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4.7
Oilretumbendsettings
Comectirg
io the sec@d stt of itrdool
uit!
Outdoor unit
(st)
OutdMuit(rd)
oil
Etm b6d
Com@ting
to the
list
set
of
hdoorunits
Fig.
4-7
Position of
Oil
ReturnBad
Jfrc
Eeight Direction
t
-{
-
t'ig,
4-8
position
of
Oil Return
Bend at the
Horizontal Direction
4.8
Remove
foreign
materials
in
the
pipeline.
1)
The
foreign
n{aterials,
whicb
enter the refrigerant pipe
during installation,
shall be cleaned
with
high pressure
nitrogen'
2)
Don't
connect
with
the
indoor unit
upon cleaning.
3)
Use the
nitogen
irstead ofrefrigerant
or flammable
toxic
gases
like
oxygen'
Air
tightness test
l)
After
the refriserant pipe
is
installed
and connected
to.
the indoor unit,
and
before
the-co-nne-cting
''
""*-J.ai"
ift"
rufi,"'. of
the outdoor units,
refill
the nitrogen
with
the
pressure
of
40kgflcttti
simultaneously,
mark
the pressure value,
and
then
perform 24-houf
afu
tightxess test.
2)
If
the pressure drops, recheck the leakage
of all
interfaces
and
then maintain the pressure
for
24 hours
3)
Don't
connect
witb
the outdoor
unit dudng maintaining
tbe presswe'
oioes
between the indoor
and
outdoor units
are
?+.oup") from
the
gas
side and the
fluid
side
4.9
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