DC Inverter Multi VRF System
28
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
08_ Confirm
preheated
compressor
db
On
08
On
UO
On
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
SW7 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).
db
On
08
On
OC
On
Compressor has been preheated for
8 hours. 2s later, next step starts.
09_ Refrigerant
judgments
before startup
db
On
09
On
U4
On
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).
db
On
09
On
OC
On
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
db
On
10
On
ON
On
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.
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.
