29
Automatic flue gas temperature sensor check
The display shows:
"Er"
If the flue gas temperature sensor is not positioned
correctly, fault message 416 appears.
For further details regarding the flue gas temperature
sensor test, see "Repairs".
If fault message 416 appears, reposition the flue gas
temperature sensor in the flue gas connection. Check
for leaks on the flue gas side.
Note
The burner remains locked out until the test has been
passed.
When the fault has been remedied, turn the ON/OFF
switch off and back on again.
Filling the heating system
Fill water
As a heat transfer medium for DHW heating, the heat-
ing water must meet fluid category ≤ 3. This require-
ment is met if water of potable quality is used as heat-
ing water. For example, if additives are used, the addi-
tive 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 use fill water of potable water quality.
■
Special antifreeze suitable for heating systems
can be added to the fill water. The antifreeze
manufacturer must verify its suitability.
■
Fill and top-up water with a water hardness in
excess of over 300 ppm must be softened,
e.g. with a small softening system for heating
water.
Checking all connections on the heating water and DHW sides for leaks
Danger
Risk of electric shock from escaping heating
water or DHW.
When commissioning and after carrying out
maintenance work, check all water side connec-
tions for leaks.
Venting the heating system
Note
If the heating system has not been completely vented,
the heating water flow rate can be too low. This can
lead to the burner being switched off by internal safety
equipment before the specified set boiler water tem-
perature is achieved.
1.
Close the gas shut-off valve and switch the appli-
ance ON.
2.
Activate the venting program (see commissioning
assistant or following chapter).
3.
Adjust the system pressure.
The display shows the system pressure.
■
Sealed unvented heating system:
Adjust the operating pressure to
≥
0.8 bar using
the fill valve.
■
Open vented heating system:
The static head must be at least 0.2 bar.
4.
Disconnect the supply hose from the boiler drain &
fill valve.
5.
Open the gas shut-off valve.
Commissioning, inspection, maintenance
Commissioning the system
(cont.)
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