Carrier 53QPCT18H-708F Installation Manual page 30

CONNECTING REFRIGERANT PIPING LINES (Cont.)
16.4 DIAMETERS OF REFRIGERANT PIPING LINES UP TO 20 METER LENGTH
16.5 REFRIGERANT CHARGE
(1) The outdoor unit is factory supplied with refrigerant charge for use with refrigerant piping lines
of length 3 meters and with added 50 grams for air and moisture purge from the system.
(2) For refrigerant piping lines of length more than 3 meters, add in the field 25 grams of refrigerant
per extra meter more than 3 meters :
Example 1 = For 8 meter lines, refrigerant added = (8-3) x 25 = 125 grams.
Example 2 = For 12 meter lines, refrigerant added = (12-3) x 25 = 225 grams.
(3) NOTES
• Refrigerant overcharge may cause a serious trouble of compressor.
• Refrigerant undercharge may cause reduction of system performance.
System Gas line
Model diameter
53QPCT18
53QPCT24
28
Liquid line
diameter
1/2" 1/4"
5/8" 1/4"