Pipe Forming And Drain Piping - Mitsubishi Electric MSZA09NA Installation Manual

2-4. PIPE FORMING AND DRAIN PIPING

2-4-1. 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.
Note:
Screws may damage the cover of refrigerant pipe during left piping.
Make sure not to damage the cover of refrigerant pipe.
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.
1) Put the refrigerant piping and the drain hose together, then firmly apply felt tape (7)
from the end.
Felt tape (7) overlap width should be 1/3 the tape width. Use a bandage stopper at
the end of felt tape (7).
2) Pull out the drain cap at the rear right of the indoor unit. (Fig. 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. (Fig. 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. (Fig. 3)
• Insert not sharp-edged tools such as screwdrivers 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. (Fig. 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 a piece of cardboard from the shipping box, roll it up, hook it onto the back
rib, and use it as a spacer to lift the indoor unit. (Fig. 5)
8) Connect the refrigerant piping with the extension pipe (B).
9) Thrust the lower part of the indoor unit into the installation plate (1).
Rear 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).
Right piping
Note:
Before performing the following, make sure that wiring is completed, and the conduit
cover is installed. (Refer to 2-3.)
1) Put the refrigerant piping and the drain hose together, position them to left side, and
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).
2-4-2. DRAIN PIPING
• If the extension drain hose has to pass through a room, be sure to wrap it with com-
mercially sold insulation.
• The drain hose should point downward for easy drain flow. (Fig. 1)
• 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. (Fig. 2)
• When connecting the drain hose to the hard vinyl chloride pipe, be sure to insert it
securely into the pipe. (Fig. 3)
Piping tape (G)
Felt tape (7)
Drain cap
Drain cap
Cut off in case of down-
ward piping.
Cut off in case of
right piping.
To the left
Drain
hose
Downward
slope
Soft hose I.D.
19/32 in.
(15 mm)
Fig. 1 Fig. 2
Do not make drain piping as shown below.
Accumulated
Do not raise
drain water
Water Water
Waving
leakage leakage
Liquid pipe
Gas pipe
Indoor/outdoor unit
connecting wire (A)
Felt tape (7)
Piping tape (G)
Cut off in case of left
piping.
Drain cap
Drain hose
Fig. 1
Fig. 3
Fig. 5
Drain hose
Hard vinyl chloride pipe
27-9/16 in.
I.D. 1-3/16 in.
(70 cm)
(30 mm)
or more
Insert
securely
Different
diameter joint
Fig. 3
Tip of drain
hose dipped
Air
in water
Water
Ditch
leakage
Fig. 2
Drain hose
Fig. 4
At least
1-31/32 in.
(50 mm)
gap