7. Refrigerant Piping Work
•
The pressure for this product is 4.15MPa. The pressure required for refrigerant R410A is 1.4 times
higher than the refrigerant R22. Therefore, the refrigerant pipes for R410A must be thicker
than that
for R22. Make sure to use specified refrigerant pipes. Otherwise, the refrigerant pipes
may rupture
due to an excessive refrigerant pressure. Pay close attention to the pipes thickness when using
copper refrigerant pipes. The thickness of copper refrigerant pipes differs depending on its
material.
•
Check to ensure that no pressure exists inside the stop valve before removing the closing pipe
(piping cap).
•
Ensure that the corresponding pipe connections for the liquid, low pressure gas and high/low
pressure
gas
piping
are
properly
connected
to
the
equipment,
as
specifie
d
in
the
installation
instructions.
•
When handling the refrigerant, be sure to wear leather gloves to prevent injuries.
Cautions for Refrigerant Pipe Ends
7.1 Piping Materials
(1) Obtain locally-supplied copper pipes.
(2) Use copper pipe for refrigerant piping.
(3) Pay close attention to pipe thickness.
(4) Use clean copper pipes. Make sure there is no dust or moisture inside the pipes.
Do not use any tools which produce a lot of metal shavings such as a saw or a grinder.
(5) Take special care to prevent contamination or moisture settling on interior pipe surfaces during piping
work.
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct
Correct
Incorrect
Incorrect
Correct
Incorrect
Hole
Hole
Attach a cap
or vinyl tape.
Attach a cap
or vinyl tape.
Attach a cap
or vinyl bag with
rubber band.
Do not place the pipe
directly on the ground.
Rain water
can enter.
22
Summary of Contents for AVWW-114FKFW
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