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9.6
Emptying the c.h. system
• Close the c.h. isolating valves (3 and 7 in
Fig. 9.9).
• Loosen the central heating drain cock 9 indi-
cated in Fig. 9.10.
Main circuit
drain valve
Fig. 9.10
• To make draining easier, unscrew the plug
31 of the automatic relief valve in Fig. 9.11.
• A small quantity of water will remain in the
d.h.w. heat exchanger after draining. If the
boiler is being drained to prevent freezing,
the d.h.w. heat exchanger must be removed
and inverted to drain fully or an antifreeze
solution added.
Fig. 9.11
MAINTENANCE
CLOSED
OPEN
9
31
9.7
Cleaning the condensing prima-
ry exchanger and the burner
Removing the fan burner unit 46 in Fig. 9.12.
Q
N
O
M
P
Fig. 9.12
• Remove the body's front panel and turn the
controls panel (see "Dismantling the exter-
nal panels" to page 81).
• Unscrew the connector L, remove the fixing
fork K and remove the pipe J.
• Unhook the silencer pipe.
• Insert a flat screwdriver in the connector re-
cess P and lever towards the bottom, dis-
connect the connector at the same time M
by pulling towards the front M (Fig. 9.12).
• Disconnect the fan connector N by pressing
the plastic hook O positioned at the bottom
part of the connector (Fig. 9.12).
• Unscrew screws Q and remove the fan
burner unit 46 (Fig. 9.12)
• Unscrew the Q screw nuts and remove the
burner group fan 46 (Fig. 9.12)
• Extract the burner casing by pulling it out-
wards.
46
K
J
L
- 83 -
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