Removal - Biasi Activ A 25C 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.
2 Empty the primary circuit of the boiler.
3 Remove the locking plate B and pull up the by---
pass valve A (Fig. 16.2).
A
A
B
Fig. 16.2
4 Reassemble the by---pass valve as illustrated in
Fig. 16.2 reversing the order of removal.
Warning: to lubricate the O-- ring gaskets
exclusively use a silicone base grease
compatible to be in contact with foods and
approved by the local water Authorities.
Attention. When reassembling the By -- pass valve
be sure that it is correctly oriented by matching the
reference C with the notch D of the water group
Fig. 16.3
A
C
Fig. 16.3
D
37