18
PREHEAT-X Technical Guide
Alarms Screen
Refer to the following map when viewing the ALARMS Screens.
These screens will display automatically when alarms are present.
For alarm troubleshooting, see
pages 22-23
.
The alarms are as follows:
NO ALARMS:
This will be shown if there are no current alarms.
E-SHUTDN:
If 24VAC is removed from the Emergency Shutdown
Input, this alarm will activate and the controller will turn off all
outputs. The alarm will be disabled when voltage has returned.
LA1 SENS:
The first Leaving Air Temperature sensor has been
disconnected, shorted, open, or missing for more than 60 seconds.
This alarm will be disabled when the sensor is working again.
LA2 SENS:
The second Leaving Air Temperature sensor has been
disconnected, shorted, open, or missing for more than 60 seconds.
This alarm will be disabled when the sensor is working again.
LOW LAT:
This indicates a Leaving Air Temperature Cutoff
alarm condition which is activated if the Controlling Leaving Air
Temperature has dropped below 35ºF for more than 2 minutes.
The alarm will be disabled if after a fixed delay period the
Leaving Air Temperature has risen above 35ºF.
HI LAT:
This indicates a Leaving Air Temperature Cutoff alarm
condition which is activated if the Controlling Leaving Air
Temperature has risen above 120ºF. All outputs will stage off.
EA SENS:
The Entering Air Temperature sensor has been
disconnected, open, shorted, or missing for more than 60 seconds.
This alarm will be disabled when the sensor is working again.
COM STAT:
Communications have been lost with the main
controller for more than 30 seconds. This alarm will disable
when communications resume.
ALARMS
ALARMS
LCD SCREENS
Alarms Screen
