15
English
4 - Installation
4.3 Water connections
The flow switch and the filter water, although not included in the
supply, must always be fitted such as plant components.
Their installation is mandatory for warranty.
WARNING
The attachments at the water inlet and outlet
shall be connected in compliance with the
instructions which can be found on the labels in
the proximity of the attachments.
Connect the water lines of the plants with the attachments of the unit
whose diameters and positions are shown in Chapter 9.
4.4 Defrost water drainage
When heat pump units work in heating mode, during defrosting
cycles, they may discharge water from the base. This is why the
units should be installed at least 200 mm above the floor level, so
as to allow the free drainage of waste water, without the risk of
producing ice banks.
The heat pump units must be installed in positions where the
defrosting water cannot create any damage.
4.5 Water buffer tank
The accumulation tank which has been designed to be mounted on
units is complete with all the hydraulic and electrical components
required for the correct operation of the system.
These systems are carefully assembled and tested at works. They
are ready for operation after having correctly realised all electrical
and hydraulic connections.
WARNING
Don’t leave the unit with water inside the circuit
during the winter or when it is in stand by,
unless water is properly mixed with glycol.
4.5.1 Features
Units have one single tank. The kit will include an Antifreeze Electric
Heater, a drain valve, an automatic filling unit and an automatic air
vent.
No pump is arranged on the kit since it is mounted on the unit.
A tank arranged for mounting a heating booster resistance kit may be
optionally required (5 traps).
The tank is completely insulated with 30 Kg/m
3
closed cell
polyethylene in a silver colour and enclosed by a bearing structure
made of passivated and painted plates. The box is equipped with
bulkheads which can be easily opened for internal inspection.
The kit is installed beneath the unit. It is an integral part of the unit
without changing the support area.
4.5.2 Supplied Material
The kits will be supplied with pipelines ready for installation. An
antifreeze resistance with wiring, an automatic water filling valve, a
3 bar safety valve, a drain valve and a vent valve have already been
assembled.
Hydrokit is shipped with a film to protect it from atmospheric agents.
Packaging has been designed in order to stack it up.
4.5.3 Antifreeze Electric Heater
The antifreeze resistance of the tank (TEH) shall be wired with the
panel as it is shown by the diagram attached to the unit.
4.5.4 Water Filter
The kit will use the water filter of the unit.
RECOMMENDED WATER COMPOSITION
PH 7,5 - 9
Electrical conductivity 10 - 500 μS/cm
Total hardness 4,5 - 8,5 dH
Temperature < 60 [°C]
Alkalinity (HCO
3
-
) 70-300 ppm
Alkalinity / Sulphates (HCO
3
-
/ SO
4
2-
) > 1 ppm
Sulphates (SO
4
2-
) < 70 ppm
Chlorides (Cl
-
) < 50 ppm
Free Chlorine < 0,5 ppm
Phosphates (PO
4
3-
) < 2 ppm
Ammonia (NH
3
) < 0,5 ppm
Ammonium Ion (NH
4
+
) < 2 ppm
Manganese Ion (Mn
2+
) < 0,05 ppm
Free Carbon Dioxide (CO
2
) < 5 ppm
Hydrogen Sufide (H
2
S) < 0,05 ppm
Oxygen Content < 0,1 ppm
Nitrates (NO
3
-
) < 100 ppm
Manganese (Mn) < 0,1 ppm
Iron (Fe) < 0,2 ppm
Aluminium (Al) < 0,2 ppm
Caution
If the water circuit is to be drained for a time exceeding one month, the
circuit must be fully charged with nitrogen to prevent any risk of corrosion
by differential venting
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