Electrical Wiring - Mitsubishi Electric PEH-RP250MYA Installation Manual

10. 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 that any of the control circuit cables (remote control-
ler, transmission cables) is brought in direct contact with the power cable out-
side 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 would be broken.
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
through the knockout hole of control box using ordinary bushing.
In case of A-control wiring there is high voltage potential on the S3 terminal
caused by electrical circuit design that has no electrical insulation between
power line and communication signal line. Therefore, please turn off the main
power supply when servicing. And do not touch the S1, S2, S3 terminals
when the power is energized. If isolator should be used between indoor unit
and outdoor unit, please use 3-potes type.
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.
<Indoor unit controller board power supplied
from outdoor unit>
The following connection pattern is available when connecting to PUH-P and PUHZ-
RP outdoor unit.
[Fig. 10.0.1] (P.5)
A Outdoor unit power supply
B Indoor fan motor power supply
C Earth leakage breaker
D Wiring circuit breaker or isolating switch
E Power supply wiring for outdoor unit
F Power supply wiring for indoor unit
G Outdoor unit
I Connection wiring for indoor/outdoor units (polarity)
J Remote controller
K Connection wiring for indoor/remote controller (no polarity)
L Grounding
* Affix a label A that is included with the manuals near each wiring diagram for
the indoor and outdoor units.
[Wiring example] (For metal piping)
Power Cable
PEH-RP200MYA
1.5 mm 2 or thicker
PEH-RP250MYA
2
1.5 mm or thicker
* The grounding wire must be of the same diameter as the power cable wires.
H Indoor unit
Remote controller
Breaker
Fuse
cable
Capacity
15 A 15 A
Cable or wire of
0.3 ~ 1.25 mm 2
15 A 15 A (max. DC 12 V)
[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)
Earth leakage
breaker ELB
(with over-load protection)
NV is a product name of MITSUBISHI.
• Power supply cords of appliances shall not be lighter than design 245 IEC 53
or 227 IEC 53.
• Indoor unit/outdoor unit connecting cords shall not be lighter than design 245
IEC 57.
• A switch with at least 3 mm contact separation in each pole shall be provided
by the Air conditioner installation.
• The connection wiring between the outdoor and indoor units can be extended
up to a maximum of 80 m.
If 4 mm 2 used and S3 separated, Max. 50 m.
2
If 6 mm used and S3 separated, Max. 80 m.
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.
<Indoor unit controller board power supplied
from indoor unit>
The following connection pattern is available when connecting to PUHZ-RP out-
door unit only.
[Fig. 10.0.2] (P.5)
A Outdoor unit power supply
B Indoor fan motor power supply
C Earth leakage breaker
D Wiring circuit breaker or isolating switch
E Power supply wiring for outdoor unit
F Power supply wiring for indoor unit
G Outdoor unit
I Connection wiring for indoor/outdoor units (polarity)
J Remote controller
K Connection wiring for indoor/remote controller (no polarity)
L Grounding
* Affix a label B that is included with the manuals near each wiring diagram for
the indoor and outdoor units.
If the indoor unit controller board power supplied from indoor unit, refer to the table
at the below. Change the indoor unit electrical box wiring refering to the figure
below and the DIP switch settings of the outdoor unit control board.
Indoor unit electrical box connector
connection change
Label affixed near each wiring diagram
for the indoor and outdoor units
Outdoor unit DIP switch settings (when
indoor unit controller board power sup-
plied from indoor unit only)
* There are two types of labels (labels A and B). Affix the appropriate labels to
the units according to the wiring method.
15 A
NV100-SW
15 A
30 mA 0.1s or less
H Indoor unit
Indoor unit specifications
Required
Required
ON 3
OFF 1 2 (SW8)
15