Determining The Primary Circuit Pump Or Boiler Pump - Immergas ARES 440 TEC ERP Instructions And Warnings

3.9 DETERMINING THE PRIMARY
CIRCUIT PUMP OR BOILER PUMP
Immergas provides a series of primary rings complete with an accurately
sized pump, if alternative solutions are being used, the boiler pump
must have a head that is capable of ensuring the flow rates represented
in the "Water side head losses" graph.
The table below roughly indicates the flow rates of the pump based
on the Δt of the primary circuit if the installation is equipped with a
hydraulic separator.
Power in kW
Maximum flow rate in l/h (Δt = 15 K)
Nominal requested flow rate in l/h (Δt = 20 K)
6
5,8
5,6
5,4
5,2
5
4,8
4,6
4,4
4,2
4
3,8
3,6
3,4
3,2
3
2,8
2,6
2,4
2,2
2
1,8
1,6
1,4
1,2
1
0,8
0,6
0,4
0,2
0
4000 6000 8000 10000
0 2000
EXAMPLE:
For a ΔT 20K, of an ARES 900 Tec the maximum
required flow rate is 36,289 l/h.
From the head loss graph it is possible to deduce that
the pump must ensure a head of at least 1.8 m/H
440
24326
18243
12000 14000 16000 18000 20000 22000 24000
Portata (l/h)
Flow rate (l/h)
Instructions for the installer
The pumps must be determined by the installer or
designer based on the data for the boiler and system.
The resistance curve on the water side of the boiler is
represented in the table provided below.
The pump is not an integral part of the boiler.
It is advisable to choose a pump with a flow rate and
head of approximately 2/3 of its typical curve.
550 660
30404 36487
22804 27365
440
550
28000 30000 32000 34000 36000
NOTE: It is always advisable to set up a hydraulic compensator
between the boiler circuit and the system circuit. It becomes
ESSENTIAL if the system requires greater flow rates than the
maximum allowed by the boiler, i.e. ∆t below 15K.
O.
2
23
770
42570
31926
660
770
900
38000 40000 42000 44000 46000 48000 50000
900
48647
36487
52000 54000