6
4. Electrical work
4.1. Indoor unit (Fig. 4-1)
1. Remove the electrical wiring service panel.
2. Remove the electrical box cover.
3. Remove the MA Remote controller terminal cover.
4. Wire the power cable and control cable separately through the respective wiring
entries given in the diagram.
• Do not allow slackening of the terminal screws.
• Leave excess cable so that the electrical box cover can be suspended below the
unit during servicing. (Approx. 50 to 100 mm, 2 to 4 inch)
A
Entry for remote controller cable
B
Entry for power and control cable
C
Clamp
D
Electrical box cover
E
Service panel for electrical wiring
F
Temporary hook for electrical box cover
G
MA Remote controller terminal cover
H
Power supply terminals (with earth terminal) (L1, L2, GR)
I
Transmission terminals (M1,M2,S)
J
MA Remote controller terminal (1,2)
K
Secure with the clamp
Fig. 4-1
D
C
TB2
TB5
TB15
S
1 2
M1
L1 L2 GR
M2
A
B
~230V
Total operating current of the indoor unit
Minimum wire thickness (mm²/AWG)
Breaker for wiring
(NFB)
Ground-fault interrupter *1
Main cable
Branch
Ground
Capacity
Fuse
F0 = 15A or less *2
2.1/14
2.1/14
2.1/14
15
15
15
15A current sensitivity *3
F0 = 20A or less *2
3.3/12
3.3/12
3.3/12
20
20
20
20A current sensitivity *3
F0 = 30A or less *2
5.3/10
5.3/10
5.3/10
30
30
30
30A current sensitivity *3
Apply to IEC61000-3-3 about max. permissive system impedance.
*1 The Ground-fault interrupter should support inverter circuit.
The Ground-fault interrupter should combine using of local switch or wiring breaker.
*2 Please take the larger of F1 or F2 as the value for F0.
F1 = Total operating maximum current of the indoor units × 1.2
F2 = {V1 × (Quantity of Type1)/C} + {V1 × (Quantity of Type2)/C} + {V1 × (Quantity of Type3)/C} + {V1 × (Quantity of Others)/C}
Indoor unit
V1
V2
Type 1
PLFY-NBMU, PMFY-NBMU, PEFY-NMSU,
PCFY-NKMU, PKFY-NHMU, PKFY-NKMU
18.6
2.4
Type 2
PEFY-NMAU
38
1.6
Type 3
PEFY-NMHSU
13.8
4.8
Others
Other indoor unit
0
0
C : Multiple of tripping current at tripping time 0.01s
Please pick up "C" from the tripping characteristic of the breaker.
4.2. Power supply wiring
• Install an earth line longer than other cables.
• Power supply codes of appliance shall not be lighter than design 245IEC57 or
227IEC57, 245 IEC 53 or 227 IEC 53.
• A switch with at least 3 mm, 1/8 inch contact separation in each pole shall be
provided by the air conditioner installation.
[Fig. 4-2]
A
Ground-fault interrupter
B
Local switch/Wiring breaker
C
Indoor unit
D
Pull box
Fig. 4-2
C
C
C
C
C
A
B
D
~230V
