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19
English
You must use a torque wrench but if you are obliged to install the unit without a torque wrench, you may
follow the installation method mentioned below.
When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten the flare nut the angle shown below:
Precautions when brazing piping
Be sure to perform a nitrogen blow when brazing.
(Brazing without carrying out nitrogen replacement or releasing nitrogen into the piping will create large
quantities of oxidized film on the inside of the pipes, adversely affecting valves and compressors in the
refrigerating system and preventing normal operation.)
•
See the Installation manual (available at Daikin dealers) for details on how to perform nitrogen replacement.
•
When feeding nitrogen into the pipes while doing the brazing, the letdown valve should be set to 0.02MPa
(i.e. it should feel like a slight breeze if blown on your cheek).
CAUTION
Do not use anti-oxidants when brazing the pipe joints. (Residue can clog pipes and break equipment.)
7. EVACUATING
•
Perform a refrigerant leak check using nitrogen gas (airtightness test) with the outdoor unit stop valves
close, to make sure there are no leaks.
For the airtightness test, raise the pressure to the design pressure in the high pressure section. (4.0 MPa)
•
Do not forget to perform an air purge of the refrigerant system using a vacuum pump.
NOTE
•
After doing an air-purge with a vacuum pump, the refrigerant pressure may not rise even if the stop valve
is opened. This is because the refrigerant piping path is closed off by the outdoor unit electronic expansion
valve, etc.
There are no problems if the unit is run.
Pipe size
Further tightening angle
Recommended arm length of tool
φ
m
m
0
0
2
.
x
o
r
p
p
A
s
e
e
r
g
e
d
0
9
o
t
0
6
5
.
9
φ
m
m
0
0
3
.
x
o
r
p
p
A
s
e
e
r
g
e
d
0
6
o
t
0
3
9
.
5
1
Pressure-reducing valve
Hands valve
Taping
Refrigerant piping
Part to be brazed
Nitrogen
Nitrogen
Stop valve
Outdoor unit
Indoor unit
Nitrogen
Vacuum pump
Pressure
gauge
(Refrigerant leak check)
01_EN_3P281953-1B.fm Page 19 Tu esday, January 25, 2011 3:35 PM
Summary of Contents for RZQ20LCVAK
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Page 31: ...FBQ20EAVAK FBQ24EAVAK FBQ36EAVAK FBQ45EAVAK FBQ48EAVAK FBQ48EAVMK...
Page 32: ......
Page 33: ...R410A SUNISO R410A R410A R407C R410A R410A...
Page 34: ...R410A M5 16 24 20 48 45 36 M4 8...
Page 35: ...BRC1E62 BRC1D61 BRC1C61 BRC4C62 BRC4C64 FBQ48EAVMK BRC4C62...
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Page 38: ...M10 A 1 A 2 B D B C D 24 20 48 45 36...
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Page 91: ...English 30 MEMO...
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Page 95: ...3 1 1 1 2 3 4 5 R410A SUNISO R410A R410A 33 3 3 R407C 40 4 0 R410A R410A...
Page 96: ...4 2 1 2 48 2 2 1 1 2 1 2 3 1 3 3 71 PP 2 1...
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Page 103: ...11 4 2 1 3 1 B 1 2 40 D C 2 2 1 3 1 25 3 A 4 4 A D 5 4 4 4 1 3 2...
Page 104: ...12 100 M12 6 20 6 1 6 R410A BCuP 11 8 6...
Page 105: ...13 2 6 3 6 5 6 6 6 5 6 4 6 Suniso R407C R410A R410A 755 0 1...
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Page 111: ...19 Daikin 0 02 7 4 0 9 5 90 60 200 15 9 60 30 300...
Page 113: ...21 0 011 0 09 1 2 3 R410A 4 8 R410A RZQ 20 24 RZQ 36 45 RZ Q R 48...
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