Si39-303
Installation Manual
175
6.4
Leak test
and
Vacuum Drying
The units were checked for leaks by the manufacturer.
Confirm that the valves are firmly closed before pressure test or vacuuming.
To prevent entry of any impurities and insure sufficient pressure resistance, always use the
special tools dedicated for R410A.
Air tight test and vacuum drying
!
Air tight test: Make sure to use nitrogen gas.
(For the service port location, refer to the “Caution” label attached on the front panel [right] of
the outdoor unit.)
Pressurize the liquid and gas pipes to 3.8MPa (38bar) (do not pressurize more than 3.8MPa
(38bar)). If the pressure does not drop within 24 hours, the system passes the test. If the
pressure drops, check where the nitrogen leaks from.
!
Vacuum drying: Use a vacuum pump which can evacuate to –100.7kPa (5Torr, –
755mmHg).
1. Evacuate the system from the liquid and gas pipes by using a vacuum pump for more
than 2 hours and bring the system to
–100.7kPa. After keeping the system under that condition for more than 1 hour, check if
the vacuum gauge rises or not. If it rises, the system may either contain moisture inside or
have leaks.
2. Following should be executed if there is a possibility of moisture remaining inside the pipe
(if piping work is carried out during the raining season or over a long period of time
rainwater may enter the pipe during work).
After evacuating the system for 2 hours, pressurize the system to 0.05MPa (vacuum
break) with nitrogen gas and evacuate the system again using the vacuum pump for 1
hour to
–100.7kPa (vacuum drying). If the system cannot be evacuated to –100.7kPa within 2
hours, repeat the operation of vacuum break and vacuum drying.
Then, after leaving the system in vacuum for 1 hour, confirm that the vacuum gauge does
not rise.
Notes:
Make sure to perform airtightness test and vacuum drying using the service ports of the shutoff
valve shown in the table on the bellow.
Shutoff valve operation procedure
Introduction
Confirm the sizes of the shutoff valves connected to the system referring to the table on the
below.
1.
[Service precautions]
Label location
2.
Electric box lid
3.
[Caution]
Label location
1
3
2
One outdoor unit installed: In case of
RXYQ5-16MY1B
Liquid line shutoff valve
Gas line shutoff valve
When multiple outdoor units installed:
In case of RXYQ18-48MY1B
Liquid line shutoff valve
Gas line shutoff valve
Oil-equalizing line shutoff valve
Q5 type
Q8 type
Q10 type Q12 type Q14 type Q16 type
Liquid line
shutoff valve
φ
9.5
φ
12.7
Gas line
shutoff valve
φ
15.9
φ
22.2
(The model Q8
supports onsite
piping of
φ
19.1 by the
accessory pipes)
φ
25.4
(The model Q12·14·16 supports
onsite piping of
φ
28.6 by the
accessory pipes)
Summary of Contents for VRV II Series
Page 6: ...Si39 303 iv Table of Contents...
Page 31: ...Si39 303 Installation General Information 25 Flaring Procedure...
Page 124: ...Appendix Si39 303 118 General Information 3P114237A...
Page 141: ...Si39 303 Appendix General Information 135 RXYQ8MY1B RXYQ10MY1B RXYQ12MY1B 4D040338A...
Page 142: ...Appendix Si39 303 136 General Information RXYQ14MY1B RXYQ16MY1B 4D040339A...
Page 144: ...Appendix Si39 303 138 General Information 7 11 Wiring Diagrams 7 11 1 Outdoor Unit RXYQ5MY1B...
Page 145: ...Si39 303 Appendix General Information 139 RXYQ8MY1B RXYQ10MY1B RXYQ12MY1B 3D038582...
Page 146: ...Appendix Si39 303 140 General Information RXYQ14MY1B RXYQ16MY1B 3D038058...
Page 147: ...Si39 303 Appendix General Information 141 7 11 2 Field Wiring RXYQ5 16MY1B 3D040746...
Page 148: ...Appendix Si39 303 142 General Information RXYQ18 32MY1B 3D040747...
Page 149: ...Si39 303 Appendix General Information 143 RXYQ34 48MY1B 3D040748...
Page 158: ...Appendix Si39 303 152 General Information...
Page 180: ...Refrigerant Piping Si39 303 174 Installation Manual...
Page 226: ...Troubleshooting Si39 303 220 Operation Manual...