0906-E
15
Water Outlet Temperature
Change Rate
+ 2°C
THERMOSTAT - Control principle
Function
Adjust and hold the fluid outlet temperature as close as possible to the set point, by controlling the number of
compressor stages depending on the thermal load on the system.
Description
CLIMATIC
TM
50 control constantly calculates the required capacity to reach the temperature set point.
This variable is called “CAPACITY FACTOR” (CF) and its value can vary from 0 to 100%.
It is directly linked to the number of control stages of the unit.
i.e.: For ecologic WA 230D K STD with 6 control steps, the CF will start and stop a step at the following
values:0-17-33-50-67-83-100
It then evolves following the principles detailed in the diagram below (This applies to a chiller):
In any Cases, for a chiller, if the Low Water temperature limit is reached, Compressors are stopped.
In order to anticipate, the reference point is recalculated each time the difference between water temperature
and set point reach a minimum or a maximum.
The rate of change of the Capacity Factor (CF) is determined by another parameter called “REACTIVTY”
and which value is in:
% of CF / °C (Diff vs Set point) / min
REACTIVITY for Cooling Mode can be adjusted in menu 3325
REACTIVITY for Heating Mode can be adjusted in menu 3335
SLOW FAST
FAST SLOW
0°K
+ 2°K
- 1°K
- 2°K
Zone
CF FROZEN
CF INCREASES
(Start more
Capacity Stages)
CF FROZEN
CF DECREASES
(Removes
Capacity Stages)
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