For energy recovery systems, the limit is 100 ppm.
7.
Sulphates (SO
4
2-
)
Sulphate (ppm)
Type of cooling system Standard Energy recovery
Single pass < 1000 < 200
Recirculating (with tower) < 1000 not applicable
Closed loop < 400 < 200
8. Iron and Manganese
Dissolved iron (ppm) Dissolved manganese (ppm)
Type of cooling
system
Standard Energy recovery Standard Energy recovery
Single pass < 1 < 0.2 < 0.2 < 0.05
Recirculating (with
tower)
< 1 not applicable < 0.2 not applicable
Closed loop < 1 < 0.2 < 0.2 < 0.05
The values in bold are rejection limits.
9. Copper
Copper (ppm)
Type of cooling system Standard Energy recovery
Single pass < 1 < 0.2
Recirculating (with tower) < 1 not applicable
Closed loop < 1 < 0.2
10. Ammonium
The limit of 0.5 ppm is a rejection limit.
The limitation only applies for copper containing systems.
11. Suspended solids
Large particles (size > 10 µm) should not be present as they can be filtered out.
Small particles (< 0.5 µm) are not taken into account.
For particles between 0.5 µm and 10 µm, the following limits apply:
Suspended solids (ppm)
Type of cooling system Standard Energy recovery
Single pass < 10 < 1
Recirculating (with tower) < 10 not applicable
Closed loop < 10 < 1
12. Oil or grease
< 1 ppm (rejection value)
13. Biology
If biology is present, it must be aerobic. Anaerobic biology (in closed systems) must be
avoided.
Instruction book
90 2920 7118 31
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