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S
ECTION
NOTE: If the Blower Motor's yellow/orange signal wire does
not reflect current when the Aqua-Hot's Control Ther-
mostat is calling for heat, the Diesel-Burner Controller
may need to be replaced.
Replacement Procedure:
Be sure to clamp off the Fuel Supply and Return lines prior to
beginning this replacement procedure.
1. Following the procedure for "Detaching and Reattaching
the Diesel-Burner," located in Section 7 of this manual,
detach the Diesel-Burner from the Aqua-Hot.
2. Using a Molex Pin Extractor tool, remove the Blower Mo-
tor's three wires from the #3, #4, and #9 terminals on the
Diesel-Burner's white, electrical plug. Reference Figure
34.
3. Pull the Blower Motor's three wires back through the
Blower Housing until the Blower Motor's wires are free
from the Diesel-Burner.
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 Blower Motor's wires for
removal.
4. Using a 3/8 inch socket wrench, loosen and remove the
two bolts securing the Blower Motor to the Blower Hous-
ing.
5. Remove the defective Blower Motor and attached Blower
Wheel from the Blower Housing.
6. Remove the Blower Wheel from the defective Blower Mo-
tor.
A. Loosen the set screw on the Blower Wheel with a hex-
agonal wrench, then slide the Blower Wheel off of the
defective Blower Motor's shaft.
7. Install the existing Blower Wheel onto the replacement
Blower Motor.
A. Place a 0.030 (1/32 ± 1/64) inch Feeler Gauge on top
of the replacement Blower Motor, then slide the
Blower Wheel onto the Blower Motor's shaft until it
contacts the Feeler Gauge.
8: D
B
IESEL
URNER
®
© 2009 Aqua-Hot
375D Hydronic Heating System Service Manual—Rev. A
C
OMPONENTS AND
B. Rotate the Blower Wheel until the set screw is cen-
tered on the flat of the Blower Motor's shaft.
C. Using a hexagonal wrench, tighten the set screw to
secure the Blower Wheel in place.
8. Insert the Blower Motor and Blower Wheel Assembly into
the Blower Housing and secure it with the two bolts previ-
ously removed.
NOTE: The Blower Motor and Blower Wheel Assembly con-
nects with the Coupling, which connects to the Fuel
Pump Assembly within the Blower Housing; there-
fore, it may be necessary to pull the Ignition Module
Assembly back on its hinge and rotate the Blower
Wheel slowly until the Blower Motor is seated cor-
rectly on the Coupling and moves into place.
9. Thread the Blower Motor's wires into the Blower Housing
through the small hole in the Blower Housing, then back
out through the Diesel-Burner's Wiring Access Hole.
10. Connect the Blower Motor's Pink (positive) wire to the #9
terminal, yellow/orange (signal) wire to the #3 terminal,
and the black (ground) wire to the #4 terminal on the Die-
sel-Burner's white, electrical plug; reference Appendix A.
11. Following the procedure for "Detaching and Reattaching
the Diesel-Burner," located in Section 4 of this manual,
reattach the Diesel-Burner to the Aqua-Hot.
NOTE: The Mounting Gasket must be replaced each time the
Diesel-Burner is detached from the Aqua-Hot; refer-
ence the procedure for "Detaching and Reattaching
the Diesel-Burner," located in Section 7 of this manu-
al for instructions.
12. Connect the Diesel-Burner and Diesel-Burner Controller's
white, electrical connections together and press down on
the tabs to secure them together.
Be sure to remove the clamps from the Fuel Supply and Fuel
Return lines prior to starting the Diesel-Burner.
R
I
EPAIR
NFORMATION
— Page 90 —
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