Daikin VRV-WIII RWEYQ72PTJU Service Manual page 256

Troubleshooting by Indication on the Remote Controller
CHECK 8
Vacuuming and Dehydration Procedure
Conduct vacuuming and dehydration in the piping system following the procedure for <Normal
vacuuming and dehydration> described below.
Furthermore, if moisture may get mixed in the piping system, follow the procedure for <Special
vacuuming and dehydration> described below.
<Normal vacuuming and dehydration>
N Vacuuming and dehydration
O Leaving in vacuum state
P Refrigerant charge
<Special vacuuming and dehydration> - In case moisture may get mixed in the piping 
N Vacuuming and dehydration
O Vacuum break
P Vacuuming and dehydration
Q Leaving in vacuum state
R Refrigerant charge
 In case of construction during rainy reason, if dew condensation occurs in the piping due to
248
• Use a vacuum pump that enables vacuuming up to 14.60 psi (5 torr, -755 mmHg).
• Connect manifold gauges to the service ports of liquid pipe and gas pipe and run the vacuum
pump for a period of 2 or more hours to conduct evacuation to -14.60 psi or less.
• If the degree of vacuum does not reach -14.60 psi or less even though evacuation is
conducted for a period of 2 hours, moisture will have entered the system or refrigerant leakage
will have been caused. In this case, conduct evacuation for a period of another 1 hour.
• If the degree of vacuum does not reach -14.60 psi or less even though evacuation is
conducted for a period of 3 hours, conduct leak tests.
• Leave the compressor at the degree of vacuum of -14.60 psi or less for a period of 1 hour or
more, and then check to be sure that the vacuum gauge reading does not rise. (If the reading
rises, moisture may have remained in the system or refrigerant leakage may have been
caused.)
• Purge air from the manifold gauge connection hoses, and then charge a necessary quantity of
refrigerant.
• Follow the same procedure as that for 1) Normal vacuuming and dehydration described
above.
• Pressurize with nitrogen gas up to 7.25 psi.
• Conduct vacuuming and dehydration for a period of 1 hour or more. If the degree of vacuum
does not reach -14.60 psi or less even though evacuation is conducted for a period of 2 hours
or more, repeat vacuum break - vacuuming and dehydration.
• Leave the compressor at the degree of vacuum of -14.60 psi or less for a period of 1 hour or
more, and then check to be sure that the vacuum gauge reading does not rise.
• Purge air from the manifold gauge connection hoses, and then charge a necessary quantity of
refrigerant.
extended construction period, or rainwater or else may enter the piping during construction
work:
SiUS30-1301
Service Diagnosis