Refrigerant Piping Work - Mitsubishi Electric Mr. SLIM PEA-M180LAA Installation Manual

5. Installing the unit
d Remove all the screws Ⓐ through Ⓕ connected to the coil unit from inside of the fan box to separate the fan unit. Screw holes Ⓖ and Ⓗ shown in Fig. 5-1-4 are double-
snowman-shaped. Do not unscrew the screws Ⓖ, Ⓗ, Ⓘ and Ⓙ all the way; only loosen them partway. To separate the fan unit from the coil unit, lift the fan unit and move
it away from the coil unit. The coil unit has an insulation material attached to its bottom (on the drain-pan side). Do not drag the coil unit when moving it. [Fig. 5-1-4]
* Remove the bottom panel of fan unit if screws Ⓐ through Ⓕ are not easy to remove.
[Fig. 5-1-4]
A B
G
J
F
e After moving the unit to the ceiling space, thread the screws Ⓖ, Ⓗ, Ⓘ and Ⓙ through the double-snowman-shaped holes on the fan unit, and re-tighten the screws Ⓐ
through Ⓗ to connect the fan unit and the coil unit.
f Reconnect the thermistor cable to the circuit board, and close the control box cover and cover Ⓐ.
* If the bottom panel was removed in step ④, reinstall it to the fan unit.
5.2. Hanging the unit body
(1) Attach a washer and nut(s) to each suspension bolt. (The nuts are to be supplied
locally.)
(2) Fit the indoor unit to each suspension bolt.
(3) Make sure that the unit is positioned level, then tighten each nut.
[Fig. 5-2-1]
Caution:
Do not suspend either the fan unit or the coil unit alone. The two units must be
connected to each other before being suspended.

6. Refrigerant piping work

6.1. Refrigerant pipe
[Fig. 6-1]
øB
a
øA
a Indoor unit
b Outdoor unit
Model A
M180 ø19.05 ø9.52
M200 ø22.2 ø9.52
M250 ø22.2 ø12.7
Refer to the Instruction Manual that came with the outdoor unit for the restrictions on
the height difference between units and for the amount of additional refrigerant
charge.
Avoid the following places for installation where air conditioner trouble is liable to
occur.
• Where there is too much oil such as for machine or cooking.
• Salty environment as seaside areas.
• Hot-spring areas.
• Where sulfide gas exists.
6
C D
H
I
E
b
B
[Fig. 5-2-2]
A
B
B
A
C
A Nuts (field supply)
B Washer (accessory)
C M10 hanging bolt (field supply)
5.3. Confirming the unit's position and fixing hanging
bolts
 Ensure that the hanging bolt nuts are tightened to fix the hanging bolts.
 To ensure that drain is discharged, be sure to hang the unit at level using a
level.
Caution:
Install the unit in horizontal position. If the side with drain port is installed
higher, water leakage may be caused.
• Other special atmospheric areas.
• This unit has brazed connections on both indoor and outdoor sides. [Fig. 6-1]
• Insulate both refrigerant and drainage piping completely to prevent condensation.
Piping preparation
• Refrigerant pipes of 3, 5, 7, 10 and 15 m are available as optional items.
(1) Table below shows the specifications of pipes commercially available.
Outside diameter
Model Pipe
mm inch
For liquid 9.52
PEA-
M180
For gas 19.05
For liquid 9.52
PEA-
M200
For gas 22.2
For liquid 12.7
PEA-
M250
For gas 22.2
(2) Ensure that the 2 refrigerant pipes are well insulated to prevent condensation.
(3) Refrigerant pipe bending radius must be 10 cm or more.
Caution:
Using careful insulation of specified thickness. Excessive thickness prevents
storage behind the indoor unit and smaller thickness causes dew drippage.
Min. wall Insulation Insulation
thickness thickness material
3/8 0.8 mm 8 mm
3/4 1.0 mm 8 mm
Heat resisting
3/8 0.8 mm 8 mm
foam plastic
0.045 specific
7/8 1.0 mm 8 mm
gravity
1/2 0.8 mm 8 mm
3/8 1.0 mm 8 mm