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Beckett
Instruction Manual – Model AF Oil Burne
r
Startup & adjust burner Service & maintain burner
Perform regular maintenance Startup 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.
WARNING
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 substantial property damage.
WARNING
1. Open the shutoff valves in the oil supply line to the burner.
Replace the oil supply line filter. The line filter cartridge must be replaced
to avoid contamination of the fuel unit and nozzle.
2. Close air band and partially open air shutter. This is an initial air setting
for the pump bleeding procedure only. Additional adjustments must be
made with instruments.
Inspect the oil supply system. All fittings should be leak-tight. The supply
lines should be free of water, sludge and other restrictions.
3. Set the thermostat substantially above room temperature.
Remove and clean the pump strainer if applicable.
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.
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.
5.
Bleed air from the fuel unit
as soon as burner motor starts rotating.
Inspect the igniter spring contacts.
To bleed the fuel unit, attach a clear plastic hose over the vent fitting.
Loosen the fitting and catch the oil in an empty container. Tighten the
fitting when all air has been purged from the oil supply system.
Clean the cad cell grid surface, if necessary.
Inspect all gaskets. Replace any that are damaged or would fail to seal
adequately.
•
If the burner locks out on safety during bleeding, reset the safety
switch and complete the bleeding procedure. Note — Electronic
safety switches can be reset immediately; others may require a three-
to five-minute wait.
Clean the blower wheel, air inlet, 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.
• If burner stops after flame is established, additional bleeding is
probably required. Repeat the bleeding procedure until the pump is
primed and a flame is established when the vent fitting is closed.
Check motor current. The Amp draw should not exceed the nameplate
rating by more than 10%.
• For R7184 primary controls, see Technician’s Quick Reference Guide,
Beckett part number 61351, for special pump priming sequence.
Check all wiring for secure connections or insulation breaks.
Check the pump pressure and cutoff function.
• Prepare for combustion tests by drilling a ¼" sampling hole in the flue
pipe between the appliance and the barometric draft regulator.
Check primary control safety lockout timing.
Check ignition system for proper operation.
6.
Initial air adjustment
— 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
Inspect the vent system and chimney for soot accumulation or other
restriction.
Clean the appliance thoroughly according to the manufacturer's
recommendations.
Set combustion with instruments
Check the burner performance. Refer to the section “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.
WARNING
It is good practice to make a record of the service performed and the
combustion test results.
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).
To replace the blower wheel:
1. Turn off all power to the burner before servicing.
3. Follow these four steps to properly adjust the burner:
2. Disconnect the burner motor wires.
Step 1:
Adjust air until a trace smoke level is achieved.
3. Remove the bolts securing the blower motor to
the housing.
Step 2:
At the trace of smoke level, measure the CO
2
(or O
2
). This is
the vital reference point for further adjustments.
4. Remove the blower motor and wheel.
•
Example: 13.5% CO
2
(2.6% O
2
)
5. Remove the existing wheel.
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.)
6. As shown at right, slide the new blower wheel
onto the shaft.
• Place a .125" (1/8" ± 1/32") feeler gauge on
the motor as shown.
•
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.
• Slide blower wheel toward motor until it
contacts feeler gauge.
•
This procedure provides a margin of reserve air to accommodate
variable conditions.
• Rotate the wheel until the setscrew is
centered on the flat of the motor shaft.
Tighten the setscrew to secure the wheel.
• If the draft level has to be changed, recheck the smoke and CO
2
levels. Adjust the burner air if necessary.
SK9190A
4. Once combustion is set, tighten all fasteners on air band and air shutter.
7. Install the motor on the burner housing. Tighten screws. Reconnect wires.
5. 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.
8. Restore power, start the burner and perform combustion tests. Refer to
the section
“
Set combustion with instruments
”.
9