33
Commissioning
6-1. Inspections before Commissioning
• Appearance inspection
Check the appearance and internal parts of the unit for any damage.
• Fan and motor inspection
Check whether the fan is straight and if there is any foreign matter and dirt on the blades and whether the blades are damaged.
• Electrical wiring inspection
Check if the power line and communication line are installed as required, make sure the cooling system and the electrical system are the
same.
• Power supply inspection
Check and make sure the wirings of L1, L2, L3, N and PE are correct and the voltage frequency of the power supply is consistent with the
requirements on the unit nameplate.
• Toggle switch setup inspection
Check whether the outdoor toggle switch setup is correct. If module combination is used, check if the settings of host module and sub mod
ule are correct.
Note: All the toggle switches must set to valid under power off condition.
• Power-on time inspection
Make sure the power supply is on for at least 24 hours to guarantee the complete warm up of the compressor.
• Water quality inspection for water system, check if the system is rinsed.
• Pump commissioning
Open the pump manually, check if the water flow direction and the current are correct.
• Check if the rotation direction of the inching fan is correct.
6-2. Unit Commissioning
•
As soon as the unit is turned on, use ampere meter to check if the phase currents of the compressor and the fan and the total voltage are
correct; check if the reading of the pressure gauge is correct;
•
Check if the water pressure of water system is normal;
•
Check if all the terminal controls and all the temperatures are normal;
•
After running the unit for an hour, check if each parameter is normal every half an hour and make records.
•
Starting order of the unit
Cooling mode
1) Starting process for cooling mode: Select cooling mode – start the unit – display water temperature – the electronic expansion valve
reaches initial opening after 5s – pump starts to run when the electronic expansion valve reaches required opening – no flow switch
detection for 100s – the fan starts to operate after 15s – one compressor starts to operate after 5s – end of starting process.
2) Stopping process for cooling mode: Stop cooling – compressor B-2 stops after 5s - compressor A-2 stops after 2s - compressor B-1 stops
after 2s - compressor A-1 stops after 2s – the electronic expansion valve closes after 2s – the fan stops after 60s – the pump stops after
90s – end of stopping process.
Heating mode
1) Starting process for heating mode: Select heating mode – start the unit – display return water temperature – the four-way valve starts
running and the electronic expansion valve reaches initial opening after 5s – pump starts to run when the electronic expansion valve
reaches required opening – no flow switch detection for 100s – the fan starts to operate and initiate return loop electric heating after 15s –
one compressor starts to operate after 5s – end of starting process.
2) Stopping process for heating mode: Stop heating – compressor B-2 stops after 5s - compressor A-2 stops after 2s - compressor B-1 stops
after 2s - compressor A-1 stops after 2s – the return loop electric heating stops and the electronic expansion valve closes after 2s – the
fan stops after 60s – the pump stops after 90s – the four-way valve stops after 1s - end of stopping process.
For CXAJ130 unit, each system will start one compressor first before initiating the second compressor.
After finishing unit module setup, the units will start one by one based on code address (from low to high) upon first start-up; the execution
temperature for adding and removing of units is different based on different codes, please refer to unit code setup for details.
6 Commissioning
