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

cocks.
9.5

Emptying the c.h. system

• Close the c.h. isolating valves (4 and 8 in
Fig. 9.5).
• Loosen the central heating drain cock 10
indicated in Fig. 9.6.
Main circuit
drain valve
Fig. 9.6
• To make draining easier, lift the plug 27
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 18 in Fig. 9.8.
Fig. 9.7
- 78 -
MAINTENANCE
CLOSED
OPEN
10
27
18
Fig. 9.8
9.6 Cleaning the condensing
primary exchanger and the
burner
Removing the fan burner unit 41 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 76).
• Unscrew the connector L, remove the fix-
ing fork K and remove the pipe J.
41
K
J
L