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ELECTRICAL CONNECTION
Connection instruction
Perform electrical connections in accordance with laws
and regulations in force in the country concerned.
Always disconnect the electrical power supply before
opening the unit.
• Before installing fan coil make sure the rated voltage of
the power supply is 230V - 50 Hz.
• Make sure that, in addition to supplying the working cur-
rent required by the fan coil, the mains electrical supply is
also able to supply the current necessary to operate other
household appliances present.
• Maximum current absorbed by hydronic cassette is report-
ed in TECHNICAL DATA TABLE.
Cassette connection
Cassette terminal board is configured for power, wall-mount-
ed control and valve connections, according to wiring dia-
grams reported in the installation manual.
The unit must always be earthed.
• Upstream of the unit, fit an Omni polar switch with mini-
mum contact distance of 3 mm.
• The minimum cross section of the electric wires is 0.75
mm
2
. Each terminal accommodates two wires of the same
cross-section (maximum 1.5 mm
Mutiple connection for hydronic cassette CHD
Unit
Size
CHD
506
606
706
809
909
1109
1209
Note
(1) Maximum number of unit of the same model and size, connectable to a single control
(2) Maximum number of units of different size or model connectable to a single control with SPB kit installation for each unit
(3) Maximum number of units of the same size and model connectable to a single control with a single SPB kit
*
Electric absorption of a single unit (A)
16
2
).
NS-NSW (1)
PS-PSW (1)
5
5
4
4
3
3
3
3
3
3
2
2
2
2
Electrical characteristic
• The motor is protected by a thermal contact integrated in
the winding. It stops the motor if overheating occurs and
starts the motor again automatically after it has cooled
down.
• The fan coil is provided with a terminal board for the con-
nection of the electrical feeding, for the fan speed control
and for the connection with the safety device
• The installer has to provide input connection through
access provided on the sides of the unit, fixing the wires
and taking care not to pinch them.
Multiple connection
To connect, respect the wiring diagrams in this booklet. Only
one fan coil can be connected to the control unit. To control
more than one fan coil with a single control unit, each appli-
ance must be fitted Kit SPB for multiple connection. Refer to
multiple connection wiring diagram and to the following table
Drain pump
On cooling mode, the electronic board installed on the unit,
controls and runs the condensate drain pump. A level con-
trol system inside the unit starts the drain pump. In case the
internal condensate level reaches the safety limit, the supply
of the water to the valve is stopped. The safety relay has a
deviation contact and allows a remote alarm signal.
MT-MTW (1)
AT-ATW (1)
5
2
4
1
3
1
3
1
3
1
2
1
2
1
Installation
SPB (2)
SPB (3)
Absorbtion*
15
6
15
5
15
4
15
4
15
4
15
3
15
3
0,4
0,5
0,7
0,67
0,69
0,92
0,93
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