Midea MEHSU-12CHD2, Installation Manual

Refrigerant Piping Connection

Safety Precautions

 WARNING

•  All field 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:  

Table 7.1: The Maximum Length And Drop 

Height Based on Models. (Unit: m/ft.) 

Type of model

Capacity
 (Btu/h)

Length of 

piping

Maximum drop 

height

  North America, 
Australia

and the 

  eu frequency 
conversion Split 
            Type

<15K

25/82

10/32.8



15K - <24K

30/98.4

20/65.6



24K - <36K

50/164

25/82



36K - 



60K 65/213

30/98.4

Other Split Type

12K

15/49

8/26

18K-24K

25/82

15/49

30K-36K

30/98.4

20/65.6

42K-60K

50/164

30/98.4

Refrigerant Piping with Twin Indoor Units

When installing multiple indoor units with a single outdoor unit, ensure that the length of the 
refrigerant pipe and the drop height between the indoor and outdoor units meet the requirements 
illustrated in the following diagram:

L

L1

L2

H2 

The line branch pipe   

Indoor unit     

Outdoor unit   

H1  

Indoor unit     

The drop height 

between two 

indoor units

 must be less 

than or equal to 

50cm (19.6”)

The drop height 
between indoor  

unit

and outdoor unit 
must be less than 
 or equal to 20m    

(65.6’) 

Fig. 7.1

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 Page 17

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7

 Refrigerant Piping 

       Connection