Ochsner OLWI 9, Operating Instructions & Installation Instructions

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BA_OLW I OTE3_SW5x_EN_20160815_V2 10 / 48
6 Heating water connection
Appliance and environmental damage
The 3 electrical circuits for the appliance, the control
wiring and the electric emergency/auxiliary heater must
be protected separately.
►
Flush out the system pipework thoroughly before
connecting up the heat pump. Foreign bodies (e.g.
rust, sand or sealant material) influence the opera-
tional safety of the heat pump.
► Connect the heat pump to the heating system.
Make sure all connections are sealed.
► Connect the flexible pressure hoses to their con-
necting sleeves.
The pressure hoses must be at least 1 metre in length.
The low-vibration design of the heat pump and the
flexible hoses, which act as vibration dampeners, pre-
vent the transfer of vibration from the heat pump to the
pipework to a large extent.
6.1 Oxygen diffusion
Appliance and environmental damage
Avoid open heating systems or steel pipe installations
in connection with diffusion-sealed plastic-pipe under-
floor heating systems.
Diffusion-sealed plastic-pipe underfloor heating sys-
tems or open heating systems in conjunction with steel
pipework can lead to oxygen diffusion corrosion of the
steel pipework.
The products of such corrosion, such as rust silting,
can be deposited on the heat pump condenser and
lead to loss of performance or switching off due to the
restriction in the pipe cross section.
6.2 Second heat generator
In bivalent systems, the heat pump must always be
installed in the return from the external second heat
generator,
for instance an oil furnace.
6.3 Filling the heating system
6.3.1 Properties of the water
In order to prevent damage due to scaling, the hard-
ness of the water must be tested before filling the
heating system.
The total hardness of the water must be < 1 °dH (0.18
mmol/l alkaline earths).
► The water must be softened if this value is exceeded.
Filling with prepared water
to VDI 2035 / Ö Standard5195
Appliance and environmental damage
Desalinated water or rainwater must not be used as
this leads to increased corrosion. Suitable appliances
for softening as well as for filling and flushing the heat-
ing system can be obtained in specialist shops.
6.3.2 Filling
1 Emptying
Fig.9: Filling the heating system
►
Filling the heating system via the drain valve.
►
After filling the heating system, check the
connections for seal (visual inspection and feel).