4. CONTROLS
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4.6.2 Temperature control
Temperature level in the swimming pool hall equals the set point:
• The compressor will be stopped. If the compressor runs, the humidity control, or a
build in water cooled condenser has taken over.
• 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.
Temperature level in the pool hall is lower than the set point:
• The compressor will be running.
• The heating coil is running, if the compressor capacity is not large enough or the
compressor is not running (normally night time).
• 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.
IMPORTANT
If the compressor does not start, even if the temperature in the pool hall is below the set
point there can be the following reasons:
• The unit runs in night mode (Closed Pool High / Closed Pool Low or STOP)
• The outdoor / exhaust air damper setting (Min_Fresh_Air) is <10%.
Temperature level in the swimming pool hall is higher than the set point:
• The compressor will be stopped. If the compressor runs, the humidity control, or a
build in water cooled condenser has taken over.
• The heating coil will be stopped.
• The outdoor / exhaust air dampers will open more to get more cooled outdoor air to
the pool hall (overriding the set point Fresh air amount - Min_Fresh_Air). Secondly the
by-pass damper will slowly open to avoided heating the outdoor air in the heat
exchanger.
• The controller will give a digital signal to an optional cooling unit.
4.6.3 Evaporator de-icing
If the evaporator sensor (B26) is measuring a temperature <+5°C for more than 20 minutes
the compressor will be stopped and the outdoor / exhaust air dampers closed. At the same
time the fan speed goes up to full speed. When the evaporator has been de-iced, all
functions are going back to normal.
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