General Maintenance; Refrigerant Properties - Carrier AquaEdge 19XR Start-Up, Operation And Maintenance Instructions Manual

h. Turn off the pumpout compressor.
2. Evacuate gas from chiller cooler vessel.
a. Close liquid line service valves 2 and 5; open valves 3
and 4.
VALVE 1A
CONDITION
b. Turn on pumpout condenser water.
c. Run pumpout compressor until the chiller cooler ves-
sel pressure reaches 18 in. Hg vacuum (41 kPa abso-
lute). Monitor pressures on the chiller control panel
and on refrigerant gages. This operation can be done
in Automatic or On mode. In Automatic mode, the
compressor will stop automatically at approximately
15 in. Hg vacuum (51 kPa absolute).
d. Close valve 1a.
e. Turn off pumpout compressor.
f. Close valves 1b, 3, and 4.
VALVE 1A
CONDITION C
g. Turn off pumpout condenser water.
h. Turn off chiller water pumps and lock out chiller com-
pressor.
Transfer All Refrigerant to Chiller Cooler Vessel
1. Push refrigerant into the chiller cooler vessel.
a. Turn on the chiller water pumps and monitor the
chiller pressure.
b. Valve positions:
VALVE 1A
CONDITION
c. Equalize refrigerant in the chiller cooler and condenser.
d. Turn off chiller water pumps and pumpout condenser
water.
e. Turn on pumpout compressor to push refrigerant out
of the chiller condenser.
f. When all liquid is out of the chiller condenser, close
valve 11 and any other liquid isolation valves on the
chiller.
g. Turn off the pumpout compressor.
2. Evacuate gas from chiller condenser vessel.
a. Turn on chiller water pumps.
b. Make sure that liquid line service valves 3 and 4 are
closed and valves 2 and 5 are open.
VALVE 1A
CONDITION
c. Turn on pumpout condenser water.
d. Run the pumpout compressor until the chiller con-
denser reaches 18 in. Hg vacuum (41 kPa absolute) in
Manual or Automatic mode. Monitor pressure at the
chiller control panel and refrigerant gages.
e. Close valve 1b.
f. Turn off pumpout compressor.
g. Close valves 1a, 2, and 5.
VALVE 1A
CONDITION C
h. Turn off pumpout condenser water.
i. Turn off chiller water pumps and lock out chiller com-
pressor.
Return Refrigerant to Normal Operating Conditions
1. Be sure that the chiller vessel that was opened has been
evacuated.
1B 2 3 4 5
C C
1B 2 3 4 5
C C C C C
1B 2 3 4 5
C C
1B 2 3 4 5
C C
1B 2 3 4 5
C C C C C
2. Turn on chiller water pumps.
3. Open valves 1a, 1b, and 3.
VALVE
CONDITION
4. Crack open valve 5, gradually increasing pressure in the
11
evacuated chiller vessel to 35 psig (241 kPa). Feed refrig-
C
erant slowly to prevent tube freeze-up.
5. Leak test to ensure chiller vessel integrity.
6. Open valve 5 fully.
VALVE
CONDITION
7. Close valves 1a, 1b, 3, and 5.
8. Open chiller isolation valve 11 and any other isolation
valves, if present.
VALVE
CONDITION
9. Turn off chiller water pumps.
11
DISTILLING THE REFRIGERANT
C
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 on page 35.
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, and
10, and close chiller charging valve 7; open chiller
isolation valve 11 and any other chiller isolation
valves, if present.
11
c. Open pumpout and storage tank valves 3 and 6; open
chiller valves 1a and 1b.
VALVE 1A
CONDITION
d. Gradually crack open valve 5 to increase chiller pres-
sure 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.
VALVE 1A
11
CONDITION
C
c. Turn on pumpout condenser water.
d. Run the pumpout compressor until the storage tank
pressure 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.
g. Turn off pumpout condenser water.
VALVE 1A
CONDITION
11
4. Drain the contaminants from the bottom of the storage
C
tank into a container. Dispose of contaminants safely.

GENERAL MAINTENANCE

Refrigerant Properties

The standard refrigerant for the 19XR chiller is HFC-134a.
At normal atmospheric pressure, HFC-134a will boil at –14°F
36
1A 1B 2 3
C
1A 1B 2 3
C
1A 1B 2 3
C C C C
1B 2 3 4 5
C C C
1B 2 3 4 5
C C
1B 2 3 4 5
C C C C C C
4 5 11
C C C
4 5 11
C C
4 5 11
C C
6 7 10 11
C C
6 7 10 11
C C
6 7 10 11
C C C