C0240111-04-05-GB
n. step
Dynamic
Setpoint
Dynamic freecooling band
T. in
Step speed adjustment
Chiller
Setpoint
%
demand
Figure 6.3c
:
fan adjustment in the step mode (example with 8 fans)
100%
%
demand
Continuous speed adjustment
T. in
Chiller
setpoint
Dynamic freecooling band
Dynamic
setpoint
Figure 6.3d
:
fan adjustment in the continuous mode
6.2) CONDENSATION
Condensation adjustment depends on how the fans are turned on.
Various condensation adjustment types in the “chiller” operating mode are shown below.
The fans may be turned on using the on/off system ( “step”) in which the fans are turned on
progressively one after the other (figure 6.4a) or mutually excluded (figure 6.4b). Fans switched on in
parallel but that increase fan speed (depending on pressure) are illustrated in figure 6.4c).
Pressure
Set Point
Set Point -
differential
Set Point
Set Point -
differential
Set Point
Set Point -
differential
Active
steps
1
2
3
Step1 on
Step2 on
Step3 on
Continuous step adjustment
Set Point
Set Point -
differential
Step4 on
Figure 6.4a:
“continuous step” condensation adjustment
36