Filling The Heating System And Checking The Supply Of Ventilation Air; Checking The Power Supply; Changing The Language (If Required) - Viessmann VITOCROSSAL Service Instructions Manual

Filling the heating system and checking the supply of ventilation air

!
Please note
Unsuitable fill water increases the level of
deposits and corrosion. Corrosion can cause
damage to the boiler.
Only use suitable fill water.
Flush the heating system thoroughly before filling.
■
For water quality requirements, see page 102.
■
■ Only use fill water of potable water quality.
■ Fill water must be softened in accordance with the
requirements of VDI 2035, e.g. with a small softening
system for heating water. See water quality require-
ments on page 102 104.
Vitoset pricelist
■ Special antifreeze suitable for heating systems can
be added to the fill water. The antifreeze manufac-
turer must verify its suitability, as damage to gaskets
or diaphragms and noise during heating operation
may otherwise occur.
Viessmann accepts no liability for any resulting dam-
age or consequential losses.
1. Check whether the ventilation air supply is unre-
stricted.
2. Check the pre-charge pressure of the expansion
vessel when the system is still cold.
Note
If the pre-charge pressure of the expansion vessel
is lower than the static system pressure, top up
with nitrogen until the pre-charge pressure is 0.1 to
0.2 bar (10 to 20 kPa) higher than the static system
pressure. The static pressure corresponds to the
static head.

Checking the power supply

Changing the language (if required)

Only for weather-compensated control units
At the commissioning stage, the display is in German
(factory setting).
Extended menu:
1.
å
2. "Settings"
3. "Language"
4. Set the required language with / .
Commissioning, inspection, maintenance
3. Open any installed check valves.
4. Fill the heating system with water and vent until the
charge pressure is 0.1 to 0.2 bar (10 to 20 kPa)
higher than the pre-charge pressure of the expan-
sion vessel.
Permiss. operating pressure: 6 bar (0.6 MPa)
Minimum operating pressure: 1 bar (0.1 MPa)
Note
The minimum operating pressure is essential for
safe operation.
5. Record the fill volume, water hardness and pH
value in the table on page 104.
Note
Observe the "Water quality requirements" on
page 102.
6. Return the check valves to their operating position.
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