DC Inverter Multi VRF System
31
Description of each stage of debugging progress
——
Debugging code
Code meaning and operation method
Progress
LED
Code
Display status
08_ Confirm
preheated
compressor
08/U0
Display
circularly
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).
08/oC
Display
circularly
Compressor has been preheated for 8 hours. 2s later, next
step starts.
09_ Refrigerant
judgments before
startup
09/U4
Display
circularly
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).
09/oC
Display
circularly
Refrigerant is normal and unit will display as in the left for
2s.Then next step starts.
10_ Status
judgments of
outdoor valves
before startup
10/on
Display
circularly
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.
10/U6
Display
circularly
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.
10/oC
Display
circularly
Valves status is normal. Unit will display as in the left for 2s
and then start next step.
12_ Confirm
debugging startup
12/AP
Display
circularly
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:
12/AE
Display
circularly
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
15/AC
Display
circularly
Debugging for cooling mode. If no malfunction occurs for
50min when compressor is running, then the system is
certified as normal. After shutting down the unit for 5s, the
system will enter normal standby status.
15/error
code
Display
circularly
Malfunction occurs when debugging for cooling mode.
16_ Heating
debugging(For
heat pump units
only)
16/AH
Display
circularly
Debugging for heating mode. If no malfunction occurs for
50min when compressor is running, then the system is
certified as normal. After shutting down the unit for 5s, the
system will enter normal standby status.
16/error
code
Display
circularly
Malfunction occurs when debugging for heating mode.
17_ Debugging
finished
OFF
ON
The entire unit has finished debugging and under standby-by
condition.
