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4.15 User circuit minimum water content
Heat pump units need a minimum water content inside the user circuit in order to guarantee the correct functioning
of the unit. A correct water content reduces the n° of starts-and-stops of the compressors and this extends the
operating life of the unit and allows a reduced reduction of the hot water temperature during the defrosting cycle.
For these reason it's necessary to guarantee to the unit the following minimum water contents in the user circuit:
Recommended water content : 15l/kW
Recommended minimum water content : 20 lt. x Thermal power ( kW ) / Number of compressors.
Model
Minimum water content winter mode (l)
4.16 Minimum domestic hot water circuit content
The minimum domestic hot water circuit content required is:
Model
Minimum water content hydraulic circuit (l)
The minimum domestic hot water circuit content shown in the above table shows the minimum water content
required by the system to guarantee the correct operation of the unit in terms of the acceptable number of starts
of the compressors and the minimum allowed working time per cycle. The above values do not guarantee the
availability and temperature of domestic hot water; the correct volume MUST be calculated based upon the
domestic hot water system type and on the user requirements. Please contact technical support team for informa-
tion regarding this.
4.17 Filling the hydraulic circuit
• Before filling, check that the installation drain valve is closed.
• Open all pipework, heat pump and terminal unit air vents.
• Open the shut off valves.
• Begin filling, slowly opening the water valve in the filling group outside the unit.
• When water begins to leak out of the terminal air vent valves, close them and continue filling until the pressure gauge indicates a pressure
of 1.5 bars.
The installation should be filled to a pressure of between 1 and 2 bars. It is recommended that this operation be repeated after the unit has
been operating for a number of hours (due to the presence of air bubbles in the system). The pressure of the installation should be checked
regularly and if it drops below 1 bar, the water content should be topped-up. If frequent top-ups are required, check all connections for leaks.
4.18 Emptying the installation
• Before emptying, place the mains switch in the "Off" position.
• Make sure the filling group valve is closed.
• Open the drainage valve outside the unit and all the installation and terminal air vent valves.
If the fluid in the circuit contains anti-freeze, it MUST not be allowed to run away to drain. It must be collected for
possible re-cycling or for correct disposal.
252
312
432
492
250
300
425
510
252
312
432
250
300
425
28
592
752
852
550
680
750
492
592
752
852
510
550
680
750
1002
1202
890
1025
1002
1202
890
1025
Rev. A 11-2020
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