3 Piping work and refrigerant charge
General notes before performing pipe work
SMGB0136 rev.0 - 07/2021
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3.1 General notes before performing pipe work
3.1.1 Piping Materials
1 In order to avoid supply problems in terms of local regulations and quality, prepare locally-supplied copper pipes.
? NOTE
In case of using copper pipes for piping sections bigger than Ø19.05 mm (3/4 inches), aring work cannot be performed. If necessary,
use a joint adapter.
2 Select the piping size with the correct thickness and correct material able to withstand sufcient pressure.
3 Select clean copper pipes. Make sure there is no dust and moisture inside. Blow the inside of the pipes through with
oxygen-free nitrogen to remove any dust and foreign materials before connecting pipes.
4 After connecting the refrigerant piping, seal the open space between the knockout hole and refrigerant pipes by using
insulation material as shown below:
A. Insulator material.
B. Field-supplied refrigeration pipe.
! CAUTION
• Do not use saws, grindstones or other tools which cause copper
powder.
• When cutting pipes, secure the part for brazing in accordance with
both national and local regulations.
• Use security glasses and gloves for cutting or welding works.
Piping Connection
Fix the connecting pipe as shown in the following gure using the insulation attached to the Indoor Unit.
A. Use the are nut of the indoor unit.
B. Insulate this part with the attached insulation.
C. Fix this part with the attached cord band or with tape.
D. Field-supplied refrigerant piping.
E. Field-supplied insulation.
F. Brazing.
G. Make ares after attaching are nut to the connecting pipe in
the Multi-kit package.
H. Insulation attached to indoor unit.
I. Indoor unit.
? NOTE
• A system with no moisture or oil contamination will give maximum performance and lifecycle compared to a poorly prepared system.
Take particular care to ensure that all copper piping is clean and dry internally.
• To ensure this, blow oxygen-free nitrogen through the pipes.
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