7
4. Electrical work
Constraints on transmission cable (Fig. 4-3)
Longest wiring length (L
1
+L
2
+L
4
or L
1
+L
3
or L
2
+L
3
+L
4
): less than 200 m
Length between indoor unit and remote controller (
R
): within 10 m
G
Outdoor unit
H
Earth
I
BC controller
J
Indoor unit
K
M-NET Remote controller
L
Non-polarized 2-wire
Note:
*1 Put the transmission cable earth via the outdoor unit’s earth terminal
to
the ground.
*2 If the remote controller cable exceeds 10 m, use a 1.25 mm
2
diameter cable
over the exceeded portion, and add that exceeded portion to within 200 m.
*3 The BC controller is required only for simultaneous cooling and heating
series R2.
4.3. Setting addresses (Fig. 4-4)
(Be sure to operate with the main power turned OFF.)
• There are two types of rotary switch setting available: setting addresses 1 to 9 and
over 10, and setting branch numbers.
Note:
Please set the switch SW5 according to the power supply voltage.
• Set SW5 to 240 V side when the power supply is 230 and 240 volts.
• When the power supply is 220 volts, set SW5 to 220 V side.
A
Address board
4.4. Types of control cables
1. Wiring transmission cables: Shielding wire CVVS or CPEVS
• Cable diameter: More than 1.25 mm
2
2. M-NET Remote control cables
Kind of remote control cable Shielding wire MVVS
Cable diameter
More than 0.5 to 1.25 mm
2
Remarks
When 10 m is exceeded, use cable with the same
specifications as transmission line wiring
3. MA Remote control cables
Kind of remote control cable 2-core cable (unshielded)
Cable diameter
0.3 to 1.25 mm
2
Fig. 4-3
SW14
0
SW11
0
SW12
0
1 2 3 4 5 6 7 8 9 10
ON
OFF
SW1
SW5
220V
240V
SWC
CN82
CN43
A
Fig. 4-4
G
I
J
J
J
K
K
K
K
J
J
L
K
H
*1
*3
L1
L2
L4
r
L3
*2
1
2
3
5. Installing the grille
5.1. Checking the contents (Fig. 5-1)
• This kit contains the following parts.
Accessory name
Q’ty
Remark
1
Grille
1
2
Screw
6
M5
×
0.8
×
16
3
Screw
1
4
×
16
A
Points for securing the grille
B
Points for securing the grille
C
Indoor unit
D
Ceiling surface
E
Drainage pan
F
Places for securing front grille
G
Make sure these surfaces are flush with each
other (0-3 mm).
Fig. 5-2
Fig. 5-1
Fig. 5-3
A
B
C
F
G
E
D
5.2. Checks before setting in place (Fig. 5-2, 3)
• Before installing the front panel, make sure the indoor unit is square with the ceiling
opening (or parallel to the angle between the wall and the ceiling).
• Check that the four points where the front panel will be secured are in contact with
the ceiling surface.
• Check that the insulation for the refrigerant pipes, drainage pipes, etc. is in place
and that wiring connections and arrangements are complete.