Xylem Aquontroller - Manual (Page 34)

en en en en
34
C
E
D
B
F
A
G
MMA
Ø
6
Model Model Model Model A A A A
mm mm mm mm
B B B B
mm mm mm mm
C C C C
mm mm mm mm
D D D D
mm mm mm mm
E EE E
mm mm mm mm
FFFF
mm mm mm mm
G G G G
mm mm mm mm
H H H H
mm mm mm mm
MMW07 MMW07 MMW07 MMW07 127 370 166 186 1” 1/4
MMW12 MMW12 MMW12 MMW12 127 370 166 186 1” 1/4
MMA07 MMA07 MMA07 MMA07 126 360 163 202 242 282 222 -
MMA12 MMA12 MMA12 MMA12 126 360 163 202 242 282 222 -
3
3 3 3 SELECTION GUIDE SELECTION GUIDE SELECTION GUIDE SELECTION GUIDE
For a correct selection of pump in the variable speed systems, all
operation range (Q-H) of pump must be considered (Fig. 3). As the
pump works, for the most part, a partial load, the best efficiency
point (
opt
η
) should not coincide with the point of maximum work
(Qmax). In a correct selection, the efficiency corresponding to the
maximum required flow (Qmax) shall not be less than 10% of the
value of maximum efficiency (
opt
η
).
Fig.3
Fig.2