System Congurations
Mechanical Cooling Mode
When the ambient temperature is above the set point of the cabin space, the fresh air damper switches into the vertical
position and cycles the cabin air through the unit and evaporator coil. The mechanical circuit is switched on providing
100% mechanical cooling.
Condenser Fan On
Compressor(s) On
Heating Elements Off
Evaporator Fans On
Cabin Return Air
Cabin Supply Air
Free Cooling Mode
When the ambient temperature is low enough to provide full free cooling duty, the fridge circuit is switched off and the
damper is positioned horizontally.
The EC evaporator fan speed modulates based upon the difference between the ambient temperature and the cabin set
point.
This allows the unit to draw the correct volume of ambient air into the cabin space, pressurising the cabin and
exhausting air through the extract louvre.
In the event of a power cut, the damper actuator spring returns into the free cooling position to allow fresh air to drift into
the cabin space, or with the DC backup unit the DC evaporator fans provide a controlled air ow in to the cabin until the
battery supply is used up, the power returns, or an engineer arrives on site.
Condenser Fan Off
Compressor(s) Off
Heating Elements Off
Evaporator Fans On
Cabin Return Air
Cabin Supply Air
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