Power Supply Wiring; Connecting Remote Controller, Indoor And Outdoor Transmission Cables; Connecting Electrical Connections - Mitsubishi Electric PFAV-P250VM-E Manuel D'installation

7.1. Power supply wiring

[Fig. 7.1.1] (P.7)
A Power supply
C Local switch or circuit breaker
E PE (Earth)
Cable thickness
Electric
Power
Model motor
supply Earth
output
cable
2 2
P250 2.2 kW 1.5 mm 1.5 mm
2 2
P500 5.5 kW 4.0 mm 4.0 mm
2 2
P750 7.5 kW 10.0 mm 10.0 mm
P300
2 2
1.5 kW 1.5 mm 1.5 mm
-F
P600
2 2
2.2 kW 1.5 mm 1.5 mm
-F
P900
2 2
3.7 kW 4.0 mm 4.0 mm
-F
*1
Use an earth leakage breaker with sensitivity of 30 mA for 0.1 s or less.
*2
Use an earth leakage breaker with sensitivity of 100 mA for 0.1 s or less.
Note:
1. Be sure to install an earth leakage breaker to the power supply.
2. Use an earth leakage breaker with dedicated earth fault protection in
combination with a local switch or circuit breaker.
3. Bear in mind ambient conditions (ambient temperature,direct sunlight,
rain water, etc.) when proceeding with the wiring and connections.
4. The wire size is the minimum value for metal conduit wiring. The power
cord size should be 1 rank thicker consideration of voltage drops.
Make sure the power-supply voltage does not drop more than 10 %.
5. Specific wiring requirements should adhere to the wiring regulations of
the region.
6. Wiring cross-sections noted are the minimum values for metal and
plastic wiring conduits (containing up to three cables).
7. A switch with at least 3 mm contact separation in each pole shall be
provided by the Air Conditioner installer.
• Power supply cords of appliances shall not be lighter than design 245 IEC 53
or 227 IEC 53.
• This unit is intended for the connection to a power supply system with a
maximum permissible system impedance shown in the above table at the
interface point (power service box) of the user's supply.
• The user must ensure that this unit is connected only to a power supply
system which fulfils the requirement above.
If necessary, the user can ask the public power supply company for the
system impedance at the interface point.
• This unit complies with IEC 61000-3-12 provided that
the short-circuit power Ssc is greater than or equal to
*3
Ssc at the interface point between the user's supply
and the public system. It is the responsibility of the
installer or user of the equipment to ensure, by
consultation with the distribution network operator if
necessary, that the equipment is connected only to a
supply with a short-circuit power Ssc greater than or
*3
equal to Ssc .
Caution:
1. Use only breakers and fuses of the correct capacity. Use of larger
capacity fuses, or wire may result in a fault and smoke or flames.
2. Wire the power supply so that no tension is imparted. Otherwise
disconnection, heating or fire result.
3. If the power cable is damaged, it must be replaced by the manufacturer,
its service agent or similarly qualified persons in order to avoid a
hazard.
7.2. Connecting remote controller, indoor
and outdoor transmission cables
a. Indoor and Outdoor Transmission cable
Connect the terminals M1 and M2 of the terminal block for the indoor and
outdoor transmission cable (TB3) of the outdoor unit (OC) and terminals M1
and M2 of the terminal block for the indoor and outdoor transmission cable
(TB5) of the indoor unit (IC) in a daisy chain. (Non-polarized 2-wire)
[Shielded cable process]
With the earth of the shielded cable, connect the earth terminal (
terminal block (TB3) and S terminal of the IC terminal block (TB5) in a daisy chain.
18
B Earth leakage breaker
D Indoor unit
Local switch
Maximum
Earth
Circuit
allowable
Overcurrent
leakage
Switch
breaker
protection system
breaker
capacity
device
impedance
16A
*1
20A 16A (B type 20A 0.27Ω
fuse)
32A
*2
40A 32A (B type 40A 0.12Ω
fuse)
50A
*2
50A 50A (B type 50A 0.09Ω
fuse)
16A
*1
20A 16A (B type 20A 0.37Ω
fuse)
16A
*1
20A 16A (B type 20A 0.27Ω
fuse)
20A
*2
30A 32A (B type 30A 0.15Ω
fuse)
*3
Model Ssc (MVA)
P250
P500
P750
P300-F
P600-F
P900-F
) of OC
b. MA Remote Controller Cable
* This cable is not needed when operation will not be performed with two
remote controllers or a group.
[In the case of operation with two remote controllers]
In the case of operation with two remote controllers, connect terminals 1 and
2 of the IC terminal block (TB15) and the terminal block of the MA remote
controller.
* Set the connected MA remote controller as the sub remote controller.
(For details on the setting method, see [Fig. 7.2.1] and refer to the operation
manual for the indoor unit.)
[In the case of indoor unit group operation]
In the case of group operation of the IC, connect together the terminal 1 and 2
pairs of both IC terminal blocks (TB15). (Non-polarized 2-wire)
* Set the remote controller of one of the indoor units as the sub remote
controller. (For details on the setting method, see [Fig. 7.2.1].)
[Fig. 7.2.1] (P.7)
A Group
<Allowable length>
MA remote controller cable
Total length (0.3 - 1.25mm²)
m1 + m2 +m3
m4 + m5
<Precautions>
1 Three or more MA remote controllers cannot be connected to indoor units in the
same group.
2 The same address cannot be set for indoor units in the same group.
Setting procedure for the main remote controller and sub remote
controller of the MA remote controllers
When you want to operate two indoor units in one group or perform operation
with two remote controllers, one of the remote controllers needs to be set as
the sub remote controller.
* Up to two remote controllers can be connected in one group.
(Remote controllers are set as the main remote controller at the time of
shipment.)
For details on setting a remote controller as the sub remote controller, refer
to the operation manual for the indoor unit.

7.3. Connecting electrical connections

(Be sure to prevent terminal screws from loosening.)
Caution:
• Fix the site wiring firmly in place with wiring clamps.
• Ensure that wiring installation work does not result in tension being
applied to the wiring. Such tension may result in breaks in wiring, and
consequent overheating, smoke, or flame.
Step 1. Loosen the screws on the front bottom panel of the unit,
remove the panel, and then remove the cover of the control
box.
Step 2. Connect the power supply cable, outdoor transmission cables,
and remote controller cables (when two remote controllers are
used) as shown in [Fig. 7.3.2]. There is no need to remove the
control box.
Referring to [Fig. 7.3.3] or [Fig. 7.3.5], install the cable from the
supplied temperature sensor (supply air temperature sensor).
Step 3. After wiring is complete, check again to make sure there is no
0.24
looseness and incorrect wiring, and reattach the control box
0.47
cover and front bottom panel, following the procedure for
0.78
removal in the reverse order.
0.14
0.21
* When inserting the cables from the left side of the unit, pass them behind the
0.40 rear of the control box and then connect them to the inside the control box
from the position shown in [Fig. 7.3.2] (P250·P500·P300-F·P600-F models).
• When performing wiring, be sure to use separate routes for wiring three-
phase power cables and transmission cables (indoor and outdoor
transmission cable, MA remote controller cables, and temperature sensor
cables).
[Fig. 7.3.1] (P.8) For use with two MA remote controllers
A Top (TB15)
C Non-polarized 10 - 13 VDC
[Fig. 7.3.2] (P.8)
A Remote controller connection (when connecting a remote controller) (non-
polarized 2-wire)
B Earth terminal
D Indoor unit control box
<A> To terminal block for transmission to outdoor unit
* Provide a shielded earth
B MA (Main) C MA (Sub)
= <
200 m
= <
200 m
B MA remote controller
C To three-phase power supply
at the outdoor unit side.