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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.
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 .
- 40 -
BY-PASS VALVE
A
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
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