and open valves 1a and
1b on the chiller cooler and condenser, Fig. 29 and 30.
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 prevents the valve
from opening or closing during service work or during
chiller operation.
The full refrigerant charge on the 19XR will vary with chill-
er 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 10.
Always operate the condenser and chilled water pumps
whenever charging, transferring, or removing refrigerant
from the chiller.
Use the CONTROL TEST terminate lockout function to
monitor conditions and start the pumps.
If the chiller has been shipped with a holding charge, the
refrigerant is added through the pumpout charging connection
(Fig. 29 and 30, valve 1b). First evacuate the nitrogen holding
charge from the chiller vessels. Charge the refrigerant as a gas
until the system pressure exceeds 35 psig (141 kPa) for
HFC-134a. After the chiller is beyond this pressure the refrig-
erant should be charged as a liquid until all the recommended
refrigerant charge has been added. The charging valve (Fig. 29
and 30, valve 7) can be used to charge liquid to the cooler if the
cooler isolation valve (11) is present and is closed. Do not
charge liquid through the linear float to the condenser.
TRIMMING REFRIGERANT CHARGE — The 19XR is
shipped with the correct charge for the design duty of the chill-
er. Trimming the charge can best be accomplished when the
design load is available. To trim the charge, check the tempera-
ture difference between the leaving chilled water temperature
and cooler refrigerant temperature at full load design condi-
tions. If necessary, add or remove refrigerant to bring the
temperature difference to design conditions or minimum
differential.
Table 10 lists the 19XR chiller refrigerant charges for each
cooler and condenser code. Total refrigerant charge is the sum
of the cooler and condenser charge.
Table 10 — Refrigerant (HFC-134a) Charge
REFRIGERANT
COOLER
CHARGE
CODE
lb
10 290
11 310
12 330
15 320
16 340
17 370
20 345
21 385
22 435
30 350
31 420
32 490
35 400
36 480
37 550
40 560
41 630
42 690
45 640
46 720
47 790
50 750
51 840
52 900
55 870
56 940
57 980
60 940
61 980
62 1020
65 1020
66 1060
67 1090
70 1220
71 1340
72 1440
75 1365
76 1505
77 1625
80 1500
81 1620
82 1730
85 1690
86 1820
87 1940

INITIAL START-UP

Preparation —
Before starting the chiller, verify:
1. Power is on to the main starter, oil pump relay, tower fan
starter, oil heater relay, and the chiller control panel.
2. Cooling tower water is at proper level and at-or-below
design entering temperature.
3. Chiller is charged with refrigerant and all refrigerant and
oil valves are in their proper operating positions.
4. Oil is at the proper level in the reservoir sight glasses.
5. Oil reservoir temperature is above 140 F (60 C) or above
refrigerant temperature plus 50° F (28° C).
6. Valves in the evaporator and condenser water circuits are
open.
NOTE: If the pumps are not automatic, ensure water is
circulating properly.
Do not permit water or brine that is warmer than 110 F
(43 C) to flow through the cooler or condenser. Refrigerant
overpressure may discharge through the relief valves and
result in the loss of refrigerant charge.
7. Access the CONTROL TEST screen. Scroll down on the
TERMINATE LOCKOUT option. Press the SELECT (to
enable the chiller to start) and answer YES to reset unit to
operating mode. The chiller is locked out at the factory in
order to prevent accidental start-up.
64
REFRIGERANT
CONDENSER
CHARGE
CODE
kg lb
132 10 200
141 11 200
150 12 200
145 15 250
154 16 250
168 17 250
157 20 225
175 21 225
197 22 225
159 30 260
190 31 260
222 32 260
181 35 310
218 36 310
250 37 310
254 40 280
286 41 280
313 42 280
290 45 330
327 46 330
358 47 330
340 50 400
381 51 400
408 52 400
395 55 490
426 56 490
445 57 490
426 60 420
445 61 420
463 62 420
463 65 510
481 66 510
494 67 510
553 70 780
608 71 780
653 72 780
619 75 925
683 76 925
737 77 925
680 80 720
735 81 720
785 82 720
766 85 860
825 86 860
880 87 860
kg
91
91
91
113
113
113
102
102
102
118
118
118
141
141
141
127
127
127
150
150
150
181
181
181
222
222
222
190
190
190
231
231
231
354
354
354
420
420
420
327
327
327
390
390
390