6

Fig. 5-1

5. Drainage piping work
AB
C

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-20/O.D. ø26 mm, 1-1/32
inch PVC TUBE). Make sure that there is no water leakage from the connections.
•If the drain pipe passes indoors it must be covered with insulating material (foamed
polyethylene: specific gravity: 0.03, thickness: 9 mm, 23/64 inch or more) available on the
market.
•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.
ADrain connection socket CIndoor unit’s drain hose
BOn site drain pipe (VP-20)
Caution:
The drain pipe should be installed according to this Installation Manual to en-
sure correct drainage. Thermal insulation of the drain pipes is necessary to
prevent condensation. If the drain pipes are not properly installed and insu-
lated, condensation may drip on the ceiling, floor or other possessions.
Preparing left and left rear piping (Fig. 5-2)
1Remove the drain cap.
•Remove the drain cap by holding the bit that sticks out at the end of the pipe and
pulling.
ADrain cap
2Remove the drain hose.
•Remove the drain hose by holding on to the base of the hose a (shown by arrow)
and pulling towards yourself b.
3Insert 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.
4Insert 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.
BHooks
Remove the side panel of the indoor unit on the drain side. Pour water in the drain
pan and check that it comes out the drain pipe end. After confirmation, reinstall the
side panel.
A
ab
A
A

B

1
3
2
4

Fig. 5-2

4. Installing the refrigerant piping
A
BCDEFG

Fig. 4-4

4.3. Positioning refrigerant and drain piping

1Position of refrigerant and drain piping (Fig. 4-2)
•The drain pipe can be cut midway to meet the on-site conditions.
A(Total length of flexible hose) DDrain hose
BLiquid pipe ELeft-side piping
CGas pipe FRight-side piping
2Determine the position of the knockout holes on the unit body. (Fig. 4-3)
sCut the knockout holes using a saw blade or an adequate knife.
Take care not to damage other parts of the unit.
•Remove the corner box and drill a knockout hole. If a hole is made without remov-
ing the box, the drain hose could be damaged.
ALeft-side piping DRemote controller cable through hole
BLower piping ECorner box
CRight-side piping

Fig. 4-2

E
D
B
CA
C
B
D
F
1-3/8
17-11/16
22-7/8
11-1/32
1-7/32
2-1/8
3-3/8
6-1/32
27-9/16
AE
2-3/8
13/32
7/8
2-3/4
13/16 9-21/32
D
5/16
BED
13/32
7-15/32
7/8
2-3/4 1-3/8
5/16
2-3/8
CE
5/16
2-3/8
13/32
7/8
2-3/4
13/16 9-21/32
D

Fig. 4-3

1
2

4.4. Refrigerant piping (Fig. 4-4)

Indoor unit
1. Remove the flare nut and cap of the indoor unit.
2. Make a flare for the liquid pipe and gas pipe and apply refrigerating machine oil
(available from your local supplier) to the flare sheet surface.
3. Quickly connect the on site cooling pipes to the unit.
4. Wrap the pipe cover 3 that is attached to the gas pipe and make sure that the
connection join is not visible.
5. Wrap the pipe cover of the unit’s liquid pipe and make sure that it covers the
insulation material of the on site liquid pipe.
6. Use the bands that are provided 4 to tighten both ends (15–20mm, 19/32 to
25/32 inch) of each pipe cover 3.
ACooling pipe and insulation (available from local supplier)
BUnit’s gas pipe EBands 4
CUnit’s liquid pipe FOn site gas pipe
DPipe cover 3GOn site liquid pipe
(inch)
(inch)
BG79U874H01_en 05.11.30, 9:236