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2.05 Pump characteristics
The pump head available for circulating the water is given
in fi g. 5.
N.B. - The pump is factory set at position 3. The pump is a
Grundfos type 15-50 UPS series.
Grundfos Pump per formance graph
Note - Minimum fl ow through boiler heat exchanger at any
time should not fall below 6 litres per minute.
If the total volume of water in the system exceeds 40 litres
an additional expansion vessel must be fi tted to the central
heating return pipe.
1 2 3
Speed settings
A
Boilers pressure drop
B
Available pump head C.H.
SIZING OF ADDITIONAL EXPANSION VESSELS:
Deduct from the value given in the table the 8 litre
vessel supplied.
Note:
1.
Fill C.H. installation to min. 1.5 bar.
2.
Expansion vessel must be fi tted to central
heating return pipe.
3.
The standard 7 litre expansion vessel is
charged to 1 bar.
4.
The additional expansion vessel should be
charged to 1 bar.
H
Pressure loss diagram
8
TEMPRA 24
8
mbar x 100
7
6
5
4
3
2
1
0
0.5
Fig. 5
SAFETY VALVE
SETTING (bar)
VESSEL CHARGE
PRESSURE (bar)
INITIAL SYSTEM
PRESSURE (bar)
TOTAL WATER
CONTENT of SYSTEM
LITRES
25
50
75
100
125
150
175
200
For syst. volumes other than
those given above, mult. the syst.
volume by the factor across
1
1.5
2
2.5
3.0
0.5
1.0
1.0
1.5
2.0
1.5
EXPANSION VESSEL VOLUME (litres)
3.5
6.5
13.7
4.7
7.0
12.9
27.5
9.5
10.5
19.4
41.3
14.2
14.0
25.9
55.1
19.0
17.5
32.4
68.9
23.7
21.0
38.8
82.6
28.5
24.5
45.3
96.4
33.2
28.0
51.8
110.2
38.0
0.140
0.259
0.551
0.190
Fig. 6
Q
3
m |h
1.5
2.0
2.0
10.3
8.3
20.6
16.5
30.9
24.8
41.2
33.1
51.5
41.3
61.8
49.6
72.1
57.9
82.4
66.2
0.412
0.33
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