Hitachi RPC-3.0FSN3 - 8 PIPING WORK AND REFRIGERANT CHARGE; 8.1 REFRIGERANT PIPE SELECTION; 8.1.1 Refrigerant Pipe Selection; 8.1.2 Copper Pipes, Sizes, Connection and Insulation

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P5416543
l
Check the recommended size of the ELB shown in Table.
Select high-sensitive high speed ELB when the rated sensitive current is less than 30mA. (The motion
time should be within 0.1 second.)
l
Use 2 core cable (equivalent to following cables: VCTF, VCT, CVV, MVVS, VVR or VVF, size: 0.75mm
2
to 1.25mm
2
(manufactured by HITACHI Cable Co. Ltd.)) or 2 core twist pair cable (equivalent to following
cables: KPEV or KPEV-S (manufactured by HITACHI Cable Co. Ltd.)) for the control cable between the
outdoor unit and the indoor unit. The total cable length should be less than 1000m.
l
Use 2 core twist pair cable (equivalent to following cables: KPEV or KPEV-S) for the remote control
switch cable and the control cable between indoor units. The total cable length should be less than
500m. If the total length of the cable is less than 30m, other cables can be used (the cable size is 0.3mm
2
).
l
Select the wiring size, ELB (Earth Leakage Breaker) and isolating switch according to each regulation of
region and “Installation & Maintenance Manual”, and the dedicated electrical circuit must be used.
l
On the outside indoor unit, the power source cable, control cable and remote control cable shall be
installed separately as possible.
(2) For SET-FREE Series
Select wiring capacity according to the following table. Install the ELB and the main switch to each as
shown in the gures below.
Total
Indoor Unit
Capacity
Power Source
Earth Wire
Size
(mm
2
)
Transition
Wire Size
for Control
Circuit
(mm
2
)
Remote
Control
Switch
Cable
(mm
2
)
ELB Main Switch
Minimum
Wire Size
(mm
2
)
Wiring
Line
Length
(m)
*1)
Rated
Current
(A)
Switch
Capacity
(A)
Fuse
Capacity
(A)
*9 *10 *10 *11 *12 *13
< 7A 15 30 15 2.5 30
3.5
2 Core
Cable
0.75 ~ 1.25
0.75<10A 20 30 20 4.0 34
< 15A 30 30 30 6.0 34
ELB: Earth Leakage Breaker
*1): The above wiring line length shows the case that the indoor units are connected in series. (The voltage drop
is within 2%.) When the power source wiring is longer than the above value, select the minimum wiring size
which the voltage drop is within 2%.
< Heat Pump System > < Heat Recovery System >
Table 7.2 Recommended Wiring Capacity and Size for SET-FREE Series
NOTICE
Outdoor
Unit
Indoor
Unit
Pullbox
Outdoor Unit
Power Source
Indoor Unit
Power Source
Indoor
Unit
Indoor
Unit
ELB
Main
Switch
ELB
*9, *10
*11
*12
*12*12
*13*13
*13
Main
Switch
Refer to “Installation & Maintenance Manual”
of connected outdoor unit for details of wire,
ELB and main switch for outdoor unit.
*11 *11
Outdoor Unit
Power Source
Outdoor
Unit
CH Unit
Indoor Unit
Power Source
Indoor
Unit
Pullbox
Indoor
Unit
Indoor
Unit
ELB
Main
Switch
ELB
*9, *10
*11
*11
*12
*13
*13
*13
*13
Main
Switch
*12
*12
*11*11
Refer to “Installation & Maintenance Manual”
of connected outdoor unit for details of wire,
ELB and main switch for outdoor unit.