Midea Ducted Series - Refrigerant Piping Connection; Notes on Pipe Length and Elevation; Oil Traps

When connecting refrigerant piping, DO NOT
let substances or gases other than the specified
refrigerant enter the unit. The presence of other gases or substances will lower the unit’s capacity,
and can cause abnormally high pressure in the refrigeration cycle. This can cause explosion and
injury.
Ensure that the length of the refrigerant pipe, the number of bends, and the drop height between the
indoor and outdoor units meets the requirements shown in the table next to it：
Notes on pipe length and elevation
The maximum length and drop height based on models.(Unit:m/ft.)
Type of model
Capacity (Btu/h)
Length of piping Maximum drop height
<15KNorth America,
Australia and The
EU frequency
conversion split
type
Other Split Type
≥15K-<24K
25/82
30/98.4
10/32.8
20/65.6
≥24K-<36K
50/164 25/82
≥36K-<60K
12K
18K-24K
30K-36K
42K-60K
65/213
15/49
25/82
30/98.4
50/164
30/98.4
8/26
15/49
20/65.6
30/98.4
CAUTION
Oil traps
If oil flows back into the outdoor unit’s
compressor, this might cause liquid
compression or deterioration of oil return.
Oil traps in the rising gas piping can
prevent this.
An oil trap should be installed every
6m(20ft) of vertical suction line riser
(＜36000Btu/h unit). An oil trap should be
installed every 10m(32.8ft) of vertical
suction line riser (≥36000Btu/h unit).
Refrigerant Piping Connection
Oil trap
Liquid piping
6m/20ft
(<36000Btu/h unit)
10m/32.8ft
(≥36000Btu/h unit)
6m/20ft
(<36000Btu/h unit)
10m/32.8ft
(≥36000Btu/h unit)
Gas piping
Indoor unit/
Outdoor unit
Indoor unit/
Outdoor unit
20