19
Subject to change without notice.
83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH Subject to change without notice.
Subject to change without notice.
83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
has shown that the safest, most reliable and fault-free
running is achieved with so-called low-salt operation.
VDI 2035 Part I provides important information and rec-
ommendations regarding scaling and its prevention in heat-
ing and domestic hot water heating systems.
VDI 2035 Part II primarily deals with the requirements
for reducing heating water corrosion in hot water heating
systems.
PRINCIPLES OF PART I AND PART II
The occurrence of scaling and corrosion damage in hot
water heating systems is low, if
- the planning, design and commissioning are carried out
properly
- the system is closed in corrosion terms
- adequately dimensioned pressure maintenance is inte-
grated
- the guide values for the heating water are complied with
- and regular servicing and maintenance are carried out.
A system log should be kept, in which the relevant planning
& design data is entered (VDI 2035).
DAMAGE THAT CAN OCCUR IN CASE OF FAILURE TO
COMPLY WITH THE ABOVE
- Malfunctions and the failure of components (e.g. pumps,
valves)
- Internal and external leaks (e.g. from heat exchangers)
- Cross-section reduction and blockaging of components
(e.g. heat exchanger, pipes, pumps)
- Material fatigue
- Gas bubbles and gas cushion formation (cavitation)
- Negative effect on heat transfer (formation of coatings,
deposits) and associated noises (e.g. boiling noises, flow
noises)
LIMESCALE – THE ENERGY KILLER
Filling with untreated drinking water inevitably leads to
the precipitation of all calcium as scale. The consequence:
limescale deposits form on the heat transfer surfaces of
the heating. Efficiency falls and energy costs rise. A rule of
thumb is that 1 millimetre of limescale deposit causes an
efficiency loss of 10 %. In extreme cases it can even cause
damage to the heat exchangers.
NOTE.
The control unit of the heating and heat pump
controller can be connected to a computer or
network using a suitable network cable, enabling
the heating and heat pump controller to be
controlled remotely from there.
If this is required, lay a shielded network cable
(category 6, with RJ45 connector) through the unit
during the electrical connection work and route it
through the front panel of the unit, parallel to the
existing control cable of the heating and heat pump
controller.
Close the unit's electrical switch box…
Attach the lower facing panel.
Flushing, filling and venting
the system
ATTENTION
The system must be absolutely free from air before
commissioning.
WATER QUALITY OF THE FILL AND MAKE UP WATER TO
VDI 2035
PART I AND II IN WATER HEATING SYSTEMS
Use of modern, energy-efficient heat pump systems
is becoming increasingly widespread. Their ingenious
technology enables these systems to achieve very good
efficiencies. The decreasing space available for heat
generators has led to the development of compact units
with increasingly smaller cross-sections and high heat
transfer capacities. This means the complexity of the
systems and the material diversity are also increasing, which
plays an important role especially with regard to their
corrosivity. The heating water not only affects the efficiency
of the system, but also the life of the heat generator and the
heating components of a system.
The guide values of VDI 2035 Part I and Part II must
therefore be complied with as minimum requirements for
proper operation of the systems. Our practical experience
