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GMV DC Inverter VRF
Debugging code
LED1
Display
Code
status
01~04
ON
4.3 Basic Introduction for Engineering Debugging
4.3.1 Debugging Method
DC inverter multi VRF unit has three debugging methods at present:
(1) Conduct it by pressing the buttons on the main board of outdoor unit.
(2) Install proprietary software to conduct the debugging through PC. Indoor and outdoor units'
parameters displayed simultaneously through PC software.
(3) Use multi-functional debugger.
Note: As for the detailed operation method for debugging, please refer to corresponding
instruction manual.
4.3.2 Debugging Through the Main Board of Outdoor Unit
When conducting the debugging through the main board of outdoor unit, the main board has the
following debugging operation functions.
Step 1: Cover all the front panels of the outdoor unit and open the debugging window of each
basic module.
Step 2: When the outdoor unit is powered off, set one of the modules as the master module. For
the setting method, see "Master Module DIP Switch Code Setting (SA8_MASTER-S)".
Step 3: Under the power-on state of the outdoor unit, set the corresponding static pressure module
for the unit according to the design requirements of the outdoor static pressure of the project.
Step 4: The module address is displayed as "01" is the master module. On the master module,
press and hold the SW3 confirmation button for 5 seconds or press the SW3 confirmation button for
more than 10 seconds to enter the unit debugging function.
Step 5: Wait. The unit automatically runs the steps 01 and 02 at this time.
If the master module is set incorrectly in step 01, the following corresponding fault is displayed in
step 01:
Debugging
—
code
LED1
Progress
Display
Code
status
db
ON
01_ set up
db
ON
master unit
db
ON
According to the above fault phenomenon, reset the master module according to the setting
method of "Master Module DIP Switch Code Setting (SA8_MASTER-S)", and re-enter into the
Progress code
LED2
Display
Code
Code
status
OF
ON
Progress code
LED2
Display
Code
status
01
ON
01
ON
01
ON
Status code
LED3
Display
status
The complete unit has conducted the
debugging and the unit is under standby
OF
ON
status. LED1 displays module address; LED2
and LED3 displays "OF".
Status code
LED3
Display
Code
status
Mater module hasn't been set in the system. It
CC
ON
needs to reset it.
More than two master modules are set in the
CF
ON
system and it needs to reset it.
Mater module of system has been set
successfully. Enter into the next step
OC
ON
automatically.
54
Meaning
Meaning
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