Ochsner TERRA 6, Operating And Installation Manual

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INSTALLATION | Appliance installation
982001-TERRA-M2-M4-EN04.1 | www.ochsner.com 23
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1 2
1 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.
»
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
Material damage
Unsuitable fill water can damage your system due
to scaling and corrosion.
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If necessary, ensure that the fill water is pro -
fessionally softened and demineralised.
10.2.2 Safety valve drain
i
Information
The indoor unit has an internal safety valve for the
heat sink system (DHW, heating water).
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Observe national and regional regulations re-
garding the design of the drain and prescribed
regular operational tests.
i Information
The maximum operating pressure of the heat
transfer medium is 3 bar. However, due to closing
pressure differences, the safety valve may begin
to open from a pressure of 2.4 bar.
If the valve is triggered, the liquid exits via a hose on the
rear of the indoor unit.
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The safety valve drain should be sized so that the
liquid can drain unobstructed via an open and readily
visible waste water drain.
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Install the hose with a consistent fall to the drain.
Avoid kinking the hose.
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10.2.3 Filling the heating system
On delivery, the 3-way switching module will be in the
“heating mode” position.
You can find information on subsequent manual switching
of the 3-way switching module in the controller operating
instructions (DHW circuit/relay test).
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Fill the heating system with suitable fill water using
the drain and fill valve.