Mitsubishi MFZ-KA09NA Installation Manual page 7

2-10. DRAIN PIPING
• The drain hose should point downward for easy drain. (Fig. 1)
Drain
hose
27-9/16 in.
(70 cm) or
Downward
more
slope
Soft hose
I.D. 19/32 in.
(15 mm)
Fig. 1 Fig. 2
• If the drain hose provided with the indoor unit is too short, connect it with a field-supplied drain hose (I). (Fig. 2)
• When connecting the drain hose to a hard vinyl chloride pipe, be sure to insert it securely into the pipe. (Fig. 3)
• If the extension drain hose has to pass through a room, be sure to wrap it with insulation (field-supplied).
The Drain hose is removed at installation.
• When routing the drain piping, make sure that the drain hose (1) is routed as shown. (Fig. 4)
• Insert the drain hose all the way to the base of the drain pan (end connection). (Fig. 5)
Make sure that the catch of the drain hose is securely hooked onto the projection on the hose fitting
of the drain pan.
• After connecting the drain hose, be sure to pull the hose to confirm that it is connected securely.
The catch should be located
on the underside of the hose.
Conduit
pipe
Fig. 4
2-11. E MBEDDING THE INDOOR UNIT IN A WALL
• When installing a grating, use a grating with narrow upper and lower horizontal bars so that the airflow from the upper and lower air outlets does not contact the
bars. If the horizontal bars will block the lower air outlet, use a stand, etc., to adjust the height of the indoor unit. If the upper or lower air outlet is blocked, the air
conditioner will not be able to cool or warm the room well.
• Do not block the receiver with the grating. Otherwise, the grating will interfere with the remote controller signal and significantly reduce the distance and area (angle)
from which the signals can be received.
• Use a grating with vertical bars, etc., that has at least 75% open area. If the grating has horizontal bars or if the open area is less than 75%, performance could be
reduced.
• When the indoor unit is embedded in a wall (built-in), the time it takes for the room temperature to reach the set temperature will increase.
3-15/16(100)
Upper air outlet
or more
Lower air outlet
EMBEDDED INDOOR UNIT SETTING (MUST BE PERFORMED)
• When embedding the indoor unit in a wall, restrict the movement of the horizontal vane
for the upper air outlet so that it only operates horizontally.
• If this setting is not performed, heat will build up in the wall and the room will not be
cooled or warmed properly.
• Cut the wires on the left and right sides of JRFBL using a pair of nippers, etc., as shown
below.
Drain hose
Hard vinyl chloride
pipe I.D. 1-3/16 in.
(30 mm)
Insert
securely
Different
diameter joint
Fig. 3
Projection
* This projection is located on the
underside of the hose fitting.
Make sure to hook the catch.
Fig. 5
Backboard
3-15/16(100)
or more
Receiver
2-3/8(60)
1-1/32(26)
Partition board
Do not make drain piping as shown below.
Accumulated
Do not raise
drain water
Water Water
Waving
leakage leakage
• Route the drain hose diagonally below the con-
necting pipes.
• Make sure that the drain hose is not routed up-
ward and that there are no waves in the hose.
• Do not pull the hose when applying the tape.
• Route the piping so that it does not project past
the rear of the indoor unit.
Piping
tape
Pull the hose
to confirm it
is connected
securely.
Drain hose
Drain hose
Partition board
Grating
31/32-1-3/8
(20-35)
Cut
Cut the wires on both ends.
Tip of drain
hose dipped
Air
in water
Water
Ditch
leakage
Refrigerant
piping
Conduit
Piping bent
pipe
outward
inch(mm)
Indoor unit
Partition board
Backboard
Indoor temperature thermistor
Control board
Cut the JRFBL wires.
At least
1-31/32 in.
(50 mm)
gap
Push
En-