Filling The Heating System - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Filling the heating system

According to EN 1717, as a heat transfer medium for
DHW heating, the heating water must meet fluid cate-
gory ≤ 3. This requirement is met if water of potable
quality is used as heating water. For example, if addi-
tives are used, the additive manufacturer must specify
which category the treated heating water comes under.
!
Please note
Unsuitable fill water increases the level of
deposits and corrosion and may lead to appli-
ance damage.
■ Flush the heating system thoroughly before
filling.
Only fill with water of potable quality.
■
■ Fill water with a hardness above 300 ppm
must be softened.
■ Special antifreeze suitable for heating systems
can be added to the fill water. The antifreeze
manufacturer must verify its suitability.
A C B
Fig. 14
01. Close the gas shut-off valve.
02. Switch ON the power supply.
Information on automatic testing of the flue
gas temperature sensor
The control unit automatically checks the function
of the flue gas temperature sensor as soon as the
power supply is switched on.
Whilst this happens, the internal circulation pump
is briefly switched off.
During the test, also switch off all external circula-
tion pumps in the system.
If the flue gas temperature sensor is positioned
incorrectly, commissioning is cancelled and fault
message A3 is displayed (see "Repairs").
C
Commissioning, inspection, maintenance
03. Tap MODE.
04. / repeatedly until CONFI flashes.
05. OK to confirm.
"P" is displayed in the l.h. display area. The r.h.
display area flashes.
06. Use / to select "12".
07. OK to confirm.
"1" flashes in the l.h. display area.
08. OK to confirm.
"0" flashes in the r.h. display area.
09. Use / to select "1".
10. OK to confirm.
Filling is activated. The boiler circuit pump is run-
ning; the 3-way diverter valve moves to its centre
position. This function terminates automatically
after 30 min or when the ON/OFF switch is turned
off.
11. Open shut-off valves
12. Open valves and fill the heating system. Mini-
C
mum system pressure
Note
Ensure that the safety valve does not respond
when you are filling the system. If the flow rate
through the safety valve becomes too high, water
may enter the combustion chamber.
13. Close valves .
C
14. Remove connection line between the two valves
. During operation, the connection must be
C
interrupted.
and (if fitted) .
A B
0.8 bar (80 kPa).
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