BTU XT-70 - Page 10

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XT-70 Control Panel 10
Comm Fail: Loss of communication between the Rabbit and P1 processor for more
than three minutes. An internal comms bus failure is serious.
Power Fail: Loss of 110VAC control power.
Remote Standby: Remote Standby is activated by a contact closure across input IN4.
Typically used for off-peak power, ripple control or refrig defrost.
Alarm Standby: Any alarm condition that was set to shut down the system.
Cure: This mode is a Onion mode. This mode is used when the fresh air
doors are being used to cure the onions.
Burner: This mode is a Onion mode. This mode is used when the burner is
being used to cure the onions.
Fan Fail: The fan input IN1 did not get a closed contact within the fan fail timer
period. There is a programmable timer associated with this alarm.
Fan Off: The fan MOA switch is in the Off position.
Warming: The virtual warming switch in in the Auto position. In Warming mode,
the doors will open whenever the OSA is greater than the start tem-
perature and will warm the plenum air up to the setpoint. The PID is
running in a reverse mode, opening the doors whenever the plenum is
too cold. When OSA is less than the start temperature the system will
run in Cooling. The time clock must be set to Cooling for the Warming
mode to operate.
Cooling / Purge: The system is in Cooling and the return air heaters are being used to
force the fresh air doors open. This cycle has been triggered by time
and not the CO2 sensor.
Refrig / Purge: The system is in Refrigeration and the fresh air doors are open to the
max door setting. This cycle has been triggered by time and not the
CO2 sensor.
Timed / Purge: The system is in Timed and the time purge cycle is active. At the
designated time, the fresh air door will open to the max door setting
and purge for the programmed time. This cycle has been triggered by
time and not the CO2 sensor.
Refrig / ARL: The system is in Refrigeration and the ARL (ambient reverse loading) is
active. The Fresh air doors are being used to bring in fresh air and keep
the refrigeration running at a minimum setting.
Cooling / CO2: The system is in Cooling and the CO
2
level is above The CO2 setpoint.
The return air heaters are active to help open the doors and purge the
CO
2
.