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4.12 Hydraulic connections
The water pipe-work must be installed in accordance with national and local regulation and can be made from copper, steel, galvanized
steel or PVC. The Pipework must be designed to cater for the nominal water flow and the hydraulic pressure drops of the system, a maxi-
mum pressure drop of 300 Pa/m run being typical. All pipes must be insulated with closed-cell material of adequate thickness. The hydraulic
piping should includes:
• Pockets for temperature sensor to measure the temperature in the system.
• Flexible joints, to isolate the unit from the rest of the system.
• Temperature and pressure gauges for maintenance and servicing operations.
• Shut-off manual valves to isolate the unit from the hydraulic circuit.
• Metallic filters to be mounted on the inlet pipe with a mesh not larger than 1 mm.
• Vent valves, expansion tank with water filling, discharge valve.
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 Δt 8°C measured at the following
conditions:
4.13 Chemical 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
Heating mode: 7°C Dry bulb ambient temperature, 35°C water outlet temperature;
Cooling mode: 35°C dry bulb ambient temperature, 7°C water outlet temperature.
6-8
Lower Than 200 mV/ cm (25°C)
Lower Than 50 ppm
Lower Than 50 ppm
Lower Than 0,3 ppm
Total Hardness
Sulphur ion
Ammonia ion
Silicon ion
26
NO
OK
Lower Than 50 ppm
None
None
Lower Than 30 ppm
Rev. A 11-2020
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