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9.5
Cleaning the condensing
primary exchanger and the
burner
Removing the fan burner unit 29 in Fig. 9.6 .
N
Q
P
O
M
K
Fig. 9.6
• Remove the body's front panel and turn
the controls panel ( see "Dismantling the
external panels" to page 73 ).
• Unscrew the connectors L and K and re-
move the pipe J .
• Unhook the silencer pipe.
• Insert a fl at screwdriver in the connector
recess M and lever towards the bottom,
disconnect the connector at the same
time O by pulling towards the front O ( Fig.
9.6 ).
• Disconnect the fan connector Q by press-
MAINTENANCE
J
L
29
ing the plastic hook P positioned at the
bottom part of the connector ( Fig. 9.6 ).
• Unscrew screws N and remove the fan
burner unit 29 ( Fig. 9.6 )
• Remove the burner body by pulling to-
wards the outside.
If the condensate primary exchanger ele-
ments are dirty (notable only after removing
the burner body), brush them using a bristle
brush and remove the dirt using a suction
device.
The burner does not require any particular
maintenance, just remove dust using a bris-
tle brush.
More specifi c maintenance will be valuated
and carried out by an Authorised Assistance
Centre Technician.
Attention, to reassemble repeat
the operations carried out in re-
verse order. Be careful not to
damage the OR gasket of the
gas pipe when inserting the pipe
in Air box.
After any service operation on
the components of the gas cir-
cuit check all the connections
for gas leaks.
9.6
Check the pressure of the
heating expansion vessel
Drain the heating circuit as described in
section "Emptying the c.h. system" to page
74 and check that the expansion vessel
pressure is not less than 1 bar.
If the pressure is less, see to correct pres-
surisation.
- 75 -
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