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Connecting the outdoor
component
Proceed as follows to connect the
cable:
1. Remove the cover from the
unit.
2. Remove the side panel next to
the terminals.
3. Select the cable cross-section
according to the relevant
standards.
4. Feed both cables through the
edge protection rings on the
fixed connection panel.
Electrical connection diagram
Connections ML 261 to ML 521
Check all plugged and clamped
terminals to verify they are
seated correctly and making a
permanent contact. Re-tighten
as required.
CAUTION
5. Terminate the cables as shown
on the electrical connection
diagram.
6. Support the cable in the strain
relief and re-assemble the unit.
(Fig 12).
12
Connecting the outdoor unit
Outdoor
component
Indoor unit Mains cable
Earth conductor
Neutral conductor
Phase conductor
Reverse flow valve
rear
terminal
block
front
terminal
block
230 V~,
50 Hz,
L1 / N
/ PE
Control
conductor
Compressor contator
PE
NN
PE
3
2
3
PE
N
L L L
2
11
Control
conductor
Control
conductor
Fan motor
Neutral conductor
Phase
conductor
Connection ML 681
Outdoor
component
Indoor unit Mains cable
Neutral conductor
Phase conductor
Reverse flow valve
230 V~,
50 Hz,
L1 / N
/ PE
Control
conductor
Compressor contator
N
L1
PE
L
N
3
2
3
N
L
2
1
PE
1
PE
Control
conductor
Control
conductor
Earth conductor
Fan motor
front
terminal
block
Connecting the indoor unit
Make the connection as follows:
1. Open the air intake guard.
2. Unfasten the cover on the right
side and at the bottom right
rear (Fig 11).
3. Connect the unit to the
control cable from the outdoor
component (to be provided
by customer). See electrical
connection diagramOn the
ML 681 IT series, the terminal
block for the mains supply
and control contacts is located
behind the front cover.
4. Re-assemble the unit.
11
Connecting the indoor unit
front terminal block
control cable
from outdoor unit
Cover rear terminal block
supply voltage
from outdoor unit
Cover
21
21


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