C0240111-04-05-GB
Winter (n° steps = 2)
P
out
T
in
proportional band
Figure 5.2
:
T
in
is the inlet variable, P
out
is the percentage of delivered power (winter).
ů
= Set + proportional band/2
Table 5.1 and 5.2
show some typical values for the parameters in question. The theoretical maximum and
minimum outlet temperature values refer to operation at nominal flow rates ( with a thermal head at the
evaporator of 5 °C and sufficient water in the system to ensure a litre / KW ratio equal to or greater than 11).
N°
steps
Setpoint
(°C)
Proportional band (°C)
Theoretical min.
outlet T
Theoretical max.
outlet T
2
9.5
2.5
5.7
10.8
4
7
5
5.7
8.3
Table 5.1
:
normally used setpoint and proportional band values according to the number of steps (summer).
N°
steps
Setpoint
(°C)
Proportional band (°C)
Theoretical min.
outlet T
Theoretical max.
outlet T
2
42.5
2.5
41.2
46.3
4
45
5
43.7
46.3
Table 5.2
:
normally used setpoint and proportional band values according to the number of steps (winter).
x
QUICK MIND ADJUSTMENT METHOD:
QUICK MIND adjustment is not available on chillers with recovery or freecooling or multi-purpose.
QUICK MIND adjustment is currently only possible on outlet water temperature.
Users only need set the required setpoint as the other parameters are adapted to the system by the
Quick Mind algorithm. The values normally used are:
Chiller SETPOINT
7 °C
Heat pump SETPOINT
45 °C
QUICK MIND is a self-adapting algorithm for adjusting the temperature of the water treated by a chiller.
Figure 5.3
shows how this adjustment is made:
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