Function; Removal - Biasi RIVA COMPACT M90E.24S Service Manual

16 By---pass valve
16.1

Function

The By---pass valve A in Fig. 64 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. 64
A
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.
Unscrew the connector B and remove the by---
4
pass valve C (Fig. 65).
B
C
Fig. 65
5 Reassemble the by---pass valve as illustrated in
Fig. 65 reversing the order of removal.
33