PB Heat Peerless Combi 160, User Manual

Page: 87 / 107

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13.3 - Cleaning the
burner and primary
heat exchanger,
fl ue gas side
The burner and primary heat
exchanger must be cleaned every
year. To correctly clean the burner
and the fl ue gas side of the heat
exchanger follow the steps below:
1. follow the steps in section 13.2
to gain access the internal
components;
2. unscrew nut “D” from the gas valve
(taking care not to loose gasket “E”
in fi gure 68);
3. disconnect the two wires from the
ignition electrodes and the wire
from the fl ame detection electrode,
fi gure 1, details “18” and “47”;
4. disconnect the wire from safety
sensor “F” in fi gure 66;
5. unscrew the four nuts “C” in fi gure
66;
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;
Figure 66 - Remove the fan-burner assembly unit
13 - MAINTENANCE
7. remove the entire fan - burner
assembly, detail “A” in fi gure 66;
8. use a cylindrical brush with plastic
bristles to clean the inside of the
combustion chamber, detail “H” in
fi gure 66;
9. use a vacuum cleaner to remove
any unburned residue from the
combustion chamber, detail “H” in
fi gure 66;
10. using the same vacuum cleaner,
clean the surfaces of the burner
and around the electrodes;
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!
WARNING!!! while performing
the next step, carefully wash
only the inside of the combustion
chamber “H” of fi gure 66, 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!
11. using only water, wash the inside
of the combustion chamber, detail
“H” in fi gure 66. The water, will
drain into the condensate drain.
Clean the condensate trap (see
section 13.6) 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!