CombiSteel 7480 Serie Mode D'emploi page 8

N.B. The cable gets voltage from the unit switchboard: do not connect it to an external supply.
Door heater cable (only on the low temperature units): is prepared to supply the anti-freezing heater that usually
lies inside the door gasket as concerns the cold rooms working at low temperature. It can be used to supply the
eventual compensation valve provided with the unit as well: the important thing is not to exceed the peak load
that the cable can bear equal to 200 W. To execute the connection is necessary to respect the polarities.
N.B. The cable gets voltage from the unit switchboard: do not connect it to an external supply.
Door micro switch cable (only on the units with electronic control panel): is predisposed for the connection of
an eventual micro switch that the user has to install on the cold room door. During the connection it is possible
to work things in such a way that the electronic control panel operates automatically the light switching on and
the stop of the fans or of the whole unit, when the cold room door is opened. It is also possible to select these
functions through the programming of the parameters of the electronic control panel. The two poles of the cable
are to be connected to the micro switch contact that is closed when the door is closed. If no micro switch is
connected, the two wires have to remain connected to each other as delivered. In the Split and Bi Block units
there is not the cable coming out of the unit, however the electronic control panel is predisposed for the
connection.
N.B. The cable gets voltage from the unit switchboard: do not connect it to an external supply.

Condensing Units: On the terminal board lying on the back side of the electric switchboard, there is the
possibility to install a thermostat (or any other instrument) that controls the unit working; to execute
this connection act as follows:
Remove the fixing screws of the front side (fig. 4-7), take the front side off after having disconnected
the ground wire (fig. 4-8), remove the fixing screws of the electric switchboard (fig. 4-9), take the
switchboard off its proper place (fig. 4-10), place the switchboard carefully laying it on the front side so
as to manage to approach the protection fixed on the back (fig. 4-11), remove the screws fixing the
protection (fig. 4-12), take the plastic protection off and remove the bridge between the terminals
marked with the letters "ne" (fig. 4-13) and, instead of it, connect the thermostat contact. Repeat all
the operations in the opposite order till the beginning conditions are restored. In some models, above
all of the Horizontal condensing units, the terminal board is inside the electric switchboard.

Evaporating units: See what is described as concerns the connection of the evaporator of the Split
models.
The connection of the unit supply cable has to be made respecting the colour of the wires.
If the supply provides for the remote control panel, this is delivered with the cable and already connected. If, in
case of not standard supplies, the control panel is not connected, the connections have to be executed respecting
the wiring diagram and the numerations of the terminals and of the wires.
N.B. To limit the damages due to electrical noises, we suggest placing the cold room cable, the remote control
panel cable and the probe cable as far as possible from the cables with a high power; anyway prevent the above-
mentioned cables from crossing the power ones. If the unit is supplied by a power generator, make sure that the
signal is perfectly sinusoidal: a square wave could cause noises which can damage the electronic instrument.
Every time you connect an evaporator or a remote control panel, a ground connection is to be executed; for this
purpose near the terminal boards there is a screw or a terminal with the symbol
has to be linked.
The ground connection of the unit is compulsory. Furthermore the unit has to be included in an equipotential
system. The connection is done by a terminal marked with the symbol
in the unit.
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to which the ground cable
set near the entrance of the line cable
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