Potterton Paramount five 50 Installation Manual page 60

8 Operation
Fig.19 Example of total dynamic head
8
100%
7
6
5
4
60%
50%
3
40%
2
30%
20%
10%
1
0%
0
0
Rfh Total dynamic head
60 Paramount five 30 – 115
The pump inside the boiler is actuated by parameter 2320 (Pump
modulation) with the modulation setting "Demand". This means that it
modulates between the set minimum and maximum pump speed
depending on the heating demand. The pump strives to use the least
energy possible to supply the heating circuit.
500 1000
900
Wms [kg/h]
1. Parameter 883 (Pump speed max)
The max. pump speed results from the design volume flow and the
total dynamic head required at this point (see Fig.).
Tab.18
Design volume flow
System resistance at the design point
=> Max. speed (read off)
=> Set parameter 883
2. Parameter 882 (Pump speed min)
2.1. Heating systems with radiators
The minimum pump speed for heating systems with radiators is
the result of entering the system resistance again at volume
flow zero l/h in the diagram (see Fig.)
2.2. Underfloor heating systems
The minimum pump speed for underfloor heating systems
results from 75% of the maximum pump speed.
For more information, see
Total dynamic head Paramount, page 17
1500 2000
Wms Water mass flow
Example (Fig.)
Tab.19 Example (Fig.)
System resistance at the design
point
=> Min. speed (read off)
=> Set parameter 882
Tab.20 Example (without illustration)
=> Max. speed (read off)
=> Min. speed (read off)
=> Set parameter 882
2500
RA-0000428
900 l/h
19 kPa (1.9 mWS)
50%
50%
19 kPa (1.9 mWS)
30%
30%
50%
0.75 * 50% = 37.5%
37%
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