Refrigerant Piping Connection Instructions - Midea MTIU-12HWFNX-QRD0W Installation Manual

Middle static pressure duct type
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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 larger than the main pipe, take
the larger 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
)
48K
"
Φ15.9(0.626
)
"
60K
Φ15.9(0.626
)

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.
Page 20
Table 7.2
Permitted length
18K+18K
30m/98'
24K+24K
50m/164'
30K+30K
15m/49'
10m/32.8'
20m/65.6'
0.5m/1.6'
Available
Liquid side
branching pipe
"
"
)
Φ6.35(0.25
)
CE-FQZHN-01C
"
"
)
Φ9.5(0.375
)
CE-FQZHN-01C
"
"
CE-FQZHN-01C
)
Φ9.5(0.375
)
The 1st branching pipe
CE-FQZHN-01C
"
Φ9.5(0.375
)
CE-FQZHN-01C
"
Φ9.5(0.375
)
"
CE-FQZHN-01C
Φ9.5(0.375
)
Step1: Cut pipes
When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
L+Max
(L1, L2)
ensure efficient operation and minimize the
need for future maintenance.
L1, L2
1. Measure the distance between the indoor
and outdoor units.
L1-L2
2. Using a pipe cutter, cut the pipe a little
H1
longer than the measured distance.
H2
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°
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 dow n
Rough
Oblique
Warped
Fig. 7.4
Pipe
Reamer
Fig. 7.5

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