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System return water must be fitted to the connection labelled: "USER WATER IN" as incorrect connection can
damage the heat exchanger by freezing.
It is compulsory to install on the USER WATER IN connection, a water strainer with a mesh not larger than 1 mm. Fitting
this filter is COMPULSORY and the warranty will be invalidated if it is removed. The filter must be kept clean and checked
periodically.
All units are factory supplied with a flow switch; the flow switch MUST BE FITTED in the pipework connection
labelled "USER WATER OUT". If the flow switch is altered, removed, or the water filter omitted on the unit, the
warranty will be invalidated.
The water flow through the heat exchangers of the unit should not be fall below dt 8°C measured at the following
conditions:
C
HEMICAL CHARACTERISTICS OF THE WATER
The system is to be filled with clean water and vented after a full flushing operation has been performed; the water should have the following
characteristics:
PH
Electric conductibility
Chlorine ions
Sulphuric acid ions
Total Iron
U
SER CIRCUIT MINIMUM WATER CONTENT
Like any refrigerant unit also the heat pumps need a minimum water content in the user hydraulic circuit to guarantee
correct operation of the unit, avoiding a high numbers of start and stop of the compressors that can reduce the
working life of the unit.
Model
Minimum water content (l)
Safety valve (bar)
Page | 25
Heating mode: 10/7°C Dry bulb ambient temperature
Cooling mode: 30/35°C dry bulb ambient temperature
6-8
Lower Than 200 mV/ cm (25°C)
Lower Than 50 ppm
Lower Than 50 ppm
Lower Than 0,3 ppm
302
402
602
500
600
750
6
6
6
35°C water outlet temperature
7°C water outlet temperature.
Total Hardness
Sulphur ion
Ammonia ion
Silicon ion
702
902
1202
850
1200
1500
6
6
6
Lower Than 50 ppm
None
None
Lower Than 30 ppm
1402
1804
2304
1700
1200
1500
6
6
6
2604
1700
6
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