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XT-70 Control Panel 84
that will bring in fresh air. This configuration operates with a CO2 sensor. This purge will
work in either a Time or Refrigeration mode. The Aux 1 switch must be configured to control
the ventilator and be set to Auto. If the CO2 level is greater than the CO2 SP, then the venti-
lator will be turned on. The ventilator will turn off when the CO2 level is below the CO2 SP -
CO2 Diff.
To use this configuration, set the following E2 parameters:
Purge_Cnfg = 5
Aux 1_Config = 1
CO2_Diff default setting = 200 ppm
Set the following Main Flash parameters:
CO2 SP this is the CO2 Setpoint. A suggested value would be 2000 ppm.
Purge_cnfg = 6
Timed / CO2 Purge: This parameter is used when you do not have refrigeration but desire to
recirculate the air when there is no cooling air available. A CO2 sensor is required and will be
used to trigger the purge cycle. If you are in Cooling mode and the CO2 level is greater than
the CO2 SP, the purge cycle will be activated. The Heat switch must be in Auto and the Re-
turn air heaters will then be turned on. 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 Timed Run mode, then the purge will be triggered by both time and
CO2.
Example: (Buttons are main flash parameter that need to be set)
If outside air is less than 40 degrees, initiate a purge cycle for 15 minutes every 6 hours and
run the fans at 85%. If the XT panel is in cooling, the return air heaters will be turned on for
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