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Premium Commercial Controls
ERV
78
TROUBLESHOOTING
Alarm Number 15 and 20:
CO2 or VOC Level Alarm
This alarm occurs when the CO2 or VOC sensor is enabled, and the CO2 or VOC level rises
above the level set in this screen for more that the delay time.
First make sure the pressure sensor is reading correctly in the
Unit Status
. If the sensor is
not reading correctly, check the range settings in
I/O Configuration
, the wiring, and the
calibration screen.
If the sensor is reading correctly, the CO2/VOC level is too high. You may have to adjust the fan
control to keep it within limits.
Alarm Numbers 16 and 17:
Low SA Temp Warning and Low SA Temp Shutdown
In units without heating, the alarm applies to the supply temperature (SA). In units with heating,
this alarm applies to the unit supply temperature that is measured after the heating unit.
First, view the sensor value in
Unit Status
. If it seems OK, then check the alarm levels set
here. (Only one will show, depending upon whether you have a Unit Supply Temp Sensor). The
difference in the two is that the warning will just show as an alarm while the shutdown will shut
down the unit. You can use the warning as a warning set at higher temperature for the purposes
of warning. You can also just use one or the other by setting the limits of the one you do not
want to use very low.
Alarm Numbers 18 and 19:
High SA Temp Warning and High SA Temp Shutdown
This alarm only applies to units with cooling and applies to the CA Temperature.
First, view the sensor value in
Unit Status
. If it seems OK, then check the alarm levels set here.
The difference in the two is that the warning will just show as an alarm while the shutdown
will shut down the unit. You can use the warning as a warning set at lower temperature for the
purposes of warning. You can also just use one or the other by setting the limits of the one you
do not want to use very high.
