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The check valve of the ODU is completely closed when leaving the factory. Unscrew the nuts from the check
valve in each connection, and connect the flared tube within 5 minutes. When the nuts at the check valve are
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removed and placed somewhere for too long, dust and other sundries may enter the pipeline system and cause
failures after extended operation.
After the refrigerant piping is connected to the IDU and ODU, follow the operations in "Vacuum pumping" to
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exhaust the air. After the air is exhausted, tighten the maintenance nut.
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Pipe Connection
Bend the pipe with your thumb
[ Caution ]
When bending pipes, the copper pipes shall not be wrinkled or deformed on the inside.
When a spring pipe bender is used, clean it before it is inserted into the copper pipe.
The bending angle should not exceed 90°; otherwise, wrinkles will form in the pipe, which increases the likelihood of
breakage.
Do not leave any dents in the pipe when you bend the pipe. The cross-sectional area of the bent pipe must exceed 2/3
of the original pipe section.
1. Brazing pipes
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 ]
Nitrogen pressure is kept at about 0.2–0.3kgf/cm
Use nitrogen for welding. Do not use flammable gas such as oxygen to avoid the risk of explosion.
Use a pressure relief valve to keep the nitrogen pressure at 0.2kgf/cm
Select an appropriate position to add nitrogen.
Make sure that the nitrogen passes the welding spot.
If there is a long distance between the position of adding nitrogen and the welding spot, keep adding the nitrogen for a
while until oxygen at the welding spot is completely removed.
After welding is completed, continue adding nitrogen until the pipe becomes cool.
Perform welding downwards or horizontally from either side.
Welding
Refrigerant
position
piping
Oxygen
Processing method
1. Hand bending processing: Applicable to thin copper pipes
(ф6.35mm-ф12.7mm).
2. Mechanical bending processing: Wider application
(ф6.35-ф28.6mm), using a spring pipe bender, manual pipe bender
or electric pipe bender.
during welding.
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Pipe interface fittings
for nitrogen filling
Nitrogen
.
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Pressure relief valve
Manual valve
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Installation
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