Why aircon material the copper pipe thickness not the same with the official recommendation?

[The_King]

For R32 gas, the recommendation is the copper pipe should not be thinner then 0.8mm, so the material should be SWG21 (0.81mm) but many aircon company give SWG22 which is 0.71mm

 

anyone have know the reason?

 

 

 

sauce :

toshiba installation manual

Thickness of copper pipes used R32 must be more than 0.8mm. Never use copper pipes thinner than 0.8mm.
page 3: https://www.toshiba-aircon.co.uk/wp-content/uploads/2018/05/20180404_IM_1120650130_R32_MIRAI_RAS-24BKVG-E_RAS-24BAVG-E_EN.pdf

 

Panasonic installation manual

For connection piping, use copper phosphate seamless pipes (1220T) as regulated in "JIS H 3300" and the pipe
thickness is 0.8 mm.
In the market, there are some pipes of 0.7 mm thickness, but do not use these pipes (0.8 mm thickness has to be strictly followed).

page 48: https://www.manualslib.com/manual/1175421/Panasonic-Cs-Vz9ske.html?page=48

 

Fujitsu installation manual

Thicknesses of copper pipes used with R32(R410A) are as shown in Table1. Never use copper pipes thinner than 0.8 mm even when it is available on the market.

page 3: https://www.energex.com.au/__data/assets/pdf_file/0004/343282/Fujitsu-Installation-Guide-R32-Refrigerant-Models.pdf

 

Mitsubishi starmex  installation manual

Refrigerant pipes Minimum wall thickness 0.0315inch or 0.8mm
page 2: https://www.theacoutlet.com/documents/Installation-Guide-Mitsubishi-MUYGE.pdf

[ODACHEK]

Usually home owners dun measure thickness of pipe and assume contractors are honest.

[The_King]

1 hour ago, ODACHEK said:

Usually home owners dun measure thickness of pipe and assume contractors are honest.

aircon company give SWG22 but the manufacturer recommend SWG21. it become buyer have to do their own research to get the correct parts and cannot trust the retail shop