Orion System Two Condenser Head Pressure Module - Manual (Page 18)

Two Condenser Head Pressure Module
Technical Guide 18
Using LEDs to Verify Operation
The Two Condenser Head Pressure Module is equipped with LEDs
that can be used to verify operation and perform troubleshooting. There
are LEDs for communication, operation modes, diagnostic codes, and
relays. The Two Condenser Head Pressure Module has eight LEDs—
one for power, one for operation status, one for communication, one
for alarms, and four for compressor relays. See Figure 8 for the LED
locations. The LEDs associated with these inputs and outputs allow
you to see what is active without using a voltmeter.
 Status LEDs
“COMM” - This LED will light up to indicate Communications with
the VCM-X series controller. If Communications are established,
the COMM LED will blink. You should not see this LED light up in
stand-alone mode, because there would be no communications with the
VCM-X series controller.
“ALARM” - This is the diagnostic blink code LED. It will light up and
blink out diagnostic codes. See Table 8 below for Diagnostic Blink
Code descriptions. The blink code descriptions are also located on the
Module’s front cover.
No. of
Blinks
Status
0 No Problems
1 No Sensors Detected
2 High Head Pressure Detected
3 Low Head Pressure Detected
Table 8: ALARM LED Blink Codes
“STAT” - This is the status blink code LED. It will light up and fi rst
blink the address of the Module. It will then blink out the quantity of
sensors installed. See Table 9 below for Status Blink Code descriptions.
The blink code descriptions are also located on the Module’s front cover.
No. of
Blinks
Status
Random Blinks Quantity of Sensors
Installed
Table 9: STAT LED Blink Codes
Figure 8: LED Locations
Troubleshooting

 Module LEDs
“R1” - This LED will light up whenever Condenser A Enable Relay is
enabled and will stay lit as long as the relay is active.
“R2” - This LED will light up when the Heating Enable A is enabled
and will stay lit as long as the Heating Enable A is active.
“R3” - This LED will light up whenever Condenser B Enable Relay is
enabled and will stay lit as long as the relay is active.
“R4” - This LED will light up when the Heating Enable B is enabled
and will stay lit as long as the Heating Enable B is active.