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9.6 HYDRAULIC CONNECTIONS
The hydraulic connections have to be installed in accordance with national and local regulations. Pipes can be made up of
multilayer pipe, polyethylene or stainless steel and must withstand at least 100°C and 10 bar. Pipes have to be designed
depending on the desired water flow and on the hydraulic pressure drops of the system. All pipes have to be insulated with
closed-cell material of adequate thickness. Units should be connected to piping by means of flexible joints. Piping should include:
•
Y-shaped metallic filter (to be mounted on the inlet pipe) with a mesh not larger than 1mm.
•
Automatic charging group (3 bar advised) when water supply pressure is higher than 5,5 bar.
•
Hydraulic safety group (7 bar).
•
Manual gate valves to separate the unit from the hydraulic circuit.
•
Manual gate valve on the inlet pipe to discharge the unit if necessary.
•
Thermometers for wells to monitor the system's temperature.
•
Expansion tanks, safety valves and air vents where indicated in the following installation diagrams.
Perform the connections making sure that weight of the pipes do not overload the unit.
Check the water hardness, which should not be below 15°f. With particularly hard water, it's recommended the use
of a water softener so that the residual hardness is no more than 20°f and no less than 15°f.
WARNING: When it's possible, connect the pipes to the hydraulic connections always using the system key against
key.
WARNING: Unit water inlet pipe have to be in correspondence with the blue connection, otherwise the unit
malfunction could occur.
WARNING: It is compulsory to install on the WATER INLET connection a metallic filter with a mesh not larger than 1
mm. Should the filter not be installed, the warranty will no longer be valid. The filter have to be kept clean, so
make sure it is clean after the unit has been installed, and then check it periodically.
WARNING: if an external pump is installed and connected to the system (for hot sanitary water circuitation or solar
water circuitation) it is recommended to install and connect also a flow switch before the pump. If not, any damage
to the pump will not be signalled and the system malfunction could occur.
Perform the drainage/piping work according to the installation instruction. If there is a defect in the
drainage/piping work, water could leak from the unit and household goods could get wet and be damaged.
The hot water needs to mix with cold water for terminal usage, too hot water (over 50°C) in the heating unit may
cause injury. It's recommended the use of anti-scald valves.
The diagrams are to be considered only for indication purpose. It is always required the study of the specific
installation context and the approval of the system by a qualified heating engineer designer.
9.6.1 Water connections
Please pay attention to the below points when connecting the water loop pipe:
1) Try to reduce the water loop resistance.
2) Make sure there is nothing in the pipe and the water loop is smooth, check the pipe carefully to see if there is any leak, and
then pack the pipe with the insulation.
3) Install the hydraulic safety group in the water inlet.
4) Install also an expansion tank suitably sized to absorbe volume variations.
5) The nominal pipe diametere must be selected on the basis of the available water pressure and the expected pressure drop
within the piping system.
6) The water pipes may be of the flexible type. To prevent corrosion damage, make sure that the materials used in the piping
system are compatible.
7) When installing the pipe-work on the customers' site, any contamination of the piping system must be avoided.
9.6.2 Water loading
If the unit is used for the first time or used again after emptying the tank, please make sure that the tank is full of water before
turning on the power.
1) Open the cold water inlet and hot water outlet.
2) Start the water loading. When there is water normally flowing out from the hot water outlet, the tank is full.
3) Turn off the hot water outlet valve and water loading is finished.
ATTENTION: Operation without water in water tank may result in damage of auxiliary e-heater.
UNICA
Sanitary water heat pump
17
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