Table of Contents
Advertisement
11
Maintenance
Inspect
ignition
sense electrodes
1. Remove the ignition and both flame sense electrodes
from the burner plate.
2. Remove any deposits accumulated on the ignition/
flame sense electrodes using sandpaper.
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. Navigate to the Setup Screen and check all settings.
See Section 1 of the Crest Service Manual. Adjust
settings if necessary. See Section 1 of the Crest
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 windows.
2. If the flame is unsatisfactory at either high fire
or low fire, remove and clean the burner. Clean
the burner thoroughly using a vacuum cleaner
or compressed air. Do not use compressed air to
clean the burner if cleaning is performed inside a
building.
56
and
flame
3. Allow time for the boiler to cool to room temperature if it has
If the
4. Remove the top access panel to remove the gas/air manifold
5. Remove the nuts securing the burner to the burner mounting
6. When replacing the burner, ensure gaskets are in good condition
7. When securing the burner, be sure to tighten the nuts, but DO
Figure 11-2 Burner Assembly
Check flame signal
1. At high fire of each combustion system, the flame signal shown
2. A lower flame signal may indicate a fouled or damaged flame
3. See Section 3 - Troubleshooting in the Crest Service Manual for
Installation & Operation Manual
• Shut down the boiler:
- Follow the "To Turn Off Gas to Appliance" instructions
for the boiler in Section 9 - Startup.
- Do not drain the boiler unless it will be exposed to
freezing temperatures. If using freeze prevention fluid
in system, do not drain.
been firing.
assembly.
plate. Remove the burner (FIG. 11-2).
and positioned correctly (FIG. 11-2).
NOT over-tighten. Tighten the nuts to a torque setting of no
more than 6.2 ft.-lbs. When securing the burner mounting plate
be sure to tighten the nuts, but DO NOT over-tighten. Tighten
the nuts to a torque setting of no more than 15.5 ft.-lbs.
on the display should be at least 10 microamps.
sense electrode. If cleaning the flame sense electrodes does
not improve, ground wiring is in good condition, and ground
continuity is satisfactory, replace the flame sense electrode.
other procedures to deal with low flame signal.
INSULATION
AIR/GAS
MANIFOLD
MANIFOLD
GASKET
BURNER
ASSEMBLY
BURNER
GASKET
BURNER PLATE
FIBERBOARD
Advertisement
Table of Contents
