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The main functions and logic of the outdoor unit are briefly explained
1. Pressure protection function
If the high and low pressure protection is triggered, the outdoor unit compressor will stop and will be restarted after 4 minutes.
2. Current protection function
If the current of the whole machine exceeds the predetermined value in the following table, the system will shut down, and the indoor unit will display the fault code.
3. Compressor discharge temperature protection function
When the exhaust temperature exceeds 100°C, the exhaust protection function is entered, and the liquid spray cooling valve SV6 is powered on and opened, and the exhaust temperature continues to rise by more than 105°C, limiting the frequency increase.
The exhaust gas temperature continues to rise by more than 108°C and decreases frequently, and the exhaust gas temperature continues to rise by more than 115°C, and the shutdown is protected. When the exhaust temperature is less than 85°C, the exhaust protection function will be withdrawn and the normal control will be restored.
4. Hot gas bypass control function
When the ambient temperature is lower than 3 degrees, the SV5 is turned on when the frequency rises to 50Hz during the heating start of the unit, and when the frequency is reduced to 40Hz or the opening time lasts for 15 minutes, it is turned off.
When the ambient temperature is below 3 degrees, after defrosting and oil return is completed, the SV5 turns on when the frequency rises to 50Hz and turns off when the frequency decreases to 40Hz or when the on-time lasts for 15 minutes.
5. Compressor heating with control function
6. Forced refrigeration function
7. Auto priority mode function
The operation mode is judged by the ambient temperature T4 in the priority mode of automatic selection
8. Normal operation parameter table
Electronic control function module and wiring
Fault codes