Midea Ducted Series - Note on Adding Refrigerant

NOTE ON ADDING REFRIGERANT
DO NOT mix refrigerant types.
CAUTION
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:
30
R32 :
(Total pipe length -
standard pipe length)x
12g(0.13oZ)/m(ft)
(Total pipe length -
standard pipe length)x
24g(0.26oZ)/m(ft)
(Total pipe length -
standard pipe length)x
40g(0.42oZ)/m(ft)
R22
(orifice tube in the indoor unit):
(Total pipe length -
standard pipe length)x
30g (0.32oZ)/m(ft)
(Total pipe length -
standard pipe length)x
65g(0.69oZ)/m(ft)
(Total pipe length -
standard pipe length)x
115g(1.23oZ)/m(ft)
R22
(orifice tube in the outdoor unit):
(Total pipe length -
standard pipe length)
x15g(0.16oZ)/m(ft)
(Total pipe length -
standard pipe length)
x30(0.32oZ)/m(ft)
(Total pipe length -
standard pipe length)
x60g(0.64oZ)/m(ft)
(Total pipe length -
standard pipe length)
x65g(0.69oZ)/m(ft)
R410A:
(orifice tube in the indoor unit):
(Total pipe length -
standard pipe length)
x30g(0.32oZ)/m(ft)
(Total pipe length -
standard pipe length)
x65g(0.69oZ)/m(ft)
(Total pipe length -
standard pipe length)
x115g(1.23oZ)/m(ft)
R410A:
(orifice tube in the outdoor unit):
(Total pipe length -
standard pipe length)
x15g(0.16oZ)/m(ft)
(Total pipe length -
standard pipe length)
x30g(0.32oZ)/m(ft)
Only for Australia models :
• This unit contains factory charged refrigerant covering 20m of refrigerant piping and additional
refrigerant charge on the installation site is not required for an installation with up to 20m refrigerant
piping. When refrigerant piping exceeds 20m, additionally charge an amount calculated from the pipe
length and the above table for the portion in excess of 20m.
• If an existing pipe system is used, a required refrigerant charge volume will vary depending on the liquid
pipe size.
Formula to calculate the volume of additional refrigerant required：
Additional charge volume (kg) = { Main length (m) – Factory charged volume 20(m) } × 0.03(kg/m)
• Make sure to remove the additional refrigerant amount according to the nameplate rated charge
(under 5m refrigerant piping ) under market or government verification testing.
CAUTION
DO NOT mix refrigerant types.