Midea Precision AC Technical Manual MCAC-PDSM-2013-01
48
Do not open the system pipeline more than 15 minutes, or it will lead to freeze the cooling oil and
influence the usage lifespan of the key parts in the system and the system operation stability.
The horizontal part of the gas pipe should be sloped down part after led out from the compressor,
its gradient at least should be 1:200 (every 1m should drop 5mm). But if the air exhaust pipe is
located at the place of cooling equipments (including under the block up floor) then it should be
insulated.
Considering the diameter will cause the system pressure drop loss, the copper pipes diameters
connecting between indoor and oudoor units.
Indoor
unit
model
Length 10m 20m 30m 40m 50m 60m
MAD020T1N1S1
Gas
pipe 22mm 22mm 22mm 22mm 22mm 22mm
Liquid
pipe 13mm 13mm 13mm 13mm 16mm 16mm
MAD025T1N1S1
Gas
pipe 22mm 22mm 22mm 22mm 25mm 25mm
Liquid
pipe 13mm 13mm 16mm 16mm 16mm 16mm
MAD030T1N1S1
Gas
pipe 22mm 22mm 22mm 22mm 25mm 25mm
Liquid
pipe 13mm 16mm 16mm 16mm 16mm 16mm
MAD035T1N1S1
Gas
pipe 22mm 22mm 22mm 22mm 25mm 25mm
Liquid
pipe 13mm 16mm 16mm 16mm 16mm 16mm
MAD040T2N1S1
Gas
pipe 22mm 22mm 22mm 22mm 22mm 22mm
Liquid
pipe 13mm 13mm 13mm 13mm 13mm 16mm
MAD045T1N1S1
Gas
pipe 22mm 22mm 25mm 25mm 28mm 28mm
Liquid
pipe 16mm 16mm 16mm 16mm 19mm 19mm
MAD050T2N1S1
Gas
pipe 22mm 22mm 22mm 22mm 25mm 25mm
Liquid
pipe 13mm 13mm 16mm 16mm 16mm 16mm
MAD060T2N1S1
Gas
pipe 22mm 22mm 22mm 22mm 25mm 25mm
Liquid
pipe 13mm 16mm 16mm 16mm 16mm 16mm
MAD070T2N1S1
Gas
pipe 22mm 22mm 22mm 22mm 25mm 25mm
Liquid
pipe 13mm 16mm 16mm 16mm 16mm 16mm
MAD080T2N1S1
Gas
pipe 22mm 22mm 25mm 25mm 28mm 28mm
Liquid
pipe 16mm 16mm 16mm 16mm 19mm 19mm
MAD090T2N1S1
Gas
pipe 22mm 22mm 25mm 25mm 28mm 28mm
Liquid
pipe 16mm 16mm 16mm 16mm 19mm 19mm
Notes:
If the pipe length is more than 60m, please consult the manufacturer.
When the pipe equivalent length is more than 30m, then it needs to install the extended
components. During the extended components installation, to prevent pipelines open, it
suggested that install the extended the electromagnetic valve body components on the outside
of the liquid pipe ball valve, or int the outside or the bottom of the equiment.
So in the electromagnetic valve installation operation process, it do not need to cut the indoor
pipeline, and after the whole system installation, then open the ball valve for pressurizing and
vacuum operation, to avoid moisture absorption of the compressor frozen oil, and ensure that