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

Chillers with Storage Tanks —
tion tables that accompany these instructions, the letter "C"
indicates a closed valve. Figures 40-43 and 53 show the
locations of the valves.
CAUTION
Always run chiller cooler and condenser water pumps and
always charge or transfer refrigerant as a gas when chiller
vessel pressure is less than 35 psig (241 kPa). Below these
pressures, 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. 53 —Optional Pumpout Unit
TRANSFER REFRIGERANT FROM PUMPOUT STOR-
AGE TANK TO CHILLER
WARNING
During transfer of refrigerant into and out of the 23XRV
storage 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 and monitor chiller
pressures.
b. Close pumpout and storage tank valves 2, 4, 5, and
10, and close refrigerant charging valve 7; open
chiller isolation valve 11 and any other chiller iso-
lation valves, if present.
c. Open pumpout and storage tank valves 3 and 6;
open chiller valves 1a and 1b.
VALVE 1A 1B 2
CONDITION C
d. Gradually crack open valve 5 to increase chiller
pressure to 35 psig (241 kPa). Slowly feed refriger-
ant 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. Open
refrigerant charging valve 7 and storage tank
In the Valve/Condi-
COMPRESSOR
OIL
HEATER
OIL FILL
FITTING
OIL
SEPARATOR
a23-1546
3 4 5 6 7 10 11
C C C C
charging valve 10 to let liquid refrigerant drain into
the chiller.
VALVE 1A 1B
CONDITION
2. Transfer remaining refrigerant.
a. Close valve 5 and open valve 4.
VALVE 1A 1B
CONDITION
b. Turn off the pumpout condenser water, and turn on
the pumpout compressor in manual mode to push
liquid refrigerant out of the storage tank. Monitor
the storage tank level until the tank is empty.
c. Close refrigerant charging valves 7 and 10.
d. Turn off the pumpout compressor.
e. Turn off the chiller water pumps.
f. Close valves 3 and 4.
g. Open valves 2 and 5.
VALVE 1A 1B
CONDITION
h. Turn on pumpout condenser water.
i. Run the pumpout compressor in manual mode until
the storage tank pressure reaches 5 psig (34 kPa),
18 in. Hg vacuum (41 kPa absolute).
j. Turn off the pumpout compressor.
k. Close valves 1a, 1b, 2, 5, and 6.
VALVE 1A 1B
CONDITION C C
l. Turn off pumpout condenser water.
TRANSFER THE REFRIGERANT FROM CHILLER TO
PUMPOUT STORAGE TANK
1. Equalize refrigerant pressure.
a. Valve positions:
VALVE 1A 1B
CONDITION
b. Slowly open valve 5 and refrigerant charging
valves 7 and 10 to allow liquid refrigerant to drain
by gravity into the storage tank.
VALVE 1A 1B
CONDITION
2. Transfer the remaining liquid.
a. Turn off pumpout condenser water. Place valves in
the following positions:
VALVE 1A 1B
CONDITION
b. Run the pumpout compressor in automatic mode
until vacuum switch is satisfied and compressor
stops. Close valves 7 and 10.
VALVE 1A 1B
CONDITION
c. Turn off the pumpout compressor.
3. Remove any remaining refrigerant.
a. Turn on chiller water pumps.
b. Turn on pumpout condenser water.
87
2 3 4 5 6 7 10
C C
2 3 4 5 6 7 10
C C
2 3 4 5 6 7 10
C C C C
2 3 4 5 6 7 10
C C C C C C C
2 3 4 5 6 7 10
C C C C C
2 3 4 5 6 7 10
C C
2 3 4 5 6 7 10
C C
2 3 4 5 6 7 10
C C C C
11
11
11
11
11
11
11
11