4 Piping installation
4.1 Water volume in heating system
In order to secure the defrosting of the outdoor unit, a minimum amount of water must be contained in the heating system. This is
shown in the table below.
If the heating system itself holds the amount of water described in the table, a volume tank is not needed, but recommended.
If the amount of water in the heating system is not sufficient, Low Pressure alarms may occur.
Volume tank table Unit 6 kW 9 kW 11 kW 13 kW 16 kW 18 kW
Min water volume in heating system. Atec Standard and
Atec Plus
l 120 180 220 260 320 360
Min water volume in heating system. Atec Total l 60 90 110 130 160 180
4.2 Minimum flow in the heating system
Make sure that the dimensioning of the piping in the heating system is sufficient to get the minimum flow presented below:
HP Size
6kW 9kW 11kW 13kW 16kW 18kW
l/min 7.9 11.5 14.5 16.7 19.8 23.7
Insufficient flow in the system may result in high pressure-, or low heat circulation flow alarms.
4.3 Noise and vibrations
4.3.1 Installation of the heat pump
To prevent disturbing noise from the heat pump the following recommendations should be observed:
▪
In the event the heat pump is positioned on a vibration sensitive base, vibration dampers should be used. The vibration dampers
must be correctly dimensioned with regard to the heat pump's weight so that static spring depression of at least 2 mm is obtained
in all mounting components. Vibration dampers are available to purchase as accessories.
▪
Connection of the heat transfer fluid to the heat pump must be made using a flexible hose to prevent transmission of vibration to
building construction and the pipe system, see Flexible hoses.
▪
Ensure that pipes at lead-ins are not lying against the walls.
▪
Ensure that the electrical supply cable does not provide a path for vibration because it is overstretched.
Planning guide
Atec
VIIFB102 Thermia Värmepumpar
14
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