8
Fig. 5-1
5. Drainage piping work
5.1. Drainage piping work (Fig. 5-1)
• Drain pipes should have an inclination of 1/100 or more.
• For extension of the drain pipe, use a soft hose (inner dia. 15 mm, 19/32 inch)
available on the market or hard vinyl chloride pipe (VP-16 mm, 5/8 inch/O.D. ø22
mm, ø55/64 inch PVC TUBE). Make sure that there is no water leakage from the
connections.
• Do not put the drain piping directly in a drainage ditch where sulphuric gas may
be generated.
• When piping has been completed, check that water flows from the end of the
drain pipe.
Caution:
The drain pipe should be installed according to this Installation Manual to
ensure correct drainage. Thermal insulation of the drain pipes is necessary
to prevent condensation. If the drain pipes are not properly installed and
insulated, condensation may drip on the ceiling, floor or other possessions.
Inclined downwards
Must be lower than outlet point
Water leakage
Trapped drainage
Air
Wavy
The end of drain pipe is under water.
Drainage ditch
5 cm or less between the end of drain pipe and the ground.
Drain hose
Soft PVC hose (Inside diameter ø15 mm, 19/32 inch)
or
Hard PVC pipe (VP-16 mm, 5/8 inch)
* Bond with PVC type adhesive
Preparing left and left rear piping (Fig. 5-2)
Remove the drain cap.
• Remove the drain cap by holding the bit that sticks out at the end of the pipe and
pulling.
Drain cap
Remove the drain hose.
• Remove the drain hose by holding on to the base of the hose
/
(shown by
arrow) and pulling towards yourself
0
.
Insert the drain cap.
• Insert a screwdriver etc into the hole at the end of the pipe and be sure to push
to the base of the drain cap.
Insert the drain hose.
• Push the drain hose until it is at the base of the drain box connection outlet.
• Please make sure the drain hose hook is fastened properly over the extruding
drain box connection outlet.
Hooks
Storing in the piping space of the indoor unit (Fig. 5-3)
* When the drain hose will be routed indoors, be sure to wrap it with commercially
available insulation.
* Gather the drain hose and the refrigerant piping together and wrap them with the
supplied felt tape
.
* Overlap the felt tape
at one-half of the tape width.
* Fasten the end portion of the wrapping with vinyl tape, etc.
Gas pipe
Liquid pipe
Drain hose
Indoor/outdoor connection wiring
Felt tape
Check of drainage (Fig. 5-4)
1. Open the front grille and remove the filter.
2. Facing the fins of the heat exchanger, slowly fill with water.
3. After the drainage check, attach the filter and close the grille.
A
B
C
E
D
C
F
C
G
H
I
A
a
b
A
A
B
Fig. 5-2
Fig. 5-3
Fig. 5-4
A
B
D
E
C
J
K
