ing on the heating demand. The pump strives to use the least energy pos
sible to supply the heating circuit.
Fig.19 Example of total dynamic head
0
1
2
3
4
5
6
7
8
0
500
1000
1500
2000
2500
R
fh
[
m
W
S
]
Wms [kg/h]
100%
60%
50%
40%
30%
20%
10%
0%
900
RA-0000428
Rfh Total dynamic head
Wms Water mass flow
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
900 l/h
System resistance at the design point
19 kPa (1.9 mWS)
=> Max. speed (read off)
50%
=> Set parameter 883
50%
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
19 kPa (1.9 mWS)
=> Min. speed (read off)
30%
=> Set parameter 882
30%
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)
50%
=> Min. speed (read off)
0.75 * 50% = 37.5%
=> Set parameter 882
37%
8 Operation
7658013 - 02 - 15092016
Paramount four 30 – 115 kW
55