Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual page 51

g. Start the chiller water pumps (condenser and cooler),
establishing water flow. At this point, turn on the pum-
pout compressor in auto until the vacuum switch is satis-
fied. This occurs at approximately 15 in Hg vacuum
(48 kPa absolute or 7 psia).
h. Close valves.
VALVE 1A 1B 2
CONDITION C C C
i. Turn off the pumpout condenser water.
Chillers with Isolation Valves
The valves referred to in the following instructions are shown in
Fig. 50 and 51. The cooler/condenser vessels can be used for re-
frigerant isolation for certain service conditions when the isolation
valve package is specified.
Transfer Refrigerant from Cooler to Condenser
a. Turn off chiller water pumps and pumpout condenser
water supply (if applicable). It is assumed that the start-
ing point is as shown in the following table and that pres-
sures in both vessels are above 35 psig (241 kPa).
VALVE 1A 1B
CONDITION C C
b. Open valves 1A, 1B, 2, and 5.
VALVE 1A 1B
CONDITION
c. Turn on pumpout compressor, generating a refrigerant
pressure differential of 10 to 20 psi (69 to 138 kPa) to
push liquid out of the chiller cooler vessel.
d. Slowly open valve 11 to allow liquid transfer.
e. When all liquid has been pushed into the chiller con-
denser vessel, close valve 11.
VALVE 1A 1B
CONDITION
f. Turn off the pumpout compressor.
g. Close pumpout valves 2 and 5 while opening valve 3 and
4 to prepare for removal of remaining refrigerant vapor
in cooler vessel.
VALVE 1A 1B
CONDITION
h. Turn on pumpout condenser water.
i. Turn on pumpout compressor. Turn on the chiller water
pump to establish water flow when the cooler refrigerant
pressure is 35 psig (241 kPa). The water pumps have
to be in operation whenever the refrigerant pressure
is equal to or less than 35 psig (241 kPa) to reduce the
potential of tube damage.
j. Run the pumpout compressor until the cooler pressure
reaches 35 psig (241 kPa), then turn off the pumpout
compressor. Warm chiller cooler water will boil off any
entrapped liquid refrigerant, and chiller pressure will
rise. Repeat this process until the chiller pressure no lon-
ger rises.
k. Run pumpout unit in auto until the vacuum switch is sat-
isfied; this occurs at approximately 15 in. Hg vacuum
(48 kPa absolute or 7 psia). Close valve 1A.
VALVE 1A 1B
CONDITION C
l. Monitor that cooler pressure does not rise (if it does, then
repeat previous step).
3 4 5 6 7 10 11
C C C C C C
2 3 4 5 7 11
C C C C C C
2 3 4 5 7 11
C C C C
2 3 4 5 7 11
C C C C
2 3 4 5 7 11
C C C C
2 3 4 5 7 11
C C C C
m. With service valve 1A closed, shut down pumpout com-
pressor (if still running).
n. Close remaining valves.
VALVE 1A
CONDITION C
o. Turn off pumpout condenser water.
p. Turn off chiller water pumps, and lockout chiller
compressor.
Transfer Refrigerant from Condenser to Cooler
a. Turn off chiller water pumps and pumpout condenser
water supply (if applicable). It is assumed that the start-
ing point is as shown in the following table and that pres-
sures in both vessels are above 35 psig (241 kPa).
VALVE 1A
CONDITION C
b. Set valves as shown below to allow the refrigerant to
equalize:
VALVE 1A
CONDITION
c. Turn on pumpout compressor, and develop a 10 to 20 psi
(69 to 138 kPa) refrigerant differential pressure between
the vessels.
d. Partially open valve 11 while maintaining a refrigerant
pressure differential to push liquid refrigerant out of the
chiller condenser to the cooler.
e. When all liquid is out of the chiller condenser, close
valve 11 and any other isolation valves on the chiller.
f. Turn off the pumpout compressor.
g. Close pumpout valves 3 and 4 while opening valve 2 and
5 to prepare for removal of remaining refrigerant vapor
in condenser vessel.
VALVE 1A
CONDITION
h. Turn on pumpout condenser water.
i. Turn on pumpout compressor.
j. Turn on the chiller water pumps, establishing water
flow when the condenser refrigerant pressure is 35 psig
(241 kPa). The water pumps have to be in operation
whenever the refrigerant pressure is equal to or less
than 35 psig (241 kPa) to reduce the potential of
tube damage.
k. Run the pumpout compressor until the condenser refrig-
erant pressure reaches 35 psig (241 kPa) then turn off the
pumpout compressor. Warm condenser water will boil
off any entrapped liquid refrigerant, and chiller pressure
will rise. Repeat this process until the chiller pressure no
longer rises.
l. Run pumpout unit in auto until the vacuum switch is sat-
isfied; this occurs at approximately 15 in. Hg vacuum
(48 kPa absolute or 7 psia). Close valve 1B.
VALVE 1A
CONDITION
m. Monitor that condenser pressure does not rise (if it does,
then repeat previous step).
n. With service valve 1B closed, shut down pumpout com-
pressor (if still running).
o. Close remaining valves.
VALVE 1A
CONDITION C
51
1B 2 3 4 5 7
C C C C C C
1B 2 3 4 5 7
C C C C C C
1B 2 3 4 5 7
C C C
1B 2 3 4 5 7
C C C
1B 2 3 4 5 7
C C C C
1B 2 3 4 5 7
C C C C C C
11
C
11
C
11
C
11
C
11
C
11
C