Kaisai KFS-50 HRFI Bedienungsanleitung Seite 97

Step 3: Flare pipe ends
Proper aring 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 are 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 aring. See
Fig. 11.3
Flare nut
Copper pipe
Fig. 11.3
4. Remove PVC tape from ends of pipe when
ready to perform aring work.
5. Clamp are form on the end of the pipe.
The end of the pipe must extend beyond
the are form.
Flare form
Fig. 11.4
6. Place aring tool onto the form.
7. Turn the handle of the aring tool
clockwise until the pipe is fully ared. Flare
the pipe in accordance with the dimensions
shown in table 11.1.
Table 11.1: PIPING EXTENSION BEYOND FLARE
Pipe
gauge
Ø 6.4
Ø 9.5
Ø 12.7
Ø 15.9
Ø 19.1
Ø 22
8. Remove the aring tool and are form,
Step 4: Connect pipes
Connect the copper pipes to the indoor unit rst,
then connect it to the outdoor unit. You should
rst connect the low-pressure pipe, then the
high-pressure pipe.
1. When connecting the are nuts, apply a
2. Align the center of the two pipes that you
Pipe
3. Tighten the are nut as tightly as possible
4. Using a spanner, grip the nut on the unit
5. While rmly gripping the nut, use a torque
NOTE: Use both a spanner and a torque
wrench when connecting or disconnecting
pipes to/from the unit.
97
FORM
Tightening Flare dimension (A)
torque (Unit: mm/Inch)
Min.
18-20 N.m
8.4/0.33
(183-204 kgf.cm)
25-26 N.m
13.2/0.52
(255-265 kgf.cm)
35-36 N.m
16.2/0.64
(357-367 kgf.cm)
45-47 N.m
19.2/0.76
(459-480 kgf.cm)
65-67 N.m
23.2/0.91
(663-683 kgf.cm)
75-85N.m
26.4/1.04
(765-867 kgf.cm)
then inspect the end of the pipe for cracks
and even aring.
thin coat of refrigeration oil to the ared
ends of the pipes.
will connect.
Indoor unit tubing
Fig. 11.6
by hand.
tubing.
wrench to tighten the are nut according
to the torque values in table 11.1.
Flare shape
Max.
90 ° ± 4
8.7/0.34
A
13.5/0.53
R0.4~0.8
16.5/0.65
19.7/0.78
Fig. 11.5
23.7/0.93
26.9/1.06
Pipe
Flare nut