Midea MFYA400-24HRFN8-QRD0W User Manual page 76

Connection Instructions—
Refrigerant Piping
Step 1: Cut pipes
When preparing refrigerant pipes, take
extra care to cut and flare them properly.
This will ensure e cient operation and
minimize the need for future maintenance.
•
Measure the distance between the
indoor and outdoor units.
•
Using a pipe cutter, cut the pipe a
little longer than the measured
distance.
•
Make sure that the pipe is cut at a
perfect 90° angle.
90°
Oblique
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 e ciency
of the unit.
Step 2: Remove burrs
Burrs can a ect the air-tight seal of
refrigerant piping connection. They must be
completely removed.
Hold the pipe at a downward angle to
•
prevent burrs from falling into the pipe.
•
Using a reamer or deburring tool, remove
all burrs from the cut section of the pipe.
Point down
Rough Warped
Pipe
Reamer
Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight seal.
• After removing burrs from cut pipe, seal the ends
with PVC tape to prevent foreign materials from
entering the pipe.
• Sheath the pipe with insulating material.
• 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.
Flare nut
Copper pipe
• Remove PVC tape from ends of pipe when ready
to perform flaring work.
• Clamp flare from on the end of the pipe. The end
of the pipe must extend beyond the flare form.
Flare form
• Place flaring tool onto the form.
•
Turn the handle of the flaring tool clockwise
until the pipe is fully flared. Flare the pipe in
accordance with the dimensions shown in table .
PIPING EXTENSION BEYOND FLARE FORM
Pipe Tightening
gauge torque
(180-200kgf.cm)
32-39 N.m
(320-390kgf.cm)
49-59 N.m
(490-590kgf.cm)
57-71 N.m
(570-710kgf.cm)
67-101 N.m
(670-1010kgf.cm)
85-110 N.m
(850-1100kgf.cm)
• Remove the flaring tool and flare form, then
inspect the end of the pipe for cracks and even
flaring.
20
Pipe
Flare dimension(A)
(Unit:mm/lnch)
Flare shape
Min. Max.