MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
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EN1Z-1076GE51 R0722
Controller LED Status
Table 12. Controller LED Status
Mode
LED Status
Visual
Firmware download
Green blinks every 200 ms.
No application
a)
Red, Green, Yellow blinks every 1 s.
Broken sensor
Red permanent ON
b)
.
Short circuit
AutoMac
Green blinks every 2 s.
No Valid Mac
Yellow permanent ON.
Un Ack Alarm
Yellow blinks every 2 s.
Normal operation
Green LED permanent ON.
Communication error
Red LED blinks every 200 ms.
a)
While performing setpoint balancing using the VAV mobile application, the LED pattern changes from static green to red, green, yellow
cycles (which indicates the controller is empty).
b) For troubleshooting a permanent red LED, navigate to IRM Program > On Board IO and check the UIO function block OutCase status.
A permanent red LED will be illuminated when the OutCase status is SensorOpen (broken sensor) or SensorClose (short circuit).