Heat Recovery DC Inverter Multi VRF Unit
51
ng
completion
status
unit is in standby status. LED1 displays module
address. LED2 and LED3 display “OF”.
5.2.2.2 Debugging operation mode
The series has two debugging modes: one is direct operation on main board of outdoor units
while the other is PC operation via special software. In PC software debugging, indoor/outdoor
parameters can be displayed and historical data can be recorded and inquired. (Operation details can
be found in relevant instruction manuals)
Debugging through operation on main board of outdoor units.
In this debugging mode, following debugging functions are included on the main board:
Step 1: front panel of the outdoor units must be fully closed. Open the debugging window of each
basic module;
Step 2: disconnect power for outdoor units. According to design requirements of external static
pressure, set up corresponding static pressure mode for the units. Setting methods can be seen in
Outdoor Fan Static Pressure Setup SA6_ESP_S;
Step 3: disconnect power for outdoor units and set one module as a master unit. Setting method s
can be seen in Master Unit Setup SA8_MASTER_S;
Step 4: Connect power for all indoor units. Make sure all IDUs are power on. Then all outdoor
modules will display “Debugging not enabled”;
Step 5: Find the module with “01” module address to be the master module. Hold SW7 button on
the master module for at least 5s to enable debugging;
Step 6: Wait. Unit will then start progress 01 and 02; in progress 01; if master unit is not correctly
set, progress 01 will show the following errors:
Debugging code
Progress code
Status code
Meaning
Progress
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
01_Set
master unit
db
On
01
On
CC
On
Master unit hasn’t been set. Please set it.
db
On
01
On
CF
On
Master unit is two or more than two. Please reset.
db
On
01
On
OC
On
Master unit has been set successfully. Next step
will start automatically.
According to the above errors, reset the master unit as instructed in Master Unit Setup
SA8_MASTER_S. After reset is finished, start debugging again.
In progress 02, if master IDU is not detected, then progress 02 will show the following errors:
LED1
LED2
LED3
Function code
Display mode
Current progress
Display mode
Current
progress
Display mode
db
On
02
On
L7
Blink
At this time, all buttons are ineffective. Set master IDU in 1min via debugging software. If master
IDU is not set in 1min, system will set up a master IDU randomly. After that, system will start next
progress.