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DEHUMIDIFICATION
8
8.1 Dehumidification start-up
Activating dehumidification happens through an On/Off logic according to the step reported in the following diagram.
The dehumidify setting parameter is under the "Set point" menu.
The dehumidify differential parameter is under the "Regulations" menu, which can be accessed by entering the "Service"
password.
For the default values, see the parameters table.
The actions following the step activation are enabled:
1.
after regulation consent;
2.
If the room humidity probe is present;
3.
If the dehumidify regulation is enabled;
4.
if there is no room humidity probe alarm.
The step only activates when at least 6 minutes have expired from the previous activation.
The s-MEXT unit will forward the dehumidification request 0/1, which will then be converted into maximum cooling capacity
request for the PAC-IF board, and sent to the same in accordance with the time scales indicated in the "x-MEXT unit Cooling"
subsection.
The ventilation will switch to the percentage dictated by parameter P23.10.
8.2 Dehumidification limits
8.2.1
General considerations
When the dehumidification function is enabled, the reaction of the ambient temperature depends on the heat load present at
that moment:
•
If the heat load is such as to require maximum cooling power, the decrease in sensible power caused by the activation
of the dehumidification function may not allow the present thermal load to be addressed. Therefore, the risk is that the
ambient temperature rises excessively.
•
If the thermal load does not require cooling resources, activation of dehumidification lowers the temperature below the
setpoint.
To avoid losing control of the temperature in these two cases, upper and lower limits must be set, beyond which the
dehumidification function is disabled.
Version 38
Dehumidify
P50.03
P20.20 Differential
Figure 8-1: dehumidification start-up graph.
HR
(%)
ambient
146
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