Ignition Module Assembly - Aqua-Hot 375-d Service Manual

S
ECTION

Ignition Module Assembly:

The Aqua-Hot operates on both AC and DC power. Be sure
to disconnect the 120 Volt-AC power supply prior to servic-
ing. Failure to do so could result in serious personal injury,
electrical shock, or even death!
Function:
The Ignition Module's Igniter produces a high-voltage ignition
spark (approximately 20,000 volts), which is released across the
metal tips of the Igniter Assembly's Electrodes during the Diesel-
Burner's initial start-up. This spark ignites the incoming fuel-air
mixture, which produces a flame to heat the Aqua-Hot's Boiler
Tank.
Replacement Indicator:
Replace the Ignition Module Assembly if it becomes cracked or
damaged or if the Igniter is unable to produce a spark across the
Igniter Assembly's Electrodes.
Replacement Procedure:
NOTE: The Diesel-Burner does not need to be detached from
the Aqua-Hot for this replacement procedure.
1. Loosen the two screws securing the Ignition Module Retain-
ing Clips and rotate both clips to release the Ignition Module
Assembly, then tilt the Ignition Module Assembly back on
its hinge.
8: D B
IESEL URNER
Retaining
Clips
®
© 2009 Aqua-Hot 375D Hydronic Heating System Service Manual—Rev. A
C
OMPONENTS AND
2. Using a Molex Pin Extractor tool, remove the Igniter As-
sembly's two wires from the #5 and the #6 Terminals on
the Diesel Burner's white, electrical plug; reference figure
34.
3. Work the wires out and away from the Diesel-Burner; ref-
erence Figure ?.
4. Remove the Ignition Module Assembly by loosening the
two screws securing it to the Diesel Burner Blower Hous-
ing.
4. Secure the replacement Ignition Module Assembly to the
Blower housing, using the two screws previously removed.
NOTE: It may be necessary to clip off and remove the wire
ties bundling the Diesel-Burner components' wires
together in order to free the Cord-Set for removal.
5. Insert the replacement wires thru the Blower Housing and
insert the wires into the Diesel-Burner's white, electrical
plug. The red wire should be inserted into the #5 terminal
and the black wire should be inserted into the #6 terminal
on the Diesel-Burner's white, electrical plug; reference
Figure 34 and Appendix A.
6. Close the Ignition Module Assembly, and secure with re-
taining clips, previously released. Tighten screws.
7. Test for proper operation.
R I
EPAIR NFORMATION
Figure 65
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