Electrical Installation - Hitachi air core 600 Installation & Maintenance Manual

9.5 Electrical Installation

● Use an ELB (Electric Leakage Breaker). If not used, it may cause an electric shock or a fire.
● Do not operate the system until all the check points have been cleared.
(A) Check to ensure that the insulation resistance is more than 2MΩ, by measuring the resistance between
ground and the terminal of the electrical parts. If not, do not operate the system until the electrical
leakage is found and repaired.
(B) Check to ensure that the stop valves of the outdoor unit are fully opened and then start the system.
● Do not touch any of the parts by hand at the discharge gas side, since the compressor chamber and the
pipes at the discharge side are heated higher than 90℃.
Model
Power Supply
Capacity
18K 220-240V ~, 50Hz
25K/30K 220-240V ~, 50Hz
36K 220-240V ~, 50Hz
42K/48K/55K 380-415V 3N ~, 50Hz
Max. Running Current(A): REFER TO NAMEPLATE
NOTES:
1) Follow local codes and regulations when selecting field wires, and all the above are minimum size.
2) The wire sizes in the table are selected at the maximum current of the unit according to the
IEC60335-1 or regional standards. Use the wires which are not lighter than the ordinary polychloroprene
sheathed flexible cord (code designation H07RN-F).
When connecting the terminal block using flexible cord, make sure to use the round crimp-style terminal
for connection to the power supply terminal block.
Place the round crimp-style terminals on the wires up to the covered
part and secure in place.
When connecting the terminal block using a single core
wire, be sure to perform curing.
3) When the transmitting cable exceeds 15 meters, a larger wire size should be selected.
4) Use a shielded cable for the transmitting circuit and connect it to ground.
5) If power cables are connected in series, add each unit maximum current and select wires below.
* If current exceeds 63A, do not connect cables in series.
ELB
Nominal Nominal Sensitive
Current Current
(A) (mA)
20 30
25 30
32 30
25 30
Selection According to IEC60335-1
Current i(A)
Wire Size (mm )
i≤6
6＜i≤10
10＜i≤16
16＜i≤25
25＜i≤32
32＜i≤40
40＜i≤63
63＜i
34
Installation and Maintenance
Power Source
Cable Size
IEC60335-1*1
2
3×2.5mm
2
3×2.5mm
2
3×2.5mm
2
5×2.5mm
Round crimp-style terminal
Terminal
Single core wire
2
0.75
1
1.5
2.5
4
6
10
*
Transmitting
Cable Size
Circuit
Breaker
(A)
IEC60335-1*1
2
20
4×1.5mm
2
25
4×1.5mm
2
32
4×1.5mm
2
25
4×1.5mm
covered part
Flexible cord