E-
19
Wiring Work
Unit
Model
Rating current
AVXWV
022
028
036
056
071
0.13A
0.18A
0.19A
0.30A
0.30A
Rating current
Specification of electronic wire
Power supply
MCCB
ELB
Power cable Earth cable
Communication
cable
Max : 242V
Min : 198V
X A
X A, 30mmA
0.1 sec
2.5mm
2
2.5mm
2
0.75~1.5mm
2
Decide the capacity of ELB and MCCB by below formula.
The capacity of ELB, MCCB X [A] = 1.25 X 1.1 X ∑Ai
X : The capacity of ELB, MCCB
∑Ai : Sum of Rating currents of each indoor unit.
Refer to each installation manual about the rating current of indoor unit.
Decide the power cable specification and maximum
length within 10% power drop among indoor units.
coef: 1.55
L
k
: Distance among each indoor unit[m], A
k
: Power cable specification[mm
2
]
i
k
: Running current of each unit[A]
∑ (
Coef×35.6×L
k
×i
k
) <
10% of input
voltage[V]
1000×A
k
n
k=1
Example of Installation
- Total power cable length L = 100(m), Running current of each units 1[A]
- Total 10 indoor units were installed
10[A]
Indoor unit10
20[m]
10[m]
0[m]
9[A]
1[A]
100[m]
MCCB
Indoor unit2
Indoor unit1
ELB
Apply following equation.
∑ (
Coef×35.6×L
k
×i
k
) <
10% of input
voltage[V]
1000×A
k
n
k=1
Calculation
Installing with 1 sort wire.
220[V]
-2.2[V]
-2.0[V]
············ 2.5[mm
2
] ············
208.8[V](Within 198V~242V)
-(2.2+2.0+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-11.2[V]
it's okay
2.5[mm
2
]
2.5[mm
2
]
Installing with 2 different sort wire.
220[V]
-1.4[V]
-1.2[V]
············ 2.5[mm
2
] ············
209.5[V](Within 198V~242V)
-(1.4+1.2+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-10.5[V]
it's okay
4.0[mm
2
]
4.0[mm
2
]
AVXWV@@_IM_E_29819-1_4.14.09.indd 19
2009-4-14 10:15:50
