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COMMISSIONING
5.
Commissioning
5.1
Setting the control
Please use the operating instructions for setting the heat-
ing curve.
5.2
Water quality
The TopGas
®
condensing boiler (35,45,60) 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 refill
-
ing is necessary)
must be equipped with
separate circuits
.
•
Treated heating water must be tested at least 1x yearly,
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 ad-
equately 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 200 mg/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.
5.3
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 desalinat-
ed 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 val-
ues given in the
table 1
should not be exceeded (de-
pendent on boil er performance ratings - for multi-boiler
plants rating of smallest boiler applies - and on the wa-
ter 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.
Table 1: Maximum filling capacity based on VDI 2035
Available for boiler with < 0,3 l/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.
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