Service manual

— Page 82 —
© January 2013 Aqua-Hot
®
600-D01 Series Hydronic Heating System Service Manual - Rev. A
SECTION 9: DIESEL-BURNER COMPONENTS
Bearings:
The bearings support the combustion air blower’s
shaft and allows the blower to turn smoothly.
Bearing Test:
1.
In order to perform the following procedure it is
necessary to detach and reattach the diesel-burner
head. Be sure to review the detaching and reattach-
ing section for detaching and reattaching instruc-
tions.
2.
Locate and disconnect the C-plug harness wires that
connect to the flame sensor and fuel solenoid. Also,
disconnect the ignition cables from the ignition
electrodes.
3.
Remove the four nozzle stand plate screws that se-
cure the nozzle stand plate in place. Remove the
nozzle stand plate by pulling on the nozzle stand
until the plate releases from the cast-aluminum
blower casing.
4.
Remove the four ignition coil screws that secure the
ignition coil to the protection cap. Lift the ignition
coil and disconnect its black (+) and brown (-) wires
from the C-plug harness wires, prior to removing.
Remove the protection cap from the diesel-burner
so that the motor and clutch halves are exposed.
5.
Remove the three hex head screws that secure the
motor and motor flange to the blower housing. Re
move the motor and flange assembly along with the
clutch halves. Disconnect the motor’s black (+) and
brown (-) wires from the C-plug harness’ wires.
6.
Remove the four blower housing screws that secure
the blower housing to the blower casing. Remove
the blower housing so that the combustion air
blower is exposed.
7.
Spin the combustion air blower by hand. Placing
one of the clutch halves to the end of the shaft,
assists with the spinning of the bearings.
8.
If the combustion air blower rotates smoothly with-
out any friction or noise, the bearings are in proper
working condition. If the combustion air blower
does not rotate smoothly and/or produces noise, the
bearings are worn and must be replaced.
Replacement:
1.
In order to perform the following procedure it is
necessary to detach and reattach the diesel-burner
head. Be sure to review the detaching and reattach-
ing section for detaching and reattaching instruc-
tions.
2.
Locate and disconnect the C-plug harness wires that
connect to the flame sensor and fuel solenoid. Also,
disconnect the ignition cables from the ignition
electrodes.
NOTE:
In order to perform the following procedures it is
necessary to detach and reattach the diesel-burner head. Be
sure to review section 9 for detaching and reattaching the
diesel burner instructions
Figure 57