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Hydraulic circuit
The maximum piping length depends on the maximum pressure availability in the water outlet pipe. Please check
the pump curves.
9
8
7
6
5
4
3
2
1
0
1
AU082FYCRA(HW)
Air purging
•The hydraulic system should be equipped with an air purger at the highest location of the system. If this location
is not the highest of the water installation, air might be trapped inside the water pipes, which could cause system
malfunction. In that case additional air purgers (field supplied) should be installed to ensure no air enters the water
circuit. It should be installed as below:
•For heating floor system, the air should be purged by means of an external pump and an open circuit to avoid air
bags.
Anti- freezing
•When the unit is stopped during shut-off periods and the ambient temperature is very low, the water inside the
pipes and the circulating pump may freeze, thus damaging the pipes and the water pump. In these cases, the
installer shall ensure that the water temperature inside the pipes does not fall below the freezing point. In order to
prevent this, the unit has a self-protection mechanism which should be activated
•Additionally, in cases where water drainage is difficult, an anti freeze mixture of glycol (ethylene or propylene)
should be used (content between 10% to 40%). The performance of the unit working with glycol may decrease in
proportion to the percentage of glycol used, since the density of glycol is higher than that of the water.
2
3
3
Q (m
/h)
≥4DN
14
12
10
8
6
4
2
0
1
2
4
AU112FYCRA(HW)
AU162FYCRA(HW)
48
3
4
5
6
7
3
Q (m
/h)
8
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