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Carrier AquaEdge 19DV Series Start-Up, Operation And Maintenance Instructions Manual page 41

Two-stage back-to-back centrifugal liquid chillers with pic6 controls and hfo r-1233zd(e) 50/60 hz
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d. Turn off the pumpout compressor.
VALVE
1A
1B
CONDITION
O
O
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
CONDITION
O
O
f. Turn on the pumpout condenser water.
g. Run pumpout unit in auto until the vacuum switch is sat-
isfied. This occurs approximately at 15 in. Hg vacuum
(48 kPa absolute or 7 psia), removing the residual refrig-
erant vapor from the recovery tank and condensing the a
liquid in the chiller. Close valves 1a, 1b, 2, 5, 6.
VALVE
1A
1B
CONDITION
C
C
h. Turn off pumpout condenser water.
Transfer Refrigerant from Chiller to Storage Tank Vessel
1.
Equalize refrigerant pressure. Be sure 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-condensables
mixed with the refrigerant.
b. Open (O) and close (C) pumpout and storage tank
valves according to below table.
VALVE
1A
1B
CONDITION
O
O
c. Gradually open valve 5 to allow vapor pressure to equal-
ize between chiller system and storage tank, and open
valve 7 and 10 to allow liquid refrigerant to drain by
gravity.
VALVE
1A
1B
CONDITION
O
O
2.
Push remaining liquid, followed by refrigerant vapor removal
from chiller. Open valve 7 and 10 to prepare to let higher
pressure in the recovery tank push liquid refrigerant into the
chiller through the evaporator charging/vacuum valve.
a. To prepare for liquid push, turn off the pumpout con-
denser water. Place valves in the following positions.
VALVE
1A
1B
CONDITION
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 connected 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
CONDITION
O
O
c. Turn on pumpout condenser water.
d. Open valves 3 and 4, and place valves in the follow-
ing positions.
VALVE
1A
1B
CONDITION
O
O
2
3
4
5
6
7
8
C
O
O
C
O
C
C
2
3
4
5
6
7
8
O
C
C
O
O
C
C
2
3
4
5
6
7
8
C
C
C
C
C
C
C
2
3
4
5
6
7
8
C
O
C
C
O
C
C
2
3
4
5
6
7
8
C
O
C
C
O
O
C
2
3
4
5
6
7
8
O
C
C
O
O
O
C
2
3
4
5
6
7
8
C
C
C
C
O
C
C
2
3
4
5
6
7
8
C
O
O
C
O
C
C
e. Run the pumpout compressor until the chiller pressure
reaches –7.5 psig (49.5 kPa abs), followed by turning
9
10
off the pumpout compressor. Note it is possible that the
C
C
pressure switch is satisfied before this condition. Warm
chiller condenser water will boil off any entrapped liq-
uid 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 pres-
9
10
sure reaches 7.5 psig (49.5 kPa abs) again; then turn
C
C
off the pumpout compressor. Repeat this process until
the chiller pressure no longer rises.
g. Start the chiller water pumps (condenser and evapora-
tor), establish water flow. At this point turn on the
pumpout compressor in auto until the vacuum switch
is satisfied. This occurs at approximately 15 in. Hg
vacuum (48 kPa abs, 7 psia).
h. Close all valves.
9
10
VALVE
C
C
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 Refrigerant from
Chiller to Storage Tank Vessel section.
2.
Equalize the refrigerant pressure
a. Turn on chiller water pumps and monitor chiller
pressures.
b. Close pumpout and storage tank valves 2, 4, 5, 7 and
10. Open any isolation valves, if present. Open pum-
9
10
pout and storage tank valves 3 and 6; open chiller
C
C
valves 1a and 1b.
VALVE
CONDITION
c. Gradually crack open valve 5 to increase chiller pres-
sure to –7.5 psig (49.5 kPa abs). Slowly feed refriger-
9
10
ant to prevent freeze-up.
C
O
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.
e. Set valves as per below table and turn on the pumpout
condenser water.
VALVE
9
10
CONDITION
C
O
f. Run the pumpout compressor until all refrigerant is
removed from the storage tank (remaining content in
tank is non-condensables).
g. Turn off the pumpout compressor, close all valves,
and turn off the pumpout condenser water.
VALVE
CONDITION
4.
Drain the contaminants from the bottom of the storage
9
10
tank into a container and dispose of it safely.
C
C
9
10
C
C
41
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

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