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Carrier AquaEdge 19DV series Start-Up, Operation And Maintenance Instructions Manual page 40

Two-stage back-to-back centrifugal liquid chillers with pic5 controls and hfo r-1233zd(e) 50/60 hz
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d. Turn off the pumpout compressor.
VALVE
1A
1B
2
CONDITION
O
O
C
e. To prepare for removal of remaining refrigerant
vapor in storage tank, close pumpout valves 3 and
4 and open valves 2 and 5.
VALVE
1A
1B
2
CONDITION
O
O
O
f. Turn on the pumpout condenser water.
g. Run pumpout unit in auto until the vacuum switch
is satisfied. This occurs approximately at 15 in. Hg
vacuum (48 kPa absolute or 7 psia), removing the
residual refrigerant vapor from the recovery tank
and condensing the a liquid in the chiller. Close
valves 1a, 1b, 2, 5, 6.
VALVE
1A
1B
2
CONDITION
C
C
C
h. Turn off pumpout condenser water.
Transfer Refrigerant from to Chiller from Storage Tank Vessel
1. Equalize refrigerant pressure. Ensure to run pumps if sat-
urated refrigerant temperature is near the freezing point to
avoid potential tube freeze up.
a. Dehydrate the refrigerant storage vessel, and con-
nected hoses/piping so there are no non-condens-
ables mixed with the refrigerant.
b. Open (O) and close (C) pumpout and storage tank
valves according to below table.
VALVE
1A
1B
2
CONDITION
O
O
C
c. Gradually open valve 5 to allow vapor pressure to
equalize between chiller system and storage tank,
open valve 7 and 10 to allow liquid refrigerant to
drain by gravity.
VALVE
1A
1B
2
CONDITION
O
O
C
2. Push remaining liquid, followed by refrigerant vapor re-
moval from chiller. Open valve 7 and 10 to prepare to let
higher pressure in the recovery tank push liquid refriger-
ant into the chiller through the cooler charging/vacuum
valve.
a. To prepare for liquid push, turn off the pumpout
condenser water. Place valves in the following
positions.
VALVE
1A
1B
2
CONDITION
O
O
O
b. Run the pumpout compressor in manual until all
liquid is pushed out of the chiller (approximately
45 minutes). To drain remaining liquid in HS and
LS float chambers refrigerant hoses can be con-
nected to valve 8 and 9 and this liquid can be
drained (or pushed) to the storage tank prior to
next step. Close valves 2, 5, 7 and 10, then stop
compressor.
VALVE
1A
1B
2
CONDITION
O
O
C
c. Turn on pumpout condenser water.
3
4
5
6
7
8
9
10
O
O
C
O
C
C
C
3
4
5
6
7
8
9
10
C
C
O
O
C
C
C
3
4
5
6
7
8
9
10
C
C
C
C
C
C
C
3
4
5
6
7
8
9
10
O
C
C
O
C
C
C
3
4
5
6
7
8
9
10
O
C
C
O
O
C
C
3
4
5
6
7
8
9
10
C
C
O
O
O
C
C
3
4
5
6
7
8
9
10
C
C
C
O
C
C
C
d. Open valves 3 and 4, and place valves in the fol-
lowing positions.
VALVE
C
CONDITION
e. Run the pumpout compressor until the chiller pres-
sure reaches -7.5 psig (49.5 kPa abs), followed by
turning off the pumpout compressor. Note it is pos-
sible that the pressure switch is satisfied before this
condition. Warm chiller condenser water will boil
C
off any entrapped liquid refrigerant, and chiller
pressure will rise.
f. When chiller pressure increases to -5.5 psig
(63 kPa abs) turn on the pumpout compressor until
the pressure reaches 7.5 psig (49.5 kPa abs) 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), establish water flow. At this point turn on
the pumpout compressor in auto until the vacuum
C
switch is satisfied. This occurs at approximately
15 in. Hg vacuum (48 kPa abs, 7 psia).
h. Close all valves.
VALVE
CONDITION
i. Turn off the pumpout condenser water.
DISTILLING THE REFRIGERANT
1. Transfer the refrigerant from the chiller to the pumpout
storage tank as described in the Transfer the Refrigerant
from Chiller to Pumpout Storage Tank section.
2. Equalize the refrigerant pressure
a. Turn on chiller water pumps and monitor chiller
C
pressures.
b. Close pumpout and storage tank valves 2, 4, 5, 7
and 10. Open any isolation valves; if present. Open
pumpout and storage tank valves 3 and 6; open
chiller valves 1a and 1b.
VALVE
O
CONDITION
c. Gradually crack open valve 5 to increase chiller
pressure to -7.5 psig (49.5 kPa abs). Slowly feed
refrigerant to prevent freeze-up.
d. Open valve 5 fully after the chiller pressure rises
above the freezing point. Let the storage tank and
chiller pressure equalize.
3. Transfer remaining refrigerant.
a. Set valves as per below table and turn on the pumpout
condenser water.
O
VALVE
CONDITION
b. Run the pumpout compressor until all refrigerant is
removed from the storage tank (remaining content
in tank is non-condensables).
c. Turn off the pumpout compressor, close all valves
and turn off the pumpout condenser water.
VALVE
CONDITION
C
4. Drain the contaminants from the bottom of the storage
tank into a container and dispose of it safely.
40
1A
1B
2
3
4
5
6
O
O
C
O
O
C
O
1A
1B
2
3
4
5
6
C
C
C
C
C
C
C
1A
1B
2
3
4
5
6
O
O
C
O
C
C
O
1A
1B
2
3
4
5
6
O
O
O
C
C
O
O
1A
1B
2
3
4
5
6
C
C
C
C
C
C
C
7
8
9
10
C
C
C
C
7
8
9
10
C
C
C
C
7
8
9
10
C
C
C
C
7
8
9
10
C
C
C
C
7
8
9
10
C
C
C
C

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