Gree GC201808-III, Service Manual

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GREE GMV5 HR HEAT RECOVERY UNITS
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Step 2: Turn on the valves for the liquid and gas pipes of each module completely. For the modular
unit, the oil-equalizing valve of each module also needs to be turned on.
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 (m`).
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.

Because R410A is a mixture of refrigerant, therefore, it must be charged in a liquid form.
Otherwise, unit will not work stably and effectively.

Do not expose the R410A refrigerant tank to direct sunlight. Otherwise, the internal pressure
may get too high and cause explosion.

Pipeline for the R410A refrigerating system must have relevant valid certificates.

During welding, avoid overheating the pipeline.

System must not filled with refrigerant other than R410A.

Pipe to be vacuumed : gas pipe, water pipe, common pipe

If the refrigerant amount is not exact, it may not operate properly.

If additionally bottled refrigerant amount is over ±10%, condenser burning or insufficient indoor
unit performance may be caused.