Check Expansion Tank; Check Boiler Relief Valve; Check Control Settings; Check Burner Flame - Crest Audio FBN0751 Service Manual

2
Maintenance

Check expansion tank

1. Expansion tanks provide space for water to move in
and out as the heating system water expands due to
temperature increase or contracts as the water cools.
Tanks may be open, closed or diaphragm or bladder type.
See Section 5 - Hydronic Piping of the Crest Installation
and Operation Manual for suggested best location of
expansion tanks and air eliminators.

Check boiler relief valve

1. Inspect the relief valve and lift the lever to verify flow.
Before operating any relief valve, ensure that it is piped
with its discharge in a safe area to avoid severe scald
potential. Read Section 5 - Hydronic Piping of the Crest
Installation and Operation Manual before proceeding
further.
Safety relief valves should be re-inspected
WARNING
AT LEAST ONCE EVERY THREE YEARS,
by a licensed plumbing contractor or
authorized inspection agency, to ensure
that the product has not been affected by
corrosive water conditions and to ensure
that the valve and discharge line have not
been altered or tampered with illegally.
Certain naturally occurring conditions may
corrode the valve or its components over
time, rendering the valve inoperative. Such
conditions are not detectable unless the
valve and its components are physically
removed and inspected. This inspection
must only be conducted by a plumbing
contractor or authorized inspection agency
– not by the owner. Failure to re-inspect
the boiler relief valve as directed could
result in unsafe pressure buildup, which
can result in severe personal injury, death,
or substantial property damage.
Following installation, the valve lever must
WARNING
be operated AT LEAST ONCE A YEAR to
ensure that waterways are clear. Certain
naturally occurring mineral deposits may
adhere to the valve, rendering it inoperative.
When manually operating the lever, water
will discharge and precautions must be
taken to avoid contact with hot water and
to avoid water damage. Before operating
lever, check to see that a discharge line is
connected to this valve directing the flow of
hot water from the valve to a proper place
of disposal.
injury may result. If no water flows, valve
is inoperative. Shut down the boiler until a
new relief valve has been installed.
2. After following the above warning directions, if the
relief valve weeps or will not seat properly, replace
the relief valve. Ensure that the reason for relief valve
weeping is the valve and not over-pressurization of
the system due to expansion tank waterlogging or
undersizing.
(continued)
Otherwise severe personal
Inspect ignition and flame 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. 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. Navigate to the Setup Screen and check all settings. See
Section 1 of this manual. Adjust settings if necessary. See
Section 1 of this 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 of the Crest Installation and Operation
Manual.
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.
• Shut down the boiler:
- Follow the "To Turn Off Gas to Appliance"
instructions for the boiler in Section 9 - Startup
of the Crest Installation and Operation Manual.
- Do not drain the boiler unless it will be
exposed to freezing temperatures.
freeze prevention fluid in system, do not drain.
3. Allow time for the boiler to cool to room temperature if it
has been firing.
Service Manual
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