Hitachi RCD-0.8FSN3 Installation And Operation Manual page 31

ELECTRICAL WIRING
17.2.3 Position of electrical wiring connection
!
D A N G E R
• Ensure that the wiring terminals are tightened securely with the
specified torques. Loose terminals may cause heart generation
at the terminal connection part, a fire or an electric shock.
• Fix the cables securely. External forces from the cables applied
on the terminals could lead to heat generation and a fire.
• Make sure that the wires are securely fixed in order not to apply
an external force to the terminal connections of the wirings. If
fixing is not completed, heat generation or a fire will occur.
The electrical wiring connection for the indoor unit is shown
in the item
"17.2.4 Details of electrical wiring connection"
details of the intermediate connection between the indoor unit
and the air panel.
1 The connections at the terminal block for the indoor unit
are shown in the figure below. Check the outdoor unit to
be combined before wiring work. The tightening torque for
terminals is shown in the table below.
Screw size
TB1 M4
TB2 M3.5
Terminal board for power source
cable TB1 (black)
-
R/L1 S/N
?
N O T E
When using the standard wire for field-wiring connection, M4
crimping terminal is required. When using the single wire, make it into
the shape shown in the figure below before connecting it in order to
tighten the washer uniformly.
Connect it with
crimping terminal
Stranded wire
2 Connect the cable for the optional remote control switch
or the optional extension cable to the terminals inside the
electrical box through the connecting hole in the cabinet.
3 Connect the power supply and the earth wires to the
terminals in the electrical box.
4 Connect the wires between the indoor unit and the outdoor
unit to the terminals in the electrical box.
5 Tie the wires together with the cord clamp inside the
electrical box.
27 PMML0425A rev.0 - 02/2016 - P5415720
for
Tightening torque for
terminals
1.0 - 1.3 (Nm)
1.2 (Nm)
Terminal board for control cable
TB2 (white)
A B 1 2
Connect it direct
as shown below
Single wire
6 Perform wiring work for the indoor unit according to the
electrical wiring diagram and the technical documentation of
the outdoor unit.
7 In case that power source is applied to control line. If the
power source is applied to the control line (Terminal 1 and 2
of TB2) by mistake, the fuse on the PCB for the control line
will blow out. In this case, take the following measure.
a. Reconnect the wirings correctly.
b. Set pin 1 of DSW7 (on PCB) to ON side.
c. Then PCB recovers from the fuse blowing out. However,
if the power source is applied to the control line again,
PCB will break and not be able to recover.
R S –
L1 N
1~ 230V 50Hz
5V
Incorrect wiring
R S –
L1 N
1~ 230V 50Hz
5V
Reconnect wirings correctly
!
C A U T I O N
• Connect the cables correctly according to the marks and numbers
on terminal block.
• Install the transition wiring between indoor units connected to the
same outdoor unit.
• Do not connect the main power source cables to the control line
(Terminals A, B, 1 and 2 of TB2). If it is connected, the printed
circuit board (PCB) will be broken.
• Comply with the following points when connecting wires to the
terminal block:
- Attach an insulation tape or a sleeve to each terminal.
- Make sure that the terminals are not too close to the
electrical box, to prevent a short circuit.
- Make sure that the terminals are not too close to each other.
Attach an insulation tape or a sleeve to each terminal.
(B)
A B 1 2
PCB
DSW7
A B 1 2
ON
OFF
1 2
Set Pin 1 at
ON side
(C)
Screw
Screw
(A)