Service manual

— Page 75 —
© January 2013 Aqua-Hot
®
600-D01 Series Hydronic Heating System Service Manual - Rev. A
SECTION 9: DIESEL-BURNER COMPONENTS
Ignition Electrodes
The diesel-burner’s ignition coil produces a high
voltage ignition spark across the ignition electrodes,
which ignites the incoming air/fuel mixture.
Cleaning and Maintenance:
1.
Polish away any carbon deposits that may have
baked onto the metal tips of the ignition electrodes
with a course sponge.
2.
If the ignition electrode’s electrical insulator is
cracked or damaged, the ignition electrode must be
replaced.
Ignition Electrode Adjustment Procedure:
1.
Follow the directions for detaching/reattaching the
diesel burner in section 8 of this manual.
2.
Using a 10mm socket, slightly loosen the retaining
clamp bolt.
3.
Place the electrode adjustment gauge on the nozzle
manifold hex and insert the metal tips of the ignition
electrodes into the appropriate notches of the elec-
trode adjustment gauge.
4.
Using a 10 mm socket, tighten the retaining clamp
bolt.
5.
Remove the electrode adjustment gauge and reat-
tach to the diesel-burner head.
Replacement Procedure:
1.
Using a 10mm socket, loosen and remove the re-
taining clamp bolt, and the retaining clamp.
2.
Slide the electrode out of the photo disc.
3.
To remove the electrode, hold onto the orange
electrode boot, and pull firmly on the electrode.
4.
Once the electrode has been removed Inspect inside
the orange electrode boot for the retaining clip,
which holds the electrode in place. If it is missing,
replace the electrode boot.
NOTE:
The electrode adjustment gauge is used to set the
gap between the ignition electrodes. The electrode adjust-
ment gauge is located on the outside surface of the diesel-
burner head on the left hand side.
NOTE:
Be sure not to over-tighten the retaining clamp
bolt when readjusting the ignition electrodes. Over-
tightening the retaining clamp bolt will bend the retaining
clamp and prevent the photo disc from floating freely. Not
allowing the photo disc to float freely will cause poor com-
bustion and result in a smoky exhaust. A bent retaining
clamp can be re-straightened with a punch and hammer.
Lay the clamp’s beveled side down on a solid flat surface
and align the thick end of the punch at dead center. Tap the
punch lightly until the retaining clamp returns to proper
form.
Figure 51