Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 8: DIESEL-BURNER SERVICE, MAINTENANCE, AND REPAIR INFORMATION
Bearings
8.9
Bearings
Function:
The
Bearings
support the Combustion Air Blower’s shaft and allows the
blower to turn smoothly.
NOTE:
The functionality of each component can be determined by completing
the manual checks, as listed under the “Component Test” area for each
individual component, or the components can be tested by using a
“Controller Tester.” Reference Section 11 for Special Tools information.
NOTE:
In order to perform some of the following procedures, it is necessary to
detach and reattach the
Diesel-Burner Head
. Therefore, be sure to
review Section 8.2 for detaching and reattaching instructions.
Function Test:
Remove the
Motor
(reference Section 8.3 for the Motor’s “Replacement
Procedure”) and spin the
Combustion Air Blower
by hand (place one of the
Clutch Halves
to the end of the shaft to assist with this spinning exercise). If the
Combustion Air Blower
rotates smoothly without any friction or noise, the
Bearings
are in proper working condi-
tion. However, if the
Combustion Air Blower
does not rotate smoothly and/or produces
noise, the
Bearings
are worn and must be replaced; reference the Bearings “Replace-
ment Procedure” in this section.
Component Test:
N/A
Cleaning Tips/Maintenance:
N/A
Adjustment Procedure:
N/A
Replacement Procedure:
1.
Clamp off and remove the
Fuel Supply Line
and
Fuel Return Line
from
the
Diesel-Burner Head
; reference Figures 19 and 22.
2.
Locate and disconnect the
C-Plug
Harness
wires
, which connect to the
Flame Sensor
and
Fuel Solenoid
; reference Figures 3, 15, and 18.
Also, disconnect the
Ignition Cables
from the
Ignition Electrodes
; refer-
ence Figures 16 and 19.
3.
Remove the four
Fuel
Nozzle Manifold Plate Screws
, which secure the
Fuel Nozzle Manifold Plate
in place; reference Figure 19. Remove the
Fuel
Nozzle Manifold Plate
by pulling on the
Fuel
Nozzle Manifold
until
the plate releases from the cast-aluminum
Blower Casting
; reference
Figures 13, 16, and 19.
4.
Remove the four
Ignition Coil Mounting Screws
, which secure the
Ignition Coil
to the
Protection Housing
; reference Figure 13. Lift the
Ignition Coil
and disconnect its
Black (+)
and
Brown (-)
wires
from the
C-Plug
Harness
wires
, prior to removing; reference Figures 3 and 24.
Remove the
Protection Housing
from the
Diesel-Burner
to expose the
Motor
and
Clutch Halves
; reference Figures 12, 13 and 14.
5.
Remove the three
Hex Head Screws
, which secure the
Motor
and
Motor
Flange
to the
Blower Housing
; reference Figure 13. Remove the
Motor
and flange assembly along with the
Clutch Halves
; reference Figures 13
and 14. Disconnect the Motor’s
Black (+)
and
Brown (-) wires
from the
C-Plug
Harness’
wires
; reference Figure 13.
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