15.3 Removal and fitting
15.3 Removal and fitting of the case Servicing A A Removal of the case - undo the 4 case retaining screws (Fig. 15.2) - disengage the clips - remove the case A A A FIG. 15.2 A detail Fitting the case Remove the protective film from the front and rear of the case - position the case (Fig. 15.3) - engage both clips in the case (see detail) - fasten the 4 retaining screws A on the front A A FIG. 15.3 Servicing To maintain the unit, it is possible to move the electrical box without having to disconnect it. The electrical box is clipped onto the heating outlet pipe or onto the bottom of the chassis. (Fig. 15.4) 36 FIG. 15.4
15.4 Pressurisation (fig. 15.5) Domestic hot water circuit - open cold water tap 40 - drain the hot water tank and appliance by drawing off from the various hot water taps. Heating circuit - check that the heating outlet tap 41 and heating return tap 42 are fully open - open the filling taps 43 and 44 - close these taps when the needle of the pressure gauge 37 (under the door of the electrical unit cover) reaches the pressure set in § 3 - drain the appliance and re-establish the pressure Gas circuit - open the gas tap 39 - flush the gas circuit - check the sealing over the whole gas circuit 39 42 40 41 43 44 45 Fig. 15.5 WARNING : It is very important to fully bleed the main heat exchanger of air when filling the boiler. You must continue to bleed the heat exchanger from pump through the automatic air vent, through several central heating and hot water cycles to ensure the air is fully bled from the system. Refer to the installation manual for detailed guidance. Failure to adequately bleed the boiler may damage the appliance and invalidate the warranty. 15.5 Commissioning (fig. 15.6) - press the on/off button ON/OFF 26 on the control panel and turn selector 32 to the “winter” operating mode. The boiler pump will start up and three attempts will be made to ignite the burner (display S01, then S02. After the third attempt, the electronic control unit will shut the appliance down as the gas supply has been cut off; the warning light 30 comes on and “A01” appears on the display. - leave the pump running until all the air has been exhausted from the appliance. - bleed the air from the radiators - open the Domestic hot water circuit to eliminate all the air from it - check the appliance pressure, and if it has fallen, add water to bring it back to 1 bar. - check the exhaust gas evacuation duct. - check that the ventilator inlets for the room are fully open (type B appliances). 6. Reset the boiler by pressing the button RESET 27. The burner comes on. If the first attempt fails, the gas pipe must be purged; repeat the operation until the burner ignites. ON/OFF 26 27 COMFORT 30 32 33 RESET Fig. 15.6 37
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