Climate 5000 SCI – 6720887422 (2019/07)
17
Refrigerant Piping Connection
Step 1: 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.
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. 37
for examples of bad cuts
90°
Oblique
Rough
Warped
Fig. 37.
Step 2: Remove burrs.
Burrs can affect the air-tight seal of the 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.
Pipe
Reamer
Point down
Fig. 38.
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. Ensure they are facing in the
right direction, because you cannot put them on or change their
direction after flaring. See Fig. 42.
Flare nut
Copper pipe
Fig. 39.
4. Remove PVC tape from ends of pipe when ready to perform flaring
work.
5. Clamp flare form on the end of the pipe. The end of the pipe must
extend beyond the flare form.
Flare form
Pipe
Fig. 40.
6. Place flaring tool onto the form.
7. 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 12.
Pipe
gauge
Tightening torque
Flare dimension (A)
(Unit: mm)
Flare shape
Min.
Max.
Ø 6.4
18-20 N.m
(183-204 kgf.cm)
8.4
8.7
Flare shape
.
R0.4~0. 8
45
°±
2
90
°
±
4
A
Fig. 41.
Ø 9.5
25-26 N.m
(255-265 kgf.cm)
13.2
13.5
Ø 12.7
35-36 N.m
(357-367 kgf.cm)
16.2
16.5
Ø 15.9
45-47 N.m
(459-480 kgf.cm)
19.2
19.7
Ø 19.1
65-67 N.m
(663-683 kgf.cm)
23.2
23.7
Ø 22
75-85 N.m
(765-867 kgf.cm)
26.4
26.9
Table 12. PIPING EXTENSION BEYOND FLARE FORM
8. Remove the flaring tool and flare form, then inspect the end of the
pipe for cracks and even flaring.
Step 4: Connect pipes
Connect the copper pipes to the indoor unit first, then connect it to the
outdoor unit. You should first connect the low-pressure pipe, then the
high-pressure pipe.
1. When connecting the flare nuts, apply a thin coat of refrigeration oil
to the flared ends of the pipes.
2. Align the center of the two pipes that you will connect.
