15
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.
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.
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.
p. Turn off pumpout condenser water.
q. Turn off chiller water pumps, and lock out chiller com-
pressor.
Return Chiller to Normal Operating Conditions
1. Vapor Pressure Equalization:
a. Ensure that the chiller vessel that was exposed to ambi-
ent has been evacuated. Final vacuum prior to charging
with refrigerant should in all cases be 29.9 in. Hg
(500 microns, 0.07 kPa [abs]) or less.
b. Turn on chiller water pumps.
c. Open valves 1A, 1B, and 2.
d. Slowly open valve 4, gradually increasing pressure in the
evacuated vessel to 35 psig (241 kPa).
e. Leak test to ensure chiller vessel integrity.
f. Open valve 4 fully for cooler and condenser pressure
equalization (vapor equalization).
g. Close valves 1A, 1B, 2, and 4.
1. Liquid equalization:
a. If refrigerant is stored in cooler, install a charging hose
between valves 7 and 8, and open both the valves and
any other isolation valves (except valve 11) for liquid to
drain into the condenser while bypassing the linear float
valve. If refrigerant is stored in the condenser, keep valve
11 and any other isolation valves open for liquid drain.
b. If valves 7 and 8 were used to bypass the linear float
valve, once the liquid transfer is complete, close these
valves, and slowly open valve 11.
c. Turn off chiller water pumps.
Distilling the Refrigerant
1. Transfer the refrigerant from the chiller to the pumpout stor-
age tank as described in the Transfer Refrigerant from Chiller
to Storage Tank Vessel section.
2. Equalize the refrigerant pressure.
a. Turn on chiller water pumps and monitor chiller pres-
sures.
b. Close pumpout and storage tank valves 2, 4, 5, and 10,
and close chiller charging valve 7; open chiller isolation
valve 11 and any other chiller isolation valves, if present.
c. Open pumpout and storage tank valves 3 and 6; open
chiller valves 1a and 1b.
d. Gradually crack open valve 5 to increase chiller pressure
to 35 psig (241 kPa). Slowly feed refrigerant to prevent
freeze-up.
e. Open valve 5 fully after the chiller pressure rises above
the freezing point of the refrigerant. Let the storage tank
and chiller pressure equalize.
3. Transfer remaining refrigerant.
a. Close valve 3.
b. Open valve 2.
c. Turn on pumpout condenser water.
d. Run the pumpout compressor until the storage tank pres-
sure reaches 5 psig (34 kPa), 18 in. Hg vacuum (41 kPa
absolute) in Manual or Automatic mode.
e. Turn off the pumpout compressor.
f. Close valves 1a, 1b, 2, 5, and 6. Turn off pumpout con-
denser water.
4. Drain the contaminants from the bottom of the storage tank
into a container. Dispose of contaminants safely.
VALVE 1A1B23457811
CONDITION CC CCC
VALVE 1A1B23457811
CONDITION C C C C C C
VALVE 1A1B23457811
CONDITION CCCCCCCCC
VALVE 1A1B23457811
CONDITION CCCCCC
VALVE 1A1B23457811
CONDITION C CCCC
VALVE 1A1B23457811
CONDITION CCCCCCCCC
VALVE 1A1B23457811
CONDITION
(CHARGE IN
COOLER)
CCCCCC C
CONDITION
(CHARGE IN
CONDENSER)
CCCCCCCC
VALVE 1A1B2345671011
CONDITION CCCCC
VALVE 1A1B2345671011
CONDITION C C C C
VALVE 1A1B2345671011
CONDITION CCCCCCCCC
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