Refrigerant Piping Work; Additional Charge - Acson international C serie Handbuch

Refrigerant piping is important in particular. Refrigeration cycle of the split air conditioner is realized
by the perfect piping work.
Piping Length And Elevation
If the piping is too long, both the capacity and reliability of unit will drop. As the number of bends increase, resistance to
flow of refrigerant system increases, thus lowering cooling capacity and as a result the compressor may become defective.
Always choose the shortest path and follow the recommendation as tabulated below:
Maximum length, m (ft)
Max. elevation, m (ft)
Max. number of bends
Liquid pipe size
Gas pipe size
Remark: The refrigerant pre-charged in the outdoor unit is for piping length up to 7.62 m/25 ft.
Piping Connection
• Do not use contaminated or damaged copper tubing. If any piping, evaporator or condenser had been exposed or had been
opened for 15 seconds or more, then vacuum and purge with field supplied refrigerant. Generally, do not remove plastic, rubber
plugs and brass nuts from the valves, fittings, tubing and coils until it is ready to connect suction or liquid line into valves or
fittings.
• If any brazing work is required, ensure that nitrogen gas is passed through coil and joints while the brazing work is being done.
This will eliminate soot formation on the inside wall of copper tubings.
• Cut the pipe stages by stages, advancing the blade of pipe cutter slowly. Extra force and a deep cut will cause more distortion of
pipe and therefore extra burr.
• Remove burrs from cut edges of pipes with a remover. This will avoid unevenness on the flare face which will cause gas leak.
• Align the center of the piping and sufficiently tighten the flare nut with fingers. Finally, tighten the flare nut with torque wrench
until the wrench clicks.
• Be sure to execute heat insulation. (polyurethane form with thickness more than 15 mm)
• Except the outdoor unit which is pre-charge with refrigerant, the indoor unit and the refrigerant connection pipes must be purged
because the air that contain moisture remaining in the refrigerant cycle may cause malfunction to the compressor.

Additional Charge

The refrigerant is pre-charged in the outdoor unit. If the piping length is less than 7.62m (25ft), then additional charge after
vacuuming is not necessary. If the piping length is more than 7.62m (25ft), then use the additional charge valve as indicated in
the table.
Cooling Only (R22 / R407C)
Model Indoor
Outdoor
L = 10 m
L = 12 m
L = 15 m
Heat Pump (R22 / R407C)
Model Indoor
Outdoor
L = 10 m
L = 12 m
L = 15 m
Cooling Only (R410A)
Model
L = 10 m
L = 12 m
L = 15 m
Heat Pump (R410A)
Model
L = 10 m
L = 12 m
L = 15 m

REFRIGERANT PIPING WORK

CK10C/CR CK15C/CR CK20C/CR
MODEL
12 (39)
5 (16.4)
10
1/4"
3/8"
CK10C
SL10B
–
0.036 kg
–
CK10CR
SL10BR
–
0.055 kg
–
CK10C
–
0.032 kg
–
CK10CR
–
0.050 kg
–
12 (39) 15 (49)
5 (16.4) 8 (26.2)
10 10
1/4" 1/4"
1/2" 5/8"
CK15C
SL15B
–
–
–
CK15CR
SL15BR
0.030 kg
0.080 kg
–
CK15C
–
–
–
CK15CR
0.027 kg
0.072 kg
–
1-7
CK20C
SL20B
–
0.021 kg
0.066 kg
CK20CR
SL20BR
–
–
0.065 kg
CK20C
–
0.019 kg
0.059 kg
CK20CR
–
–
0.059 kg