Additional service tests
8
Buderus Blue Flame Burner BE 1.3 - 2.3 - Specifications subject to change without notice.
34
8
Additional service tests
This chapter describes how to measure the flame sen-
sor current and how to perform the flue side air tightness
test.
8.1
Measurement of the flame sensor
current
The sensor current can be verified with a multi-meter
(Fig. 34,
Item 1
) with MicroAmp measuring capability.
An unstable flame signal (sensor current < 45 micro-
Amp) is also shown on the LED of the LMO (blinking
green light) (see Table 7, page 13). The sensor current
during operation must be at least 80 microAmp (no
flame < 5 microAmp).
When the sensor current is less than 80 microAmp, the
flame sensor must be cleaned and the opening to the
combustion chamber must be checked for contamina-
tion.
z
Remove flame sensor during burner operation from
its position by pulling on the handle.
z
Clean flame sensor with a soft cloth.
z
Re-install flame sensor.
Fig. 34
Schaltbild und Fühlerstrommessung durchführen
1
2
Burner
Controller LMO
bla
c
k
bl
ue
brown
