Aqua-Hot AHE-100-02S Service Manual Download Page 64

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AHE-100-02S Hydronic Heating System Service Manual—Rev. B

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.

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.

Remove the four blower housing screws that secure

the blower housing to the blower casing. Remove
the blower housing so that the combustion air blow-
er is exposed.

7. Hold side-B of the blower casing and loosen the

retaining nut located in side-A of the blower casing.
Remove the retaining nut, steel drive gear and thick
flat washer from the combustion air blower’s shaft.
Lightly tap the threaded end of the shaft so that the
combustion air blower can be easily removed from
the blower casing.

8. With a pair of snap-ring pliers, remove the snap

rings  from  both  side-A  and  side-B  of  the  blower
casing.  Push all the contents of the bearing kit out
of the blower casing’s bore/bearing cavity.  Discard
the retaining nut, steel drive gear, snap rings, bear-
ings, spacer tube, and washers, as replacements are
provided in the new bearing kit.

Install a new snap ring into side-A of the blower

casing.    Once  the  snap  ring  is  in  place,  insert  the
remaining contents of the new bearing kit into side-
B  of  the  blower  casing,  starting  with  the  wave
washer.    Secure  the  bearing  kit  assembly  in  place
with the remaining snap ring.

10.

Inspect the combustion air blower for warping and/

or damage. If warping or damage is visible, the
combustion air blower must be replaced.

11.

Reference  Figure  49  for  exact  placement  of  the
three washers that slide over the threaded end of the
combustion  air  blower’s  shaft  prior  to  installation.
Failure  to follow the  correct order and direction of
the  dished  surfaces  on  the  washers  will  result  in  a
restricted rotation of the combustion air blower.

12. Slide the combustion air blower’s shaft (with the

three washers) up through the bearing kit assembly

until the threaded portion appears on side-A of the

blower casing. Place the new thick flat washer and

steel drive gear on the threaded end of the combus

tion air blower’s shaft. Thread the new retaining

nut on the combustion air blower’s shaft until it is

finger tight

(DO NOT TIGHTEN.)

NOTE:

Be sure to observe the placement of the three wash-

ers of the bearing kit. To ensure proper tension, the
same order and direction of the dished surfaces of
the washers must be followed when reassembling.

NOTE:

Be sure to inspect the blower casing’s bore/bearing

cavity for signs of damage due to potentially seized
bearings. If damage is present, the blower casing
must be replaced.

NOTE:

It is recommended to mark the internal components

of the diesel burner prior to disassembling of the burner.
Make a mark between the motor flange and the blower hous-
ing, and also between the blower housing and the blower
casing. If the burner is assembled improperly the protection
cap will not go on.

Figure 49

ECTION

8: D

IESEL

-B

URNER

OMPONENTS

ROUBLE

HOOTING