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English■
9
Indoor Unit Installation
5. Drain piping
1) Connect the drain hose, as described on the right.
2)
Remove the upper front panel and the air filters. (Refer to removal method on page 11.)
Pour some water into the drain pan to check the water flows smoothly.
3) If drain hose extension or embedded drain piping is required, use appropriate parts
that match the hose front end.
Figure of hose front end
• When drain hose requires extension, obtain an extension
hose with an inner diameter of 5/8 inch (16mm).
Be sure to thermally insulate the indoor section of the
extension hose.
• When connecting a rigid polyvinyl chloride pipe
(nominal diameter 1/2 inch (13mm)) directly to
the drain hose attached to the indoor unit as with
embedded piping work, use any commercially
available drain socket (nominal diameter 1/2 inch
(13mm)) as a joint.
Refrigerant Piping Work
WARNING
• Do not apply mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would reduce the service life of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Never install a dryer to this R410A unit in order to guarantee its service life.
• The drying material may dissolve and damage the system.
• Incomplete flaring may result in refrigerant gas leakage.
, install as described in the installation manual supplied with the multi outdoor unit.
1. Flaring the pipe end
1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing downward
so that the filings do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring has been done correctly.
The drain hose should
be inclined downward.
No trap is permitted.
Do not put the end
of the hose in water.
ϕ11/16”
(ϕ18mm)
ϕ5/8”
(ϕ16mm)
Indoor unit
drain hose
Extension drain hose
Heat insulation tube (field supply)
ϕ5/8”
(ϕ16mm)
Drain hose supplied
with the indoor unit
Commercially available
drain socket
(nominal diameter 1/2 inch
(13mm))
Commercially available
rigid polyvinyl chloride pipe
(nominal diameter 1/2 inch
(13mm))
Drain hose supplied with
the indoor unit
ϕ11/16”
(ϕ18mm)
With a multi indoor unit
A
A
Cut exactly at
right angles.
Remove burrs.
Flaring
Set exactly at the position shown below.
Die
0-0.020 inch
(0-0.5mm)
Clutch-type
Flare tool for
R410A
0.039-0.059 inch
(1.0-1.5mm)
Clutch-type
(Rigid-type)
0.059-0.079 inch
(1.5-2.0mm)
Wing-nut type
(Imperial-type)
Conventional flare tool
The flare's inner
surface must be
flaw-free.
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
Check
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