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13 - MAINTENANCE
Figure 45 - Supply fi ttings removal (only for
160-C model)
Figure 46 - 3-way valve servomotor removal
13.9 - 3-way valve
removal
The 3-way valve, details "M" and
"Q" in fi gures 45 and 46, directs hot
water produced by the primary heat
exchanger to the heating circuit or to
the secondary heat exchanger for the
production of D.H.W. To replace or
clean it, follow the steps below while
referring to fi gures 45 and 46:
1. follow the steps in section 13.10 to
isolate and drain the water from the
boiler;
2. follow the steps in section 13.2,
to gain access the internal
components;
3. disconnect fi ttings "A";
4. remove screws "C";
5. rotate "D" fl ange in the sense of the
black arrow (See particular fi g. 1);
6. remove the bracket "E";
5. remove fi tting "F";
6. remove fi tting "L";
7. remove fi tting "M" and check its
state.
8. remove spring "N";
9. remove servomotor "O";
10. remove the fi tting "P"
11. remove the spring "Q" and check
for any dirty.
63
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