Daikin GYEQ20AN Service Manual page 52

Installation Work Manual
Refrigerant piping work and connection
This section provides instructions to follow when performing refrigerant piping work.
Only use copper pipes that have clean inner surfaces (e.g. free of moisture and dust).
When you cut a refrigerant pipe, be sure to use a pipe cutter. Before connecting the pipes, flush them with
nitrogen gas to blow out any dust inside. Avoid using a saw, grindstone, or any other tool that generates a
large amount of chips. Connecting pipes with moisture or dust remaining on their inner surfaces could
possibly result in serious damage.
When passing the
piping through a
wall, be sure to
put a cap on the
pipe end or plastic
tape around it.
Put a cap on or plastic
tape around it.
Fit flare nuts on pipe ends before expanding the pipes. To connect
each flare nut, follow these steps: 1) Lubricate the outer
circumference of the flare with refrigerating machine oil equivalent
to an oil used for the outdoor unit's compressor; 2) Manually screw
in the flare nut by turning it 3 or 4 turns; 3) Tighten the flare nut
with the specified torque.
When you bend a pipe, make the bending radius as large as
possible. Do not repeatedly bend a pipe.
When you cut a pipe, use a copper cutter and cut the pipe with as
small a notch as possible so that no burr occurs inside the pipe.
When you chamfer the inner surface of a pipe after cutting it, use a
dedicated tool and deburr the cut surface.
When you flare the cut end, use a dedicated tool and flare it into
one of the sizes listed in the table on the right.
The stop valve that belongs to the outdoor unit and the flange
gasket of the external filter must not be installed until braze
welding is complete.
41
Do not put the
piping directly
on the ground.
No good
Through hole
Good
022613-00E
7 Installing the Outdoor Unit
Good
Put a cap on or plastic
tape around it.
No good
022614-00E
(outside diameter)
– 13 –
SiAUY361411EA
Cap or
vinyl bag
Rainwater
Rubber
gets inside
band
the piping
Good No good
022615-00E
Flare inner
surface
022616-01E
Flare shape
Do not use a flare connection
without O materials.
022617-00E
Pipe size
Flare dimension A (mm)
8.7 to 9.1
12.8 to 13.2
16.2 to 16.6
19.3 to 19.7
0FGHP-EN0801 DGJ002
Device Overview