Hitachi FSXN Series Service Manual page 82

4 Electrical wiring
Connect the three-phase power cables on terminals L1, L2, L3 and N of the TB1 -A- terminal board and connect the earth
wire to the screw-in terminal -B-. Use insulated terminals or heat-shrink covers.
D: harness lifter for fixing the transmission wiring (2 places).
Connect the communication cables on the terminals of the TB2 -C- of the PCB1:
• From the indoor units to the outdoor unit: terminals 1 and 2.
• From the outdoor unit to the next outdoor unit in the same refrigerant cycle: terminals 3 and 4:
E: ø53 mm pre-drilled hole for power cables.
F: ø26 mm pre-drilled hole for communication cables.
G: Cord board (accessory) for fixing power supply wiring.
H: shielded twist pair cable.
N O T E
Completely seal the entrance to the duct using sealant, etc. to prevent water from entering.
Tighten the connection terminals as shown in the following table:
¿ Connection of indoor units
Connect each outdoor unit to a power supply line. Install an earth leakage breaker, fuse and circuit breaker for each outdoor
unit power line.
Connect each group of indoor units corresponding to an outdoor unit to a voltage supply line (maximum capacity for each
group of indoor units: 26 HP). Install an earth leakage breaker, fuse and circuit breaker for each group of indoor units.
Connect the communication cable between the indoor units, the CH units and the outdoor units.
75
SMGB0065 rev. 1 - 12/2010
Size
M4
M5
M6
M8
M10
C
B
D
H
A
B
G
E
F
Tightening torque (Nm)
(1.0–1.3)
(2.0–2.4)
(4.0–5.0)
(9.0–11.0)
(18.0–23.0)
4