Now we will discuss some of the common systoms that you will see and the possible causes and solutions.
Symptom- Brownout Protection Mode. If the voltage is below 17 VAC, the Economizer Controller will go into this mode. This mode diables all of the relay outputs. When the power is 19 VAC or higher, the Economizer Controller will operate normally.
Symptom- An alarm is dispalyed on the LCD screen. Possible issue is sensor, damper, or the whole working system may not work properly. Check sensor, damper, or the whole system following the detailed alarm imformation per the manual.
Symptom- DAC LED is blinking RED. Possible issue is Damper slippage. Check whether the damper works properly.
Symptom- DAC LED is blinking RED very fast. Possible issue is that the damper is unplugged. Check whether the damper is connected.
Symptom- DAC LED is OFF. Issue is that there is no feedback signal to the controller. Check whether the feedback signal is connected.
Symptom- Sensor LED is solid RED. Possible issue is Mixed Air Sensor or Outside Air or Return Air Sensor configuration, must be either Type II NTC 10K or 0-10 vdc sensor.
Symptom- Sensor LED is YELLOW. Possible issue sensor connection, sensor type and signal.
Symptom- Sensor LED is OFF. Possible issue is CO2 sensor connection, sensor type and sensor signal type.
NOTICE:
If different fault events occur at the same time, Sensor/DAC LED lights up following the priority below:
RED (Fast Blinking) – RED (on, Steady) – RED (Blinking) -YELLOW-Off- Green. For example, if there is a humidity sensor error and air temperature failure at the same time, the Sensor LED turns red rather than yellow.
Also, after the controller enters the running state mode, it may take one minute for the peripheral devices to complete initialization. Before that, LED indication might be unstable.
