99
Figure 17-4
Remove the air inlet silencer
17 - MAINTENANCE
17.3 - Cleaning the
burner and primary
heat exchanger,
flue gas side
Burner and primary heat exchanger
must be checked every year and
cleaned if ther’is presence of debris
or products of the combustion. To
correctly clean the burner and the flue
gas side of the heat exchanger follow
the steps below:
WARNING!!!
Before
proceeding to the next step,
verify that the electrical supply
to the heater, and any other
electrical supply near the
heater, is off. Verify that the
manual gas shut off valve
is closed. Failure to comply
with this warning can cause
extensive property damage,
severe personal injury or death!
1. follow the steps in Section 17.2
to gain access to the internal
components;
2. for units 399 and 500, prepare a
suitable cover for the burner units
below your actual site (if any) so
that no dirt, water, or other foreign
objects can fall into the burner unit
below;
3. loosen screws “D” (Figure 17-3) and
move up the spark generator “A”
(Figure 17-3);
4. disconnect the two wires “D” (Figure
17-4) from the ignition electrodes
and the wire “E” (Figure 17-4) from
the flame detection electrode;
5. rotate the air inlet silencer “B”
(Figure 17-4) in the up direction;
6. pull in the left direction “C” (Figure
17-4) the air inlet silencer and
remove it from the fan;
7. unscrew nut “H” (Figure 17-5). Pay
attention to the gasket between nut
“H” (Figure 17-5) and the gas valve.
8. take away the spring “A” as per
Figure 17-5. Help yourself with a
screwdriver;
9. remove the electrical plug from the
gas valve;
10. Remove the gas valve from its
position (see Figure 17-6). Take
care attention to the o-ring “L” of
Figure 17-6;
D
D
A
020009.01.012
D
B
E C
A
020009.01.014
Figure 17-3
Remove the spark generator
Содержание Esteem 399
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