Operating Instructions and Installation Instructions

VARINO GRANDE 350 - 600

We reserve the right to make changes to dimensions and construction 20 Edition 10.07.2015

7. Operating conditions

7.1. Fuel

This condensing boiler was set in the factory to operate using the gas specified on the gas setting label.

IMPORTANT: Please refer to chapter 6.8 for use with any other type of gas.

Important: The use of other gases such as for instance biogas is not permitted.

7.2. Combustion air

The combustion air should not contain large amounts of dust.

The blower intake opening is provided with a label referring to this requirement. This label must be removed

before starting up the unit. The person who removes the label guarantees that the combustion air is free from

dust or that an air filter is fitted.

Furthermore, the combustion air must be free of halogens (chlorine and fluorine compounds). An excessive

presence of halogen in the combustion air leads to great corrosion damage. Make sure that no paints, thinners,

cleaning agents, degreasing agents, solvents, chlorine containers, etc. are stored in the boiler room!

7.3. Filling the installation and water quality

The installation must be thoroughly rinsed before it is finally filled.

When filling for the first time and refilling, check the quality of the water in accordance with the values

recommended in chapter 4.2. Poor water quality leads to damage in heating installations from calcification and

corrosion. On the other hand, the service life, functional reliability and efficiency can be increased using

appropriately treated water.

During the filling process, the circulation pumps should be switched off and all ventilating valves opened, so that

the air in the system can completely escape. The filling process is finished when the operating pressure has

been reached.

7.4. Requirements for operation

The maximum operating pressure and the minimum and maximum temperatures to be observed are listed

in chapter 4.1.

Never switch off the mains voltage except for maintenance work on the control panel. The oxygen sensor must

always be heated, even during summer operation (otherwise there is a risk of condensation forming inside the

sensor).