Hoval TopGas 80, Installation Instructions Manual

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COMMISSIONING
5. Commissioning
5.1 Setting the control
Please use the operating instructions for setting the hea-
ting curve.
5.2 Water quality
The TopGas
®
condensing boiler (80) is only
suited for closed hydraulic systems.
5.2.1 Heating water
The European Standard EN 14868 and the Directive VDI
2035 must be observed. In par ticular, attention must be
paid to the following stipulations:
Hoval boilers and calorifiers are designed for heating
plants without significant oxygen intake (plant ty pe I ac-
cording to EN 14868).
Plants with
- continuous oxygen intake (e.g. underfloor heating
systems without diffusion proof plastic piping) or
- intermittent oxygen intake (e.g. where fre quent refil-
ling is necessary)
- frost protection in heating water
must be equipped with separate circuits .
Treated heating water must be tested at least 1x year -
ly, according to the inhibitor ma nu facturer‘s instructions,
more frequent testing may be necessary.
A refilling is not necessary if the quality of the heating
water in existing installations (e.g. exchange of boiler)
conforms to VDI 2035. The Directive VDI 2035 applies
equally to the replacement water.
New and if applicable existing installations must be ade-
quately cleaned and flushed before being recharged! The
boiler may only be filled after the heat ing system has
been flushed.
Parts of the boiler which have contact with water are
made of aluminium.
On account of the danger of spot corrosion the chloride,
nitrate and sulfate contents of the heating water must not
exceed 200mg/l in total.
The pH value of the heating water should lie between 8,0
and 8,5 after 6 - 12 weeks of heating operation.
5.2.2 Filling and replacement water
For a plant using Hoval boilers untreated drink ing wa ter
is generally best suited as fil ling and replacement water.
However, the qual ity of the untreated drinking water must
at least fulfil the standard set in VDI 2035 or be desalina-
ted and/or be treat ed with inhibitors. The stipulations of
EN 14868 must be observed.
In order to maintain a high level of boiler effi ciency and
to avoid overheating of the heati ng surfaces the values
given in the table 1 should not be exceeded (dependent
on boil er performance ratings - for multi-boiler plants ra-
ting of smallest boiler applies - and on the water content
of the plant).
The total amount of filling and replacement water which
is used throughout the total ser vice life of the boiler must
not exceed three times the water capacity of the plant.
Boilers with aluminum: generally inhibitors may be filled
in only by a specialized company.
If possibly a reduction of the water hardness we recom-
mend a complete desalination (no softening) with bypass,
so that the sum of the alkaline-earths in the filling water
remains of approx. 0,5 mol/m
3
. During the filling procedu-
re the conductance of the filling water should be super-
vised. This should be to approx. 100yS/cm.
After filling the conductance of the plant water should be
Table 1: Maximum filling capacity based on VDI 2035
Available for boiler with < 0,3l/kW water capacity
Total hardness of the filling water up to.....
[mol/m
3
]
1
<0,1 0,5 1 1,5 2 2,5 3 >3,0
f°H <1 5 10 15 20 25 30 >30
d°H <0,56 2,8 5,6 8,4 11,2 14,0 16,8 >16,8
e°H <0,71 3,6 7,1 10,7 14,2 17,8 21,3 >21,3
~mg/l <10 50,0 100,0 150,0 200,0 250,0 300,0 >300
Conductance
2
<20 100,0 200,0 300,0 400,0 500,0 600,0 >600
Boiler size of the
individual boiler
maximum filling quantity without desalination
up to 28 kW NO DEMAND 50 l/kW 20 l/kW
30 to 50 kW 50 l/kW 50 l/kW 20 l/kW 20 l/kW 20 l/kW
50 to 200 kW 50 l/kW 20 l/kW 20 l/kW always desalinate
1
total of alkaline earths
2
If the conductance in µS/cm exceeds the tabular value an analysis of the water is necessary.