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75
AIR ARM
SCREWS
(QTY. 5)
GASKET
BURNER
Figure 12-4 Burner Assembly - Models 601 - 801
12 Maintenance (continued)
Inspect ignition and fl ame sense
electrodes
1. Remove the ignition and fl ame sense electrodes from the
boiler heat exchanger access cover.
2. Remove any deposits accumulated on the ignition/fl ame
sense electrode using sandpaper. If the electrodes cannot
be cleaned satisfactorily, replace with new ones.
3. Replace ignition/fl ame sense electrode, making sure
gasket is in good condition and correctly positioned.
Check ignition ground wiring
1. Inspect boiler ground wire from the heat exchanger
access cover to ground terminal strip.
2. Verify all wiring is in good condition and securely
attached.
3. Check ground continuity of wiring using continuity
meter.
4. Replace ground wires if ground continuity is not
satisfactory.
Check all boiler wiring
1. Inspect all boiler wiring, making sure wires are in good
condition and securely attached.
Check control settings
1. Set the SMART SYSTEM control module display to
Parameter Mode and check all settings. See Section
1 of the Knight XL Service Manual. Adjust settings if
necessary. See Section 1 of the Knight XL Service Manual
for adjustment procedures.
2. Check settings of external limit controls (if any) and
adjust if necessary.
Perform start-up and checks
1. Start boiler and perform checks and tests specifi ed in
Section 10 - Start-up.
2. Verify cold fi ll pressure is correct and that operating
pressure does not go too high.
Check burner fl ame
1. Inspect fl ame through observation window.
2. If the fl ame is unsatisfactory at either high fi re or low fi re,
turn off boiler and allow boiler to cool down. Remove
the burner and clean it thoroughly using a vacuum
cleaner or compressed air. Do not use compressed air to
clean burner if performed inside a building.
3. Remove the burner, reference FIG.’s 12-2 thru 12-4.
4. When replacing the burner, ensure gasket is in good
condition and positioned correctly (FIG.’s 12-2 thru
12-4).
AIR / GAS ARM
SCREWS
(QTY. 5)
GASKET
BURNER
Figure 12-2 Burner Assembly - Model 400
BURNER
GASKET
SCREWS
(QTY. 5)
AIR / GAS ARM
Figure 12-3 Burner Assembly - Model 501
Installation & Operation Manual