Connecting The Refrigerant Piping; Selection Of Piping Material; Example Of Connection - Panasonic CU-8ME1XPK Installation Manual

Connecting the refrigerant piping

1. Installation of refrigerant piping is possible as front connection,
side connection and bottom connection.
FRONT CONNECTION
Brazing
Flare nut
BOTTOM CONNECTION
Brazing
Suction gas pipe
(attached)
Brazing
Knock out hole
(Make a hole
using a hammer
etc.)
Elbow
(part to be
procured in the
field)
SIDE CONNECTION
Brazing
Suction gas pipe
(attached)
Liquid pipe
(part to be
procured in
the field)
Discharge gas pipe
(attached)
2. Make sure to perform the piping installation within the range of
the maximum allowable pipe length, allowable level difference
and allowable length after branching as indicated in chapter

"Example of connection".

3. for installation of the refrigerant branching kit, refer to the
installation manual delivered with the kit.
4. Pipe connection
- Apply ether or ester oil around the flare portions before
connecting.
- Make sure to flow nitrogen gas through the pipe when brazing.
Flange
Suction gas pipe
(attached)
Liquid pipe
(attached)
Discharge gas pipe
(attached)
Flange
Flare nut
Liquid pipe
(part to be
procured in
the field)
Discharge gas pipe
(attached)
Flange
Flare nut
Knock out hole
(Make a hole using
a hammer etc.)
5. Protection against contamination when installing pipes
- Take measures to prevent foreign materials like moisture and
contamination from mixing into the system.
Place Installation period
Outdoor More than a month
Less than a month
Indoor Regardless of the period
- Great caution is needed when passing copper tubes through
walls.

Selection of piping material

1. Foreign materials inside pipes (including oils for fabrication)
must be 30mg/10m or less.
2. Use the following material specification for refrigerant pipping:
- construction material: Phosphoric acid deoxidized seamless
copper for refrigerant.
- size: Determine the proper size referring to chapter "Example
of connection".
- The wall thickness of the refrigerant piping should comply with
relevant local and national regulations. For R407C the design
pressure is 3.2 MPa.
3. Make sure to use the particular branches of piping that have
been selected referring to chapter "Example of connection".
Protection method
Pinch the pipe
Pinch or tape the pipe
4