Refrigerant Piping Connection Instructions - Midea MTI-24FNXD0 MOU-24FN1-QD0 Instruction Manual

Table 7.2
Total piping length
(farthest distance from
Piping
the line pipe branch)
length
(farthest distance from
the line pipe branch)
Drop height between
Drop
indoor and outdoor unit
height
Drop height between
two indoor units
Size of joint pipes for indoor unit
Size of joint pipes for 410A indoor unit
Table 7.3
Capacity
Size of main pipe(mm)
of indoor
Gas side
unit (A)
18K
Φ12.7(0.5
24K
Φ15.9(0.626
30K
Φ15.9(0.626
Size of joint pipes for outdoor unit
Base on the following tables, select the diameters
of the outdoor unit connective pipes. In case of the
main accessory pipe large than the main pipe, take
the large one for the selection.
Size of joint pipes for 410A outdoor unit
Table 7.4
the size of main pipe(mm)
Model
Gas side Liquid side
36K "
Φ15.9(0.626 ) Φ9.5(0.375
48K
"
Φ15.9(0.626 ) Φ9.5(0.375
60K "
Φ15.9(0.626 ) Φ9.5(0.375

Refrigerant Piping Connection Instructions

CAUTION
The branching pipe must be installed
•
horizontally. An angle of more than 10° may
cause malfunction.
DO NOT install the connecting pipe until both
•
indoor and outdoor units have been installed.
Insulate both the gas and liquid piping to
•
prevent water leakage.
Step1: Cut pipes
When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
ensure efficient operation and minimize the
need for future maintenance.
1. Measure the distance between the indoor
and outdoor units.
2. Using a pipe cutter, cut the pipe a little
longer than the measured distance.
 Page 20 
Permitted length
18K+18K 30/98' L+Max
(L1, L2)
24K+24K 50/164'
30K+30K
15/49' L1, L2
10/32.8' L1-L2
20/65.6' H1
0.5/1.6' H2
Available
Liquid side
branching pipe
" "
) Φ6.35(0.25 ) CE-FQZHN-01C
" "
CE-FQZHN-01C
) Φ9.5(0.375 )
" "
) Φ9.5(0.375 ) CE-FQZHN-01C
The 1st branching pipe
CE-FQZHN-01C
"
)
CE-FQZHN-01C
"
)
" CE-FQZHN-01C
)
CAUTION
DO NOT deform pipe while cutting. Be extra
careful not to damage, dent, or deform the pipe
while cutting. This will drastically reduce the
heating efficiency of the unit.
1. Make sure that the pipe is cut at a perfect
90° angle. Refer to Fig. 7.4 for examples
of bad cuts
90°
Oblique
Fig. 7.4
Step2: Remove burrs.
Burrs can a ect the air-tight seal of refrigerant
piping connection. They must be completely
removed.
1. Hold the pipe at a downward angle to
prevent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove
all burrs from the cut section of the pipe.
Point down
Fig. 7.5
Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight seal.
1. After removing burrs from cut pipe, seal
the ends with PVC tape to prevent foreign
materials from entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe. Make
sure they are facing in the right direction,
because you can't put them on or change
their direction after flaring. See Fig. 7.6
Flare nut
Copper pipe
Fig. 7.6
4. Remove PVC tape from ends of pipe when
ready to perform flaring work.
Rough
Warped
Pipe
Reamer