DC Inverter Multi VRF System
25
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
15_ Cooling
debugging
db
On
15
On
AC
On
Debugging for cooling mode. If no
malfunction occurs for 20min when
compressor is running, then system will
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.
16_ Heating
debugging
db
On
16
On
AH
On
Debugging for heating mode. If no
malfunction occurs for 20min when
compressor is running, then system will
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.
17_
Debugging
finished
00
On
AC/AH
On
OFF
On
The entire unit has finished debugging
and under standby-by condition.
5.2.3 Appendix: Reference of Normal Operation Parameters
No.
Debug item
Parameter name
Unit
Reference
1
System
parameters
ODU
parameters
Outdoor
temperature
°C
—
2
Compressor
discharge
temperature
°C
When compressor starts, discharge temp in cool
mode is within 70~105°C and at least 10°C
higher than the high pressure saturation temp.
As for temp in heat mode, it is within 65~90°C
and at least 10°C higher than the high pressure
saturation temp.
3
Defrosting
temperature
°C
In cool mode, defrosting temp is 4~10°C lower
than system’s high pressure value.
In heat mode, defrosting temp is about 2°C
different from system’s low pressure value.
4
System high
pressure
°C
In cool mode, the normal high pressure value is
within 20~55°C. According to the change of
ambient temp and system’s operating capacity,
the high pressure value will be 10~30°C higher
than ambient temp. The higher ambient temp is
the smaller temp difference is. If ambient temp is
25~35°C in cool mode, system’s high pressure
value will be within 44~53°C.
In heat mode, if ambient temp is above -5°C,
system’s high pressure value is within 40~52°C.
If ambient temp is low and many IDUs are turned
on, the high pressure will be lower.
5
System low
pressure
°C
When ambient temp in cool mode is 25~35°C,
the low pressure value is 0~8°C.
When ambient temp in heat mode is above -5°C,
the low pressure value is -15~8°C.
6
Opening degree
of thermal EXV
PLS
In cool mode, the thermal electronic expansion
valve remains 480PLS.
In heat mode, the adjustable opening degree of
EXV is 60~480PLS.
