Table of Contents
Advertisement
4 Installation
4
Installation
4 .1
Installation instructions
10
HFS 650 / HSF 700
All aspects of the installation must be carried out in accordance with the
current regulations for work performed and technical systems in private,
public or other buildings.
Attention
The installation must be carried out in accordance with the current
regulations, best practices for technical work, and the instructions in
this manual.
4 .1 .1 Domestic water quality
Self-cleaning effect
Boilers with corrugated stainless steel coil for heating of domestic water
are insusceptible to deposits of pure lime (pure calcium). Pressure
differences in the pipe during opening and closing of the taps cause
pressure surges in the corrugated stainless steel coil. This causes the coil
to stretch slightly and then contract again.
These movements in the coil are sufficient to cause 'normal' lime deposits
(calcium) to flake off. The dissolved lime is flushed away when a tap is
opened.
Attention
This self-cleaning effect of the corrugated stainless steel coil in HFS
boilers is no longer sufficient when in addition to the lime (calcium)
there are also other substances such as free carbonic acid and
magnesium present in the water. When lime and free carbonic acid
are present in the water, these substances react to form 'scale'.
The presence of magnesium in the water at a filling temperature
> 60 °C promotes the formation of scale.
Boiler scale, in contrast to lime, is not broken loose by the self-
cleaning effect of the corrugated stainless steel coil but rather forms
larger deposits. When the pressure is relieved from the corrugated
stainless steel coil in the boiler, during maintenance for example,
boiler scale in solid form may break loose and clog the coil (heat
exchanger).
For domestic water containing these substances, the corrugated stainless
steel coil must be inspected regularly and decalcified with a softening
agent as necessary or a decalcification system must be installed in the
cold water supply line of the HFS domestic water boiler.
7651255 - v.01 - 23052016
Advertisement
Table of Contents
