Electrical Work; Power Supply Wiring - Mitsubishi Electric PFFY-P20VKM-E Installation Manual

7. Electrical work

Power supply terminal block (TB2)
Transmission terminal block (TB5)
Wiring clamp
L N
TB2
Fig. 7-2
Indoor controller board
M1 M2 M1 M2 S CN3A
TB3 T B 5
M1 M2
TB3 TB5
Fig. 7-3
Fig. 7-1
M1 M2 S
TB5
M1 M2 S 1 2
T B 5 T B 1 5
M1 M2 S M1 M2 S
TB5
7.1. Indoor unit (Fig. 7-1)
1
Remove the electrical cover.
• Remove 1 screw holding the electrical cover, then move the cover.
• Remove 1 screw holding the cord clamp, then move the clamp.
2
Connect the power line, control line from the outdoor unit, and remote
control lines.
After connecting, secure the wires with the cord clamp.
► Fix power source wiring to control box using buffer bushing for tensile
force. (PG connection or the like.)
• Since the electric box may need to be pulled out for servicing or other occasions,
wires must have enough slack.
• Class 3 grounding work must be conducted (grounding wire diameter: 1.6 mm or
more)
After wiring is completed, reinstall the parts in the reverse order of removal.

7.2. Power supply wiring

• Wiring size must comply with the applicable local and national codes.
• Install an earth line longer than other cables.
• Power supply codes of appliance shall not be lighter than design 60245 IEC 53
or 60227 IEC 53.
• A switch with at least 3 mm contact separation in each pole shall be provided by
the air conditioner installation.
Power cable size : more than 1.5mm² (3-core)
Warning:
Never splice the power cable or the indoor-outdoor connection cable, otherwise it
may result in a smoke, a fire or communication failure.
► Use earth leakage breaker (NV).
For breaker, means shall be provided to ensure disconnection of all active phase
conductors of the supply.
Warning:
Wiring should be done so that the power lines are not subject to tension.
Otherwise, heat may be generated or fire may occur.
[Fig. 7-2]
A Switch 16 A
B Overcurrent protection 16 A
C Indoor unit
7.3. Types of control cables
1. Wiring transmission cables
Types of transmission cable Shielding wire CVVS or CPEVS
Cable diameter More than 1.25 mm²
Length Less than 200m
2. M-NET Remote control cables
Types of remote control cable Shielding wire MVVS
Cable diameter 0.5 to 1.25 mm²
Add any portion in excess of 10m to within the
Length
longest allowable transmission cable length 200m
3. MA Remote control cables
Types of remote control cable 2-core cable (unshielded)
Cable diameter 0.3 to 1.25 mm²
Length Less than 200m
7.4. Connecting remote controller, indoor and outdoor
transmission cables (Fig. 7-3)
• Connect indoor unit TB5 and outdoor unit TB3. (Non-polarized 2-wire)
The "S" on indoor unit TB5 is a shielding wire connection. For specifications about
the connecting cables, refer to the outdoor unit installation manual.
• Install a remote controller following the manual supplied with the remote control-
ler.
• Connect the remote controller's transmission cable within 10 m using a 0.75 mm
core cable. If the distance is more than 10 m, use a 1.25 mm
1 MA Remote controller
• Connect the connector for MA remote controller. (Non-polarized 2-wire)
• DC 9 to 13 V between 1 and 2 (MA remote controller)
a
MA remote controller cable (ACCESSORY
2
M-NET Remote controller
• Connect the "M1" and "M2" on indoor unit TB5 to a M-NET remote controller. (Non
-polarized 2-wire)
• DC 24 to 30 V between M1 and M2 (M-NET remote controller)
A Terminal block for indoor transmission cable
B
Terminal block for outdoor transmission cable
C
Remote controller
D Total operating current be less than 16 A
E Pull box
2
junction cable.
9
)
2
7