Lennox VEP034N432US - Page 33

DC Inverter Multi VRF System
29
Description of each stage of debugging progress
——
Debugging code
Progress code
Status code
Code meaning and operation
method
Progress
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
db On 10 On U6 On
Outdoor valves are not fully turned
on. Press main board’s SW6 button
and display shows “db 09 OC”. Then
check if the gas and liquid valves of
ODU are completely open. After
confirmation, press the SW6 button
again. Then compressor will start
running for about 2min to inspect the
status of valves.
db On 10 On OC On
Valves status is normal. Unit will
display as in the left for 2s and then
start next step.
12_ Confirm
debugging
startup
db On 12 On AP Blink
Ready for units to start debugging.
Press main board’s SW7 button to
confirm startup of debugging. 2s
later, main board will display as
below.
db On 12 On AE On
Startup is confirmed. After displaying
for 2s, system will choose
“15_Cooling debugging” or
“16_Heating debugging” according
to ambient temperature. If the
project requests to add refrigerant
but it is not complemented before
debugging, then refrigerant can be
added in this process through the
L-VALVE.
15_ Cooling
debugging
db On 15 On AC On
Debugging for cooling mode. If no
malfunction occurs for 20min when
compressor is running, then system
will start progress 17.
db On 15 On
Error
code
On
Malfunction occurs when debugging
for cooling mode. After all
malfunctions are eliminated, system
will start next step.
16_ Heating
debugging
db On 16 On AH On
Debugging for heating mode. If no
malfunction occurs for 20min when
compressor is running, then system
will start progress 17.
db On 16 On
Error
code
On
Malfunction occurs when debugging
for heating mode. After all
malfunctions are eliminated, system
will start next step.
17_ Debugging
finished
00 On AC/AH On OF On
The entire unit has finished
debugging and under standby-by
condition.