Fujitsu AIRSTAGE V-II, Design & Technical Data

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PIPING CONNECTION 6636
663666 CAUTION OF PIPING
CAUTION
„ „
Keep the permissible length of every piping limitation to prevent a defect or cooling/heating
failure.
Piping material
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Use the designated size ( Diameter & thickness ) of refrigerant pipes. ●
Those pipes purchased locally may contain dust inside. Please blow out the dust by dried ●
inert gas when using.
To process the branch, do not use T-shaped pipe, which causes a uneven refrigerant flow. ●
Use the optionally available standard branch kit.
When replacing the unit, never use piping which has been used for previous installations. ●
Only use the new piping.
Piping process strage
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Be careful to avoid the dust or water falling into the pipe when performing piping process and ●
piping installation.
When processing the pipe, make the number of bending portion as few as possible, and the
●
bending radius as large as possible.
If the diameter of the required pipe is different from the branch unit, either cut it out or use the
●
reducer.
Brazing
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While Brazing the pipes, be sure to blow dry nitrogen gas through them. ●
If nitrogen gas is not blown through the pipes while they are being brazed, an oxidized layer ●
may form on the inside of the pipes. If this occurs, the cooling efficiency may decrease and
the air conditioner unit (compressor, valves, etc.) cause malfunction.
When brazing the pipes, do not use flux. If the flux is chlorine-based, the pipes will corrode ●
and when the flux contains fluorine, the refrigerant oil will deteriorate, etc. Using the flux has
an adverse affect on the refrigerant piping system.
For brazing materials, use phosphor copper solder that does not require flux.
●
Piping treatment
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The pipes vibrate, expand, and contract during operation, so if loads are concentrated in one ●
area, it could cause cracks in the pipes. Provide the pipe supports every 2 to 3m.
Make sure to insulate the refrigeration pipes separately with ample thickness of heat-resistant
●
polyethylene form etc. For the connecting portion, apply the enough insulation to avoid any
gap.
0.02MPa
Pressure hose
Rubber stopper
Bellows valve
Nitrogen gas
T-tube
Separation tube
Reducer
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SIGN
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