ENGLISH-34
Refrigerant piping work
Insulating the refrigerant pipe
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Be sure to insulate the refrigerant pipe, joints and connections with class 'o' material.
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If you insulate the pipes, the condensed water does not fall from the pipes and the capacity of the Air to Water Heat
Pump is improved.
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Check if there are any insulation cracks on the bent pipe.
Insulation
Gas side pipe
Liquid side pipe
Indoor unit
Clamp
Insulation
Install the insulation to
be overlapped
Indoor unit
Overlapped
Brazing the Pipe
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Make sure that there is no moisture inside the pipe.
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Make sure that there are no foreign materials and impurities in the pipe.
Replacement of Nitrogen gas
1. Use oxygen free nitrogen gas when brazing the pipes as shown in the picture.
2. If you do not use Nitrogen gas when brazing the pipes, oxidation may form in the pipe. It can cause the damage of the
compressor and valves.
3. Adjust the flow rate of the replacement with a pressure regulator to maintain 0.05 m
3
/h or more.
4. Perform brazing of the service valve after protecting the valve.
Brazing part
Nitrogen gas
1/4" copper pipe
Valve stem
Taping
Pressure regulator
