D.C. Inverter Multi VRF Modular 
 
58 
Debugging is finished. System is on 
standby condition. LED1 displays module 
address. LED2 and LED3 display “OF”. 
Step 19: 
after  debugging  is  finished,  some  functions  can  be  set  up  according  to  project’s 
actual  needs.  For  specific  details,  please  refer  to  System  Functions  Setup.  If  no  special 
requirements, skip this step. 
Step 20:
 deliver the product to user and inform user about usage precautions. 
5.2.3 Appendix: judgment reference of normal operational parameters 
Reference of Debug Parameters of GMV5 DC Inverter Multi VRF System 
Discharge tube temp of 
inverter compressor 1 
●When system compressor starts up, temp of discharge 
tube or casing top in cooling mode is within 70~95
℃
  , and 
at least 10
℃
  higher than system high pressure saturation 
temp; Temp in heating mode is within 65
℃
~80
℃
  , and at 
least 10
℃
  higher than system high pressure saturation 
temp.   
●When inverter compressor starts but inverter compressor 2 
stops, the discharge tube temperature of inverter 
compressor 2 is almost the same with ambient temp. 
Casing top temp of 
inverter compressor 1 
Discharge tube temp of 
inverter compressor 2 
Casing top temp of 
inverter compressor 2 
●In cooling mode, defrost temp1 is 5~11
℃
  lower than 
system high pressure value; 
●In heating mode, defrost temp1 is about 2
℃
  different from 
system low pressure value. 
●System’s normal high pressure value is within 20
℃
  ~25
℃
. 
According to the change in ambient temp and system 
operational capacity, system’s high pressure value is 10 
~40
℃
  higher than ambient temp The higher ambient temp 
is, the smaller temp difference is. 
●When ambient temp is 25~35
℃
, system’s high pressure 
value in cooling mode is 44~53
℃
. 
●When ambient temp is -5~10
℃
, system’s high pressure 
value in heating mode is 40~52
℃
. 
●When ambient temp is 25~35
℃
, system’s low pressure 
value in cooling mode is 0~8
℃
. 
●When ambient temp is -5~10
℃
, system’s low pressure 
value in heating mode is -15~5
℃
. 
Opening angle of heating 
EXV 
●In cooling mode, heating electronic expansion valve 
remains 480PLS. 
●In heating mode, the opening angle of adjustable electronic 
expansion valve varies within 120~480PLS. 
Operating freq. of 
inverter compressor 1 
Current of inverter 
compressor 1 
●According to different operating freq. and different load, 
current will vary from 7A to 25A. 
IPM temp of inverter 
compressor 1 
●When ambient temp is lower than 35
℃
, IPM temp is below 
80
℃
. Highest temp won’t be above 95
℃
.