Mitsubishi Electric MUZG12NA Installation Manual page 5

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 crowded or bent.
• Do not pull the hose when applying the tape.
supplied).
Note:
Make sure not to damage the cover of refrigerant pipe when attaching it back on with
screws.
Left or left-rear piping
Note:
Be sure to reattach the drain hose and the drain cap if the piping is being installed on
left or left-rear of unit, otherwise, water could drip down from the drain hose.
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 back 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 back 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 a screwdriver into the hole on the cap and insert the cap fully into the drain
pan.
5) Insert the drain hose fully into the drain pan at the back 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 attach the upper part of indoor unit
onto the installation plate (1). Then, shift the indoor unit completely to the left to make
placing the piping in the back 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) Attach the lower part of the indoor unit into the installation plate (1).
Rear or bottom piping
(G) from the end.
2) Insert the piping and the drain hose into the wall hole sleeve (C), and attach the upper
part of the indoor unit on the installation plate (1).
3) Check if the indoor unit is attached securely on the installation plate (1) by moving the
unit to left and right.
4) Attach 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) Place the refrigerant piping and the drain hose together, shift them to left side of the
2) Insert the piping and the drain hose into the wall hole sleeve (C), and attach the upper
part of the indoor unit on the installation plate (1).
3) Check if the indoor unit is attached securely on the installation plate (1) by moving the
unit to left and right.
4) Attach 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 insulation
• The drain hose should point downward for easy drain. (Fig. 1)
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)
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.
Felt tape (4)
Piping tape (G)
Piping tape (G)
Felt tape (4)
Drain cap
Drain cap
Remove corner box for piping
on bottom side of unit
Remove
corner box
for piping on
right side of
unit
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)
Remove box for piping on
left side of unit.
Drain hose
Fig. 1
Drain hose
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
Fig. 4
At least
1-31/32 in.
(50 mm)
gap