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UNIT INSTALLATION
5.2.2 Power and transmission wiring connection
◆
Safety instructions
NOTE
Check the requirements and recommendations in the chapter
"4. Electrical and control
settings".
!
DANGER
• 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.
• Avoid wiring installation in contact with the water pipes,
edges of plates and electrical components inside the unit to
prevent damage, which may cause electric shock or short
circuit.
!
CAUTION
• 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
PMML0599 rev.0 - 04/2022
◆
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 to the terminal board (TB1) ,
and the earth conductor to the earth screw in the
electrical box plate.
TERMINAL BOARD 1 (TB1)
Power terminals
Power terminals
Case 1. Power supply:
~ 230V 50Hz
2. Connect the transmission wires between outdoor
and indoor unit to the terminals 1 and 2 on the
terminal board 2 (TB2).
1
2
1
2
3. Carry out the necessary electrical connections of
the optional accessories using the terminal board 2
(TB2). Consult its label for a better understanding.
4. Pass the electrical wiring from the TB1 and TB2 to
the lateral holes of the electrical box. Then, fix the
cables to the cord bands located at the right side.
Finally, take the cables out through the bottom side
of the unit.
Earth terminal
Case 2. Power supply:
3N~ 400V 50Hz
Indoor unit
Outdoor unit
EN
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