Stulz CyberCool 2 - Page 27

27 © STULZ GmbH – all rights reserved EN/09.2019/G41
cybercool 2 screw original insTrUcTions
Chilled water quality
NOTICE
Observe the following limits for the water circuit of the chiller.
Water properties and ingredients
Carbonate hardness °dH <4
Carbonate hardness when adding inhibitors °dH <20
Total hardness °dH <15
pH value 7.0 - 9.0
pH value with light metal* 7.0 - 7.5
Chloride content mg/l <100
Chloride content with austenitic steels mg/l <50
Free chlorine mg/l <0.05
Hydrogen sulphide mg/l <0.05
Ammonia (NH
3
/NH
4
+
) mg/l <0.05
Sulphate mg/l <100
Manganese mg/l <0.05
Iron mg/l <0,2
Sulphide mg/l <0.05
Free aggressive carbonic acid mg/l <15
Suspended solids mg/l <20
Number of germs cfu/ml <1000
Electric conductivity without inhibitors µS/cm 10 - 500
Electric conductivity with inhibitors µS/cm <2200
cfu - colony forming units
*aluminium or titanium.
All data refer exclusively to the chiller.
NOTICE
• Check the water quality regularly.