Orion System Dual Digital Module - Manual (Page 12)

Dual Digital Module
Technical Guide 12
Using LEDs to Verify Operation
The Dual Digital Module is equipped with LEDs that can be used to
verify operation and perform troubleshooting. There are LEDs for com-
munication, operation modes, and diagnostic codes. The module has
seven LEDs—one used for power, one used for operation status, one
used for alarms, and four used for the compressor relays. See Figure
6 for the LED locations. The LEDs associated with these inputs and
outputs allow you to see what is active without using a voltmeter. The
LEDs and their uses are as follows:
 Status LEDs
“COMM” - The COMM LED lights up to indicate Communications
between the module and the VCM-X Modular series controller. If Com-
munications are established, the COMM LED will blink.
“ALARM” - This is the diagnostic blink code LED. It will light up
and blink out diagnostic codes. See Table 2 for Diagnostic Blink Code
descriptions. The blink code descriptions are also located on the mod-
ule’s front cover.
No. of Blinks Status
0 No Problems
1 Low Suction Pressure Compressor A1
3 Low Suction Pressure Compressor B1
5 Pressure Sensor A1 Not Detected
7 Pressure Sensor B1 Not Detected
9 No Communication
Table 2: ALARM LED Blink Codes
“STAT” - This is the status blink code LED. It will light up and every 10
seconds will blink the status mode that the module is currently operating
under. See Table 3 for Status Blink Code code descriptions. The blink
code descriptions are also located on the module’s front cover.
No. of Blinks Status
1 Off Mode
2 Cool Mode
3 Heat Mode
4 Dehumidify Mode
5 Defrost Mode
Table 3: STAT LED Blink Codes



Compressor LEDs
“R1” - This LED will light up when Compressor A1 is enabled and will
stay lit as long as Compressor A1 is active.
“R2” - This LED will light up when Compressor A2 is enabled and will
stay lit as long as Compressor A2 is active.
“R3” - This LED will light up when Compressor B1 is enabled and will
stay lit as long as Compressor B1 is active.
“R4” - This LED will light up when Compressor B2 is enabled and will
stay lit as long as Compressor B2 is active.
Figure 6: LED Locations
Troubleshooting