34
Filling and venting the heating system
!
Please note
Unsuitable fill water increases
the level of deposits and corro-
sion and may lead to boiler
damage.
■ Flush the heating system thor-
oughly before filling.
■ Only use water of potable
water quality. The total con-
centration of calcium Ca
2+
and
magnesium Mg
2+
in the fill
water must not exceed
450 mg/l.
■ In areas with water hardness
> 450 mg/l a water softening
system must be installed.
■ Softening systems for heating
water are available from
Viessmann.
■ The pH value of the fill water
should be between 6.5 and
8.5.
■ Special antifreeze suitable for
heating systems can be
added to the fill water. The
antifreeze manufacturer must
verify its suitability.
■ When using a means of water
treatment, always use prod-
ucts from the following manu-
facturers:
– Fernox (www.fernox.com)
– Scalemaster (www. scale-
master.co.uk)
– Calmag (www.calm-
agltd.com)
– Sentinel (www.sentinel-solu-
tions.net)
1. Check the pre-charge pressure of
the diaphragm expansion vessel
(see page 53).
2. Close the gas shut-off valve.
3. Turn ON the system ON/OFF
switch on the control unit.
Commissioning, inspection, maintenance
Further details regarding the individual steps
5837146
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