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XT-70 Control Panel 16
HMI Status Screen:
FAN: This is the current percentage of fan speed if variable frequency drives are used. This
value will change depending on the current system mode.
PLENUM T: The plenum temperature is measured using two plenum sensors located close together.
These two sensors are averaged and displayed as Plenum T. The reason for two
sensors is to detect a sensor failure. If the difference between the two sensors is above
a preset limit, the system will shutdown and display a plenum sensor alarm.
PLENUM H: Plenum Humidity. This value is used for the storage humidity control.
CO
2
: This is the CO
2
level in ppm. This reading is taken in the return air and is a good
indicator of the CO
2
level in the building. This reading is also used for the CO
2
control.
RETURN T: The return air temperature is located above the pile and is a good indicator of the
amount of heat coming out of the pile or of the average pile temperature.
START T: Start Temperature. Start temperature is a calculated value used to determine when out-
side cooling is available. For outside cooling air to be available, the outside air temp
must be below the start temperature.
REFRIG LEVEL: Refrigeration level is the current refrigeration operation level from 0 to 100 %.
DAILY: Actual run time since 12:00 Noon. The daily run time is cleared each day at noon.
TOTAL: Total run time of the system. At any time, press the TOTAL button to change the time to
zero or to a preset value.
This button will return to the previous screen.
This button will advance to the next screen.
This button will return to the main home screen.
The Locked button will keep the keyboard locked and will not allow any changes to the
setpoints. When the Locked key is pressed, a keyboard will appear. Type in the user-
name and password separated by a period.
Once the correct user name and password is entered, the key will change to
UnLocked. To lock the system again, press the UnLocked key.
This button will advance to the real time graphs module and the activity log.
<BWD
FWD>
<HOME>
Locked
UnLocked
GRAPHS
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