
Si39-303
Installation
General Information
35
Special vacuum drying
This vacuum drying method is selected when there is a suspicion that there may be moisture in the pipes.
For example:
!
When moisture was discovered during the refrigerant pipe flushing operation
!
When there is a risk of condensation forming inside the pipes during periods of heavy rainfall
!
When there is a risk of condensation forming inside the pipes due to a long term of works
!
When there is a risk that rainwater may have entered the pipes during installation
The special vacuum drying method is the same as the standard method except that nitrogen is introduced
into the pipes to break the vacuum on one or more occasions during the course of the operation.
[Operational steps]
1. Vacuum drying (1st time): 2 hours
2. Vacuum breaking (1st time): Use nitrogen to raise pressure to +0.05MPa.
(Since the nitrogen gas used to break the vacuum is dry nitrogen this process serves only to enhance
the overall drying effect of the vacuum drying operation itself.
However, since the effectiveness of this process is severely impaired by a high moisture level inside the
pipes, the utmost care is required during installation to see that water does not enter or form inside the
refrigerant pipes.)
3. Vacuum drying (2nd time): Operate the vacuum pump for at least 1 hour.
(Observations: Degree of vacuum has reached 5 mmHg. If the degree of vacuum has not reached 5
mmHg after 2 hours or more then repeat the operations at 2 (vacuum breaking) and 3 (vacuum drying)
above.)
4. Carry out maintained vacuum test: 1 hour
5. Additional charge of refrigerant
6. Open stop valve to the full
∗
The gas used for the vacuum breaking operation must be nitrogen.
(The use of oxygen brings a serious risk of explosions)
Содержание VRV II Series
Страница 6: ...Si39 303 iv Table of Contents...
Страница 31: ...Si39 303 Installation General Information 25 Flaring Procedure...
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Страница 130: ...Appendix Si39 303 124 General Information BHFP22M135 Refer P 120 for Table 7 8 and 9 After connection piping...
Страница 140: ...Appendix Si39 303 134 General Information 7 10 Piping System Diagrams 7 10 1 Outdoor Unit RXYQ5MY1B...
Страница 141: ...Si39 303 Appendix General Information 135 RXYQ8MY1B RXYQ10MY1B RXYQ12MY1B 4D040338A...
Страница 142: ...Appendix Si39 303 136 General Information RXYQ14MY1B RXYQ16MY1B 4D040339A...
Страница 144: ...Appendix Si39 303 138 General Information 7 11 Wiring Diagrams 7 11 1 Outdoor Unit RXYQ5MY1B...
Страница 145: ...Si39 303 Appendix General Information 139 RXYQ8MY1B RXYQ10MY1B RXYQ12MY1B 3D038582...
Страница 146: ...Appendix Si39 303 140 General Information RXYQ14MY1B RXYQ16MY1B 3D038058...
Страница 147: ...Si39 303 Appendix General Information 141 7 11 2 Field Wiring RXYQ5 16MY1B 3D040746...
Страница 148: ...Appendix Si39 303 142 General Information RXYQ18 32MY1B 3D040747...
Страница 149: ...Si39 303 Appendix General Information 143 RXYQ34 48MY1B 3D040748...
Страница 158: ...Appendix Si39 303 152 General Information...
Страница 180: ...Refrigerant Piping Si39 303 174 Installation Manual...
Страница 226: ...Troubleshooting Si39 303 220 Operation Manual...