Mitsubishi Electric MSZ-AY20VGK Installation Manual page 6

2-4. Pipe Forming and Drain Piping
Pipe forming
• Place the drain hose below the refrigerant piping.
• Make sure that the drain hose is not heaved or
snaked.
• Do not pull the hose when applying the tape.
• When the drain hose passes the room, be sure
to wrap insulation material (obtainable at a store)
around it.
Drain piping
• Do not cut the drain hose of the unit. (Figure 1)
• If the extension drain hose has to pass through a room, be sure to wrap it with
commercially sold insulation.
• The drain hose should point downward for easy drain flow. (Figure 2)
• If the drain hose provided with the indoor unit is too short, connect it with drain
hose (I) that should be provided at your site. (Figure 3)
• When connecting the drain hose to the hard vinyl chloride pipe, be sure to
insert it securely into the pipe. (Figure 4)
• Make sure that no stress is applied to the connecting portion of the drain hose
after installing the indoor unit. Otherwise, breakage or water leakage may
result.
• Be sure to use the drain hose attached to the indoor unit. Otherwise, water
leakage or breakage due to chemical may result.
• Do not apply any agent on the drain port. Doing so may cause breakage.
EN
Figure 1
Drain
hose
Downward
slope
Soft hose
I.D. 15 mm
Figure 2 Figure 3
Do not make drain piping as shown below.
Do not raise
Water Water
leakage leakage
Do not put the drain pipe directly in a drainage ditch where Ammonia or
Sulphuric gas may be generated. The evaporated corrosive gas may return
to the indoor side through drain pipe and this may cause an unpleasant odor
and corrosion on Heat exchanger may occur.
Rear, right, or downward piping
1) Put the refrigerant piping and the drain
hose together, then firmly apply piping
tape (G) from the end.
2) Insert the piping and the drain hose
into the wall hole sleeve (C), and hook
the upper part of the indoor unit on the
installation plate (1).
3) Check if the indoor unit is hooked securely on the installation plate (1) by
moving the unit to left and right.
4) Thrust the lower part of the indoor unit into the installation plate (1).
EN-5
Felt tape (4)
Piping tape (G)
Liquid pipe
Indoor/outdoor unit
connecting wire (A)
Drain hose
Hard vinyl chloride
70 cm
pipe I.D. 30 mm
or more
Insert
securely
Different
diameter joint
Figure 4
Accumulated
Tip of drain
drain water
hose dipped
Air
in water
Water Ditch
Waving
leakage
Cut off in case of
right piping.
Cut off in case of
downward piping.
Left or left-rear piping
Note:
Be sure to reattach the drain hose and the drain cap in case of left or left-
rear piping.
Otherwise, it could cause drops of water to drip down from the drain hose.
Gas pipe
1) Put the refrigerant piping and the drain hose together, then firmly apply felt
tape (4) from the end.
Felt tape (4) overlap
width should be 1/3
the tape width. Use
a bandage stopper
at the end of felt tape
(4).
2) Pull out the drain cap
at the rear right of the
indoor unit. (Figure 1)
• Hold the convex section at the end and pull
the drain cap.
3) Pull out the drain hose at the rear left of the
indoor unit. (Figure 2)
• Hold the claw marked by the arrows and
pull out the drain hose forward.
4) Put the drain cap into the section to which the
drain hose is to be attached at the rear of the
indoor unit. (Figure 3)
• Insert not sharp-edged tools such as screw-
drivers into the hole at the end of the cap
and insert the cap fully into the drain pan.
5) Insert the drain hose fully into the drain pan at
the rear right of the indoor unit. (Figure 4)
• Check if the hose is hooked securely to the
projection of its inserting part at the drain
pan.
6) Insert the drain hose into wall hole sleeve
(C), and hook the upper part of indoor unit on
installation plate (1). Then, move the indoor unit
completely to the left in order to make placing
the piping in the back space of the unit easier.
7) Cut out the spacer from the packaging styrofoam
and set it on the rib on the back of the indoor
unit. (Figure 5)
• Pay attention to the direction of the spacer
and set it securely on the SPACER AREA
of the installation plate.
8) Connect the refrigerant piping with the extension
pipe (B).
9) Thrust the lower part of the indoor unit into the
installation plate (1).
At least
50 mm
gap
Cut off in case of left
Piping tape (G)
piping.
Felt tape (4)
Drain cap
Figure 1
Drain hose
Figure 2
Figure 3
Drain hose
Figure 4
Do not allow
contact between
the indoor unit
and the ceiling.
Spacer
Figure 5
Drain cap
Drain cap