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13.4 - Cleaning the
burner and primary
heat exchanger,
flue gas side
The burner and primary heat exchanger
must be cleaned every year. To
correctly clean the burner and the flue
gas side of the heat exchanger follow
the steps below:
follow the steps in section 13.2 or
13.3 to gain access the internal
components;
unscrew nut “D” from the gas valve
(taking care not to loose gasket “E”
in figure 48);
disconnect the wires from the
ignition electrodes and the wire from
the flame detection electrode, figure
1, details “18” and “47”;
disconnect the wire from safety
sensor “F” in figure 46;
unscrew the four nuts “C” in figure
46;
Figure 46
- Remove the fan-burner assembly unit
13 - MAINTENANCE
protect the gas valve outlet, from
entering any object or condensing
water;
remove the entire fan - burner
assembly, detail “A” in figure 46;
use a cylindrical brush with plastic
bristles to clean the inside of the
combustion chamber, detail “H” in
figure 46;
use a vacuum cleaner to remove any
unburned residue from the
combustion chamber, detail “H” in
figure 46;
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 figure 46, 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!
using only water, wash the inside of
the combustion chamber, detail “H” in
figure 46. The water, will drain into the
condensate drain;
reassemble the components by
proceeding in reverse order;
open the manual gas shutoff valve;
restore electrical power to the boiler;
check that there are no gas leaks.
WARNING!!! Never use an open
flame 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!
Summary of Contents for ONEX
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