Bosch Climate 5000 SCI Installation Manual page 16

Refrigerant Piping Connection
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 the 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. Ensure that the pipe is cut at a perfect 90° angle. Refer to Fig. 28
for examples of bad cuts
90°
Oblique
Fig. 28.
Step 2: Remove burrs.
Burrs can affect the air-tight seal of a 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. 29.
Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight seal.
1. After removing burrs from the 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 cannot put them on or change their
direction after flaring. See Fig. 30
Flare nut
Copper pipe
Fig. 30.
16
Rough Warped
Pipe
Reamer
4. Remove the PVC tape from the ends of the pipe when you are ready.
5. Clamp the flare form on the end of the pipe. The end of the pipe
must extend beyond the flare form.
Flare form
Fig. 31.
6. Place the 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 8.
Pipe Tightening torque Flare dimension (A)
gauge (Unit: mm)
Min.
Ø 6.4 18-20 N.m 8.4
(183-204 kgf.cm)
Ø 9.5 25-26 N.m 13.2
(255-265 kgf.cm)
Ø 12.7 35-36 N.m 16.2
(357-367 kgf.cm)
Ø 15.9 45-47 N.m 19.2
(459-480 kgf.cm)
Ø 19.1 65-67 N.m 23.2
(663-683 kgf.cm)
Ø 22 75-85 N.m 26.4
(765-867 kgf.cm)
Table 8. 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.
Indoor unit tubing
Fig. 33.
3. Tighten the flare nut as tightly as possible by hand.
4. Using a spanner, grip the nut on the unit tubing.
5. While firmly gripping the nut, use a torque wrench to tighten the
flare nut according to the torque values in table 8.
Climate 5000 SCI – 6720887405 (2018/04)
Pipe
Flare shape
Max.
90 ° ± 4
8.7
A
13.5
R0.4~0. 8
16.5
Fig. 32.
19.7
23.7
26.9
Pipe
Flare nut