Potterton Paramount four Installation Manual page 55

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
7658013 - 02 - 15092016
ing on the heating demand. The pump strives to use the least energy pos­
sible 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 Example (Fig.)
Design volume flow
System resistance at the design point
=> Max. speed (read off)
=> Set parameter 883
2. Parameter 882 (Pump speed min)
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.)
Tab.19 Example (Fig.)
System resistance at the design point
=> Min. speed (read off)
=> Set parameter 882
Underfloor heating systems
The minimum pump speed for underfloor heating systems results
from 75% of the maximum pump speed.
Tab.20 Example (without illustration)
=> Max. speed (read off)
=> Min. speed (read off)
=> Set parameter 882
1500 2000
Wms Water mass flow
Paramount four 30 – 115 kW
8 Operation
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%
55