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XT-70 Control Panel 82
ROL_Start_Dly default setting = 10 minutes
Set the following Main Flash parameters:
OSA DIFF this parameter is used to adjust the Start Temp. A suggested value for
running ARL would be +5 degrees.
Purge_cnfg = 3
ARL / CO2: (Ambient Reverse Loading with a CO2 Sensor)
This configuration uses the same logic as the ARL purge_cnfg = 2. In addition to the ARL,
this configuration uses a CO2 sensor to trigger a purge and monitor the CO2 levels during the
ARL cycle. The ARL is active only during the Refrigeration cycle, but the CO2 purge can take
place either in Cooling or Refrigeration. For the CO2 purge to become active, the CO2 must
be greater than the CO2 SP. If the system is in Cooling and the Heat Switch is in Auto, then
the Return air heater will turn on and force the fresh air doors open to purge the system. The
heaters must be sized as to not raise the return air more than 3 degrees. The doors should
open somewhere between 20 to 30%.
If the system is running in Refrigeration, the CO2 purge will become active when the CO2
level is greater than the CO2 SP. When this happens the doors will slowly open and the Re-
frigeration will continue to maintain temperature. Once the CO2 level has dropped below the
Setpoint minus the CO2_Diff, the doors will slowly close.
To use this configuration, set the following E2 parameters:
Purge_Cnfg = 3
Ref_Level (ROL) default setting = 30 %
ROL_Diff default setting = 5 %
Low_Cutout default setting = 5 tenths of a degree
Max_Door default setting = 20 %
ROL_Start_Dly default setting = 10 minutes
CO2_Diff default setting = 200 ppm
CO2_RAS default setting = 5 tenths of a degree
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