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7. DRAIN PIPING WORK
(1) Carry out drain piping.
Carry out drain piping so that drainage is ensured.
• Select the piping diameter equal to or larger than
(except for riser) that of the connection piping
(polyvi nyl chloride piping, nominal diameter 1 inch
(25mm), outside diameter 1-1/4 inch (32mm)).
• Install the drain piping as short as possible with
downward inclination of 1/100 or more and without such
that air may not stagnate. (Refer to Fig. 12) (It may
cause abnormal sound such as bubbling noise.)
Downward
inclination of
1/100 or more
40-60 inch
(1000-1500mm)
Support
Good
Wrong
Fig. 12
CAUTION
If drain stagnates in the drain piping, the piping may be
clogged.
• Ifsufcientdownwardinclinationcannotbeensured,
carry out upward drain piping.
• Install supports at a distance of 40 to 60 inch (1000 to
1500mm)sothatthepipingmaynotdeect.(Refer to
Fig. 12)
• Make sure to use the attached drain hose (2) and the
clamp metal (1).
Insert the drain hose (2) into the drain socket up to the
point where the socket diameter becomes larger.
Put the clamp metal (1) to the taped hose end and
tightentheclampmetal(1)withtorque10.6~13.3lbf•ft
(120~150N· cm).
Clamp metal (1)
Tape
Indoor unit
Drain hose (2)
Fig. 13
CAUTION
• Do not tighten the clamp metal (1) with the torque more
thanthespeciedvalue.
The drain hose (2), the socket or the clamp metal (1) may
be damaged.
• Wrap the vinyl tape around the end of the clamp metal
(1) so that the sealing pad (Large) (6) to be used at the
next process may not be damaged with the clamp end
or bend the tip of the clamp metal (1) inward as shown.
(Refer to Fig. 14)
<In case of sticking vinyl tape>
Tightened part
approx. 90°
Stick vinyl tape without
tearing the sealing pad
(Large) (6).
Vinyl tape
<In case of bending the tip>
Bend the tip without tearing the
sealing pad (Large) (6).
Tightened part
approx. 90°
Fig. 14
< Caution to be taken when carrying out upward drain
piping (Refer to Fig. 15) >
• The maximum height of the drain riser is 29-9/16 inch
(675mm). Since the drain pump mounted on this indoor
unit is a high head type, from the characteristic point of
view, the higher the drain riser the lower the draining
noise.
Therefore, the drain riser of 11-13/16 inch (300mm) or
higher is recommended.
• For upward drain piping, keep the horizontal piping
distance of 11-13/16 inch (300mm) or less between the
drain socket root to the drain riser.
Ceiling slab
11-13/16 (300) or less
40-60
(1000-1500)
Support
Clamp metal (1)
Drain hose (2)
Upward drain piping
(Field supply)
Adjustable
(26-9/16 (675) or less)
(33-7/16 (850)
or less)
Drain hose (2)
Level or upward
inclination
Keep the drain hose level or make a slight up-grade so
that air may not stagnate in the drain hose.
Ifairstagnates,thedrainmayowoppositelywhen
the drain pump stops and generate abnormal sound.
unit: inch (mm)
Fig. 15
9 English
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