Ariston NIMBUS COMPACT M NET 40 M EXT Technical Instructions For Installation And Maintenance page 53

Restrictions of cooling operation
A
25
(10 ; 23)
20
FC FC
15
10
UF UF
5
(10 ; 5)
0
0 5 10 15 20
A - Flow water temperature (°C)
B - External air temperature (°C)
AVAILABLE PRESSURE
Pressure available for distribution on the installation.
Graphic ( FS 1 ZONE)
900
800
700
600
500
400
300
200
100
0
0 500 800 950 1100
System Size Flowmeter OFF Threshold [l/h]
40 M EXT
50 M EXT
70 M EXT
70 M-T EXT
Available pressure
The curves indicated above show the available pressure of internal units.
In order to have a correct sizing of the system, the pressure drop curve of the entire circuit (in function of the nominal fl ow rate)
must stay below the available pressure curve everywhere. Pressure drop values depend on the specifi c installation.
You can install a supplementary circulation pump if the module's own unit is not powerful enough. For the electrical hookup, refer
to «Electrical circuit».
Warning: in case of installation of thermostatic valves on all terminals or zone valves, install a bypass to ensure the minimum
operating fl ow rate.
Heat Pump
4 kW
5 kW
7 kW
(43 ; 23)
(43 ; 5)
25 30 35 40 45
7 kW
4-5 kW
1250 1400 1550 1700 1850 2000 2300 5 5
l/h
280
350
490
490
Frequency min [Hz]
18
18
18
Restrictions of heating operation
A
-10,60
-20,45
-20,20
B
-30 -20 -10
50
Example 1: B = 35 and A = 33
Graphic ( FS 2 ZONE)
800
700
600
500
400
300
200
100
0
0 200
2500
Flowmeter ON Threshold [l/h]
360
450
630
630
Frequency max (heat) [Hz]
80
100
90
70
60
50
40
1
30
20
15,20
10
0
0 10 20
400 600 800 1000 1200
(l/h)
Nominal fl ow rate [l/h]
640
800
1120
1120
Frequency max (cool) [Hz]
65
80
70
53 / GB
35,60
35,33
B
30 40
1400