Ferroli optima 2001 VMF7 Installation Instructions Manual page 12

Built-in Central Heating Water Circulating Pump
The pump head available for circulating the water is given in fig. 8.
N.B. - The pump is factory set at position 3. The pump is a Grundfos type 15-50 UPS series.
Grunfos Pump performance graph
Note - Minimum flow through boiler heat exchanger at any time should not fall below 6 litres per minute.
If required an additional expansion vessel may be fitted to the central heating return inlet.
If the total volume of water in the system exceeds 40 litres an additional expansion vessel must be fitted to
the central heating return inlet.
Pump performance curve Grundfos UPS 25-60
SAFETY VALVE
SETTING (bar)
VESSEL CHARGE
PRESSURE (bar)
INITIAL SYSTEM
1.0
PRESSURE (bar)
TOTAL WATER
EXPANSION VESSEL VOLUME (litres)
CONTENT of SYSTEM
LITRES
25 3.5
50 7.0
75 10.5
100 14.0
125 17.5
150 21.0
175 24.5
200 28.0
For syst. volumes other than
those given above, mult. the syst. 0.140
volume by the factor across
12
3.0
0.5 1.0
1.5 2.0 1.5 2.0
6.5 13.7 4.7 10.3
12.9 27.5 9.5 20.6
19.4 41.3 14.2 30.9
25.9 55.1 19.0 41.2
32.4 68.9 23.7 51.5
38.8 82.6 28.5 61.8
45.3 96.4 33.2 72.1
51.8 110.2 38.0 82.4
0.259 0.551 0.190 0.412
2001
1 2 3 Speed settings
A Boiler pressure drop
B Max. available pump head C.H.
Fig. 8
SIZING OF ADDITIONAL EXPANSION VESSELS:
Deduct from the value given in the table the 7 litre vessel supplied.
1.5
Note
1. Fill C.H. installation to min. 1.5 bar.
2.0
2. Select by preference the expansion vessel for increased
system pressure of 2.0 bar
3. Expansion vessel must be fitted to Central Heating
Return Inlet
8.3
4. The standard 7 litres expansion vessel is charged to 1
16.5
bar
24.8
33.1
41.3
49.6
57.9
66.2
0.33
Fig. 9