Fuel Nozzle - Aqua-Hot 375-d Service Manual

S
ECTION
5. Remove the Air-Tube Assembly from the Diesel-Burner.
6. Attach the replacement Air-Tube Assembly to the Diesel-
Burner's Blower Housing and secure all screws and bolts
previously removed.
7. Following the "Igniter Assembly Replacement" procedure,
reinstall the Igniter Assembly.
Figure 58

Fuel Nozzle:

The Aqua-Hot operates on both AC and DC power. Be sure to
disconnect the 120 Volt-AC power supply from the Aqua-Hot
prior to servicing. Failure to do so could result in serious per-
sonal injury, electrical shock, or even death!
Function:
The Fuel Nozzle atomizes the incoming diesel fuel from the Fuel
Pump Assembly in order to reduce the fuel into a fine spray,
which is mixed with incoming combustion air, and then ignited
within the Combustion Chamber to heat the Aqua-Hot's Boiler
Tank.
Replacement Indicator:
Replace the Fuel Nozzle if it does not properly spray the diesel
fuel in a cone-shaped pattern, is damaged or clogged, or as a part
of annual maintenance. Reference the Aqua-Hot's I.D
8: D B
IESEL URNER
®
© 2009 Aqua-Hot 375D Hydronic Heating System Service Manual—Rev. A
C
OMPONENTS AND
8. Install a new Mounting Gasket; reference the "Mounting
Gasket Replacement" procedure in this section.
9. Following the procedure for "Detaching and Reattaching
the Diesel-Burner," reattach the Diesel-Burner to the Aqua
-Hot.
Be sure to remove the clamps from the Fuel Supply and Fuel
Return lines prior to starting the Diesel-Burner.
Label for nozzle information, as well as the Parts Manual in
order to ensure that the proper fuel nozzle is used.
Replacement Procedure:
NOTE: The Diesel-Burner does not need to be detached
from the Aqua-Hot for this replacement procedure.
NOTE: Be sure to use care when handling the replacement
Fuel Nozzle as oils and/or small dust particles from
the hands may plug the Fuel Nozzle's small orifice.
A partially plugged orifice will restrict fuel flow,
which will affect the combustion process of the Die-
sel-Burner (i.e., excessive smoking).
1. Loosen the Fuel-Supply Tube Assembly's hexagonal
locknut on the Fuel Pump Assembly with a 7/16 inch
open-end wrench.
NOTE: The Fuel-Supply Tube Assembly does not need to
be completely removed from the Fuel Pump Assem-
bly, but must be loosened to rotate out of the way.
R I
EPAIR NFORMATION
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