33
16
By---pass valve
16.1
Function
The By---pass valve
A
in Fig. 16.1 is located between
the c.h. water flow and return and its function is that of
guaranteeing a minimum flow across the primary heat
exchanger if the circulation across the c.h. system is
completely closed.
The By---pass valve is fitted on the rear side of the div-
erter group.
A
Fig. 16.1
16.2
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 8.4 of this manual.
4
Unscrew the connector
B
and remove the by---
pass valve
C
(Fig. 16.2).
C
B
Fig. 16.2
5
Reassemble the by---pass valve as illustrated in
Fig. 16.2 reversing the order of removal.