Check
SiUS331708EA
263
Service Diagnosis
5.7
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
(1) Vacuuming and dehydration
• 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.
(2) Leaving in vacuum state
• 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.)
(3) Additional refrigerant charge
• Purge air from the manifold gauge connection hoses, and then charge a necessary amount of
refrigerant.
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
• Follow the same procedure as that for Normal vacuuming and dehydration described above.
(2) Vacuum break
• Pressurize with nitrogen gas up to 0.05 MPa (7.3 psi).
(3) Vacuuming and dehydration
• 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.
(4) Leaving in vacuum state
• 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.
(5) Additional refrigerant charge
• Purge air from the manifold gauge connection hoses, and then charge a necessary amount of
refrigerant.
CHECK 8
Summary of Contents for RXSQ24TAVJU
Page 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
Page 290: ...Wiring Diagrams SiUS331708EA 277 Appendix RXSQ48TAVJU 3D109546A...
Page 291: ...SiUS331708EA Wiring Diagrams Appendix 278 RXSQ60TAVJU 3D109547A...
Page 295: ...SiUS331708EA Wiring Diagrams Appendix 282 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 298: ...Wiring Diagrams SiUS331708EA 285 Appendix FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 300: ...Wiring Diagrams SiUS331708EA 287 Appendix FXSQ05 07 09 12 15 18 24 30 36 48 54TAVJU 3D110467B...
Page 301: ...SiUS331708EA Wiring Diagrams Appendix 288 FXMQ07 09 12 15 18 24 30 36 48 54PBVJU 3D093209B...
Page 302: ...Wiring Diagrams SiUS331708EA 289 Appendix FXHQ12 24 36MVJU 3D048116C...
Page 303: ...SiUS331708EA Wiring Diagrams Appendix 290 FXAQ07 09 12 18 24PVJU 3D075354C...
Page 309: ...SiUS331708EA Wiring Diagrams Appendix 296 VAM1200GVJU 3D073270D...