Piping Materials - Hisense AVWW-28UCSA Installation & Maintenance Manual

5. Refrigerant Piping Work
Use refrigerant R410A in the refrigerant cycle.
Do not charge oxygen, acetylene or other
flammable and poisonous gases into the
refrigerant cycle when performing a leakage
test or an air-tight test. These types of gases
are extremely dangerous and can cause an
explosion. It is recommended that
compressed air, nitrogen or refrigerant be
used for these types of tests.
5.1

Piping Materials

(1) Prepare locally-supplied copper pipes.
(2) Select the piping size from the Table 5.1.
(3) Select clean copper pipes. Make sure
there is no dust and moisture inside of the
pipes. Blow the inside of the pipes with
nitrogen or dry air, to remove any dust or
foreign materials before connecting pipes.
NOTE
G Cautions for Refrigerant Pipe Ends
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Incorrect
Correct
Hole Hole
Attach a cap
or vinyl tape.
Correct Incorrect
Rain water can
enter.
Attach a cap
or vinyl bag with
rubber band.
G Cap the end of the pipe when the pipe is to
be inserted through a hole.
G Do not put pipes on the ground directly
without a cap or vinyl tape at the end of the
pipe.
Do not place the pipe
directly on the ground.
Correct Incorrect
Attach a cap
or vinyl tape.
G Flaring Dimension
Perform the flaring work as shown below.
G Piping Thickness and Material
Use the pipe as below.
Diameter
Thickness
Material is based on a JIS standard (JIS B8607).
G Flare Nut Dimension
Use the flare nut as below.
<Flare Nut Dimension B (mm)
Diameter R410A
Dimension is based on a JIS standard
(JIS B8607).
G Water Pipe Connection of Plate Heat Exchanger
Thread of Water Pipe Connection on Plate
Heat Exchanger
Diameter
Material
Flare Nut
UNI ISO 228/1-G1 B
（１" ）
GAS
Φ２３
Φ３３．７