Air Band - Aqua-Hot 375-d Service Manual

S
ECTION

Air Band:

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 Air Band, in conjunction with the Air Shutter, helps con-
trol the Diesel-Burner's Combustion-Air level, which mixes
with the diesel fuel spray and is ignited in order to establish a
flame to heat the Aqua-Hot's Boiler Tank.
Replacement Indicator:
Replace the Air Band if it becomes bent or damaged.
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. Unplug the Cord-Set from the Fuel Pump Assembly's Fuel
Solenoid Valve.
3. Remove the Fuel-Supply Tube Assembly:
A. Loosen both hexagonal locknuts on either end of the
Fuel-Supply Tube Assembly with a 7/16 inch open-
end wrench.
B. Pull the Fuel-Supply Tube Assembly away from the
Blower Housing.
4. Using a 3/8 inch socket wrench, remove the two bolts se-
curing the Fuel Pump Assembly to the Blower Housing.
5. Pull the Fuel Pump Assembly straight out from the Diesel-
Burner's Blower Housing.
8: D B
IESEL URNER
®
© 2009 Aqua-Hot 375D Hydronic Heating System Service Manual—Rev. A
C
OMPONENTS AND
NOTE: The Coupling may remain attached to the Fuel Pump
Assembly upon removal from the Diesel-Burner.
6. Using a 5/16 inch socket wrench, loosen and remove the
bolt securing the Air Shutter to the Blower Housing.
7. Remove the Air Shutter from the Diesel-Burner.
8. Using a 5/16 socket wrench, loosen and remove the bolt
on the Air Band.
9. Remove the defective Air Band from the Diesel-Burner by
sliding it off the Blower Housing.
10. Install the replacement Air Band by sliding it onto the
Blower Housing and inserting the bolt previously removed
onto the Air Band and tightening the bolt.
11. Install the Air Shutter back onto the Blower Housing and
secure in place with the bolt previously removed.
NOTE: Be sure the Combustion-Air Indicator on the Air Shut-
ter falls correctly on the Blower Housing's Combus-
tion-Air Adjustment Scale once installed.
9. Insert the Fuel Pump Assembly and attached Coupling, if
applicable, into the Blower Housing.
NOTE: In order to connect the Fuel Pump Assembly to the
Blower Motor with the Coupling, it may be necessary
to pull the Ignition Module back on its hinge and ro-
tate the Blower Wheel slowly until both the Blower
Motor and the Fuel Pump Assembly are seated cor-
rectly on the Coupling.
10. Secure the Fuel Pump Assembly to the Blower Housing
with the two bolts previously removed.
11. Reattach the Fuel-Supply Tube Assembly to the Diesel-
Burner and Fuel Pump Assembly and tighten both hexago-
nal locknuts with a 7/16 inch open-end wrench.
12. Plug the Cord-Set back into the Fuel Pump Assembly's
Fuel Solenoid Valve.
13. Following the procedure for "Detaching and Reattaching
the Diesel-Burner," located in Section 7 of this manual,
reattach the Diesel-Burner to the Aqua-Hot.
R I
EPAIR NFORMATION
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