©
HDG Bavaria GmbH 07/2008
HDG M299/300/350/400 - Version 1 - en
7 Cleaning and servicing the heating system – Procedure
151
3.
Remove the upper cladding (1) by lifting it upward.
4.
Unscrew the union nut (2) with a pipe wrench.
5.
Pull the lambda sensor (3) with insulating washer out of the con-
nection nozzle (4) of the flue pipe.
6.
Brush off the lambda sensor (3) with a brass brush.
7.
Clean out any deposits inside the connection nozzle (4).
8.
Reinstall the lambda sensor (3) in the reverse sequence.
9.
Check the lambda sensor (3) for a secure fit.
10.
Carefully tighten the lambda sensor (3) with a 22 mm spanner.
11.
Mount the upper cladding (1).
12.
Deactivate the maintenance function.
✎
See section “Maintenance function” in this chapter.
13.
Calibrate the lambda sensor.
✎
See chapter “6.10 SERVICE menu”, section “Flue gas temperature”.
✓
The lambda sensor is cleaned and calibrated.
C
LEANING
THE
FLUE
GAS
TEMPERATURE
SENSOR
1.
Activate the maintenance function.
✎
See section “Maintenance function” in this chapter.
Important!
Steel bristles will damage the lambda sensor.
To clean the lambda sensor, use a fine brass brush instead of a steel
brush.
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
shaft body.
Important!
✎
Observe the “Generally applicable safety instructions” in this
section.
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