1
23
Installation
The check valve of the ODU is completely closed when leaving the factory. Unscrew brass nuts
from the check valve in each connection, and connect the flared tube within 5 minutes. When the
brass nuts at the check valve are removed and placed somewhere for too long, dust and other
sundries may enter the pipeline system and cause failures after extended periods of operation.
After the refrigerant piping is connected to the IDU and ODU, follow the operations in "Vacuum
pumping" to exhaust the air. After the air is exhausted, tighten the maintenance nut.
Bend the pipe with your thumb
Processing method
1. Hand bending processing: Applicable to thin copper pipes
(ф6.35mm– ф12.7mm).
2. Mechanical bending processing: Wider application (ф6.35mm–
ф28mm), using spring pipe bender, manual pipe bender or
electric pipe bender.
2
3
Pipe Connection
The bending angle should not exceed 90°; otherwise, wrinkles will be formed in the pipe, which can easily break.
The bending radius should not be smaller than 3.5D (pipe diameter) and should be as large as possible to
prevent the pipe from becoming flattened or crushed.
When mechanically bending the pipe, the pipe bender inserted into the copper pipe must be cleaned.
When it is necessary to fill the piping with nitrogen during welding, the pressure must be kept at 0.02MPa using
a pressure relief valve.
Do not use flux when soldering the refrigerant connection piping. Use a phosphor copper solder that does not
require flux.
Do not use any antioxidants when soldering the piping. The piping may become clogged with residual
antioxidants, which may block components such as electronic expansion valves during operation.
When brazing pipes, fill the pipes with nitrogen. First evenly heat the inner pipes, then the outer pipes, and fill the
joints with welding material.
Caution
Caution
Brazing pipes
Refrigerant
piping
Welding
position
Bandage
Manual valve
Pressure relief valve
Nitrogen
Nitrogen
Summary of Contents for KSEF-22 DN5.0
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