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XT-70 Control Panel 67
RTN H > HSP If the return humidity is less than the humidity setpoint then the system will continue in the cool-
ing mode. Once the return humidity is greater than the humidity setpoint then the outside air will be check to
see if it is cold enough. In order to dehumidify the outside air must be cool enough that it can be warmed up to
dehumidify.
OSA < SP - De_diff The system will check and see if the outside air is less than the setpoint minus the dehu-
midify differential. A typical setting for the dehumidify differential would be 5 degrees. When the outside air is
cool enough then the system will go into dehumid mode. In the dehumid mode the burner will fire on a low set-
ting. The fresh air doors will continue where they were to control plenum temperature to setpoint. The low
bruner firing rate will cause the doors to open and bring more fresh dry air in. If the outside air is to warm then
the system will go back to the cooling mode.
RTH H => HSP The system will terminate the dehumid mode when the return humidity drops below the
humidity setpoint.
See Onion Flow Chart on the following pages:
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