32
17
By---pass valve
17.1
Function
The By---pass valve
A
in Fig. 65 is located between the
c.h. water flow and return and its function is that of guar-
anteeing a minimum flow across the primary heat ex-
changer if the circulation across the c.h. system is com-
pletely closed.
The By---pass valve is fitted on the rear side of the div-
erter group.
A
Fig. 65
17.2
Removal
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1
Remove all the case panels.
2
Empty the primary circuit of the boiler.
3
Remove the diverter group as described in the
section 9.4 of this manual.
4
Unscrew the connector
B
and remove the by---
pass valve
C
(Fig. 66).
C
B
Fig. 66
5
Reassemble the by---pass valve as illustrated in
Fig. 66 reversing the order of removal.
