Lochinvar Outdoor Knight Boiler 151-286 - Manual (Page 52)

9
Maintenance
Inspect ignition and flame sense
electrodes
1. Remove the ignition and flame sense electrodes from the
boiler heat exchanger access cover.
2. Remove any deposits accumulated on the ignition/flame
sense electrode using sandpaper. If the electrodes cannot
be cleaned satisfactorily, replace with new ones.
3. Replace ignition/flame 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
Outdoor Knight Boiler Service Manual. Adjust settings
if necessary. See Section 1 of the Outdoor Knight Boiler
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 specified in
Section 7 - Start-up.
2. Verify cold fill pressure is correct and that operating
pressure does not go too high.
Check burner flame
1. Inspect flame through observation window.
2. If the flame is unsatisfactory at either high fire or low fire,
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. 9-2 below.
4. When replacing the burner, ensure gasket is in good
condition and positioned correctly (FIG. 9-2).
IMG00447
AIR / GAS ARM
SCREWS
(QTY. 5)
GASKET
BURNER
HEAT EXCHANGER
ACCESS DOOR
INSULATION
Figure 9-2 Burner Assembly
52
Check flame signal
1. At high fire the flame signal shown on the display should be
at least 10 microamps.
2. A lower flame signal may indicate a fouled or damaged
flame sense electrode. If cleaning the flame sense electrode
does not improve, ground wiring is in good condition, and
ground continuity is satisfactory, replace the flame sense
electrode.
3. See Section 3 - Troubleshooting of the Outdoor Knight
Boiler Service Manual for other procedures to deal with
low flame signal.
Outdoor Knight Boiler Installation & Operation Manual