121
INSTALLATION
INSTALLATION
2.8.1
System water content and flow rate
In order to ensure the device's proper operation, a minimum volume of water must be guaranteed within the system's primary
circuit. It also provides for the following advantages:
− decreased wear to the device
− increased system yield
− improved temperature stability and precision.
9
This minimum volume is necessary in order to prevent the formation of ice during defrosting operations, or the continuous
modulation of the compressor's frequency.
The tables below list the minimum volumes calculated according to the following conditions:
− heat transfer fluid temperature in the water exchanger = 12°C / 7°C
− inlet air temperature in the air exchanger = 35°C.
NXC models - Minimum volumes
NXH models - Minimum volumes
Description
NXC
044
048
056
064
072
084
096
104
122
142
164
Minimum water volume in the system,
for air-conditioning application
121
140
164
182
207
243
181
205
240
204
240
L
Water exchanger minimum flow rate
without hydronic module
(1)
0.9
0.9
0.9
0.9
1
1.2
1.3
1.5
1.7
2
2.3
l/s
Water exchanger maximum flow rate
without hydronic module
(1)
3
3.4
4.2
5
5
5.5
6.8
7.7
8.5
10.6
11.2
l/s
Water exchanger maximum flow rate,
double pump
(2)
(Low pressure
(3)
)
2.9
3.2
3.7
4.1
4.1
4.4
5.1
6.3
6.5
7.9
8.2
l/s
Water exchanger maximum flow rate,
double pump
(2)
(High pressure
(3)
)
3.4
3.8
4.4
5
5
5.2
6.2
6.5
8
8.7
8.9
l/s
Description
NXH
044
048
056
064
072
080
084
096
104
122
142
164
Minimum water volume in the system,
for air-conditioning application
202
234
274
303
346
405
405
301
342
400
340
401
L
Water exchanger minimum flow rate
without hydronic module
(1)
0.9
0.9
0.9
0.9
1
1.2
1.2
1.3
1.5
1.7
2
2.3
l/s
Water exchanger maximum flow rate
without hydronic module
(1)
3
3.4
4.2
5
5
5.5
6.8
6.8
7.7
8.5
10.6
11.2
l/s
Water exchanger maximum flow rate,
double pump
(2)
(Low pressure
(3)
)
2.9
3.2
3.7
4.1
4.1
4.4
5.1
5.1
6.3
6.5
7.9
8.2
l/s
Water exchanger maximum flow rate,
double pump
(2)
(High pressure
(3)
)
3.4
3.8
4.4
5
5
5.2
6.2
6.2
6.5
8
8.7
8.9
l/s
(1) Maximum flow rate for pressure drop of 100 kPa in the water exchanger
(2) Maximum flow rate for available pressure of 20 kPa (units with low pressure pumps) or 50 kPa (high pressure).
(3) Maximum flow rate for single pump 2 to 4% higher according to size.
9
For the Backup Tank Module option, consider tank volume: 250 litres.
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