Function; Removal; By -- Pass Valve - Biasi RIVA ADVANCE HE M110B.24SM/C Service Manual

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.
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.
36
A
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. 16.2) (Fig. 16.3).
B
C
Fig. 16.2
Fig. 16.3
5 Reassemble the by---pass valve as illustrated in
Fig. 16.2 --- Fig. 16.3 reversing the order of re-
moval.
C B