Note
These media have an impact on valve selection (material of O-rings, gaskets, plug/seat, and valve body). Compatibility must be checked.
Deionized water |
Demineralized water |
Super-clean water |
|---|---|---|
The ions of salts contained in the water have been removed |
The minerals contained in the water have been removed |
Intensely treated water with a high specific resistance and containing no organic substances |
To avoid corrosion and to ensure a long service life of the valves, gaskets and plugs, the following limits must be observed:
Oxygen: < 0.02 mg/l
pH value: 8.2…8.5
Electric conductance: < 5 μSi
Sum of alkaline earths: < 0.0051 mmol/l
Hardness: < 0.03 °dH
Planning
The media must be approved by the supplier for use in HVAC plants
Install a strainer (dirt trap)
Installation and commissioning
The company making the installation is responsible for the quality of the media used
Before filling a hydraulic HVAC circuit with a medium, the installer must observe the supplier’s specification. If such specifications or regulations are not observed, severe damage to the plant can occur
When commissioning a plant, the company that made the installation is obliged to write a commissioning report including information about medium quality and filling (plant volume) and, if necessary, about water treatment and additives used
Recommendation
Keep a plant record.
Maintenance, service
The installer should check hydraulic HVAC circuits at least once a year.
Recommendation
The quality of the medium used in open or closed HVAC plants must be checked at regular intervals. The plant record must always be kept up to date.