Concurrent Mode
When the ambient temperature is below the set point of the cabin space, but not low enough to provide full free cooling
duty, the unit can cycle the compressor on and off to cool the ambient fresh air and provide the required cooling duty,
whilst saving energy by the unit not being in full mechanical cooling mode.
Condenser Fan On
Compressor(s) On
Heating Elements Off
Evaporator Fans On
Cabin Return Air
Cabin Supply Air
Heating Mode
In low ambient conditions the space within the cabin may drop below a lower threshold if the internal equipment is not
rejecting enough heat and the heat loss of the cabin is not sufcient to sustain a suitable operating environment.
At this point the unit damper is positioned in the vertical position, the cabin air is cycled through the unit and the electric
heat is turned on, heating the return air and supplying it to the cabin space.
This will be provided until an appropriate temperature is seen in the return duct.
Condenser Fan Off
Compressor(s) Off
Heating Elements On
Evaporator Fans On
Cabin Return Air
Cabin Supply Air
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