Chillers With Isolation Valves - Carrier 23xl Start-Up, Operation And Maintenance Instructions Manual

Chillers with Isolation Valves

TRANSFER ALL REFRIGERANT TO CHILLER CON-
DENSER VESSEL — For chillers with isolation valves, re-
frigerant can be stored in one chiller vessel or the other without
the need for an external storage tank.
1. Push refrigerant into the chiller condenser.
a. Valve positions:
VALVE 1a 1b 2
CONDITION
b. Using the PIC II controls, turn off the chiller water
pumps and pumpout condenser water. If the chiller
water pumps are not controlled through the PIC II,
turn them off manually.
c. Turn on the pumpout compressor to push the liq-
uid refrigerant out of the chiller cooler vessel.
d. When all liquid refrigerant has been pushed into
the chiller condenser vessel, close chiller isolation
valve 11.
e. Access the PUMPDOWN LOCKOUT screen on
the PIC II CONTROL TEST table to turn on the
chiller water pumps. If the chiller water pumps are
not controlled by the PIC II, turn them on manu-
ally.
f. Turn off the pumpout compressor.
2. Evacuate the refrigerant gas from chiller cooler vessel.
a. Close pumpout compressor valves 2 and 5, and
open valves 3 and 4.
VALVE 1a 1b 2
CONDITION
b. Turn on the pumpout condenser water.
c. Run the pumpout compressor until the chiller
cooler vessel pressure reaches 18 in. Hg vac
(40 kPa abs.). Monitor pressures on the CVC and
on refrigerant gages.
d. Close valve 1a.
e. Turn off the pumpout compressor.
f. Close valves 1b, 3, and 4.
VALVE 1a 1b 2
CONDITION C C C C C C C C C C C
g. Turn off the pumpout condenser water.
h. Proceed to the PUMPDOWN/LOCKOUT func-
tion accessed from the CONTROL TEST table to
turn off the chiller water pumps and lock out the
chiller compressor. Turn off the chiller water
pumps manually if they are not controlled by the
PIC II.
TRANSFER ALL REFRIGERANT
COOLER VESSEL
1. Push the refrigerant into the chiller cooler vessel.
a. Valve positions:
VALVE 1a 1b 2
CONDITION
b. Turn off the chiller water pumps (either through
the PIC II controls or manually, if necessary) and
the pumpout condenser water.
c. Turn on the pumpout compressor to push the
refrigerant out of the chiller condenser.
d. When all liquid refrigerant is out of the chiller
condenser, close the cooler isolation valve 11.
3 4 5 8 11 12 13 14
C C C C C C
3 4 5 8 11 12 13 14
C C C C C C C
3 4 5 8 11 12 13 14
TO CHILLER
3 4 5 8 11 12 13 14
C C C C C C
e. Turn off the pumpout compressor.
2. Evacuate the refrigerant gas from the chiller condenser
vessel.
a. Access the PUMPDOWN LOCKOUT function
accessed from the CVC CONTROL TEST table to
turn on the chiller water pumps. Turn the chiller
water pumps on manually if they are not con-
trolled by the PIC II.
b. Close pumpout unit valves 3 and 4; open valves 2
and 5.
VALVE
CONDITION
c. Turn on the pumpout condenser water.
d. Run the pumpout compressor until the chiller con-
denser pressure reaches 18 in. Hg vac (40 kPa
abs.). Monitor pressure at the CVC and at refriger-
ant gages.
e. Close valve 1b.
f. Turn off the pumpout compressor.
g. Close valves 1a, 2, and 5.
VALVE
CONDITION C C C C C C C C C C C
h. Turn off the pumpout condenser water.
i. Proceed to the PUMPDOWN LOCKOUT test
from the CVC CONTROL TEST table to turn off
the chiller water pumps and lock out the chiller
compressor. Turn off the chiller water pumps man-
ually if they are not controlled by the PIC II.
RETURN CHILLER
CONDITIONS
1. Ensure vessel that was opened has been evacuated.
2. Access the TERMINATE LOCKOUT function CVC
from the CONTROL TEST table to view vessel pres-
sures and turn on chiller water pumps. If the chiller
water pumps are not controlled by the PIC II, turn
them on manually.
3. Open valves 1a, 1b, and 3.
VALVE 1a 1b 2
CONDITION
4. Slowly open valve 5, gradually increasing pressure in
the evacuated vessel to 35 psig (141 kPa). Feed refrig-
erant slowly to prevent tube freeze up.
5. Leak test to ensure vessel integrity.
6. Open valve 5 fully.
VALVE 1a 1b 2
CONDITION
7. Open valve 11 to equalize the liquid refrigerant level
between the vessels.
8. Close valves 1a, 1b, 3, and 5.
9. Open isolation valves 12, 13, and 14 (if present).
VALVE 1a 1b 2
C
CONDITION
10. Proceed to the TERMINATE LOCKOUT screen
(accessed from the CONTROL TEST table) to turn off
the water pumps and enable the chiller compressor for
start-up. If the chiller water pumps are not controlled
by the PIC II, turn them off manually.
70
1a 1b 2 3 4 5 8 11 12 13 14
C C C C C C C
1a 1b 2 3 4 5 8 11 12 13 14
TO NORMAL OPERATING
3 4 5 8 11 12 13 14
C C C C C C
3 4 5 8 11 12 13 14
C C C C C
3 4 5 8 11 12 13 14
C C C C C C
C C
C C