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XT-70 Control Panel 104
The purge config after the cure cycle will depend on if there is refrigeration, heat and a CO2
sensor.
Without a CO2 sensor, purge config 1 is the only choice. It is triggered by elapsed time and
must have heat to purge when in the cooling mode. See previous page for explanation of
purge config 1.
With a CO2 sensor and no refrigeration, purge config 7 would work best. This purge will work
with or without heat. See previous page for explanation of purge config 7.
With a CO2 sensor and refrigeration, purge config 3 is the best purge cycle. Purge config 3
needs some additional setup. For sweet potatoe, we do not want to use ARL (ambient re-
verse loading).
In this configuration, the system will only purge if the CO2 rises above the CO2 Setpoint. In
Cooling mode, the return air heater will be turned on, raising the return temperature by 3 or 4
degrees. This will cause the fresh air doors to open and purge the CO2. This should only
happen during cold temperatures when the doors are just barely open. In refrigeration, when
the CO2 exceeds the setpoint the fresh air doors will gradually open up to the max doors set-
ting. As soon as the CO2 drops below the CO2 Setpoint minus the CO2 Diff, the doors will
gradually go closed.
These are the parame-
ters that should be set.
The values shown are
the suggested values.
For more information
on each of these val-
ues, see the operators
manual.
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