Dunkirk XEB-2 Installation Instructions Manual page 26

BURNERS
A visual check of the pilot and main burner flames
should be made at least once each year, preferably
at the beginning of the heating season. See page
17 and Figures 14, 15 and 16.
RELIEF VALVE
This valve should open automatically if the system
pressure exceeds the pressure rating (usually 30
psi) of the relief valve. Should it ever fail to open
under this condition, shut down your system. Drain
the system until system pressure is reduced below
the relief valve pressure rating. If valve discharge
occurs, or if valve fails to open as described above,
contact an authorized contractor or qualified service
technician to replace the relief valve and inspect the
heating system to determine the cause, as this may
indicate an equipment malfunction.
This valve should be tested every month during
periods of boiler operation, and at the beginning
and end of any extended non-service period. Prior
to testing, make certain discharge pipe is properly
connected to valve outlet and arranged so as to
contain and safely dispose of boiler discharge. Test
at normal system operating pressure. Hold the trip
lever fully open for at least five seconds in order to
flush free any sediment that may lodge on the valve
seat. Then permit the valve to snap shut.
EXPANSION TAN K
As previously noted, this tank may become
waterlogged, or may receive an excess of air.
Frequent automatic opening of the relief valve
indicates water logging. A high boiler temperature
accompanied by unusually low radiation unit
temperature (and "knocking") indicates excess air
in tank.To correct either condition, close the valve
between the boiler and the tank. Drain the tank until
it is empty. Check all the tank plugs and fittings.
Tightenas necessary. Open the valve between the
boiler and tank. Water will rise to the normal height in
the tank if you have an automatic fill valve (otherwise,
manually refill the system).
BOILER FLUE PASSAGES
Under normal operating conditions, with the burners
properly adjusted, it should not be necessary to
clean the boiler flue gas passages. However, to
assure trouble-free operation, we recommend that
you have the flue passages, burner adjustment,
and operation of the controls checked once each
year by a competent Service Technician.
Before the start of each season
(or whenever system has been shut down for some
time) recheck the whole system for leaks.., and
recheck the boiler and vent pipe for leaks. Replace
or patch any boiler seals that are faulty.
VENT PIPE
The venting of this unit is very important and
the piping should be checked at least once a
month. If the vent piping shows any sign of
leaking, replace it immediately.
WATE R SYSTEM
If system is to remain out of service during freez-
ing weather, always drain it completely (water left
in to freeze will crack the pipes and/or boiler).
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