English
7
Table 4
7.
DRAIN PIPING WORK
Rig the drain pipe as shown below and take measures
against condensation. Improperly rigged piping could lead
to leaks and eventually wet furniture and belongings.
(1) Carry out the drain piping
• The diameter of the drain pipe should be greater than or
equal to the diameter of the connecting pipe (vinyl tube;
pipe size: 25 mm; outer dimension: 32 mm).
• Keep the drain pipe short and sloping downwards at a
gradient of at least 1/100 to prevent air pockets from
forming.
• If the drain hose cannot be sufficiently set on a slope, exe-
cute the drain raising piping.
• To keep the drain hose from sagging, space hanging
wires every 1 to 1.5 m.
CAUTION
Setting the unit at an angle opposite to the drain piping
might cause leaks.
• Use the drain hose and the metal clamp.
Insert the drain hose into the drain socket, up to the tape.
Tighten the clamp until the screw head is less than 4 mm
from the hose.
• Wrap the attached sealing pad over the clamp and drain
hose to insulate.
• Insulate the drain hose inside the building.
PRECAUTIONS FOR DRAIN RAISING PIPING
• Install the drain raising pipes at a height of less than
310 mm.
• Install the drain raising pipes at a right angle to the indoor
unit and no more than 300 mm from the unit.
•
If converging multiple drain pipes, install according to the
procedure shown below.
Select converging drain pipes whose gauge is suitable for
the operating capacity of the unit.
(2) After piping work is finished, check drainage flows
smoothly.
• Open the water inlet lid, add approximately 2.5 liter of
water gradually and check drainage flow.
[ WHEN ELECTRIC WIRING WORK IS FINISHED ]
• Check drainage flow during COOL running, explained under
“TEST OPERATION.”
Pipe size
Further tightening angle
Recommended arm length
of tool
6.4 (1/4”)
60 to 90 degrees
Approx. 150mm
9.5 (3/8”)
60 to 90 degrees
Approx. 200mm
12.7 (1/2”)
30 to 60 degrees
Approx. 250mm
15.9 (5/8”)
30 to 60 degrees
Approx. 300mm
1-1.5m
1-1.5m
Hanger bracket
Metal clamp
Drain hose
Tape
4mm
Large sealing pad
Metal clamp
(accessory)
(accessory)
Ceiling slab
600
mm
310mm)
290
mm
1-1.5m
300mm
Hanger bracket
Adjustable
Drain raising pipe
Drain hose (accessory)
Metal clamp (accessory)
T-joint converging drain pipes
100mm
Portable pump
Water inlet lid
Close
Open
Bucket
Refrigerant
piping
Water inlet
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