Carrier 53KHET 12 Installation Manual page 30

CONNECTING REFRIGERANT PIPING LINES (Cont.)
16.5 DIAMETERS AND LENGTHS OF REFRIGERANT PIPING LINES
Model
Size 12K
Size 18K
Size 24K
16.6 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 10 meter lines, refrigerant added = (10-3) x 25 = 175 grams.
(3) NOTES
• Refrigerant overcharge may cause a serious trouble of compressor.
• Refrigerant undercharge may cause reduction of system performance.
Gas line Liquid line
diameter diameter
3/8" 1/4"
1/2" 1/4"
5/8" 3/8"
28
Max. Line
Length (MT)
10
20
20