DC Inverter Multi VRF System
27
within range. And restart debugging from step 01.
db
On
05
On
CL
On
Rated capacity ratio of IDU is too low. Change the
combination of IDU and ODU to make the ratio
within range. And restart debugging from step 01.
06_ outdoor
components
db
On
06
On
error
code
On
Outdoor component’s error. LED3
will display the
related error code.
After errors are eliminated,
system will start next step automatically. If power
is off during troubleshooting, then restart
debugging from step 01 after power is on.
db
On
06
On
OC
On
System detects no error on outdoor component.
10s later, next step starts.
07_ Detect
indoor
components
db
On
07
On
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 shown. For
instance, if no.1 IDU has d6 and d7 errors, then
the LED3 digital tube will alternate between
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 step
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 shown on 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 lack of refrigerant and display will be as
shown on the left.
Please cut off power of IDU
and ODU and check if there is leakage on
pipeline.
Solve the leakage problem and add
refrigerant into the unit. Then connect power and
restart debugging from step 01. (Note: Before
re-charging refrigerant, unit must be power off to
avoid starting step 10 automatically.)
db
On
09
On
OC
On
Refrigerant is normal and unit will display as
shown on 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 shown below:
db
On
10
On
U6
On
Ready for units to start debugging.
Press main
board’s SW7 button
to confirm startup of
debugging. 2s later, main board will display as
shown below:
db
On
10
On
OC
On
Valves status is normal. Unit will display as shown
on 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
shown 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 completely charged
before debugging, refrigerant can be added in
this process through the L-VALVE.
