General Maintenance; Refrigerant Properties; Adding Refrigerant; Removing Refrigerant - Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual

p. Turn off pumpout condenser water.
q. Turn off chiller water pumps, and lock out chiller
compressor.
Return Chiller to Normal Operating Conditions
1. Vapor Pressure Equalization:
a. Ensure that the chiller vessel that was exposed to ambi-
ent has been evacuated. Final vacuum prior to charging
with refrigerant should in all cases be 29.9 in. Hg
(500 microns, 0.07 kPa [abs]) or less.
b. Turn on chiller water pumps.
c. Open valves 1A, 1B, and 2.
VALVE 1A 1B
CONDITION
d. Slowly open valve 4, gradually increasing pressure in the
evacuated vessel to 35 psig (241 kPa).
e. Leak test to ensure chiller vessel integrity.
f. Open valve 4 fully for cooler and condenser pressure
equalization (vapor equalization).
VALVE 1A 1B
CONDITION
g. Close valves 1A, 1B, 2, and 4.
VALVE 1A 1B
CONDITION C C
2. Liquid equalization:
a. Slowly open valve 11 and any other isolation valves
open for liquid drain.
VALVE 1A 1B
CONDITION C C
b. Turn off chiller water pumps.
Distilling the Refrigerant
1. Transfer the refrigerant from the chiller to the pumpout stor-
age 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 pres-
sures.
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.
c. Open pumpout and storage tank valves 3 and 6; open
chiller valves 1A and 1B.
VALVE 1A 1B
CONDITION C
d. Gradually crack open valve 5 to increase chiller pressure
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 1B
CONDITION
c. Turn on pumpout condenser water.
2 3 4 5 7
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2 3 4 5 7
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2 3 4 5 7
C C C C C
2 3 4 5 7
C C C C C
2 3 4 5 6 7 10
C C C C
2 3 4 5 6 7 10
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d. Run the pumpout compressor until the storage tank pres-
sure 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
CONDITION
Drain the contaminants from the bottom of the storage tank into a
container. Dispose of contaminants safely.
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C

Refrigerant Properties

R-134a and R-513A are the standard refrigerants in the 23XRV
chiller. At normal atmospheric pressure, R-134a will boil at –14°F
(–25°C) and R-513A will boil at –28°F (–33°C), and must, there-
fore, be kept in pressurized containers or storage tanks. The refrig-
erant is practically odorless when mixed with air. R-134a is non-
combustible at atmospheric pressure. Read the Material Safety
Data Sheet and the latest ASHRAE Safety Guide for Mechanical
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Refrigeration to learn more about safe handling of this refrigerant.
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R-134a will dissolve oil and some non-metallic materials, will
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dry the skin, and, in heavy concentrations, may displace
enough oxygen to cause asphyxiation. In handling this refrig-
erant, protect hands and eyes and avoid breathing fumes.

Adding Refrigerant

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Follow the procedures described in the Charge Refrigerant into
Chiller section, page 38.
Always use the compressor pumpdown function in the Con-
trol Test mode to turn on the evaporator pump and lock out the
compressor when transferring refrigerant. Liquid refrigerant
may flash into a gas and cause possible freeze-up when the
chiller pressure is below 35 psig (241 kPa).

Removing Refrigerant

If the optional pumpout system is used, the 23XRV refrigerant
charge may be transferred to a storage vessel or within the con-
denser or cooler if isolation valves are present. Follow procedures
in the Pumpout and Refrigerant Transfer Procedures section when
removing refrigerant from the storage tank to the chiller.
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Adjusting the Refrigerant Charge

If the addition or removal of refrigerant is required for improved
chiller performance, follow the procedures given under the Trim
Refrigerant Charge section, on page 53.

Refrigerant Leak Testing

Because R-134a/R-513A is above atmospheric pressure at room
temperature, leak testing can be performed with refrigerant in the
chiller. Use an electronic leak detector, halide leak detector, soap
bubble solution, or ultra-sonic leak detector. Be sure that the room
is well ventilated and free from concentration of refrigerant to
keep false readings to a minimum. Before making any necessary
repairs to a leak, transfer all refrigerant from the leaking vessel.
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The chiller should be leak tested at least once per year.
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1A 1B 2 3 4 5
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GENERAL MAINTENANCE

WARNING
CAUTION
6 7 10 11
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