CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E
17
THERMOSTAT / HYGROSTAT – Control principle
Function
Adjust and hold the room air temperature or humidity as close as possible to the set point, by controlling the number of
compressor stages depending on the thermal load of the system.
Description
CLIMATICTM50 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.
Thus for a unit with 4 stages of regulation, the CF will start and stop a stage with the following values:
0-25-50-75-100.
It then evolves following the principles detailed in the diagram below (case of a cooler):
In order to anticipate, the reference point is recalculated each time the difference between air 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
3361 ! REACTIVITY for the cooling mode.
3362 ! REACTIVITY for the heating mode.
3363 ! REACTIVITY for the fresh air reheating mode
For the option of control humidity
3364 ! REACTIVITY for the dehumidification mode.
3365 ! REACTIVITY for the humidification mode.
Permutation, Cold or Heat Mode (Change-Over ; optional)
The choice of the operating mode in cooling or heating is automatically carried out according to the room temperature
and the temperature set points adjustment.
Meanwhile as an option, using free contacts on parametric inputs, it is possible to disable one mode or another. (see
Customized Input / Output (BE.50))
• With a free contact on [Sw Dis.Cool] The contact closing will disable the cooling mode.
• With a free contact on [Sw Dis.Heat] The contact closing will disable the heating mode.
Difference between
the Room
Temperature and the
set point
Room Temperature
Change rate
0°K
+ 2°K
- 1°
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