Maximum heat capacity
available
ASD 25 ASD 30 ASD 40S ASD 40
[kcal/h] 14101 16578 20567 23732
Tab. 21 Heat capacity (option W1)
2.15.2 Option W2/W3
Internal heat recovery
Generally water is used as the heat transfer medium. The water must meet the specification given
below in order not to damage the heat exchanger.
➤ Consult authorized KAESER Service representative if you wish to use a different heat
transfer medium.
Water quality specification
Characteristics/content Value
pH value 7,5–9
Hardness [°dH] 4,0–8,5
Chloride (Cl) [mg/l] <150
Free chlorine gas (Cl
2
) [mg/l] <1
Sulphite (SO
3
) [mg/l] <1
Dissolved iron (Fe) [mg/l] <0,2
Hydrogen carbonat (HCO
3
) [mg/l] 70–300
Sulphate (SO
4
) [mg/l] <70
HCO
3
/SO
4
>1
Electrical conductivity [µS/cm] 10–500
Ammonia (NH
3
) [mg/l] <2
Dissolved manganese (Mn) [mg/l] <0,1
Dissolved aluminium (Al) [mg/l] <0,2
Dissolved nitrate (NO
3
) [mg/l] <100
Hydrogen sulphide (H
2
S) [mg/l] <0,05
Free aggressive carbon dioxide (CO
2
) [mg/l] <5
Glycol [%] <50
Solids (particle size) [mm] <0,1
Algae Not permitted
Tab. 22 Water quality specification
Heat exchanger specification
ASD 25 ASD 30 ASD 40S ASD 40
Material 1.4401 1.4401 1.4401 1.4401
Braze Copper (Cu) Copper (Cu) Copper (Cu) Copper (Cu)
2 Technical Data
2.15 Heat Recovery
9_5721 06 USE
Service Manual Screw Compressor
ASD T Tri-Voltage
11
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