Atlas Copco GA 45+ - Page 115

Modifying settings
If the programmed warning settings for the water temperatures are exceeded, a warning
indication is shown on the controller:
Temperature input Minimum
setting
Nominal
setting
Maximum
setting
Water inlet temperature of energy recovery ˚C 0 50 99
Water inlet temperature of energy recovery ˚F 32 122 210
Energy recovery water outlet temperature ˚C 0 Depends on
application
99
Energy recovery water outlet temperature ˚F 32 Depends on
application
210
To modify a setting, consult the relevant section in the description of the controller.
Recoverable energy
The recoverable energy can be calculated from:
RECOVERED ENERGY (kW) = 4.2 x water flow (l/s) x water temperature rise (˚C)
In the tables below, typical examples are given.
Data for low temperature rise/low water flow systems
Parameter Unit
GA 30
+
GA 37
GA 37
+
GA 45
GA 45
+
Recoverable energy kW 27.5 32.5 32.5 39.5 41.2
Recoverable energy hp 36.8 43.5 43.5 53 55.2
Water flow l/min 39.4 46.6 46.6 56.6 59
Water flow cfm 1.4 1.6 1.6 2 2.1
Temperature at inlet ˚C 50 50 50 50 50
Temperature at inlet ˚F 122 122 122 122 122
Temperature at outlet ˚C 60 60 60 60 60
Temperature at outlet ˚F 140 140 140 140 140
Data for high temperature rise/low water flow systems
Parameter Unit
GA 30
+
GA37
GA 37
+
GA 45
GA 45
+
Recoverable energy kW 27.5 32.5 32.5 39.5 41.2
Recoverable energy hp 36.8 43.5 43.5 53 55
Water flow l/min 5.5 6.5 6.5 7.9 8.2
Water flow cfm 0.19 0.23 0.23 0.28 0.29
Temperature at inlet ˚C 20 20 20 20 20
Temperature at inlet ˚F 68 68 68 68 68
Temperature at outlet ˚C 92 92 92 92 92
Temperature at outlet ˚F 197 197 197 197 197
Instruction book
2920 7109 51 113