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Instruction Manual – Model AFG Oil Burner
10
To replace blower wheel:
Perform annual maintenanceStartup burner/set combustion
Do not attempt to start the burner when excess fuel or vapor has
accumulated in the appliance. Starting the burner under these conditions could
result in a puffback of hot combustion gases, high smoke levels, or otherwise
hazardous operation.
1. Open the shutoff valves in the oil supply line to the burner.
2. Close air band and partially open air shutter. This is an initial air setting for
the pump venting procedure only. Additional adjustments must be made
with instruments.
3. Set the thermostat substantially above room temperature.
4. Close the line voltage switch to start the burner. If the burner does not start
immediately you may have to reset the safety switch of the burner primary
control.
5. as soon as burner motor starts rotating.
To vent the fuel unit, attach a clear plastic hose over the vent plug. Loosen
the plug and catch the oil in an empty container. Tighten the plug when all
air has been purged from the oil supply system.
• If the burner locks out on safety during venting, reset the safety switch
and complete the venting procedure. Note — Electronic safety switches
can be reset immediately; others may require a three- to five-minute
wait.
• If burner stops after flame is established, additional venting is probably
required. Repeat the venting procedure until the pump is primed and a
flame is established when the vent plug is closed.
• For R7184 primary controls, see
Technician’s Quick Reference Guide
,
Beckett part number 61351, for special pump priming sequence.
• Prepare for combustion tests by drilling a ¼" sampling hole in the flue
pipe between the appliance and the barometric draft regulator.
6. — Using a smoke tester, adjust the air shutter (and air
band, if necessary) to obtain a clean flame. Now the additional combustion
tests with instruments can be made.
This equipment must be serviced only by a qualified service agency.
The appropriate test instruments must be used. Failure to do so could result in
burner or appliance failure, causing potential severe personal injury, death or sub-
stantial property damage.
❏ Replace the oil supply line filter. The line filter cartridge must be replaced to
avoid contamination of the fuel unit and nozzle.
❏ Inspect the oil supply system. All fittings should be leak-tight. The supply
lines should be free of water, sludge and other restrictions.
❏ Remove and clean the pump strainer if applicable.
❏ Replace the nozzle with an equivalent nozzle.
❏ Clean and inspect the electrodes for damage, replacing any that are cracked
or chipped.
❏ Check electrode tip settings. Replace electrodes if tips are rounded.
❏ Inspect the igniter spring contacts.
❏ Clean the cad cell grid surface, if necessary.
❏ Make sure low firing rate baffle is in place if required for the burner applica-
tion. Omitting the baffle can result in unacceptable burner combustion.
❏ Inspect all gaskets. Replace any that are damaged or would fail to seal
adequately.
❏ Clean the blower wheel, air inlet, air guide, retention head and static plate of
any lint or foreign material.
❏ If motor is not permanently lubricated, oil motor with a few drops of SAE 20
nondetergent oil at each oil hole. DO NOT over oil motor. Excessive oiling can
cause motor failure.
❏ Check motor current. The Amp draw should not exceed the nameplate rating
by more than 10%.
❏ Check all wiring for secure connections or insulation breaks.
❏ Check the pump pressure and cutoff function.
❏ Check primary control safety lockout timing.
❏ Check ignition system for proper operation.
❏ Inspect the vent system and chimney for soot accumulation or other restric-
tion.
❏ Clean the appliance thoroughly according to the manufacturer's recommen-
dations.
❏ Check the burner performance. Refer to the section “Set combustion with
instruments.”
It is good practice to make a record of the service performed and the combustion
test results.
1. Turn off all power to the burner before
servicing.
2. Disconnect the wires to the burner mo-
tor.
3. Remove the bolts securing the blower
motor to the housing.
4. Remove the blower motor and wheel.
5. Remove the existing wheel.
6. As shown at right, slide the new blower
wheel onto the shaft.
• Place a .030" (1/32" ± 1/64") feeler
gauge on the motor as shown.
• Slide blower wheel toward motor until
it contacts feeler gauge.
• Rotate the wheel until the set screw
is centered on the flat of the motor
shaft.
• Tighten the set screw to secure the wheel.
7. DO NOT use a motor that has endshield openings outside the blower wheel
circumference represented by the dashed line.
8. Install the motor on the burner housing. Tighten screws. Reconnect motor
wires.
9. Restore power, start the burner and perform combustion tests. Refer to “
Set
combustion with instruments
”
Set combustion with instruments
The combustion must be adjusted using test instruments. Failure
to do so could result in burner or appliance failure, causing potential severe
personal injury, death or substantial property damage.
1. Let burner run for approximately 5 to 10 minutes.
2. Set the over-fire or stack draft to level specified by appliance manufacturer
(usually –0.01 to –0.02 inches w.c. over-fire for natural draft applications).
3. Follow these four steps to properly adjust the burner:
Step 1: Adjust air until a trace smoke level is achieved.
Step 2: At the trace of smoke level, measure the CO
2
(or O
2
). This is the vital
reference point for further adjustments.
• Example: 13.5% CO
2
(2.6% O
2
).
Step 3: Increase the air to reduce CO
2
by 1 to 2 percentage points. (O
2
will be
increased by approximately 1.4 to 2.7 percentage points.)
• Example: Reduce CO
2
from 13.5% to 11.5%. (O
2
— 2.6% to 5.3%.)
Step 4: Recheck smoke level. It should be zero.
• This procedure provides a margin of reserve air to accommodate vari-
able conditions.
• If the draft level has to be changed, recheck the smoke and CO
2
levels. Adjust the burner air if necessary.
4. Once combustion is set, tighten all fasteners on air band, air shutter and
head adjusting plate or escutcheon plate.
5. Burner equipped with cover — Reinstall cover and repeat steps 2 and 4
above. If CO
2
increases (O
2
decreases), remove the cover and adjust the air
setting so the CO
2
(O
2
) with cover on meets the requirements of step 3.
6. Start and stop the burner several times to ensure satisfactory operation. Test
the primary control and all other appliance safety controls to verify that they
function according to the manufacturer’s specifications.
Startup & adjust burner Service & maintain burner