Potterton Paramount five 115, Руководство по установке, Страница: 60 / 156

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.
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)
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.)
Tab.19 Example (Fig.)
System resistance at the design
point
19 kPa (1.9 mWS)
=> Min. speed (read off) 30%
=> Set parameter 882 30%
2.2. 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%
For more information, see
Total dynamic head Paramount, page 17
8 Operation
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