CONNECTING REFRIGERANT PIPING LINES
18.4 REFRIGERANT CHARGE
(1) The outdoor unit is factory supplied with refrigerant charge for use with refrigerant piping lines
of length 5 meters.
(2) For refrigerant piping lines of length more than 5 meters, add in the field extra amount of
refrigerant charge as per below table :
System
Model
Extra Amount of Refrigerant / Meter
Examples :
For system Model 53KDMT18N-718
For 10 meter lines, refrigerant added = ( 10 – 5 ) x 15 = 75 grams.
For 20 meter lines, refrigerant added = ( 20 – 5 ) x 15 = 225 grams.
18.4.1 NOTES
x Refrigerant overcharge may cause a serious trouble of compressor.
x Refrigerant undercharge may cause reduction of system performance.
x Refrigerant cannot be charged until all field electrical wiring has been completed.
x Refrigerant may only be charged after performing leak testing and air purging using
vacuum pump.
x When charging the system, care shall be taken that the maximum permissible refrigerant
charge is never exceeded to protect the compressor against liquid hammer.
x Charging with an unsuitable refrigerant may cause explosions and accidents, so always
ensure that R410A refrigerant is charged.
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