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Maintenance
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41
Physical and chemical check
Check physical and chemical water
A er some weeks of opera on, check
the main phisicals and chemicals
parameters of water:
pH:
7,0 - 9,5
Hardness:
< 10 °fH
Electrical
Conduc vity
<150 μS/cm
Chlorides:
<50 mg/l
Sulphides
<50 mg/l
Nitrides
<50 mg/l
Iron
<0.5 mg/l
If the values are higher, it must be
used a suitable water treatment sys-
tem.
Water pressure and quality
Check if the water pressure and
quality meet the requirements.
Consult the chapter “commissioning:
water and hydraulic system” for
more detailed informa on.
Water ow rate
Check if the water ow rate through
the boiler is within the limits.
Consult the chapter “commissioning:
check water ow” for more detailed
informa on.
Combus on analysis
Check the combus on at full load
and minumum load, correct the set-
ngs if necessary. An addi onal ref-
erence check at 50% load is recom-
mended.
Consult the chapter “commissioning:
combus on analysis” for more de-
tailed informa on.
Gas pressure
Check the dynamic pressure of the
gas supply to the boiler, when the
boiler is running at full load. In case
of a boiler cascade, all boilers should
be running at full load. See technical
data for required values.
Gas ghtness check
Check the ghtness of all sealed
connec ons with an approved soap
or
electronic analyzer, for example:
• Test points;
• Bolt connec ons;
• Gaskets of mixing system, etc.
Safety devices
Check the func onality and the set-
ngs of all safety devices connected.
Consult the chapter “commission-
ing: Check func onality of safety de-
vices” for more detailed informa on.
39


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