Unical PK 300 X 2S Instruction Manual Page 21

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21
Instructions for the installer
Perdita di carico lato acqua
0
0,5
1
1,5
2
2,5
3
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000 21000 22000 23000 24000
Q : portata acqua (l/h)
perdita di carico (mmh2O)
PK150X 2S
230 300 348
8994
11781
13660
11992 15708
18213
150
5870
7826
Power supply in kW
Max flow rate
demanded in l/h
( t=15 K)
Δ
Nominal flow rate
requested in l/h ( t=20 K)
Δ
3.12 - DETERMINATION OF PRIMARY CIRCUIT PUMP OR BOILER SYSTEM PUMP
The boiler pump must have a delivery head which can
ensure the water flow rate as shown in the graph "Water
pressure losses".
The following table gives an indication of the pump's flow
rate in function of the ?t of the primary circuit.
The size of the pumps must be determined
by installers or technical engineers accor-
ding to boiler data and system design.
The water side resistance curve of the boiler
is shown in the following graph.
The pump is not an integral part of the boiler.
We recommend you choose a pump with the
rate and discharge head at about 2/3 of its
characteristic curve.
Q: water flow rate (l/h)
WATER SIDE PRESSURE LOSSES
Pressure losses (mmH2O)
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