DC Inverter Multi VRF System User Manual
20
07_Detect
indoor
components
db
On
07
On
XXXX/
Error
code
On
System detects error on indoor components. XXXX means the
project code of IDU with error. 3s later, related error code will be
showed. For instance, if no.1 IDU has d6 and d7 errors, then the
LED3 digital tube will show circularly 00,01,d5,d6,07,92,d6,d7
every 2s.
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.
db
On
07
On
OC
On
No error on components of IDU. 2s later, next step starts.
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.
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 30min when compressor is running, then system will
start progress 17;
or you can press SW7 to confirm it
manually.
After confirmation, system will also start progress
17. If malfunction occurs, unit will display as below:
db
On
15
On
Error
code
On
Malfunction occurs when debugging for cooling mode.
After all malfunctions are eliminated,
system will
start next step. If power is off during troubleshooting,
system will start progress 17 automatically when power is
resumed.
16_ Heating
debugging
db
On
16
On
AH
On
Debugging for heating mode. If no malfunction occurs
for 30min when compressor is running, then system will
start progress 17;
or you can press SW7 to confirm it
manually.
After confirmation, system will also start progress
17. If malfunction occurs, unit will display as below:
db
On
16
On
Error
code
On
Malfunction occurs when debugging for heating mode.
After all malfunctions are eliminated,
system will start
next step. If power is off during troubleshooting, system will
start progress 17 automatically when power is resumed.
17_Debugging
finished
01
On
OFF
On
OFF
On
The entire unit has finished debugging and under
standby-by condition.
