Aqua-Hot AHE-100-02S, Руководство по обслуживанию

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— Page 54 —
© 2011 Aqua-Hot
®
AHE-100-02S Hydronic Heating System Service Manual—Rev. B
Flame Sensor:
The flame sensor is a photo resistive device which
supplies the diesel-burner’s controller with a DC
voltage signal when it detects a flame. When the
flame sensor senses the light of the flame, it will
shut the ignition coil off, and send a signal to the
diesel burner controller indicating that everything is
working properly. If the flame sensor does not
sense the flame, it will shut the diesel burner down
in a default after 20 seconds.
Component Test: Ohms
1. In order to perform the following procedures it is
necessary to detach the diesel-burner. Be sure to
review the detaching/attaching instructions in sec-
tion 7.
2. Once the diesel burner has been removed, Locate
and detach the flame sensor’s green and blue wires
from the C-plug harness wires.
3.
Connect the flame sensor’s green and blue wires to
an ohmmeter.
4.
Check resistance by placing a shop rag over the
flame sensor’s glass surface, to simulate a no flame
condition, and then remove the rag and expose to a
light source, to simulate a flame condition.
5.
If the flame sensor is operating properly, the ohm-
meter should register high resistance, over 100K Ω
when the glass surface is covered, and less than 200
Ω when exposed to a light source.
6.
If these resistance numbers cannot be obtained, ver-
ify the flame sensor’s glass surface is clean. If the
flame sensor is clean and the resistance numbers
cannot be obtained, the flame sensor must be re-
placed.
Flame Sensor Maintenance:
1.
For light dirt, dust, and/or carbon deposits, simply
wipe off the flame sensor with a soft cloth.
2.
Should heavy carbon deposits be present, complete-
ly remove the flame sensor from the photo disc and
clean with brake cleaner.
NOTE:
In order to perform the following procedures it is
necessary to detach and reattach the diesel-burner
head. Be sure to review the detaching/attaching
instructions.
NOTE: Be sure to calibrate your ohmmeter prior to check-
ing the flame sensor to proper resistance values.
Flame Sensor
Green Wire
Blue Wire
Figure 40
S
ECTION
8: D
IESEL
-B
URNER
C
OMPONENTS
/T
ROUBLE
S
HOOTING