Gree Ultra Heat GMV-VQ72W/A-F, Service Manual, Page: 87 / 207

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial INSTALLATION
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Step 11: Remove the pressure gauge.
2.2 Refrigerant Perfusion During Running
Step 1: Turn off the valve of the refrigerant tank and reconnect the pressure gauge pipe. Disconnect
the low pressure gauge pipe from the detection valve opening of the gas pipe and connect it to the low
pressure check valve, as shown in the following figure.
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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