Igniter Assembly - Aqua-Hot 375-d Service Manual

S
ECTION

Igniter Assembly:

The Aqua-Hot operates on both AC and DC power. Be
sure to disconnect the 120 Volt-AC power supply prior to
servicing. Failure to do so could result in serious personal
injury, electrical shock, or even death!
Function:
The Igniter Assembly contains the Ignition Electrodes, Fuel
Nozzle, Static Plate, and Fuel-Supply Tube which together
ignite the incoming fuel in order to create the Diesel-Burner's
flame.
Replacement Indicator:
Replace the Igniter Assembly if the Nozzle Holder is damaged
or fuel pipe connection is damaged.
Replacement Procedure:
NOTE: The Diesel-Burner does not need to be detached from
the Aqua-Hot for this replacement procedure.
1. Loosen the hexagonal locknut securing the Fuel-Supply
Tube to the Diesel-Burner. Reference Fig. 61.
2. Loosen the two screws securing the Ignition Module Re-
taining Clips and rotate both clips to release the Ignition
Module. Then tilt the Ignition Module back on its hinge.
8: D B
IESEL URNER
®
© 2009 Aqua-Hot 375D Hydronic Heating System Service Manual—Rev. A
C
OMPONENTS AND
Figure 60
3. Loosen and remove the Escutcheon Plate Spline Nut from
the Escutcheon Plate.
4. Reach into the Blower Housing and pull the Igniter As-
sembly out of the Diesel-Burner.
NOTE: To ease the removal of the Igniter Assembly, rotate
the Igniter Assembly 180° from the installed position
while removing the Igniter Assembly from the Air-
Tube Assembly. If it continues to be difficult to re-
move the Igniter Assembly, the Escutcheon Plate
screw securing the Escutcheon Plate to the Blower
Housing can be removed; however, be sure to align
the edge of the Escutcheon Plate back to the edge of
the label and secure with the Escutcheon Plate screw.
5. Insert the replacement Igniter Assembly into the Air-Tube
Assembly and align the Fuel-Supply Tube back with the
Escutcheon Plate.
6. Tighten the Escutcheon Plate Spline Nut onto the Fuel-
Supply Tube to secure it into place.
7. Close the Ignition Module and secure with the Ignition
Module Retaining Clips.
8. Secure the Fuel-Supply Tube to the Diesel-Burner and
tighten both hexagonal locknuts completely.
NOTE: Ensure that the Escutcheon Plate is set to the edge of
the indicator label on the Blower Housing.
R I
EPAIR NFORMATION
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