Hitachi RAS-6HVRNM2 - Piping Materials and Preparation; Piping Connection Procedures

2-96
TC-12001
OUTDOOR UNIT
20
P5414950-rev.1
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Notice for Refrigerant Pipe Ends
6.1 Piping Materials
(1) Prepare locally-supplied copper pipes.
(2) Select the piping size from the Table 6.1 and Table 6.2.
(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. Do not use any tools which produce a lot of swarf such as a saw or a grinder.
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Cautions for Piping Connection Work
(1) Connect the indoor/outdoor units with refrigerant pipes. Fix the pipes and pay attention not to contact
with weak materials such as ceiling. (Otherwise, abnormal sound may be heard due to the vibration of
the piping.)
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[Ethereal Oil FVC50K (3HP), FVC68D (4-7HP) (Idemitsu Kousan Co. Ltd.)]
(3) In case that temperature and humidity inside the ceiling exceed 27
o
C/RH80%, apply additional
insulation (approx. 10mm thickness) to the accessory insulation. It prevents dew condensation on the
surface of the insulation (refrigerant pipe only).
(4) Perform the air-tight test (4.15MPa for the test pressure).
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Also insulate all the refrigerant pipes.
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Cap the end of the pipe when the pipe is to be inserted through a hole.
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Do not put pipes on the ground directly without a cap or vinyl tape at the end of the pipe.
NOTICE
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct
CorrectIncorrect Incorrect
Correct Incorrect
HoleHole
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.
A
pply Refrigerant Oil.
Two Spanners Work Tightening Work for Stop Valve (Liquid)
Do not apply the two spanners work here.
Refrigerant leakage shall occur.