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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.
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 reference C with
the notch d of the water group figure 16.3
A
C
figure 16.3
d
- 39 -
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