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(iv) Additional refrigerant charge
Additional refrigerant charge
Charge additional refrigerant in the liquid state.
Be sure to measure the quantity with a scale in adding refrigerant.
If you cannot charge all refrigerant with the outdoor unit lying idle, charge it with the unit running in the test run mode. (For
the test run method, please refer to Section 8)
If operated for a long time with insufficient refrigerant the compressor will be damaged. (In particular, when adding refriger-
ant during operation, complete the job within 30min.)
Fill this unit only with the standard amount of refrigerant (piping length 0m fill quantity).
Determine the amount of refrigerant to be charged additionally using the following formula and put down the amount of
refrigerant added on the refrigerant charge volume recording plate provided on the back of the side panel.
● Adding additional refrigerant
Charge additional refrigerant according to the size and length of the liquid piping
Determine additional charge volume by rounding to the nearest 0.1 kg.
● A standard refrigerant charge volume means a refrigerant charge volume for an installation with 0m long refrigerant
piping.
● This unit contains factory charged refrigerant covering 30m of refrigerant piping and additional refrigerant
charge on the installation site is not required for an installation with up to 30m refrigerant piping.
When refrigerant piping exceeds 30m, additionally charge an amount calculated from the pipe length and the above table
for the portion in excess of 30m.
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● If the pipe length is shorter than 5 m, you should charge a reduced refrigerant volume.
Recover the refrigerant from the system and charge the standard refrigerant charge + the amount for
liquid pipe.
Pay attention to the following points in addition to the above for the R410A and compatible machines.
● To prevent a different oil from entering, please assign dedicated tools, etc. to each refrigerant type. Under no circumstances
must a gauge manifold and a charge hose in particular be shared with other refrigerant types (R22, R407C, etc.).
● Refrigerant types are indicated by color at the top of the cylinder. (Pink for R410A). Always confirm this.
● Do not use a charge cylinder under any circumstances. There is a danger that the composition of the refrigerant will
change when R410A is transferred to a cylinder.
● When charging refrigerant, use liquid refrigerant from a cylinder.
● Use a Adverse current prevention adapter so that vacuum pump oil does not mix in a system.
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