14
tank, followed by valves 7 and 10 to allow liquid
refrigerant to drain by gravity.
2. Push remaining liquid, followed by refrigerant vapor re-
moval from chiller.
a. To prepare for liquid push, turn off the pumpout
condenser water. Place valves in the following
positions:
b. Run the pumpout compressor in manual until all
liquid is pushed out of the chiller (approximately
45 minutes). Close valves 2, 5, 7, and 10, then stop
compressor.
c. Turn on pumpout condenser water.
d. Open valves 3 and 4, and place valves in the fol-
lowing positions:
e. Run the pumpout compressor until the chiller pres-
sure reaches 35 psig (241 kPa), followed by turn-
ing off the pumpout compressor. Warm chiller
condenser water will boil off any entrapped liquid
refrigerant, and chiller pressure will rise.
f. When chiller pressure rises to 40 psig (276 kPa),
turn on the pumpout compressor until the pressure
reaches 35 psig (241 kPa) again; then turn off the
pumpout compressor. Repeat this process until the
chiller pressure no longer rises.
g. Start the chiller water pumps (condenser and
cooler), establishing water flow. At this point, turn
on the pumpout compressor in auto until the vac-
uum switch is satisfied. This occurs at approxi-
mately 15 in Hg vacuum (48 kPa absolute or
7 psia).
h. Close valves.
i. Turn off the pumpout condenser water.
Chillers With Isolation Valves — In the Valve/Condition ta-
bles that accompany these instructions, the letter “C” indicates
a closed valve.
The valves referred to in the following instructions are
shown in Fig. 9 and 11. The cooler/condenser vessels can be
used for refrigerant 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 con-
denser water supply (if applicable). It is assumed
that the starting point is as shown in the following
table and that pressures in both vessels are above
35 psig (241 kPa).
b. Keeping valves 7 and 8 closed, install charging
hose from liquid line charging valve 7 to valve 8
on the condenser float chamber. Evacuate or purge
hose of non-condensables. Note that this creates a
flow path between cooler and condenser that
bypasses the linear float, reducing the potential for
damage during refrigerant transfer.
c. Open valves 1A, 1B, 2, 5, and 8.
d. Turn on pumpout compressor, generating a refrig-
erant pressure differential of 10 to 20 psi (69 to
138 kPa) to push liquid out of the chiller cooler
vessel.
e. Slowly open valve 7 to allow liquid transfer. Rapid
opening of valve 7 can result in float valve dam-
age.
f. When all liquid has been pushed into the chiller
condenser vessel, close valve 8.
g. Turn off the pumpout compressor.
h. Close pumpout valves 2 and 5 while opening valve
3 and 4 to prepare for removal of remaining refrig-
erant vapor in cooler vessel.
i. Turn on pumpout condenser water.
j. 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 when-
ever 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 cooler pres-
sure 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 longer rises.
l. Run pumpout unit in auto until the vacuum switch
is satisfied; this occurs at approximately 15 in. Hg
vacuum (48 kPa absolute or 7 psia). Close valve
1A.
m. Monitor that cooler pressure does not rise (if it
does, then repeat previous step).
n. With service valve 1A closed, shut down pumpout
compressor (if still running).
o. Close remaining valves.
p. Remove charging hose between 7 and 8 (evacuate
prior to removal).
q. Turn off pumpout condenser water.
r. Turn off chiller water pumps, and lockout chiller
compressor.
Transfer Refrigerant from Condenser to Cooler
a. Turn off chiller water pumps and pumpout con-
denser water supply (if applicable). It is assumed
that the starting point is as shown in the following
VALVE
1A 1B
2
3
4
5
6
7
8
10
11
CONDITION
C
C
C
VALVE
1A 1B
2
3
4
5
6
7
8
10
11
CONDITION
C
C
C
VALVE
1A 1B
2
3
4
5
6
7
8
10
11
CONDITION
C
C
C
C
C
C
C
VALVE
1A 1B
2
3
4
5
6
7
8
10
11
CONDITION
C
C
C
C
C
VALVE
1A 1B
2
3
4
5
6
7
8
10
11
CONDITION
C
C
C
C
C
C
C
C
C
C
VALVE
1A
1B
2
3
4
5
7
8
11
CONDITION
C
C
C
C
C
C
C
C
C
VALVE
1A
1B
2
3
4
5
7
8
11
CONDITION
C
C
C
C
VALVE
1A
1B
2
3
4
5
7
8
11
CONDITION
C
C
C
C
VALVE
1A
1B
2
3
4
5
7
8
11
CONDITION
C
C
C
C
VALVE
1A
1B
2
3
4
5
7
8
11
CONDITION
C
C
C
C
C
VALVE
1A
1B
2
3
4
5
7
8
11
CONDITION
C
C
C
C
C
C
C
C
C
Содержание 19XR Series
Страница 19: ......
