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• Loosen the central heating drain cock 9
indicated in Fig. 9.6.
Main circuit
drain valve
Fig. 9.6
• To make draining easier, lift the plug 24
of the automatic relief valve in Fig. 9.7.
To help the draining of the primary circuit
loose the condensing heat exchanger air
purger valve 19 in Fig. 9.8.
Fig. 9.7
19
Fig. 9.8
MAINTENANCE
CLOSED
OPEN
9
24
9.5
Cleaning the condensing
primary exchanger and the
burner
Removing the fan burner unit 34 in Fig. 9.9.
N
P
Q
O
M
Fig. 9.9
• Remove the body's front panel and turn
the controls panel (see "Dismantling the
external panels" to page 69).
• Unscrew the connector L, remove the fix-
ing fork K and remove the pipe J.
• Unhook the silencer pipe.
• Insert a flat 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.
9.9).
• Disconnect the fan connector P by press-
ing the plastic hook Q positioned at the
bottom part of the connector (Fig. 9.9).
• Unscrew screws N and remove the fan
burner unit 34 (Fig. 9.9)
• Unscrew the N screw nuts and remove
34
K
J
L
- 71 -
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