Preparation; Checking The Water Quality; Checking The Gas Filter - DeDietrich C 340 Series Installation And User Manual

11 Maintenance
Fig.109

Checking the water quality

148 C 340 / C 640
11.3.1
Carry out the following steps before commencing inspection and
maintenance activities:
1. Set the boiler to full load until the return temperature is around 65°C,
2. Check the water pressure.
3. Check the ionisation current at full load and at low load.
4. Check the condition and tightness of the flue gas outlet and air supply
5. Check the combustion by measuring the O
11.3.2
The requirements for the water quality can be found in our Water quality
instructions.
1. Fill a clean bottle with some water from the boiler using the filling/drain
2. Check the quality of this water sample or have it checked.
1
2
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11.3.3
The gas control valve on the boiler is fitted with a gas filter. Check the gas
filter for dirt. Proceed as follows:
See
The boiler service manual for the specific maintenance work. This
manual can be found on the website.

Preparation

to dry the heat exchanger on the flue gas side.
The minimum water pressure is 0.8 bar. The recommended water
pressure is between 1.5 bar and 2.0 bar.
2.1. If necessary, top up the central heating system.
The value is stable after 1 minute.
3.1. If the value is lower than 3 µA, clean or replace the ionisation
and ignition electrode.
system.
gasses.
Checking the water quality
Caution
Not fulfilling the water quality requirements can damage the boiler
and will void the warranty.
valve.

Checking the gas filter

percentage in the flue
2
7762666 - v.02 - 29092020