Midea MCA3I-09FNXD0 Owner's Manual page 33

Refrigerant Piping Connection
Safety Precautions
WARNING
• All eld piping must be completed by a
licensed technician and must comply with
the local and national regulations.
• When the air conditioner is installed in a
small room, measures must be taken to
prevent the refrigerant concentration in
the room from exceeding the safety limit
in the event of refrigerant leakage. If the
refrigerant leaks and its concentration
exceeds its proper limit, hazards due to
lack of oxygen may result.
• When installing the refrigeration system,
ensure that air, dust, moisture or foreign
substances do not enter the refrigerant
circuit. Contamination in the system may
cause poor operating capacity, high
pressure in the refrigeration cycle,
explosion or injury.
• Ventilate the area immediately if there is
refrigerant leakage during the installation.
Leaked refrigerant gas is both toxic and
flammable. Ensure there is no refrigerant
leakage after completing the installation
work.
Notes On Pipe Length and Elevation
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 Table 7.1:
 Page 16 
Table 7.1: The Maximum Length And Drop
Height Based on Models. (Unit: m/ft.)
Type of model Capacity
(Btu/h)
<15K
North America,
Australia and the
≥15K - <24K
eu frequency
≥24K - <36K
conversion Split
Type
≥36K - ≤60K
12K
18K-24K
Other Split Type
30K-36K
42K-60K
CAUTION
• 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.(See Fig. 7.1)
Fig. 7.1
The indoor unit is installed higher than the outdoor unit
7
Length of Maximum drop
piping height
25/82 10/32.8
30/98.4 20/65.6
50/164 25/82
65/213 30/98.4
15/49 8/26
25/82 15/49
30/98.4 20/65.6
50/164 30/98.4