Additional Charge Calculation - Fujitsu AUXG22KVLA Design & Technical Manual

2-5. Additional charge calculation

CAUTION
• Do not turn on the power unless all operations are complete.
• After evacuating the system, add refrigerant.
• Do not charge the system with a refrigerant other than R32.
• Always keep to the limit on the total amount of refrigerant. Exceeding the limit on the total
amount of refrigerant will lead to malfunction during charging of refrigerant.
• Do not reuse recovered refrigerant.
• When charging the refrigerant, take into account the slight change in the composition of the gas
and liquid phases, and always charge from the liquid phase side whose composition is stable.
Adding refrigerant through the gas pipe will cause a malfunction.
• Check if the steel cylinder has a siphon installed or not before filling. (There is an indication
"with siphon for filling liquid" on steel cylinder.)
Filling method for cylinder with siphon
GAS
Liquid
Filling method for other cylinders
GAS
Liquid
• Be sure to use the special tools for R32 for pressure resistance and to avoid mixing of impure
substances.
• If the units are further apart than the maximum pipe length, correct operation cannot be guaran-
teed.
• Make sure to back closing valve after refrigerant charging. Otherwise, the compressor may fail.
• Minimize refrigerant release to the air. Excessive release is prohibited under the Freon collec-
tion and destruction law.
2-5. Additional charge calculation
Set the cylinder vertical and fill with the liquid.
(Liquid can be filled without turning bottom up with the siphon in-
side.)
Turn bottom up and fill with the liquid.
(Be careful to avoid turning over the cylinder.)
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2. Pipe design