14
Refrigerant piping & refrigerant charge
PMML0317A rev.1 - 11/2013
13 REFRIGERANT PIPING & REFRIGERANT CHARGE
13.1 PIPING MATERIALS
1 Prepare locally-supplied copper pipes.
2 Select the piping size with the correct thickness and correct
material which can have sufcient pressure strength.
3 Select clean copper pipes. Make sure there is no dust and
moisture inside. Blow the inside of the pipes with oxygen free
nitrogen to remove any dust and foreign materials before con-
necting pipes.
N O T E
• A system with no moisture or oil contamination will give maxi-
mum performance and lifecycle compared to that of a poorly
prepared system. Take particular care to ensure all copper
piping is clean and dry internally.
• There is no refrigerant in the cycle of the indoor unit.
C A U T I O N
• Cap the end of the pipe when pipe is to be inserted through
a hole.
• Do not put pipes on the ground directly without a cap or vinyl
tape at the end of the pipe
• If piping installation is not completed until next day or over
a longer period of time, braze off the ends of the piping and
charge with oxygen free nitrogen through a Schrader valve
type access tting to prevent moisture and particle contami-
nation.
• Do not use insulation material that contains NH3 because it
can damage cooper pipe material and can be a source of fu-
ture leakage.
• Completely insulate both refrigerant gas piping and liquid pip-
ing between the indoor unit(s) and the outdoor unit.
• If not insulated, dew will ocur on the piping surface
13.2 SUSPENSION OF REFRIGERANT PIPING
Suspend the refrigerant piping at certain points and prevent the
refrigerant piping from touching the weak part of the building such
as wall, ceiling, etc…
(If touched, abnormal sound may occur due to the vibration of the
piping. Pay special attention in case of short piping length).
1~15m
Indoor unit
Fire-Proof
Section Treatment
Do not x the refrigerant piping directly with the metal ttings (The
refrigerant piping may expand and contract).
Some examples for suspension method are shown below.
For Suspending
Heavies
For piping along
the wall
For instant
installation work
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