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In order to get access to the electrical box:

1. remove the front part of the unit, twist off the screws placed on the sides (using a suitable long screwdriver, it is

possible to do it frontally to the unit for any built-in installations or very close to the walls);

2. remove the metallic cover of the electrical box unscrewing the 4 screws;
3. the unit is already provided with a power supply cable connected to the electrical box. If it’s necessary to

disconnect it and to connect a longer cable, or if it’s necessary to connect an ON/OFF remote signal, please

refer to the wiring diagram.

The specification of the power supply cable is 3*1.5mm². The fuse protection specification is 16A 250V.
There must be a switch when connecting the unit to the power system. The current of the switch is 10A.
A creepage breaker must be installed near the power supply and the unit must be effectively earthed. The specification

of the creepage breaker is 30mA, less than 0.1sec.
The remote ON-OFF contact is located in the bottom part of the unit inside the box from which the resistance and the

safety thermostat can be accessed. See paragraph 2.4.4.

3.9 START UP

Before start-up:

•  check out the availability of the supplied wiring diagram and manual of installed apparatus;
•  check out the availability of the electrical and hydraulic diagram of the plant in which the unit is installed;
•  check out that all water connections are properly installed and all indications on unit labels are observed;
•  check the inlet water pressure, make sure that the pressure is sufficient (above 1,5 bar);
•  check that the shut-off valves of the hydraulic circuit are open;
•  verify that the hydraulic circuit has been charged under pressure and air vented;
•  check if any water flows out from the hot water outlet, make sure that the tank is full of water before turning on the

power;

•  ensure that arrangements have been provided to drain the condensate;
•  check out the electric connections;
•  check that electrical connections are carried out according to the norms in force including grounding;
•  make sure that the voltage is within the limits (± 10%) of tolerance range respecting the value indicated on the

technical label;

• check out that there is no refrigerant leakage;
• check out that all the cover panels are installed in the proper position and locked with fastening screws before start

up;

• check the unit; make sure that everything is ok before turning ‘ON’ the power of the unit, check the light on the wire

controller when the unit runs;

• use the wire controller to start the unit;
• listen to the unit carefully when turning ‘ON’ the power of the unit. Turn the power ‘OFF’ when you hear an abnormal

sound;

• measure the water temperature, to check the undulation of the water temperature;
• once the operation parameters have been set (only by by qualified person, you cannot do it by yourself), the user

cannot change the parameters optionally. Please contact a qualified service person for setting parameters if it is

necessary.

WARNING: Never switch off the unit (for a temporary stop) by switching off the main switch:

this component should be used to disconnect the unit from the power supply only for long

stoppages or maintenance/repairing operations.
WARNING: Do not modify the internal wiring of the unit otherwise the warranty will terminate

immediately.