1. amount of additional refrigerant charge = additional length of liquid pipe x additional amount of
refrigerant charge per meter.
2. Based on the standard pipe length, add the refrigerant according to the requirement shown in the
table above
Method to calculate the amount of additional refrigerant charge (liquid pipe): amount of additional
refrigerant charge = additional length of liquid pipe x additional amount of refrigerant charge per
meter.
Always write the additional refrigerant charge on the data label affixed to the unit outside.
Liquid pipe (mm)
9-12K
Procedure for extending the piping
N.B.:
Improper extension of piping is the main cause of refrigerant leaks. Proceed as shown below:
1. Cut the pipe
•
Check the length of the pipe based on the
distance between the indoor unit and outdoor
unit.
• Cut the required pipe using a pipe cutter.
tubo
inclinato
tubo
tagliatubi
inclinato
irregolare
sbavatura
2. Remove burrs
• Remove burrs with a file,
ensuring they do not go into
the pipe.
V 07/21
Connection pipe diameter
6,35
tagliatubi
irregolare sbavatura
pipe
pipe cutter
slanted
uneven
burred
Gas pipe (mm)
9,52
5. Expand the port
Expand the port using a pipe expander.
allargatubi
forma dura
tubo
N.B.:
• "A"
varies according to diameter:
Outdoor diameter
(mm)
6.35 (1/4")
9.52 (3/8")
Additional refrigerant charge
R32
(g/m)
16
forma
dura
allarga-
tubi
pipe expander
hard mould
pipe
A (mm)
Max.
1.3
1.6
tubo
Min.
0.7
1.0
37