Doc653/30CV02A
21
Very soft
‹ 50 ppm
Soft
50-160 ppm
Moderately hard
160-250 ppm
Hard and very hard
‹ 250 ppm
w
The system should contain soft to medium hard water, with the water hardness that does not
exceed 250 ppm at a fl ow temperature of 80°C and ∆t 20 K.
Before supplying water, the hardness and chloride value of the system water should always be
determined.
y
The chloride value should never exceed 200 mg/l.
If the chloride value does exceed this value, the cause should be determined. Compare the
chloride value of the supply water and the central heating system water. If this content is much
higher, and if no materials containing chloride have been added, this indicates evaporation. If the
chloride content is very high, the water is rendered more aggressive. (Can be caused by, amongst
other things improperly regenerated water softener). The system should be fl ushed clean and
fi lled with low chloride water.
In order to counter unnecessary wear and tear and blockages due to impurities present in the sys-
tem, we recommend the use of a fi lter system with a mesh size of 100 microns. Always place this
in the return line of the secondary part of the system.
In order to guarantee a properly working system and long life, one should remove suspended and
corrosive particles by installing a suitable fi lter system.
The periodic inspection including the analysis of the system water and the cleaning of the fi lters
should be performed.
If it is intended to add any chemicals (such as inhibitors) to the water, please fi rst contact Stokvis.
They can also give you advice concerning fi lter systems and other requirements. (Water analysis
forms can be obtained from your supplier).
6 Operating instructions
6.1 Operation
The fan, which is modulated by the temperature controller, supplies the combustion air. Due to
the resultant under pressure in the venturi, the zero pressure controller in the gas valve mixes in
the required quantity of gas. Gas and air are completely mixed in the venturi.
The gas-air mixture is then fi red directly in the burner. The fan also removes the combustion
gases. The boiler has no lower limit to the return water temperature. If this temperature is low,
condensate will be formed, which is removed via the discharge system.
6.2 Controls
Depending on the heat requirement of the boiler, the load should be modulated between 14% and
100%. Below 14% load, the boiler operates on/off, based on temperature.
Summary of Contents for ECONOFLAME R30
Page 35: ...Doc653 30CV02A 31...
Page 36: ...32 Doc653 30CV02A...
