installing the unit
REFRIGERANT PIPING WORKS
Keeping refrigerant pipe clean and dry
To prevent foreign materials or water from entering the pipe, it is important to keep the refrigerant
pipe clean and dry and to seal it during installation.
Brazing the pipe
• Make sure that there is no moisture inside the pipe.
• Make sure that there are no foreign materials and impurities in the pipe.
• Make sure that there is no leak.
• Make sure to follow the instruction when brazing the pipe.
The use of Nitrogen gas
1. Use Nitrogen gas when brazing the pipes as shown
in the picture.
2. If you do not use Nitrogen gas when brazing the
pipes, oxide may form inside the pipe. It can cause
the damage of the compressor, valves.
3. Adjust the flow rate of the Nitrogen gas with a
pressure regulator to maintain 0.05m
3
/h(1.77ft
3
/h) or
less.
Direction of the pipe when brazing
• Performing the brazing of the pipe should be headed downward or horizontally.
Exposure place Exposure time Sealing type
Outside exposure
Longer than one month Pipe pinch
Shorter than one month Taping
Inside exposure
- Taping
Brazing part
Nitrogen gas
1/4˝ copper pipe
Stop valve
Taping
Pressure regulator
Flowmeter
Downward Side Upward
Note
Avoid brazing the pipe upward.
DVM PLUS3_IM_E_31180-1.indd 20 2009-10-16 ｿﾀﾈﾄ 2:10:21
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