Mitsubishi Electric Mr.SLIM PKA-MKA Serie Manuel D'installation page 7

3. Installing the indoor unit
C
D
Fig. 3-5
A
Fig. 3-6
B
Fig. 3-8
C
Fig. 3-9
B
A
A
Fig. 3-7
A
E
D
Fig. 3-10
3.3. When embedding pipes into the wall (Fig. 3-5)
• The pipes are on the bottom left.
• When the cooling pipe, drain pipes internal/external connection lines etc are to
be embedded into the wall in advance, the extruding pipes etc, may have to be
bent and have their length modified to suit the unit.
• Use marking on the mount board as a reference when adjusting the length of the
embedded cooling pipe.
• During construction, give the length of the extruding pipes etc some leeway.
Mount board
A 1
Reference marking for flare connection
B
Through hole
C
On-site piping
D
3.4. Preparing the indoor unit
* Check beforehand because the preparatory work will differ depending on the
exiting direction of the piping.
* When bending the piping, bend gradually while maintaining the base of the
piping exiting portion. (Abrupt bending will cause misshaping of the piping.)
Attachment of L-shaped connection pipe 4
Right, left and rear piping (Fig. 3-6)
1. Remove the flare nut and cap of the indoor unit. (Gas pipe only)
2. Apply refrigerating machine oil to the flare sheet surface. (Preparation on
location)
3. Facing the direction in which the L-shaped connection pipe 4 will be removed,
make a quick connection to the indoor unit flare connection opening.
4. Tighten the flare nut using a double open-end wrench. (Fig. 3-9)
Tightening force: 68 to 82 N•m
5. Attach the charge nut 5 to the liquid pipe side joint portion, and check for
leakage of the L-shaped connection pipe 4 connection portion.
Remove the charge nut 5 after completion of the work.
Tightening force: 34 to 42 N•m
6. Cover the flare connection portion with the pipe cover of the L-shaped
connection pipe 4 so that it is not exposed. (Fig. 3-10)
L-shaped connection pipe
A 4
Cut-off position (Straight pipe portion)
B
Tightening direction
C
Cover with pipe cover
D
Cover the flare nut connection portion with the pipe cover.
E
Lower piping (Fig. 3-7)
1. Cut L-shaped connection pipe 4 at the position indicated in (Fig. 3-8).
2. Insert the flare nut that was removed earlier onto the straight pipe side of the cut
L-shaped connection pipe 4 and then flare the end of the pipe.
3. Remove the flare nut and cap of the indoor unit. (Gas pipe only)
4. Apply refrigerating machine oil to the flare sheet surface. (Preparation on
location)
5. Quickly connect the L-shaped connection pipe 4 that has been processed as
described in part 2) to the indoor unit flare connection opening.
6. Tighten the flare nut using a double open-end wrench. (Fig. 3-9)
Tightening force: 68 to 82 N•m
7. Attach the charge nut 5 to the liquid pipe side joint portion, and check for
leakage of the L-shaped connection pipe 4 connection portion.
Remove the charge nut 5 after completion of the work.
Tightening force: 34 to 42 N•m
8. Cover the flare connection portion with the pipe cover of the L-shaped
connection pipe 4 so that it is not exposed. (Fig. 3-10)
en
5