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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.
Grundfos 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 15-50
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
0.140
those given above, mult. the syst.
volume by the factor across
14
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
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
2.0
1. Fill C.H. installation to min. 1.5 bar.
2. Select by preference the expansion vessel for
increased system pressure of 2.0 bar
3. Expansion vessel must be fitted to Central Heating
8.3
Return Inlet
16.5
4. The standard 7 litres expansion vessel is charged
24.8
to 1 bar
33.1
41.3
49.6
57.9
66.2
0.33
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