2.8. New refrigerant Series [R407C]
pipe installation
2.8.1. Procedure
•
• •
• The new refrigerant (R407C) has a different composition to
the previously-used refrigerant (R22), so some contents
and method of pipe installation and charging work are
different from before. Care should be taken when carrying
out this work.
2.8.2. Installation and precautions
2.8.2.1. Before installation
1. Determine the installation division.
2. Check the refrigerant to be used.
•
• •
• Check that the refrigerant is R407C.
•
• •
• Check that the gauge pressure is at a maximum of 3.3
MPa.
3. Make a drawing of the Installation.
2.8.2.2. Installation
1. Install the sleeve and the insert.
2. Install the indoor unit.
3. Install the refrigerant piping.
•
• •
• Pipe materials (Phosphours Deoxidization Seamless
Pipe)
•
• •
• Refrigerant pipes which were previously used to carry
R22 must not be re-used. If replacing the indoor and
outdoor units, be sure to replace all refrigerant pipes
also.
•
• •
• Check the pipe thickness.
(1/4, 3/8, 1/2 : t = 0.8mm 5/8, 3/4 : t = 1.0mm)
•
• •
• Clean the inside of the pipes.
•
• •
• When storing pipes, seal both ends of the pipes and
store them indoors to prevent water, dust and other
foreign particles from getting inside.
•
• •
• Take care not to let any foreign particles (oxide scales,
water or dirt) get inside the refrigerant lines (same as for
R22).
■
Refrigerant pipe storing
Location Installation period Storing method
Outdoors 1 month or more Pinching
Less than 1 month Pinching or taping
Indoors Any
•
• •
• Pinching method
Close off the ends of the pipes with pliers or similar tool
and seal the opening by brazing.
•
• •
• Taping method
Wind PVC tape around the ends of the pipes to seal the
2.7. Group Control Equipment
7
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