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6 Assembly
6.1 General
The following connections need to be established on the heat
pump:
Flow and return of the heating system
Control lines to the heat pump manager
Voltage supply
Condensate drain
All panelling can be removed to allow accessing the inside of the
device.
Loosen the screws for this purpose. The panels can be removed
toward the top when slightly tilted.
6.2 Connection on the heating side
The heating system connections on the heat pump are to be
made inside the device. Refer to the device information for the
connection sizes. Route the connection hoses out of the device
in a downwards direction. An optional pipe kit is available as an
accessory, which can be used to lead the connections out to the
side. Use a spanner to firmly grip the transitions when connecting
the heat pump.
Before connecting the heating water system to the heat pump,
the heating system must be flushed to remove any impurities,
residue from sealants, etc. Any accumulation of deposits in the
liquefier could cause the heat pump to completely break down.
Once the heat pump has been connected to the heating system,
it must be filled, de-aerated and pressure-tested.
Consideration must be given to the following when filling the sys-
tem:
Untreated filling water and make-up water must be of drink-
ing water quality
(colourless, clear, free from sediments)
Filling water and make-up water must be pre-filtered (pore
size max. 5 µm).
Scale formation in domestic hot water heating systems cannot be
avoided, but in systems with flow temperatures below 60 °C, the
problem can be disregarded. With high-temperature heat pumps
and in particular with bivalent systems in the higher performance
range (heat pump + boiler combination), flow temperatures of
60 °C and more can be achieved. The following standard values
should therefore be adhered to with regard to the filling and
make-up water according to VDI 2035, sheet 1: The total hard-
ness values can be found in the table.
Fig. 6.1:Guideline values for filling and make-up water in accordance with
VDI 2035
For systems with an above-average specific system volume of
50 l/kW, VDI 2035 recommends using fully demineralized water
and a pH stabiliser to minimize the risk of corrosion in the heat
pump and the heating system.
ATTENTION!
With fully demineralized water, it is important to ensure that the minimum
permissible pH value of 7.5 (minimum permissible value for copper) is
complied with. Failure to comply with this value can result in the heat
pump being destroyed.
Opening the cover panels
Closing the cover panels
3LSHNLW
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Total heat
output in kW
Total alkaline
earths in mol/m³
and/or mmol/l
Specific system volume
(VDI 2035) in l/kW
< 20
≥
20 < 50
≥
50
Total hardness in °dH
< 50
≤
2,0
≤
16,8
≤
11,2
< 0,11
50 - 200
≤
2,0
≤
11,2
≤
8,4
200 - 600
≤
1,5
≤
8,4
< 0,11
> 600
< 0,02
< 0,11
1
1. This value lies outside the permissible value for heat exchangers in heat
pumps.
