INSTALLATION | Appliance installation
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1 SSP snow cover
10.3 Connecting the heat sink system
i
Information
The hydraulic connection from the heat sink system
(WNA) to the heat pump may be made only by a
qualified contractor.
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Information
For maintenance purposes, a cut-off valve should
be fitted to every hydraulic line close to the con
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nection point on the heat pump.
In the case of air/water heat pumps, an appropriately di-
mensioned heat pump buffer tank is essential, in order to
provide the necessary energy for defrosting the outdoor
unit.
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The pipe network and the pumps should be correctly
dimensioned for your heating system and according
to the technical data for your heat pump.
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A (manual) air vent valve must be fitted at the highest
point in the pipework.
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At the lowest point in the pipework, fit a drain pipe to
allow the system to be drained.
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Ensure that no foreign bodies (dust, dirt etc.) can en-
ter the pipework.
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A guard (strainer) can be installed in the return line of
the heat pump to catch dirt.
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Information
Ensure that the guard is easy to clean for mainte-
nance purposes. A heavily soiled strainer can lead
to a high pressure safety shutdown or to a malfunc-
tion shutdown based on flow metering (heat sink).
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Information
Ensure that the flow velocity in the pipe network
does not exceed 0.8 m/s, as this can cause in-
creased noise emissions.
10.3.1 Connecting the heating water
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Before connecting the heat pump, flush the pipework
through with filtered flushing water in accordance with
standard procedures. Foreign bodies such as rust,
sealing material and swarf will impair the operational
reliability of the heat pump.
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Heating water flow
2 Heating water/DHW return
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Make the appropriate connections from the indoor
unit heating flow and heating return to the heating
system.
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Ensure that the connection is tight.
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When installing pipework, take care to prevent trans-
mission of vibration noise.
Quality of heating water
Use the correct fill water that is suitable for the components
of your heating system.
We recommend fill water prepared
according to Guideline VDI 2035-2.
A high pH value and low electrical conductivity in the fill
water will reduce to a minimum the risk of corrosion to iron
and copper materials, as long as there is also low oxygen
content.
This will also minimise scaling (calcification).
Fill water characteristics
pH value at 25°C
8.5-10
Electrical conductivity at 25°C
< 100 μS/cm
Oxygen content
< 0.05 mg/l
Chloride
< 30 mg/l
