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16
By---pass valve
16.1
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.
Fig. 65
34
A
16.2
Removal
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.
Unscrew the connector B and remove the by---
4
pass valve C (Fig. 66).
B
C
Fig. 66
5
Reassemble the by---pass valve as illustrated in
Fig. 66 reversing the order of removal.
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