40 / 172 EN
Split Type Air Conditioner / User Manual
6 Air evacuation
6.1.3 Note on adding refrigerant
Some systems require additional charging
depending on pipe lengths. The standard pipe
length varies according to local regulations. For
example, in North America, the standard pipe
length is 7.5m (25’). In other areas, the standard
pipe length is 5m (16‘). The refrigerant should be
charged from the service port on the outdoor unit’s
low pressure valve. The additional refrigerant to
be charged can be calculated using the following
formula:
Additional refrigerant per pipe length
Connective
Pipe Length
(m)
Air
Purging
Method
Additional Refrigerant
<
Standard
pipe length
Vacuum
Pump
N/A
>
Standard
pipe length
Vacuum
Pump
Liquid Side: Ø 6.35 (ø 0.25”)
R32:
(Pipe length – standard length) x 12g/m
(Pipe length – standard length) x 0.13oZ/ft
R290:
(Pipe length – standard length) x 10g/m
(Pipe length – standard length) x 0.10oZ/ft
R410A:
(Pipe length – standard length) x 15g/m
(Pipe length – standard length) x 0.16oZ/ft
R22:
(Pipe length – standard length) x 20g/m
(Pipe length – standard length) x 0.21oZ/ft
Liquid Side: Ø 9.52 (ø 0.375”)
R32:
(Pipe length – standard length) x 24g/m
(Pipe length – standard length) x 0.26oZ/ft
(Pipe length – standard length) x 18g/m
(Pipe length – standard length) x 0.19oZ/ft
R410A:
(Pipe length – standard length) x 30g/m
(Pipe length – standard length) x 0.32oZ/ft
R22:
(Pipe length – standard length) x 40g/m
(Pipe length – standard length) x 0.42oZ/ft
For R290 refrigerant unit, the total amount
of refrigerant to be charged is no more than:
387g (<=9000Btu/h), 447g (>9000Btu/h and
<=12000Btu/h), 547g (>12000Btu/h and
<=18000Btu/h), 632g (>18000Btu/h and
<=24000Btu/h).
A
CAUTION! DO NOT mix
refrigerant types.
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