ENGLISH
6.3.4 Power and transmission wiring connection
Safety instructions
?
N O T E
Check the requirements and recommendations in the chapter
“5 ELEC-
TRICAL AND CONTROL SETTINGS”.
!
D A N G E R
•
Do not connect the power supply to the indoor unit prior to filling
the space heating circuit (and DHW circuit if it were the case)
with water and checking water pressure and the total absence of
any water leakage.
• Do not connect or adjust any wiring or connections unless the
main power switch is OFF.
• When using more than one power source, check and ensure that
all of them are turned OFF before operating the indoor unit.
• Wait for 3 minutes after switching off the power of the unit before
any electrical work. This is necessary to ensure the discharge of
internal capacitors in order to avoid electrical shock.
• Check to ensure that the indoor fan (inverter box) and the outdoor
fan have stopped before electrical wiring work or periodical
check is performed.
• Avoid wiring installation in contact with the refrigerant pipes,
water pipes, edges of plates and electrical components inside
the unit to prevent damage, which may cause electric shock or
short circuit.
!
C A U T I O N
• Use a dedicated power circuit for the indoor unit. Do not use a power
circuit shared with the outdoor unit or any other appliance.
• Make sure that all wiring and protection devices are properly selected,
connected, identified and fixed to the correspond ing terminals of
the unit, specially the protection (earth) and power wiring, taking
into account the applicable national and local regulations. Establish
proper earthing; Incomplete earthing may cause electrical shock.
• Protect the indoor unit against the entry of small animals (like rodents)
which could damage the drain pipe and any internal wire or any other
electrical part, leading to electric shock or short-circuit.
• Keep a distance between each wiring terminal and attach insulation
tape or sleeve as shown in the figure.
Tape or sleeve
Connection procedure
Access to the electrical box before performing the next steps:
1
Using the appropriate cable, connect the power circuit to the
appropriate terminals as shown on the wiring label and the
illustration below. Connect the power supply cables L1 and N
(for 230V 50Hz) or L1, L2, L3 and N (for 400V 50Hz) to the
terminal board (TB1) , and the earth conductor to the earth
screw in the electrical box plate.
TERMINAL BOARD 1 (TB1)
TB1 (3N~)
TB1 (1~)
Power
terminals
Earth terminal
2
Connect the transmission wires between outdoor and indoor
unit to the terminals 1 and 2 on the terminal board 2 (TB2).
1
1
2
2
Indoor unit
Outdoor unit
3
Carry out the necessary electrical connections of the optional
accessories using the terminal board 2 (TB2). Consult its
label for a better understanding.
?
N O T E
Refer to the section
“5.5 Optional indoor unit wiring (accessories)”
.
4
Pass the electrical wiring from the TB1 and TB2 to the upper
holes of the electrical box. Then, fix the cables to the cord
bands located at the right or left side. Afterwards, route the
cables through the back side of the unit and take them out
through the holes of the rear side of the indoor unit.
Cord bands
UNIT INSTALLATION
PMML0340B rev.1 - 03/2016
27
