Emptying The C.h. System; Cleaning The Condensing Primary Exchanger And The Burner - Biasi ADVANCE 25C User Manual And Installation Instructions

10.5 Emptying the C.H. system

• Close the C.H. isolating valves (5 and 9
in Fig. 10.5).
• Loosen the central heating drain cock 12
indicated in Fig. 10.6.
Main circuit
drain valve
OPEN
Fig. 10.6
• To make draining easier, lift the plug 26 of
the automatic relief valve in Fig. 10.7.
Fig. 10.7
- 78 -
MAINTENANCE
CLOSED
12
26
10.6 Cleaning the condensing
primary exchanger and the
burner
Removing the fan burner unit 40 in Fig.
10.8.
N
P
Q
O
M
Fig. 10.8
• Remove the front panel and lower the
controls panel (see "Dismantling the ex-
ternal panels" on page 76).
• 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.
10.8).
• Disconnect the fan connector P by press-
ing the plastic hook Q positioned at the
40
K
J
L