Oil tank and line filters
Open the tanks drain cock and draw off any
accumulated water and sludge.
Turn off the oil supply. Remove the filter bowl and
clean the filter element with kerosene.
Condensing system
The secondary heat exchanger and condensate trap
must be inspected and cleaned as part of the annual
service schedule. The secondary heat exchanger is
built into the boiler and can only be accessed for
cleaning from the combustion chamber access cover.
See
fig 27
.
Remove the combustion chamber cover and
remove each of the baffle strips from the flue-ways.
Clean the baffle strips. The flue-ways can be
cleaned using a wire brush before vacuuming any
remaining deposits.
Remove the cleaning port plug from the top of the
boiler and clean within using a wire brush or
similar.
Check the condensate drainage system is not
blocked and retains a small quantity of water. If the
trap requires refilling, pour a small amount of water
into the cleaning port. The trap will have sufficient
water when water emerges from the drainage pipe.
Replace the baffle strips, ensuring each is firmly
pushed into the flue-ways. See
figs 28
&
29
.
Burner and combustion chamber
Ensure the electrical supply is switched off and
remove the burner. If the boiler uses a balanced
flue, remove the air hose first.
Remove the main combustion chamber baffles.
Using a wire brush, clean all carbon deposits from
the baffles and the internal surfaces of the
combustion chamber. Vacuum any remaining
deposits from the floor of the chamber.
Check the flue sealing gasket and the combustion
chamber cover gasket; replace if necessary.
Replace the baffles in the correct order. Failure to
do so will impede the correct operation of the
boiler. See
figs 28
&
29
for correct placement.
Replace the combustion chamber cover, ensuring
a gas-tight seal is formed.
Replace the burner nozzle (see the burner setup
leaflet for method).
Refit the burner and air hose (if removed).
Ensure the system is full of water and switch on the
electrical supply. If the system controls are calling
for heat; the burner should now fire.
Check the combustion settings against those in the
burner setup leaflet. Adjust the air intake levels and
oil pressure as necessary.
FIG. 27