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Field Piping and Wiring
Si21-205
36
Field Piping and Wiring
Not recommendable but in case of emergency
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.
After the work is finished, make sure to check that there is no gas leak.
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:
Caution
CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
“
Do not use flux when brazing refrigerant piping. Therefore, use the phosphor copper brazing
filter metal (BCuP) which does not require flux.
”
(Flux has extremely harmful influence on refrigerant piping systems. For instance, if the chlorine
based flux is used, it will cause pipe corrosion or, in particular, if the flux contains fluorine, it will
damage the refrigerant oil.)
•
Before brazing local refrigerant piping, nitrogen gas shall be blown through the piping to
expel air from the piping.
If your brazing is done without nitrogen gas blowing, a large amount of oxide film develops
inside the piping, and could cause system malfunction.
•
When brazing the refrigerant piping, only begin brazing after having carried out nitrogen
substitution or while inserting nitrogen into the refrigerant piping. Once this is done, connect
the indoor unit with a flared or a flanged connection.
•
Nitrogen should be set to 0.02 Mpa (0.2 kg/cm
2
) with a pressure-reducing valve if brazing
while inserting nitrogen into the piping. (Refer to Fig.15)
Pipe size
Further tightening angle
Recommended arm length of tool
φ
6.4 (1/4")
60 to 90 degrees
Approx. 150mm
φ
9.5 (3/8")
60 to 90 degrees
Approx. 200mm
φ
12.7 (1/2")
30 to 60 degrees
Approx. 250mm
Fig. 15
Summary of Contents for Sky Air B-Series R-410A
Page 7: ...Si21 205 vi Table of Contents ...
Page 15: ...Models Si21 205 4 Model Name and Power Supply ...
Page 16: ...Si21 205 Functions 5 Part 2 Functions 1 List of Functions 6 ...
Page 35: ...Wireless Remote Controller Si21 205 24 Remote Controller ...
Page 79: ...Settings Concerning Maintenance Si21 205 68 Field Setting Detail of PCB 2 ...
Page 83: ...Maintenance Mode Setting Si21 205 72 Field Setting ...
Page 239: ...Troubleshooting for Outdoor Unit 50 60 class Si21 205 228 Troubleshooting ...
Page 321: ...Outdoor Unit 50 60 class Si21 205 310 Removal Procedure ...