Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 8: DIESEL-BURNER SERVICE, MAINTENANCE, AND REPAIR INFORMATION
Flame
Sensor,
continued
8.5
Ignition Electrodes
Function:
The Diesel-Burner’s
Ignition Coil
(reference Figure 24) produces a high
voltage ignition spark across the
Ignition Electrodes
, which ignites the incoming air/fuel
mixture.
NOTE:
The functionality of each component can be determined by completing
the manual checks, as listed under the “Component Test” area for each
individual component, or the components can be tested by using a
“Controller Tester.” Reference Section 11 for Special Tools information.
NOTE:
In order to perform the following procedures, it is necessary to detach
and reattach the
Diesel-Burner Head
. Therefore, be sure to review
Section 8.2 for detaching and reattaching instructions.
Component Test:
N/A
Cleaning Tips/Maintenance:
Polish away any carbon deposits, which may have baked
onto the metal tips of the
Ignition Electrodes
with a Scotch Brite pad (or similar);
reference Figure 16. If the Ignition Electrode’s
electrical insulator
(reference Figure 16) is
cracked and/or damaged, the
Ignition Electrode
must be replaced; reference the Ignition
Electrode “Replacement Procedure” in this section. Reference Section 10 for spare parts
information.
NOTE:
The
Electrode Adjustment Gauge
is used to set the gap between the
Ignition Electrodes
. The
Electrode Adjustment Gauge
is located on the
outside surface of the
Diesel-Burner Head
on the left side.
Adjustment Procedure:
An adjustment of the
Ignition Electrodes
can be accomplished
by performing the following procedure:
1.
Slightly loosen the
Retaining Clamp Bolt
; reference Figure 16.
2.
Place the
Electrode Adjustment Gauge
on the
Fuel
Nozzle Manifold Hex
(reference Figure 17) and insert the metal tips of the
Ignition Electrodes
Ignition
Electrodes
Photo
Disc
Flame
Sensor
Green
Wire
Wire
Green Wire
(to Diesel-Burner)
Wire
(to Diesel-Burner)
Figure
15
®
NOTE:
This screw is used to
fasten the
Flame Sensor
to
the
. Remove
when replacing the
Flame
Sensor
.
Photo Disc
Violet
Blue
Page 49
