7 Cleaning and servicing the heating system – Requirements
93
✎
See the “HDG Control” operating manual, chapter “5 Using the
control unit”, section “5.2 Switching on the heating system”.
✓
The cleaning shaft and the turbulators have now been cleaned.
C
HECKING
AND
CLEANING
THE
LAMBDA
SENSOR
1.
Switch the heating system off.
✎
See the “HDG Control” operating manual, chapter “5 Using the
control unit”, section “5.3 Switching off the heating system”.
2.
Allow the fire to burn out and cool down.
3.
Turn the main switch off.
6.
Clean the lambda sensor (2) with a vacuum cleaner.
7.
Clean out any deposits inside the connection nozzle (3).
8.
Reinstall the lambda sensor (2) in the reverse sequence.
9.
Check the lambda sensor (2) for a secure fit.
10.
Carefully tighten the lambda sensor (2) in the ceramic seal with a
22 mm spanner.
11.
Re-starting the heating system.
✎
See the “HDG Control” operating manual, chapter “5 Using the
control unit”, section “5.2 Switching on the heating system”.
✓
The lambda sensor has been checked and cleaned.
Important!
✎
Observe the “Generally applicable safety instructions” in this sec-
tion.
4.
Using a pipe wrench, unscrew
the DN 40 union nut (1).
5.
Remove the lambda sensor
(2) and the ceramic washer
under it from the connection
nipple (3) of the flue gas pipe.
Figure 7/14 - Cleaning the lambda sensor
1
2
3
Important!
Steel bristles will damage the lambda sensor.
Important!
When reinstalling the lambda sensor, make sure its seal is intact.
Use a pipe wrench to tighten the union nut. Do not tighten the
lambda sensor excessively. Never tighten the lambda sensor by the
body of the sensor.