Manuale d’istruzione Sez.7 All. 9 Rev. 3 del 25.07.2013 24WATER FILLINGOnce the hydraulic connections have been completed, proceed to fill the system. Inorder to do this it’s necessary to open the filling cock until the index of the hydrometer,placed at the bottom of the front panel, reaches 1. While performing, it is recommendedto vent indoor air through the vent valve Jolli placed under the cover of the furnace andthrough the vents of the radiators. This operation must be done when the system isstationary (switched-off furnace). Once the system has been vented and reached thepressure indicated, it is possible to power on the furnace. We advise you to checkperiodically that the pressure is always between 0,5 and 1,2 of hydrometric graduation.IMPORTANT:If pressure is subject to increase or decrease it’s best to find the cause and restore it.TOO LOW PRESSURE: open the filling cock until desired pressure is reached. (max 1bar).TOO HIGH PRESSURE: drain a bit of water from the safety valve (you must dismantlethe right panel to find it at the bottom of the stove) turning the knob until the desiredpressure is reached (max 1 bar) and then replace the safety valve in the originalposition. Stove safety valve is calibrated at 3 bar; alternatively drain the water throughthe air vent valve of the radiators.WARNING:1 Let the water circulate for a few minutes in order to obtain a total air vent through vent valveJolli. To facilitate this, the pump should be operated at intervals of 10 seconds by turning theswitch.2 Check the pressure up on the hydrometer: if decreased it must be restored between 0,5 andthe max 1 bar through the filling cock.3 All heating objects should be provided of a vent valve.4 Do not operate the pump with the furnace empty.5 If unit is not completely vented, the furnace won’t be able to work.