Lennox VEP034N432US User Manual page 35

DC Inverter Multi VRF System
——
Progress
07/XX/error
07_ Detect indoor
components
07/XXXX/err
08_ Confirm
preheated
compressor
09_ Refrigerant
judgments before
startup
10_ Status
judgments of
outdoor valves
before startup
12_ Confirm
debugging startup
Description of each stage of debugging progress
Debugging code
LED
Code Display status
Display
code circularly
Display
or code circularly
Display
07/oC
circularly
Display
08/U0
circularly
Display
08/oC
circularly
Display
09/U4
circularly
Display
09/oC
circularly
Display
10/on
circularly
Display
10/U6
circularly
Display
10/oC
circularly
Display
12/AP
circularly
Display
12/AE
circularly
Code meaning and operation method
System detects error on indoor components. XX means the
project code of IDU with error, e.g. no.1 IDU has d5 and d6
errors, meanwhile no.3 IDU displays error d6 and d7, then
the nixie tube will display "07", "01", "d5", "d6"and "03"
circularly. After errors are eliminated, system will start next
step automatically. If power is off during troubleshooting, then
restart debugging from progress 01 after power is on.
If errors occur in IDU which the project code is ≥ 3-digit
number, then it will display the 2 big digits of project code first,
then the 2 small digits, finally the error code, e.g.: L1 error
occurs in no.101 IDU, then the nixie tube will display "01","01"
and "L1" circularly. Display method is the same for several
IDUs with multiple errors.
No error on components of IDU. 5s later, next step starts.
Preheat time for compressor is less than 8 hours. Display will
be as in the left until the preheat time reaches 8 hours. Press
main board's SW3 button to confirm manually that the
preheat time has reached 8 hours. Then start next step
(Note: Compressor may get damaged if it is started without 8
hours of preheat time).
Compressor has been preheated for 8 hours. 2s later, next
step starts.
System is lack of refrigerant and display will be as in the left.
Please cut off power of IDU and ODU and check if there is
leakage on pipeline. Solve the leakage problem and
complement refrigerant into the unit. Then connect power
and restart debugging from progress 01 (Note: Before
re-charging refrigerant, unit must be power off in case system
starts progress 10 automatically).
Refrigerant is normal and unit will display as in the left for
2s.Then next step starts.
Valves of ODU are being inspected. Compressor will start
operation for 2min or so and then stop. The opening and
closing status of outdoor valves are as below.
Outdoor valves are not fully turned on. Press main board's
SW4 button and display shows "09/OC". Then check if the
gas and liquid valves of ODU are completely open. After
confirmation, press the SW4 button again. Then compressor
will start running for about 2min to inspect the status of
valves.
Valves status is normal. Unit will display as in the left for 2s
and then start next step.
Ready for units to start debugging. Press main board's SW3
button to confirm startup of debugging. 2s later, main board
will display as below:
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.
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