Lennox VEP Series, Installation & Operation Instructions

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Step 8: in step 04, the quantity of IDUs needs to be confirmed manually. Main board of
each module will display:
Cycle code Progress code Status code
Progress
LED1 LED2 LED3
Code
Display
status
Code
Display
status
Code
Display
status
04_Confirm the
quantity of IDUs
db Light 04 Light
Quantity of
connected
IDUs
blink
If the quantity displayed is the same with actual quantity, then press SW7
confirmation button on the master unit to confirm it. Unit will start next step :
Cycle code Progress code Status code
Progress
LED1 LED2 LED3
Code
Display
status
Code
Display
status
Code
Display
status
04_Confirm the
quantity of IDUs
db Light 04 Light OC Light
Step 9: step 05 is “ Check ODU internal communication”
If no error is detected, system will display as below and then start next step .
——
Cycle
code
Progress code Status code
Meaning
progress
LED1 LED2 LED3
Code Display
status code
Display
status Code
Display
status
05_ Check
ODU internal
communication
db Light 05 Light OC Light Detection is finished.
Start next step .
If error is detected, system will stay at current progress. Error has to be solved manually.
Below are relevant errors:
——
Cycle
code
Progress code Status code
Meaning
progress
LED1 LED2 LED3
Code Display
status code
Display
status Code
Display
status
05_ Check
ODU internal
communication
db Light 05 Light C2 Light
System detects “driven communication
error between master unit and inverter
compressor”.
db Light 05 Light C3 Light
System detects “driven communication
error between master unit and inverter
fan”.
db Light 05 Light CH Light IDU/ODU “
diversity exceed 135%"
db Light 05 Light CL Light IDU/ODU “
diversity lower than 50%"
Elimination methods of above errors can be found in Troubleshooting.
Step 10:
step 06 is “Detect outdoor components”
If no error is detected, system will display as below and then start next step .
Lennox VRF Unit