Chillers With Isolation Valves; Transfer All Refrigerant To; Chiller Condenser Vessel; Chiller Cooler Vessel - Carrier 19XR User Manual

TRANSFER REFRIGERANT FROM CHILLER TO PUMP-
OUT 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 C
b. Slowly open valve 5. When the pressures are
equalized, open liquid line valve 7 to allow liquid
refrigerant to drain by gravity into the pumpout
storage tank.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
C
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 minutes; 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
CONTROL TEST table. Turn on the pumps manu-
ally, 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
C
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 reaches18 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 C C C C C C C C C
g. Turn off the pumpout condenser water and con-
tinue to use the PIC II PUMPDOWN LOCKOUT
screen functions, which lock out the chiller com-
pressor 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.
C C C C
C C
C C C
C C C C
C C C

Chillers with Isolation Valves

TRANSFER ALL REFRIGERANT TO CHILLER CON-
DENSER VESSEL — For chillers with isolation valves,
refrigerant can be stored in one chiller vessel or the other with-
out the need for an external storage tank.
1. Push refrigerant into the chiller condenser.
a. Valve positions:
VALVE
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 liquid
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
manually.
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
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/
ICVC and on refrigerant gages.
d. Close valve 1a.
e. Turn off the pumpout compressor.
f. Close valves 1b, 3, and 4.
VALVE
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 function
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 man-
ually if they are not controlled by the PIC II.
TRANSFER ALL
COOLER VESSEL
1. Push the refrigerant into the chiller cooler vessel.
a. Valve positions:
VALVE
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 con-
denser, close the cooler isolation valve 11.
e. Turn off the pumpout compressor.
70
1a 1b 2 3 4 5 8 11 12 13 14
C C C
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
REFRIGERANT TO CHILLER
1a 1b 2 3 4 5 8 11 12 13 14
C C C
C C C
C C C