Isolation Of The Hydraulic Connections - Alpha-InnoTec SWP Series Operating Manual

Part 2 of VDI 2035 also points out the reduction in total
salt content (conductivity). The risk of corrosion is far
lower if deionised water is used than is the case if the
system is operated with salty, i.e. softened water.
Even if the water has been softened beforehand, it
contains dissolved, corrosion-promoting salts, which act
as electrolytes due to the use of different materials in
the heating system and therefore accelerate corrosion
processes. This can ultimately result in pitting.
ON THE SAFE SIDE WITH LOW-SALT OPERATION
The problems listed above do not occur at all with
low-salt operation, as neither corrosive salts such as
sulphates, chlorides and nitrates nor alkalising sodium
hydrogen carbonate are in the heating water. The
corrosive properties of deionised water are very low
and in addition, fur cannot form in the boiler. This is the
ideal approach for closed heating circuits, in particular,
because low oxygen input into the heating circuit can
also be tolerated.
In general, when the system is filled with deionised
water, the pH value sets itself within the ideal range due
to „self-alkalinisation". If necessary, a pH value of 8.2
can be very easily alkalised by adding chemicals. In this
way, optimum protection of the entire heating system is
achieved.
MONITORING
Analytical recording and monitoring of the relevant
water values and the added active conditioning
substances is of decisive importance. Therefore, they
should be monitored regularly using appropriate water
test equipment.
ATTENTION
The drainage pipe must be connected to the
safety assembly before rinsing and filling the heat
circuit.
Thoroughly rinse heat circuit...
NOTE.
Rinse heat pump and heating circuit for about 5
minutes.
Fill heat circuit...
Bleed heat circuit.
14
Subject to change without notice | 83050900dUK – Translation into English of the original German operating manual | ait-deutschland GmbH
Isolation of the Hydraulic
Connections
NOTE.
Insulate the heat source and heat circuit accord-
ing to the standards and directives applicable lo-
cally.
Check leakproofness of all hydraulic connections.
Perform pressure test...
Insulate all connections, vibration isolation, connec-
tions and lines of the heat circuit and heat source.
Provide steam diffusion-tight heat source insula-
tion.