Gree Ultra Heat GMV-V72W/A-F, Service Manual

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Ultra Heat GMV VRF Technical Service Manual INSTALLATION
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Step 2: Turn on the valves for the liquid and gas pipes of each module completely.
Step 3: Make the system to run in commissioning mode via the commissioning software or the main
board of the ODU. (For details, see the description on commissioning.)
Step 4: When the commissioning step goes to refrigerant perfusion, turn on the valve of the
refrigerant tank and perfuse the remaining quantity.
Step 5: After all refrigerant is perfused, turn off valve of the refrigerant tank and wait till
commissioning is automatically is completed for the system.
Step 6: Remove the pressure gauge to finish refrigerant perfusion.
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Because R410A is a mixture of refrigerant, therefore, it must be charged in a liquid form.
Otherwise, unit will not work stably and effectively.
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Do not expose the R410A refrigerant tank to direct sunlight. Otherwise, the internal pressure may
get too high and cause explosion.
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Pipeline for the R410A refrigerating system must have relevant valid certificates.
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During welding, avoid overheating the pipeline.
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System must not filled with refrigerant other than R410A.
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Pipe to be vacuumed : gas pipe, water pipe, common pipe
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If the refrigerant amount is not exact, it may not operate properly.
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If additionally bottled refrigerant amount is over ±10%, condenser burning or insufficient indoor
unit performance may be caused.