6
Insert the drain hose completely. If it is not inserted properly,
or if it is twisted, water leakage may occur.
CORRECT
Drain Pipe
Connection
Drain Hose
(Accessory)
Twisted, incompletely insertion.
(Correct)
(Incorrect)
Drain Hose
(Accessory)
Twisted
Incompletely Insertion
Drain pipe
connection
Drain hose
(Accessory)
INCORRECT
Drain Pipe
Connection
Drain Hose
(Accessory)
Twisted, incompletely insertion.
(Correct)
(Incorrect)
Drain Hose
(Accessory)
Twisted
Incompletely Insertion
Drain hose
(Accessory)
Twisted
Incompletely insertion
Twisted, incompletely insertion
7
In case of raising the drain pipe, install it according to the
dimension shown in the figure below. The total drain piping
length of a+b+c shall be within 1100mm.
b
F
Ceiling
Drain hose
(accessory)
Support part
1 to 1.5m
(Max. 50mm, shorter
as possible)
1/25 to 1/100
Down-slope
a (Max. 300mm) Hose band (accessory)
Max. 850mm
8
Attach the factory-supplied hose clamp to the vinyl tape
(gray) attached to the drain hose. The hose clamp shall
be 20mm away from the end face of the drain hose. Then
tighten the hose clamp to make sure that it is approximately
28mm in length from the screw to the edge of the hose
clamp as shown:
20+5mm
Hose band (accessory)
Tightening torque: 3.0-3.5 N.m
Elbow or vinyl chloride VP25
(Field-supplied)
Drain hose (accessory)
Vinyl tape (gray)
Drain pipe connection
for checking drainage
(transparent)
Use vinyl chloride
type adhesive
Tightening torque: 3.0-3.5 N.m
Min. 28mm
Max. 300mm
?
N O T E
•
If connecting the factory-supplied drain hose to the drain pipe
connection without adhesive, for future relocation, follow the
procedure (6) and (8).
•
Use the factory-supplied drain hose and the hose clamp. Others may
cause water leakage.
•
Do not bend or twist the factory supplied drain hose. It will cause
water leakage.
•
Do not apply an excessive force to the drain pipe connection. It could
cause a damage.
On-site drain piping work
• Connect the factory-supplied drain hose to the drain pipe
connection using the polyvinyl chloride adhesive.
• When cleaning the connection surface, applying the
adhesive, inserting, retaining and curing the drain pipe, refer
to information given by the adhesive manufacturer.
• Install the support parts at an interval of 1m to 1.5m in order
not to bend the drain pipe.
• Install the drain hose horizontally or slightly on an upward
slope to prevent air pockets from forming inside it. If air
pockets form, the drain water will flow back into the unit,
which could cause an abnormal noise and leakage to the
room when the unit operation is stopped.
Drain Hose
Install the drain hose horizontally
or with an upward slope.
Install the drain hose horizontally or
with an upward slope.
Drain hose
Installing common drain pipe
• Install the common drain pipe on a downward slope to make
sure that it is lower than each rising part of the drain pipe
from the indoor unit.
• The pipe size of the common drain pipe must be larger
than VP30 (nominal diameter 30mm, outer diameter 38mm)
according to the number of the connected indoor units.
Example
This drain pipe shall
be separating from
other pipes
Vinyl Chloride Pipe (VP25)
Min. 100mm
(higher as possible)
1/25 to 1/100
downward slope
Common drain piping (Min. VP30)
(Downward slope from rising part)
Drain piping of unit side
?
N O T E
•
Do not provide an upward slope or a rising part for the drain pipe.
Otherwise, the drain water will flow back into the unit and it may
cause the water leakage when the unit operation is stopped.
Incorrect installation of drain piping
Rising part
Upward slope
•
Do not connect the drain pipe with sanitary or sewage pipe or any
other drainage pipe.
DRAIN PIPING
PMML0477 rev.0 - 07/2017
16
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