• For water-cooled units:
• The water inlet temperature of the energy recovery system.
• The water outlet temperature of the energy recovery system.
• The cooling water outlet temperature of the compressor.
Modifying settings
If the programmed warning settings for the water temperatures are exceeded, a warning indication is shown
on the compressor control module:
Temperature input Unit Minimum setting Nominal setting Maximum
setting
Water inlet of energy recovery ˚C 0 50 99
Water inlet of energy recovery ˚F 32 122 210
Delay at warning signal sec 0 Consult Atlas
Copco
255
Delay at start
(Should be less than delay at warning signal)
sec 0 Consult Atlas
Copco
255
Energy recovery water outlet ˚C 0 Depends on
application
99
Energy recovery water outlet ˚F 32 Depends on
application
210
Delay at signal sec 0 Consult Atlas
Copco
255
Delay at start sec 0 Consult Atlas
Copco
255
To modify a setting, consult section Modifying parameters
Recoverable energy
The recoverable energy can be calculated by using the following formula:
RECOVERED ENERGY (kW) = 4.2 x water flow (l/s) x water temperature rise (˚C)
In the tables below, typical examples are given, except for the recovered energy.
Consult Atlas Copco for specifications.
Data for low temperature rise/high water flow (at maximum speed)
Parameter Unit GA75 VSD GA90 VSD
Recoverable energy kW 56.3 67.5
Recoverable energy hp 75.5 90.5
Water flow l/min 53.6 64.3
Water flow cfm 1.89 2.27
Temperature at inlet ˚C 55 55
Temperature at inlet ˚F 131 131
Temperature at outlet ˚C 70 70
Temperature at outlet ˚F 158 158
Instruction book
68 2920 1634 04
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