10.3. REFRIGERANT PIPING WORK
When working with refrigerant piping, the following points must
be carefully observed: no moisture od dust must be allowed to
enter the piping, and there must be no refrigerant leaks.
1. Procedure and precautions for flaring work
a. Cut the pipe
Use a pipe cutter, and cut slowly so the pipe will not be
deformed.
b. Remove burrs and clean shavings from the cut surface
If the shape of the pipe end is poor after removing burrs,
or if shavings adhere to the flared area, it may lead to
refrigerant leaks.
To prevent this, turn the cut surface downward and
remove burrs, then clean the surface, carefully.
c.
Insert the flare nut (be sure to used the same nut that is
used on the AC unit)
d. Flaring
Check the clamp bar and the cleanliness of the copper
pipe.
Be sure to sued the clamp bar to do the flaring with
accuracy. Use either an R410A flaring tool, or a
conventional flaring tool. flaring tools come in different
sizes, so be sure to check the size before using. When
using a conventional flaring tool, use the copper pipe
gauge for clearance adjustment, etc., to ensure the
correct A dimension (see Fig. 10)
Fig. 10 Flaring dimensions
10.3.1. Piping Materials
It is recommended that you use copper and copper alloy jointless pipes with a maximum oil adherence of 40 mg/10m. Do not used
pipes that are crushed, deformed, or discolored (especially the inside surface). If these inferior pipes are used, impurities may clog
the expansion valves or capillaries.
Because the pressure of ACs using R410A is higher than those using R22, it is essential that you select materials that are
appropriate for these standards.
The thickness of the copper tubing used for R410A is shown in Table 10. Please be aware that tubing with a thickness of only 0.7
mm is also available on the market, but this should never be used.
Table 8 Difference between R410A and conventional charging hoses
Soft pipe
Thickness (mm)
Nominal diameter
Outside diameter (mm)
R410A
(Reference) R22
1/4
6.35
0.80
0.80
3/8
9.52
0.80
0.80
1/2
12.7
0.80
0.80
10.3.2. Processing and Connecting Piping Materials
Fig. 11 Relation between the flare nut structure and flaring tool end
51
CS-E15CKP CU-E15CKP5
Summary of Contents for CS-E15CKP
Page 8: ...4 Dimensions 8 CS E15CKP CU E15CKP5 ...
Page 9: ...9 CS E15CKP CU E15CKP5 ...
Page 10: ...5 Refrigeration Cycle Diagram 10 CS E15CKP CU E15CKP5 ...
Page 11: ...6 Block Diagram 11 CS E15CKP CU E15CKP5 ...
Page 12: ...7 Wiring Diagram 12 CS E15CKP CU E15CKP5 ...
Page 39: ...IONIZE 42 43 44 41 39 CS E15CKP CU E15CKP5 ...
Page 40: ...IONIZER IONIZER IONIZER IONIZER 40 CS E15CKP CU E15CKP5 ...
Page 41: ...CZ SFD72P 41 CS E15CKP CU E15CKP5 ...
Page 42: ...42 CS E15CKP CU E15CKP5 ...
Page 43: ... H23 H27 H28 43 CS E15CKP CU E15CKP5 ...
Page 44: ...44 CS E15CKP CU E15CKP5 ...
Page 45: ...45 CS E15CKP CU E15CKP5 ...
Page 75: ...13 Technical Data 75 CS E15CKP CU E15CKP5 ...
Page 87: ...87 CS E15CKP CU E15CKP5 ...
Page 88: ...How to use electronic circuit diagram 88 CS E15CKP CU E15CKP5 ...
Page 89: ...18 1 REMOTE CONTROL 89 CS E15CKP CU E15CKP5 ...
Page 90: ...18 2 PRINT PATTERN INDOOR UNIT PRINTED CIRCUIT BOARD 90 CS E15CKP CU E15CKP5 ...
Page 91: ...18 3 PRINT PATTERN OUTDOOR UNIT PRINTED CIRCUIT BOARD VIEW 91 CS E15CKP CU E15CKP5 ...
Page 92: ...92 CS E15CKP CU E15CKP5 ...
Page 93: ...93 CS E15CKP CU E15CKP5 MAICO Printed in Malaysia ...
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