Hot Water Quality - elco TRIGON L Operating Manual

Heating Water Quality
Heating Water Quality
Both the composition and the quality
of the system water directly affect the
performance of the complete system
and life cycle of the boiler.
For first filling and subsequent supply
to the system, you can generally use
tap water of a pH value of 7-8 unless
it is very corrosive (chloride content
> 150 mg/L) or very hard (> 14°dH;
hardness range IV). You can obtain
drinking water analyses from the
competent water supply works.
If specific system volume is higher
than 20 litres/kW heating power
(if any heating water buffer tank
is incorporated, for instance), the
maximum admissible lime feed by
the filling and supply water should
be determined by the calculation
procedure indicated in VDI Directive
2035. If necessary, the filling water
should be softened. Do not use any
chemical corrosion protection agents.
Criterion
pH value
Hardness degrees
Chloride content
4
For Austria, ÖNORM H 5195-1 is
also applicable.
For Switzerland, the directive
SWKI BT102-01 applies.
Unknown water quality and
substitution systems
The heating water often contains
substances and additives which
affect function and life cycle of the
Thermo unit.
Therefore you should either:
heat up the old system and
completely discharge it prior to
replacing the system or
carefully flush the heating system
prior to replacing the system.
System flush will be most efficient
directly prior to first heating up.
Permissible Value Effect upon Deviation
7 - 8 Risk of corrosion for boiler components and heating system
< 14 dH / < 25 fH - increased lime depositing
- low life cycle of boiler
< 150 mg/l Corrosion of alloy materials
Floor heating
You can directly connect floor heating
when pipes are sealed against
oxygen.
You usually have to build in a
temperature controller for the floor
heating system to prevent the pipes/
floor coverings from overheating.
If you do not know the model of floor
heating (when systems are replaced,
for instance) you have to install
a separating device between the
systems of boiler and floor heating
using a heat exchanger (option).
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