Refrigerant Pipe Installation - Midea BREEZELESS Technical Manual

Do not lean it more than 45, and do not lay it sidelong.
Make concrete foundation according to the specifications
of the outdoor units.
Fasten the feet of this unit with bolts firmly to prevent it
from collapsing in case of earthquake or strong wind.
4.4 Install drain joint
Heat pump units require a drain joint. Before bolting the
outdoor unit in place, you must install the drain joint at the
bottom of the unit. Note that there are two different types
of drain joints depending on the type of outdoor unit.
• If the drain joint comes with a rubber seal (see
Fig. A ), do the following:
1. Fit the rubber seal on the end of the drain joint that will
connect to the outdoor unit.
2. Insert the drain joint into the hole in the base pan of the
unit.
3. Rotate the drain joint 90° until it clicks in place facing
the front of the unit.
4. Connect a drain hose extension (not included) to the
drain joint to redirect water from the unit during heating
mode.
• If the drain joint doesn't come with a rubber seal
(see Fig. B ), do the following:
1. Insert the drain joint into the hole in the base pan of the
unit. The drain joint will click in place.
2. Connect a drain hose extension (not included) to the
drain joint to redirect water from the unit during heating
mode.
Seal
Seal
Drain joint
A
 Page 42 
Base pan hole of
outdoor unit
B

5. Refrigerant Pipe Installation

5.1 Maximum length and drop height
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
following table.
Max. Length
Capacity(k )
Btu/h
12
caution:
• The capacity test is based on the standard length and
the maximum permissive length is based on the system
reliability.
• Oil traps
If the indoor unit is installed higher than the outdoor unit:
-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 10m(32.8ft) of vertical
suction line riser.
The indoor unit is installed higher than the outdoor unit
If the outdoor unit is installed higher than the indoor unit:
-It is recommended that vertical suction risers not be
upsized. Proper oil return to the compressor should be
maintained with suction gas velocity. If velocities drop
below 7.62m/s(1500fpm (feet per minute)), oil return
will be decreased. An oil trap should be installed every
6m(20ft) of vertical suction line riser.
Max. Elevation
(m/ft) (m/ft)
25/82 10/33