Cleaning The Burner And Primary Heat Exchanger, Fl Ue Gas Side - Slant/Fin VSL-160B Installation Instructions Manual

14 - MAINTENANCE
14.3 - Cleaning the
burner and primary
heat exchanger,
fl ue gas side
Burner and primary heat exchanger
must be checked every year and
cleaned if required. To correctly clean
the burner and the fl ue gas side of
the heat exchanger follow the steps
below:
WARNING!!!
Before
proceeding to the next step,
verify that the electrical supply
to the boiler, and any other
electrical supply near the
boiler, is off. Failure to comply
with this warning can cause
extensive property damage,
severe personal injury or
death!
1. follow the steps in Section 14.2
to gain access to the sealing
chamber;
2. unscrew nut "D" (Figure 14-2) from
the gas valve (taking care not to
lose gasket "E" in Figure 14-4);
3. disconnect the two wires from the
ignition electrodes and the wire
from the fl ame detection electrode,
Figure 3-1, details "47" and "50";
4. disconnect the wire from safety
sensor "F" in Figure 14-2;
5. unscrew the four nuts "C" in Figure
14-2;
Figure 14-2 Remove the fan-burner assembly unit
6. prepare a suitable cover for the
gas valve outlet under nut "D" so
that no dirt, water, or other foreign
objects can fall into the gas valve
during cleaning;
7. remove the entire fan - burner
assembly, detail "A" in Figure 14-2;
8. use a cylindrical brush with plastic
bristles to clean the inside of the
combustion chamber, detail "H" in
Figure 14-2;
9. use a vacuum cleaner to remove
any unburned residue from the
combustion chamber "H" in fi gure
14-2;
10. using the same vacuum cleaner,
clean the surfaces of the burner
and around the electrodes;
WARNING!!!
while
performing the next step,
carefully wash only the inside
of the combustion chamber
"H" of Figure 14-2, and do not
get water on the outside of the
combustion chamber opening.
Failure to comply with this
warning can cause extensive
property damage, severe
personal injury or death!
87
11. using only water, wash the inside
of the combustion chamber, detail
"H" in Figure 14-2. The water, will
drain into the condensate drain.
Clean the condensate trap (see
Section 14.6) before reassembling
components;
12. reassemble the components by
proceeding in reverse order;
13. open the manual gas shutoff
valve;
14. restore electrical power to the
boiler;
15. check that there are no gas leaks.
WARNING!!!
Never use
an open fl ame to test for gas
leaks. Always use an approved
leak detection method. Failure
to comply with this warning
can cause extensive property
damage, severe personal injury
or death!