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(2) Characteristics
a) Pipe sleeve
Copper pipes as R410A pipe sleeves must have a thickness as shown in Table 3 (see Page
59) and Tables 5 and 6 (see Page 61), and sizes of flaring and flare nuts different from those
of R22. Therefore, be sure to select pipe sleeves suitable for R410A.
b) Insulated copper pipes
Before using insulated copper pipes, ensure their thickness is suitable for R410A.
c) Bare copper pipes
Be sure to use bare copper pipes of a thickness as shown in Table 3 (see Page 59) and try to
keep them clean. The surface of bare copper pipes is exposed, so be especially careful to
handle them and mark them to prevent misuse.
(3) Precautions before mounting
Pay attention to the following during pipe connection.
a) Before connecting to the appliance, use caps, etc. to seal all pipe opening.
b) Be especially careful in pipe mounting in rainy days.
If water enters the pipe, the lubricant may deteriorate, which causes failure of the appliance.
c) Connect the pipes as quickly as possible.
If the pipes are kept open for a long time, please fully charge them with nitrogen or use a
vacuum pump for drying.
7.2.4 Welding
(1) Processing connection
Due to fusion cast between the surfaces of joints, which produces very high adhesive strength,
be sure to leave adequate space for welding and keep adequate gap between the surfaces of
joints. The minimum depth of penetration of joint of copper pipe, the outside diameter of inner
pipe and the gap between the outer pipe and the inner pipe are shown in Table 10. If copper
brazing filler is used, the pipe connection is the most secure when the gap is kept between
about 0.05~0.1mm.
Table 10 Minimum depth of penetration and gap between copper pipe and joint
* When inserting the pipe, either process the end of the pipe or connect the pipe with a sleeve
joint through welding.
(2) Brazing filler
a) Alloy brazing filler
Alloy mainly composed of silver and copper is used to bond iron, copper or copper alloy. In
spite of its outstanding solderability, it’s expensive.
b) Phosphor bronze brazing filler
Phosphor bronze brazing filler is generally used to bond copper or copper alloy.
c) Low melting temperature solder
Alloy of tin and lead. Conventional solder. Due to its weak adhesive strength, it can’t be
used for refrigerant pipe welding.
* Notes:
1) BCuP reacts with sulfur easily and produces a complex aqueous solution, which may
cause gas leakage. Therefore, use other types of brazing filler for SPA, etc. and apply
paint on pipe surface.
2) If welding is needed during servicing, please use the same type of brazing filler.
Inside diameter of
outer pipe
D (mm)
Minimum depth of
penetration
B (mm)
Gap
(A-D) x 1/2
(mm)
Summary of Contents for SRC25QA-S
Page 10: ... 7 3 ELECTRICAL WIRING DIAGRAM 3 1 Circuit diagram 25QA S ...
Page 11: ... 8 3 2 Circuit diagram 35QA S ...
Page 22: ... 19 B Prevent Range I in jiggle operation from changing to Range C operation ...
Page 58: ... 55 12 Check method for outdoor unit 1 Circuit diagram of 25QA S outdoor unit ...
Page 59: ... 56 2 Circuit diagram of 35QA S outdoor unit ...
Page 81: ... 78 ...
Page 86: ... 83 RAC SRK35QA S PANEL FAN ASSY ...
Page 88: ... 85 20 21 RYD436A021 LOUVER ASSY 1 20 RYD436A020 LOUVER 12 21 RYD129A048 PLATE CONNECTING 2 ...
Page 92: ... 89 ...
Page 94: ... 91 ...
Page 98: ... ...
Page 100: ... 19 RYF937A002A CLAMP WIRE 1 ...
