Lochinvar Sunc Condensing Boiler 1.3 - Manual (Page 60)

60
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 in the SYNC Service Manual for
other procedures to deal with low flame signal.
Review with owner
1. Review the SYNC User’s Information Manual with the owner.
2. Emphasize the need to perform the maintenance schedule
specified in the SYNC User’s Information Manual (and in this
manual as well).
3. Remind the owner of the need to call a licensed contractor
should the boiler or system exhibit any unusual behavior.
4. Remind the owner to follow the proper shutdown procedure
and to schedule an annual start-up at the beginning of the next
heating season.
Installation & Operation Manual
11
Maintenance
Inspect ignition and flame
sense electrodes
1. Remove the ignition and flame sense electrodes
from the boiler heat exchanger access covers.
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 electrodes, making
sure the gaskets are 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 control module display to Parameter Mode
and check all settings. See Section 1 of the SYNC
Service Manual. Adjust settings if necessary.
See Section 1 of the SYNC 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 9 - 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
burners and clean them thoroughly using a vacuum cleaner or
compressed air. Do not use compressed air to clean burners if
performed inside a building.
3. Remove the burners, reference FIG. 11-2.
4. When replacing the burners, ensure gaskets are in good condition
and positioned correctly (FIG. 11-2).
BURNER
AIR/GAS GASKET
FLAPPER VALVE
BURNER DOOR
BURNER DOOR
HEX NUT (6)
IGNITER
FLAME SENSE
IGNITER GASKET
FLAME SENSE
GASKET
FLAME SENSE
SCREW (2X)
IGNITER SCREW (2X)
DOOR FIBER
FLAPPER VALVE
SCREW (5X)
Figure 11-2 Burner Assembly