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MODULE IV |
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Graphic: Experimental/test
setup

English translation of technical terms and sentences of the diagram above:
| Brennstoffgruppe | = | Fuel group |
| Gasgemisch | = | Gas mixture |
| Thermostat oder Einhandhebelmischer für eingangsseitige Temperaturwahl | = | Thermostat or lever mixer for the input temperature selection |
| Warmwasser | = | Hot water |
| Kaltwasser | = | Cold water |
| Temperatur-Messstellen | = | Temperature measuring points |
| Durchflussmengenmesser | = | Flow meter |
| Druckminderer | = | Pressure reducer |
| Kugelventil | = | Ball valve |
| Abfluss | = | Drainage |
| Kondensatablauf | = | Condensate drain |
| Abgasaustritt | = | Exhaust gas outlet |
| Verbrennungsluftbedarf | = | Combustion air requirement |
| Brennwert Ho | = | Calorific value Ho |
| Heizwert Hu | = | Heating value Hu |