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

16

by-pass valve

16 .1 function

The By-pass valve A in Figure 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 circula-
tion across the c.h. system is completely closed.
The By-pass valve is fitted on the rear side of the diverter group.
figure 16 .1

16 .2 removal

warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
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
(Figure 16.2).
a
b
figure 16 .2
4 Reassemble the by-pass valve as illustrated in Figure 16.2
reversing the order of removal.
- 38 -
By-pass valve
a
warning: to lubricate the O-ring gaskets exclusively
use a silicone base grease compatible to be in con-
tact with foods and approved by the local water au-
thorities .
attention: when reassembling the by-pass valve be
sure that it is correctly oriented by matching the ref-
erence c with the notch d of the water group figure
16 .3 .
a
c
figure 16 .3
d