English
5
(4) Check the unit is horizontally level.
CAUTION
Use a level to make sure that the unit is level and that
the tilt (downward slope) to the drain piping connection
is within 1°. (Refer to Fig. 5)
(One thing to watch out for in particular is if it is installed so
that the slope is not in the direction of the drain piping, as
this might cause leaking.)
(5) Tighten the upper nut.
(6) Attach the accessory duct connecting flanges using
the included screws to the outlet and intake holes
(a total of four).
When attaching, make sure the alignment markings on the
unit match up with the triangle on the each duct connecting
flange.
(Refer to Fig. 6)
6
DRAIN PIPING AND WATER SUPPLY
WORK
(1) Install the drain piping.
•
Make sure the drain works properly.
•
In case of the direct duct connection system,
there is negative pressure inside the unit relative to atmo-
spheric pressure when the unit is running, so be sure to
provide drain frap on the drain outlet. (See Fig. 7-1)
CAUTION
Do not connect the drain piping directly to sewage pipes
that smell of ammonia. The ammonia in the sewage might
enter the indoor unit through the drain pipes and corrode
the heat exchanger (Direct expantion coil).
•
Keep the drain pipe short and sloping downwards at a
gradient of at least 1/100 to prevent air pockets from
forming.
(Refer to Fig. 7-2)
•
If converging multiple drain pipes, install according to the
procedure shown below. (Install a drain trap for each
indoor unit.)
CAUTION
Water accumulating in the drain piping can cause the
drain to clog.
•
The diameter of the drain pipe should be greater than or
equal to the diameter of the connecting pipe.
(pipe size: PT3/4B)
•
When piping passes indoors, always insulate it all the
way to the base of the drain socket.
•
In areas where freezing may occur, always take steps to
prevent the pipes from freezing.
•
Make sure water doesn’t leak from the drain pipes.
•
Avoid bends and curves in the pipes to prevent them
getting clogged.
•
If you are using central drain piping, follow the procedure
outlined in the figure 7-2.
•
Select central drain pipes of proper size according to the
capacity of the connected unit.
•
Make sure the tip of the drain pipes opens out into a loca-
tion where the drainage can be safely processed.
(2) After piping work is finished, check drainage flows
smoothly.
•
Test the drainage by pouring around 1000cc of water into
the drain pan through the inspection hole by removing the
maintenance cover (10 screws) or through the outlet duct
joint of supply air to room (SA).
(Refer to Fig. 8)
(3) Make sure that heat insulation work is executed on the
following 2 spots to prevent any possibility water leak-
age due to dew condensation.
• Indoor drain piping
• Drain outlet
Level
Level
Drain hole
Horizontal line
Drain hole
Dact connecting
flange
1
0
or
less
1
0
or
less
Fig. 5
Fig. 6
Duct connecting flange marking
Screws (accessory)
(6pcs.×4, total 24pcs.)
(RA is a
φ
3 indentation)
Duct connecting flange
Duct connecting
flange
Unit alignment
Attached drain hose
Bottom of unit
50 mm
or more
50 mm
or more
Fig. 7-1
100mm
or more
Fig. 7-2
Central drain piping
(Install with a downward slope of at least 1/100)
Maintenance cover
Bucket
Portable pump
(Locally procured)
(Figure shows VKM-GMV1)
(Locally procured)
(Locally procured)
Duct connecting flange
Supply air to room (SA)
(accessory)
Drain piping
Drain outlet
Fig. 8
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