Technical data
12
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• The water circulating pumps in the HYDROFLOW
module are sized to cover the widest application range.
For this reason it is essential to install a water flow
controller in the hydraulic circuit to maintain the water
flow at the desired flow rate. With the pressure loss
generated by the water flow controller in the water circuit,
the controller must be able to impose the system pressure/
flow curve on the pump pressure/flow curve, to obtain the
desired operating point.
• The pressure gauge installed on the pump, together with
the isolating valves upstream and downstream, allows the
pressures upstream and downstream of the pump to be
read.
• Using the total pressure difference read, the water flow
rate for the installation is taken from the pressure/flow
curve for the pump alone. This flow rate is adjusted with
the flow controller and reading the flow rate from the
corresponding curves.
If the water circuit has a pressure drop that is higher than the
pressure available from the HYDROFLOW unit, the water
flow rate will be reduced, and the difference between the
HYDROFLOW module water entering and leaving
temperatures will increase.
To reduce the pressure drop in the hydraulic circuit:
• minimize the individual pressure drops in number and size
(elbows, bends, accessories).
• use correctly sized piping.
• avoid extensions and branches in the water circuit as much
as possible
Water loop volume
The unit includes an integrated buffer tank. A supplementary
buffer tank should be installed, if the built-in buffer tank does
not supply sufficient capacity (see chapter Water loop volume
under Application Data for the standard unit on page 11.
Available static pressure for HYDROFLOW units (30GH/GZ 015-025)
Available static pressure for HYDROFLOW units (30GH/GZ 030, 035)
150
140
130
120
110
100
90
80
70
60
0
15
14
13
12
11
10
1
4
3
2
0
kPa m WG
50
40
30
20
10
6
9
8
7
5
5
1,39
10
2,78
15
4,17
20
5,56
m
3
/h.
I/s.
025
015
020
150
140
130
120
110
100
90
80
70
60
0
15
14
13
12
11
10
1
4
3
2
0
kPa m WG
50
40
30
20
10
6
9
8
7
5
5
1,39
10
2,78
15
4,17
20
5,56
25
6,95
m
3
/h.
I/s.
035
030