Section: Perform Regular Maintenance
○Natural Draft Applications; typically
○Direct Venting; typically may not require draft adjustment.
○High Efficiency/Positive Pressure Appliances; also vary from traditional appliances (see manufacturer’s recommendations).
3.Follow these four steps to properly adjust the burner:
Step 1: Adjust the air dial until a trace of smoke is achieved.
Step 2: At the trace of smoke level, measure the CO2 (or O2) . This is the vital reference point for further adjustments. Example: 13.5% CO2 (2.6% O2)
Step 3: Increase the air to reduce the CO2 by
1.5to 2 percentage points. (O2 will be increased by approximately 2.0 to 2.7 percentage points.) Example: Reduce CO2 from 13.5% to 11.5% (2.6% to 5.3% O2).
Step 4: Recheck smoke level. It should be Zero.
○This procedure provides a margin of reserve air to accommodate variable conditions.
○If the draft level has changed, recheck the smoke and CO2 levels and readjust the burner if necessary
4.Once combustion is set, tighten all fasteners on air dial, rear access door, and escutcheon plate.
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.
Perform Regular Maintenenance
Annual Professional
Service Required
Tampering with or making incorrect adjustments could lead to equipment malfunction and result in asphyxiation, explosion or fire.
yDO NOT TAMPER WITH THE UNIT OR CONTROLS - CALL YOUR SERVICE PERSONNEL. To ensure continued reliable operation, a qualified service technician must service this burner annually.
yMore frequent service intervals may be required in dusty or adverse environments.
yOperation and adjustment of the burner requires technical training and skillful use of combustion test instruments and other test equipment.
The following guidelines are provided for routine maintenance.
□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
□Remove and clean the pump strainer if applicable.
□Replace the nozzle with an exact replacement as specified by the appliance manufacturer.
□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 cables and connections.
□Clean the cad cell grid surface, if necessary.
□Inspect all gaskets. Replace any that are damaged or would fail to seal adequately.
□Inspect the combustion head and air tube. Remove any carbon or foreign matter. Replace all damaged units with exact parts.
□Clean the blower wheel, air inlet, air guide, burner housing and nozzle line assembly 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.
□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 restriction.
□Clean all flue passages and flue pipe. Replace corroded or damaged pipes.
□Clean the appliance thoroughly according to the manufacturer’s recommendations.
□Check the burner performance. Refer to the section “Set combustion with test instruments”.
□It is good practice to make a record of the service performed and the combustion test results.
AFII Burner Manual
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