Hitachi RAC-112SQB - Page 15

15
Precautions for Wiring
(3) Wiring Indoor and Outdoor Units
□1)Please connect the indoor and outdoor units according to the electrical work instructions in p.13.
1. (No connection for T for single-phase indoor units.) Also, lock the screw of the terminal block with
the torque as shown in the right table.
2. Please refer to the Electrical Equipment Standards to implement electrical work.
3. Do not connect a 230VAC source to terminal blocks ① and ② of the outdoor unit. Wrong
connections will damage the mainboard. Do not connect a 230VAC source to them.
Locking torque
Screw Locking torque (N•m)
M4 1.0~1.3
M5 2.0~2.5
M6 4.0~5.0
M8 9.0~11.0
M10 18.0~23.0
(Methods B and C)
□2) Does the voltage of the power source comply with the rated voltage? Over- or under-voltage will damage the unit.
□3) Is the capacity of the power source adequate to support the unit? Inadequate power capacity may cause mass voltage
drop and the unit cannot be activated.
□4) Failure to earth the indoor and outdoor units may cause electrical shock. Make sure to earth them according to Type 3
method at impedance under 100Ω. Ask a qualified electrician to implement the work.
□5) Make sure to disconnect power source before opening the electrical panel for wiring or service to prevent electric shock.
Warning
When installing the panel cover, avoid jamming wires together to prevent electric shock and fire.
L1 1
L2
2
N
Upper Right Panel Cove
r
Earth cable
Main power cable
Operation circuit cable
Keep an appropriate distance among
terminals. Insulate terminals with plastic
tapes or bushings.
Plastic tapes or bushings
N
ote: Do not use terminals for single-core
cables.
When using single-core cables, do not use
spade terminals. Directly connect
single-core cables to the terminal block as
shown in the diagram below. Overheating
may occur at contacts.
Cable Tie
1. Tie cables together as shown
below with cable ties.
2. Tie cables together and
separate them from the pipes,
compressor, other parts, and
metal frame.
Fold up cables and retain adequate
length for service to prevent
removing cables from the
terminal.
Power cable
Pipe cove
r
Condui
t
＊ Precautions for Conduits
When using conduits,
prevent conduits from
entering the outdoor unit.
This may risk contacting
the compressor or
circulation pipes to cause
damage.
Terminal Bloc
k
(TB1)
Power cable
(AC 1Φ 230V)
Indoor-outdoor
cable (DC 5V).
Terminal Bloc
k
AC 230V
AC 230V
Indoo
r
-Outdoo
r
DC 5V
Indoo
r
-Outdoo
r
DC 5V
Terminal Bloc
k
(2) Wiring connection port
□1) Please assemble the indoor unit wiring connection port according to the indoor unit installation manual instruction.