Dantherm DanX 1 - 4.7 Control Description DanX 1;2;3 XD

4. CONTROLS
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4.6.4 Fan control
Normally the fans are running at the speed set in the Time Program, but if the speed is set to
low speed (Open Pool Low or Closed Pool Low) there can be the following reasons, why the
unit is running still on full speed.
• If the calculated dehumidification demand is >50%, which means there is a larger
difference between the actual humidity and the set point, the fans will go to full speed,
until the calculated dehumidification is again <50%.
• If there is a demand for free cooling (Outdoor_Air_Temp < Room_Temperature) the
fans will go over to full speed until the set point temperature has been reached again.
• If there is a larger difference between the actual hall temperature and the set point
than 2°C the fans will go to high speed, until the difference is lower than 2°C.
• If the supply air temperature is above the set point (Max_Supply_Temp).
• If the evaporator is been de-iced. The de-icing stops when the evaporator temperature
(Evap_Temperatur) is >+2°C.
4.7 Control description DanX 1/2/3 XD
The control strategy for a swimming pool unit is quite complex, therefore this user manual
will only descript the basic functions of the control system. In generally the humidity control
has always the highest preference, before the temperature control.
4.7.1 Humidity control
Humidity level in the pool hall is lower or equals the set point:
• The outdoor / exhaust air dampers are partly open in day time (Set point Fresh air
amount - Min_Fresh_Air) and will be closed in night time.
Humidity level in the swimming pool hall is higher than the set point:
• The outdoor / exhaust air dampers will open more to get more dry outdoor air to the
pool hall (overriding the set point Fresh air amount - Min_Fresh_Air).
If in summertime the outdoor air temperature is higher than 23°C, condense in the pool hall
is no longer an issue. Therefore the humidity set point will be moved upwards with 1% for
each °C above 23°C outside, but maximum by 5%. This means with a set point of 55% R.H.
the maximum possible relative humidity is 60% at an outdoor temperature of 28°C.
4.7.2 Temperature control
Temperature level in the swimming pool hall equals the set point:
• The heating coil will be stopped.
• The outdoor / exhaust air dampers are partly open in day time (Set point Fresh air
amount - Min_Fresh_Air) and will be closed in night time.