Procedures - Carrier 19XR Start-Up, Operation And Maintenance Instructions Manual

Chillers with Storage Tanks —
lation valves, leave them open for the following procedures.
The letter ''C'' describes a closed valve. See Fig. 15, 16, 26,
and 27.
TRANSFER REFRIGERANT FROM PUMPOUT STOR-
AGE TANK TO CHILLER
1. Equalize refrigerant pressure.
a. Use the PIC II terminate lockout function on the PUMP-
DOWN LOCKOUT screen, accessed from the CON-
TROL TEST table to turn on the water pumps and
monitor pressures.
If the chilled water and condenser water pumps are
not controlled by the PIC II, these pumps must be
started and stopped manually at the appropriate times
during the refrigerant transfer procedure.
b. Close pumpout unit valves 2, 4, 5, 8, and 10, and close
chiller charging valve 7; open chiller isolation valves
11, 12, 13, and 14 (if present).
c. Open pumpout unit/storage tank valves 3 and 6, open
chiller valves 1a and 1b.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION C
d. Slowly open valve 5 to increase chiller pressure to
68 psig 35 psig (141 kPa) for HFC-134a. Feed refrig-
erant slowly to prevent freeze up.
e. Open valve 5 fully after the pressure rises above the
freeze point of the refrigerant. Open liquid line valves
7 and 10 until refrigerant pressure equalizes.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION C
2. Transfer the remaining refrigerant.
a. Close valve 5 and open valve 4.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION C
b. Turn off the chiller water pumps using the CVC (or
manually, if necessary).
c. Turn off the pumpout condenser water, and turn on the
pumpout compressor to push liquid out of the storage
tank.
d. Close liquid line valve 7.
e. Turn off the pumpout compressor.
f. Close valves 3 and 4.
g. Open valves 2 and 5.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION
h. Turn on the pumpout condenser water.
i. Run the pumpout compressor until the pumpout stor-
age tank pressure reaches 5 psig (34 kPa) (18 in. Hg
[40 kPa absolute] if repairing the tank).
j. Turn off the pumpout compressor.
k. Close valves 1a, 1b, 2, 5, 6, and 10.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION C C C C C C C C C C
l. Turn off pumpout condenser water.
If the chiller has iso-
C C C C C
C C
C C
C C C C
TRANSFER REFRIGERANT FROM CHILLER TO
PUMPOUT STORAGE TANK
1. Equalize refrigerant pressure.
a. Valve positions:
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION
b. Slowly open valve 5. When the pressures are equal-
ized, open liquid line valve 7 to allow liquid refrig-
erant to drain by gravity into the pumpout storage tank.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION
2. Transfer the remaining liquid.
a. Turn off the pumpout condenser water. Place the valves
in the following positions:
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION
b. Run the pumpout compressor for approximately 30 min-
utes; then close valve 10.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION
c. Turn off the pumpout compressor.
3. Remove any remaining refrigerant.
a. Turn on the chiller water pumps using the PUMP-
DOWN LOCKOUT screen, accessed from the CON-
TROL TEST table. Turn on the pumps manually, if
they are not controlled by the PIC II.
b. Turn on the pumpout condenser water.
c. Place valves in the following positions:
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION
d. Run the pumpout compressor until the chiller pres-
sure reaches 30 psig (207 kPa) for HFC-134a. Then,
shut off the pumpout compressor. Warm condenser
water will boil off any entrapped liquid refrigerant and
the chiller pressure will rise.
e. When the pressure rises to 40 psig (276 kPa) for
HFC-134a, turn on the pumpout compressor until the
pressure again reaches 30 psig (207 kPa), and then
turn off the pumpout compressor. Repeat this process
until the pressure no longer rises. Then, turn on the
pumpout compressor and pump until the pressure reaches
18 in. Hg. (40 kPa absolute).
f. Close valves 1a, 1b, 3, 4, 6, 7, and 10.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
CONDITION C
g. Turn off the pumpout condenser water and continue to
use the PIC II PUMPDOWN LOCKOUT screen func-
tions, which lock out the chiller compressor for
operation.
4. Establish a vacuum for service.
To conserve refrigerant, operate the pumpout compressor
until the chiller pressure is reduced to 18 in. Hg vac., ref
30 in. bar. (40 kPa abs.) following Step 3e.
63
C C C C C
C C C
C C C
C C C C
C C C C
C C C C C C C C C