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XT-70 Control Panel 9
XT Modes: The XT Panel operates in two modes: the main operation mode and a secondary mode. Depend-
ing on the setup of the alarms, it is possible to continue running in an alarm mode.
For example, for a cell pump failure, the secondary mode would indicate a cell pump failure, send out the alarm,
indicate an alarm (a blinking red light) but continue to run in Cooling or Refrigeration. Wetbulb calculation would
be shut off.
4.1 XT Modes of Operation
MAIN OPERATIONAL
MODES
SECONDARY
MODES
Main Operation Modes:
Shutdown: Shutdown is activated by the Stop/Start switch set to the Stop position.
Standby: Standby can only be activated with the time clock set to standby or
with no outside cooling available during Cooling mode.
Cooling: Cooling mode can only be activated with outside cooling air available
and time clock set to either Cooling or Refrigeration mode.
Refrig: Refrigeration mode will be activated when cooling air is not available
and the time clock is set for Run or Ref Only.
Timed: Timed Run will be activated when the time clock is set to Run, there
is no outside cooling air available and the refrigeration switch is set to
Off.
Remote Stop: Remote stop is activated with the Stop button from either the HMI
touchscreen or web interface.
Test: The Test mode is a special mode that allows remote testing of all out-
puts. This is activated from either the HMI or the web interface.
Low Temp: The low temp alarm is triggered by the backup low temp safety
thermostat. It can only be reset with the Start/Stop switch.
Air Restriction: The Air Restriction alarm is triggered by the air pressure differential
switch. It can only be reset with the Start/Stop switch.
Parameter Fail: The Parameter fail is triggered by an out-of-range setting on one of the
critical parameters. If setpoint is < 32.0 or > 76.7, the alarm is trig-
gered. If target is < 32.0 or > 76.7, the alarm is triggered. If pile diff
selection > 8, the alarm is triggered. If Start differential > 50 or < -50,
the alarm is triggered.
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