CIAT MAJOR LINE 102A Manuel D'instructions page 42

Circuit diagrams for customer applications should be based on the diagrams supplied:
● Wiring the unit in 2 pipe or 4 pipe configuration with asynchronous motor (fig. 9a)
or on/off brushless motor (fig.9b) /0-10V (fig.9c).
● Wiring the unit in 2 E + Electrical configuration with 1 or 2 heating resistors output
P<3000 W with asynchronous motor (fig. 10a) or on/off brushless motor (fig. 10b)
/0-10V (fig.10c). For a P>3000 W version, please contact us.
CIAT recommends using a system that controls the unit in relation to the temperature
of the water (to actuate the valve or valves) and the electric heater.
All electrical connections are fed into the electrics box marked with the symbol
The electrics box is equipped with a cable grommet to facilitate the routing of the
cables to the terminal block.
To access the electrical terminal block:
Disconnect the unit from the electrical power supply.
!
Dismantle the casing (fig. 4) for a CV/CH unit.
Remove the screw from the electrics box enclosure (fig. 14b).
Modifying the motor speeds:
Always use an electrician's flat-blade screwdriver when performing cabling operations.
Major Line offers a choice between two types of motor technology: asynchronous
and brushless (low consumption).
● The asynchronous motor:
To optimise the unit's performance and depending on the type of control used, the
unit has five speeds numbered V1 to V5 connected to the terminal block in the
electrics box (V1= low speed and V5= high speed).
The customer must wire the speeds for the thermostat at the top of the terminal block
between V1 and V5.
To open a connection point and change the cabling (fig.14c).
- Place the end of a flat-blade screwdriver in the hole located just below the cable
to be removed, release the cable and move it to the marker for the desired speed.
- Place the screwdriver back in the hole just below the desired speed, insert the cable
and remove the screwdriver; this ensures a secure contact.
Repeat the procedure for the remaining customer speeds.
WARNING: the wires coming from the motor and connected to terminals V1 to
V5 must never be interconnected.
WARNING: it is essential to refit the electrics box enclosure once all the cabling and
adjustment operations are complete.
● The brushless motor:
This has a motor speed electronic control unit which uses a 0-10 V control signal or
3-speed on/off control (to be selected by the customer depending on the controller or
thermostat used with the unit).
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