E-
22
Wiring Work (Continued)
Unit
Model
Rating current
AVXDS
020
032
040
052
072
100
110
145
0.32A
0.34A
0.35A
0.65A
0.70A
0.80A
1.05A
1.40A
Rating current
Specification of electronic wire
Power supply
MCCB ELB or ELCB Power cable Earth cable
Communication
cable
Max : 242V
Min : 198V
X A
X A, 30mA
0.1 sec
0.0039inch
2
(2.5mm
2
)
0.0039inch
2
(2.5mm
2
)
0.0012~0.0023inch
2
(0.75~1.5mm
2
)
Decide the capacity of ELCB(or MCCB+ELB) by below formula.
The capacity of ELCB(or MCCB+ELB) X [A] = 1.25 X 1.1 X ∑Ai
X : The capacity of ELCB(or MCCB+ELB)
∑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[ft], A
k
: Power cable specification[inch
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 = 328ft(100m), Running current of each units 1[A]
- Total 10 indoor units were installed
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.
Installing with 2 different sort wire.
10[A]
Indoor unit10
65.6ft(20m)
32.8ft(10m)
0ft(0m)
9[A]
1[A]
328ft(100m)
Indoor unit2
Indoor unit1
ELCB
220[V]
-2.2[V]
-2.0[V]
············ 0.0039inch
2
(2.5mm
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
0.0039inch
2
(2.5mm
2
)
0.0039inch
2
(2.5mm
2
)
220[V]
-1.4[V]
-1.2[V]
············ 0.0039inch
2
(2.5mm
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
0.0062inch
2
(4.0mm
2
)
0.0062inch
2
(4.0mm
2
)
Or MCCB+
ELB
AVXDS@@_IM_E_30798-1_8.31.09.indd 22
2009-8-31 10:27:27
