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4-8. Charging the refrigerant
1) Refrigerant charging amount
Calculate the amount of refrigerant to be charged according to the following formula and the liquid piping length for
each size of the piping.
2) Refrigerant charging method
Important reminder
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When charging the refrigerant, accurately measure the length of the piping and charge the proper
amount of refrigerant. If the amount of refrigerant is not proper, performance will decline or a
breakdown could occur.
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After completion of refrigerant charging, write down the installation record on the plate “POINTS
FOR INSTALLATION” inside the outdoor unit control box panel. Also, calculate the refrigerant
amount for the whole system and write down the amount on the plate. The calculation formula is
shown on the plate. (Write with an oil-based marker so that the record does not disappear easily.)
[When 1 indoor unit is connected]
Charge amount (kg)= ( 1 X 0.353) + ( 2 X 0.250) + ( 3 X 0.170) + ( 4 X 0.110) + ( 5 X 0.054) + ( 6 X 0.022) + 5.5
[When 2 or more indoor units are connected]
Charge amount (kg)= ( 1 X 0.353) + ( 2 X 0.250) + ( 3 X 0.170) + ( 4 X 0.110) + ( 5 X 0.054) + ( 6 X 0.022) + 6.5
1
: Liquid piping ø 22.2 total length (m)
2
: Liquid piping ø 19.1 total length (m)
3
: Liquid piping ø 15.9 total length (m)
4
: Liquid piping ø 12.7 total length (m)
5
: Liquid piping ø 9.5 total length (m)
6
: Liquid piping ø 6.4 total length (m)
Caution
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When charging the refrigerant, be sure to wear a pair of leather gloves.
If the refrigerant touches your skin directly, it may cause frostbite.
Important reminder
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Always charge the refrigerant as a liquid in the tank. Charging as a vapor may cause a composi-
tion change of the refrigerant, and could result in a performance decline or a breakdown.
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Always use a refrigerant scale when charging the refrigerant. Using a charging cylinder may
cause a composition change of the refrigerant, and could result in a performance decline or a
breakdown.
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To avoid cross-contamination with other oil types, make sure to separate maintenance tools
according to the type of refrigerant used. In particular, never use the gauge manifold and the
charge hose with other refrigerants (R22, R407C etc.).
[When 1 indoor unit is connected]
Charge amount (lbs)= ( 1 X 0.237) + ( 2 X 0.168) + ( 3 X 0.114) + ( 4 X 0.074) + ( 5 X 0.036) + ( 6 X 0.015) + 12lbs
[When 2 or more indoor units are connected]
1
: Liquid piping 7/8” (ø22.2) total length (ft)
2
: Liquid piping 3/4” (ø19.1) total length (ft)
3
: Liquid piping 5/8” (ø15.9) total length (ft)
4
: Liquid piping 1/2” (ø12.7) total length (ft)
5
: Liquid piping 3/8” (ø9.5) total length (ft)
6
: Liquid piping 1/4” (ø6.4) total length (ft)
Charge amount (lbs)= ( 1 X 0.237) + ( 2 X 0.168) + ( 3 X 0.114) + ( 4 X 0.074) + ( 5 X 0.036) + ( 6 X 0.015) + 14lbs
