- 39 -
1
1
1
1
1
-9.
Electrical wiring
Precautions on electrical wiring
Warning:
Electrical work should be done by qualified electrical engineers in accord-
ance with “Engineering Standards For Electrical Installation” and supplied
installation manuals. Special circuits should also be used. If the power cir-
cuit lacks capacity or has an installation failure, it may cause a risk of elec-
tric shock or fire.
1. Be sure to take power from the special branch circuit.
2. Be sure to install an earth leakage breaker to the power.
3. Install the unit to prevent any of the control circuit cables (remote controller,
transmission cables) being in direct contact with the power cable outside the
unit.
4. Ensure that there is no slack on all wire connections.
5. Some cables (power, remote controller, transmission cables) above the ceiling
may be bitten by mouses. Use as many metal pipes as possible to insert the
cables into them for protection.
6. Never connect the power cable to leads for the transmission cables. Otherwise
the cables will break.
7. Be sure to connect control cables to the indoor unit, remote controller, and the
outdoor unit.
8. Put the unit to the ground on the outdoor unit side.
9. Be sure to connect between the control cable terminal block of the outdoor unit
and that of the indoor unit. (Cables have polarity, so make sure that they are
connected according to the terminal numbers.)
10. Fix power source wiring to control box by using buffer bushing for tensible force
(PG connection or the like). Connect control wiring to control terminal bed
throngh the knockout hole of control box using ordinary bushing.
Caution:
Be sure to put the unit to the ground on the outdoor unit side. Do not con-
nect the earth cable to any gas pipe, water pipe, lightening rod, or telephone
earth cable. Incomplete grounding may cause a risk of electric shock.
[Wiring example] (For metal piping)
Power Cable
Breaker Capacity
Fuse
Control Cable
PEH-7, 8MYB 2.0 mm
2
or thicker
15 A
15 A
PEH-10MYB
2.0 mm
2
or thicker
15 A
15 A
*
The grounding wire must be of the same diameter as the power cable wires.
[Selecting earth leakage breaker (NV)]
To select NF or NV instead of a combination of Class B fuse with switch, use the
following:
•
In the case of Class B fuse rated 15 A
Fuse (class B)
15 A
Earth leakage
NV-30CA
breaker ELB
15 A
(with over-load protection)
30 mA 0.1s or less
NV is a product name of MITSUBISHI.
•
Power supply cords of appliances shall not be lighter than design 245 IEC or
227 IEC.
•
A switch with at least 3 mm contact separation in each pole shall be provided
by the Air conditioner installation.
Caution:
Do not use anything other than the correct capacity breaker and fuse. Using
fuse, wire or copper wire with too large capacity may cause a risk of mal-
function or fire.
Location of cable holes
•
Switching the external static pressure (PEH-10MYB only)
The unit has been set at the factory so that the standard amount of air is
provided when the static pressure outside the unit is 150 Pa. However, it is
possible to change the motor torque so that the standard amount of air is
provided when the static pressure outside the unit is less than 30 Pa. This can
be done by removing the white connector and connecting the red one (both
connectors are provided inside the control box) as shown below.
Cable or wire of
0.8 mm
2
or thicker
(12 VDC)
A
A
A
B
B
B
C
G
E
J
J
D
D
F
I
H
F
In case of
PEH-7,8
In case of
PEH-10
[Fig.
1
1
1
1
1
-9.0.1]
A
Power supply
B
Main switch/fuse (field supply)
C
Power supply wiring for outdoor unit
D
Power supply wiring for indoor unit
E
Outdoor unit
F
Indoor unit
G
Connection wiring for indoor/outdoor
units (polarity)
H
Remote controller
I
Connection wiring for indoor/remote
controller (no polarity)
J
Grounding
F
G
D
A
B
C
H
G
C
H
E
F
D
A
B
E
L
1
L
2
L
3
L
1
L
2
L
3
N
L
1
N
L
1
L
2
L
3
N
3 phase
3 phase
3 phase
Single phase
S2
S1
S3
S2
S1
S3
S2
S1
S3
S2
S1
S3
[Fig.
1
1
1
1
1
-9.0.2]
A
Indoor unit
B
Power cable wiring
C
Control cable wiring
D
Outdoor unit
E
Breaker
F
Fuse
G
Power cable terminal bed
H
Control cable terminal bed
In case of PEH/PUH-7, 8
In case of PEH/PUH-10
A
B
C
[Fig.
1
1
1
1
1
-9.0.3]
A
For remote controller cables
B
For outdoor unit connection
cables
C
For power supply cables
[Fig.
1
1
1
1
1
-9.0.4]
A
B
B
E
C
D
A
White connector (C01)
B
Red connector (C02)
C
Remove
D
Accessory connector
E
Install
Only PEH-10
