Chillers With Storage Tanks - Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual

Chillers with Storage Tanks

In the Valve/Condition tables that accompany these instructions,
the letter "C" indicates a closed valve. Figures 49-51 show the lo-
cations of the valves.
CAUTION
Always run chiller cooler and condenser water pumps and
always charge or transfer refrigerant as a gas when chiller ves-
sel pressure is less than 35 psig (241 kPa). Below these pres-
sures, liquid refrigerant flashes into gas, resulting in extremely
low temperatures in the cooler/condenser tubes and possibly
causing tube freeze-up.
FRAME
ASSEMBLY
CONTROL
PANEL
VALVE
2
VALVE
3
VALVE
4
VALVE
5
ENTERING
WATER
LEAVING
CONDENSER
WATER
Fig. 49 — Optional Pumpout Unit
FOR UNITS WITH Q AND R COMPRESSORS ONLY
Transfer Refrigerant from Pumpout Storage Tank to Chiller
WARNING
During transfer of refrigerant into and out of the 23XRV stor-
age tank, carefully monitor the storage tank level gage. Do not
fill the tank more than 90% of capacity to allow for refrigerant
expansion. Overfilling may result in damage to the tank and
personal injury.
1. Equalize refrigerant pressure.
a. Turn on chiller water pumps, establishing water flow
(assumes vacuum condition in chiller system).
b. Close pumpout and storage tank valves 2, 4, 5, 7, 8, 10
(if present open isolation valve 11 and other isolation
valves between cooler and condenser). Open storage
tank valves 6; open chiller valves 1A and 1B.
VALVE 1A 1B 2
CONDITION C
c. Gradually open valve 5 to slowly increase chiller pres-
sure to 35 psig (241 kPa) to reduce the potential of tube
freeze up.
d. Open valve 5 fully after the chiller pressure reaches
35 psig (241 kPa) or greater. Let chiller pressure reach
40 psig (276 kPa), then chiller water pumps can be
turned off. Fully close valve 5.
VALVE 1A 1B 2
CONDITION C
a23-1546
COMPRESSOR
OIL
HEATER
OIL FILL
FITTING
OIL
SEPARATOR
3 4 5 6 7 8 10 11
C C C C C
3 4 5 6 7 8 10 11
C C C C C
e. Open valve 8 and 10 to let higher pressure in the recov-
ery tank push liquid refrigerant into the condenser float
chamber and heat exchangers until the refrigerant pres-
sure equalizes between the recovery tank and chiller.
VALVE 1A 1B
CONDITION
2. Push liquid to chiller, them remove remaining vapor from
storage tank:
a. To prepare for liquid, push open valve 4.
VALVE 1A 1B
CONDITION
b. Ensure pumpout condenser water is off, then turn on the
pumpout compressor in manual mode to push liquid to
chiller. Monitor the storage tank level until tank is empty
of liquid refrigerant.
c. Close charging valves 8 and 10.
d. Turn off the pumpout compressor.
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
f. Turn on 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 to a
liquid in the chiller.
h. Close valves 1A, 1B, 2, 5, 6.
VALVE 1A 1B
CONDITION C C
i. Turn off pumpout condenser water.
Transfer Refrigerant from Chiller to Storage Tank Vessel
1. Equalize refrigerant pressure.
a. Dehydrate the refrigerant storage vessel, and connected
hoses/piping so there are no non-condensables mixed
with the refrigerant.
b. Locate valves as identified below:
VALVE 1A 1B
CONDITION
c. Slowly open valve 5 until the refrigerant pressure
reaches 35 psig (241 kPa) in the storage tank, followed
by valves 7 and 10 to allow liquid refrigerant to drain by
gravity.
VALVE 1A 1B
CONDITION
2. Push remaining liquid, followed by refrigerant vapor removal
from chiller.
a. To prepare for liquid push, turn off the pumpout con-
denser water. Place valves in the following positions:
VALVE 1A 1B
CONDITION
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.
VALVE 1A 1B
CONDITION
46
2 3 4 5 6 7 8
C C C C
2 3 4 5 6 7 8
C C C
2 3 4 5 6 7 8
C C C C
2 3 4 5 6 7 8
C C C C C C C
2 3 4 5 6 7 8
C C C C C
2 3 4 5 6 7 8
C C C
2 3 4 5 6 7 8
C C C
2 3 4 5 6 7 8
C C C C C C
10 11
10 11
10 11
C
10 11
C
10 11
C
10 11
10 11
10 11
C