Inspection and maintenance
35
Condens 7000 F – 6720871560 (2019/11)
11.5
Checking the heating system operating pressure
NOTICE:
Risk of system damage due to thermal stress!
If the boiler is filled when hot, the resulting temperature stresses can
cause stress cracks. The boiler will then leak.
▶ Only fill the boiler when cold (the boiler temperature should not
exceed 40 °C).
▶ When the boiler is in operation, never fill it via the boiler DFV valve.
Instead, only use a WRAS approved filling method in the return.
▶ Observe the requirements for fill water.
NOTICE:
System damage due to frequent topping up!
Depending on water quality, the heating system may be damaged by
corrosion or scaling if you frequently need to top up the water (observe
the water quality log).
▶ Vent the heating system during filling.
▶ Check the heating system for leaks.
▶ Check the function of the expansion vessel.
▶ Immediately seal any leaks.
In sealed systems the pressure gauge needle must be within the green
marking.
The red needle of the pressure gauge must be set to the required
operating pressure.
Establish an operating pressure of at least 1.2 bar.
▶ Check the operating pressure of the heating system.
The operating pressure is too low, if the pressure gauge needle is below
the green marking.
Fig. 38 Pressure gauge for sealed systems
[1]
Red needle
[2]
Pressure gauge needle
[3]
Green marking
CAUTION:
Health risk through contaminated drinking water!
▶ Observe all country-specific regulations and standards regarding the
prevention of drinking water contamination.
▶ Water should be topped up via WRAS approved filling method.
▶ Vent the heating system via the radiator air vent valves.
▶ Check the operating pressure again.
The operating pressure can also be checked at the control unit via the
"Info menu" (e.g. display "P1.4" corresponds to 1.4 bar).
▶ Enter the amount of top-up water in the
"Water Quality Operator's Log".
11.6
Measuring the carbon dioxide content
▶ Insert the sensor into the core stream through the measurement port
in the flue.
▶ Make a note of the flue gas values.
The CO
2
value must be between 8.2% and 10.5% (with LPG:
between 9.8% and 10.8%) and the CO content in the flue gas must
be below 100 ppm air-free.
The following applies for
Denmark
:
▶ Take the O
2
values corresponding to the specified CO
2
values
(natural gas DK CO
2
rat.=12.0 vol. %) from Chapter 17.5, page 62.
11.7
Removing the burner
CAUTION:
Risk of burning due to hot surfaces!
Individual components of the boiler can become very hot even after
being shut down for a long time.
▶ Allow the boiler to cool down.
▶ If necessary, wear protective gloves.
NOTICE:
Risk of material damage due to improper maintenance/cleaning!
When removing the burner or when cleaning the boiler, the control unit
may be soiled or damaged.
▶ Cover the control unit before removing the burner or cleaning the
boiler.
NOTICE:
Do not detach or disconnect any other control cables, apart from
those specified!
Do not detach sealed joints!
▶ Shut down the heating system (
Chapter 9, page 30).
▶ Remove the boiler front panels and front side panels
(
Chapter 11.1, page 31).
▶ Unplug 2 connectors from the fan.
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2
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