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Si21-205
Field Piping and Wiring
Field Piping and Wiring
45
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 you 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. 12)
•
Make absolutely sure to execute heat insulation works on the pipe-connecting section after
checking gas leakage by thoroughly studying the following figure and using the attached
heat insulating materials for fitting (6) and (7). (Fasten both ends with the clamps (4).)
(Refer to Fig. 13)
•
Wrap the sealing pad (9) only around the insulation for the joints on the gas piping side.
(Refer to Fig. 13)
Caution
•
Be sure to insulate any field piping all the way to the piping connection inside the unit. Any
exposed piping may cause condensation or burns if touched.
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
φ
15.9 (5/8”)
30 to 60 degrees
Approx. 300mm
φ
19.1 (3/4”)
20 to 35 degrees
Approx. 450mm
Refrigerant piping
Part to be
brazed
Taping
Pressure-reducing valve
hands valve
Nitrogen
Nitrogen
Fig. 12
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 ...