Expansion Tank - ECR Dunkirk PWB Series Manual

BURNERS
A visual check of the pilot end main burner fl ames
should be made at least once each year, preferably at
the beginning of the heating season. See page 17
SAFETY RELIEF VALVE
This valve should open automatically if the system
pressure exceeds the pressure rating (usually 30
psi) of the safety 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 safety relief valve pressure rating. If valve
discharge occurs, or if valve fails to open as described
above, contact an authorized contractor or qualifi ed
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 fi ve seconds in order to fl ush
free any sediment that may lodge on the valve seat.
Then permit the valve to snap shut.

EXPANSION TANK

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 fi ttings. Tighten
as necessary. Open the valve between the boiler
and tank. Water will rise to the normal height in the
tank if you have an automatic fi ll valve (otherwise,
manually refi ll the system).
BOILER FLUE PASSAGES
Under normal operating conditions, with the burners
properly adjusted, it should not be necessary to
clean the boiler fl ue gas passages. However, to
assure trouble-free operation, we recommend that
you have the fl ue 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.
MAINTAINING YOUR BOILER
VENT PIPE
The venting of this unit is very important and the
piping should be checked at least once a season. If
the vent piping shows any sign of leaking, replace it
immediately.
WATER SYSTEM
If system is to remain out of service during freezing
weather, always drain it completely (water left in to
freeze will crack the pipes and/or boiler).
CLEANING YOUR BOILER AND BURNERS
Flue passages between sections should be examined
yearly and cleaned if necessary. To clean, remove
burners, pilot, and vent pipe, Remove top and front
jacket panels. Remove the two screws attaching
the intermediate front panel to the left and right
side jacket panels. Remove the draft diverter and
intermediate front panel as a unit. Carefully remove
the cerafelt gasket strips. Clean passageways
between sections with a fl exible handle wire brush.
Remove dirt from bottom of boiler and from between
sections by vacuuming. Make sure all fl ame ports in
burners are open and clear. Shake out or blow out all
loose dirt in burners. Reseal seams between adjacent
sections as necessary with 400
sealant. Reassemble all parts. Be sure to check
tightness of pilot connections and condition of burner
fl ames after reassembly (see Figures 17 and 18). Be
sure vent pipe connections to chimney are secure and
no obstructions are present.
CIRCULATOR PUMP ISOLATION VALVES
The isolation valves in the circulator pump fl anges
should be operated manually once or twice per year
to prevent the valves from becoming stuck in the
open position Rotate the valves from the open posi-
tion to the closed position and back to the open posi-
tion.
HOUSEKEEPING
• Keep boiler area clear and free from combustible
materials, gasoline and other fl ammable vapors
and liquids.
• Keep boiler area clear of debris and other
materials obstructing fl ow of combustion and
ventilation air.
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