Vacuuming And Dehydration Procedure - Daikin SkyAir RZR-TA Series Service Manual

Check
5.7

Vacuuming and Dehydration Procedure

CHECK 8
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
1. Vacuuming and dehydration
2. Leaving in vacuum state
3. Additional refrigerant charge
Special vacuuming and dehydration
Use this procedure if moisture may get into the piping, such as construction during the rainy season
(dew condensation may occur, or rainwater may enter the piping during construction work).
1. Vacuuming and dehydration
2. Vacuum break
3. Vacuuming and dehydration
4. Leaving in vacuum state
5. Additional refrigerant charge
298
 Use a vacuum pump that enables vacuuming up to –100.7 kPa (–14.6 psi).
 Connect manifold gauges to the service ports of liquid pipe and gas pipe and run the
vacuum pump for a period of two or more hours to conduct evacuation to
–100.7 kPa (–14.6 psi) or less.
 If the degree of vacuum does not reach –100.7 kPa (–14.6 psi) or less even though
evacuation is conducted for a period of two hours, moisture will have entered the system or
refrigerant leakage will have been caused. In this case, conduct evacuation for a period of
another one hour.
 If the degree of vacuum does not reach –100.7 kPa (–14.6 psi) or less even though
evacuation is conducted for a period of three hours, conduct the leak tests.
 Leave the compressor at the degree of vacuum of –100.7 kPa (–14.6 psi) or less for a period
of one 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 amount
of refrigerant.
 Follow the same procedure as that for Normal vacuuming and dehydration described above.
 Pressurize with nitrogen gas up to 0.05 MPa (7.3 psi).
 Conduct vacuuming and dehydration for a period of one hour or more. If the degree of
vacuum does not reach –100.7 kPa (–14.6 psi) or less even though evacuation is conducted
for a period of two hours or more, repeat vacuum break - vacuuming and dehydration.
 Leave the compressor at the degree of vacuum of –100.7 kPa (–14.6 psi) or less for a period
of one 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 amount
of refrigerant.
SiUS281811EA
Part 6 Service Diagnosis