Gree GMV6 DC Inverter VRF Units Service Manual
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Step 14: Recharging refrigeration oil
The amount of refrigeration oil needs to be recharged is mainly determined by the total amount of
lubricant poured out from removing components such as compressors and gas-liquid separator. If there
is obvious abnormality, for example, when the amount of lubricant poured out is too little or too much,
empty the lubricant in the system, and then check the section 3 basic parameters of the unit in Chapter
1 to determine the amount of lubricant that needs to be recharged.
The specific amount of additional lubricant is divided into two parts: in the first part, the compressor
lubricant is added according to the number of compressors to be replaced. 1.5L of lubricant is required
for each compressor to be replaced. After replacing the compressors and other parts such as the gas-
liquid separator and filters, use high-pressure nitrogen to clean the pipelines and recharge the second
part of the lubricant according to the lubricant parameters in the section 3 of Chapter 1.
For example:
①
One compressor needs to be replaced for GMV-450WM/G-X and 1L of lubricant is
discharged from the gas-liquid separator and 0.7L is discharged from the oil separator for cleaning
the system. Therefore, 3.2L (1.5L+1L+0.7L) of lubricant needs to be recharged.
②
One compressor needs to be replaced for GMV-280WM/G-X. The gas-liquid separator and
other parts such as filters need to be replaced. The pipelines need to be cleaned by high-pressure
nitrogen. Nearly all the parts are involved and nearly all the lubricant is discharged except for a small
amount remaining in the pipelines. Therefore, 3.5L of refrigeration oil needs to be recharged
according to the parameter form.
Lubricant recharging method:
1) Only FV68H refrigeration oil can be used for the unit. Verify the model number before
recharging. It is forbidden to use the refrigeration oil of a different model number.
2) Connect the gas and liquid valves of the unit and vacuum the unit for over 30 minutes.
3) Connect a rubber tube to the oil charging valve, open the container containing the lubricant,
discharge the lubricant into the measuring cup and measure the appropriate recharging amount. If
the measuring cup capacity is sufficient to measure the appropriate lubricant quantity once, the
lubricant can be recharged in several times. Record the amount of lubricant recharged each time,
then dip the other end of the rubber tube into the lubricant in the measuring cup.
4) Vacuum the unit and open the oil charging valve at the same time to charge the lubricant
into the low-pressure side of the unit by using the atmosphere pressure.
5) When the lubricant needs to be recharged several times, close the oil valve before
measuring the lubricant to be recharged. Keep vacuuming the unit during the process.
6) After the appropriate amount of lubricant is recharged, close and seal the oil charging valve.
