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REFRIGERANT PIPING &
REFRIGERANT CHARGE
11 REFRIGERANT PIPING & REFRIGERANT CHARGE
11.1. PIPING MATERIALS
1. Prepare locally-supplied copper pipes.
2. Select the piping size with the correct thickness and
correct material which can have sufficient 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 connecting pipes.
NOTE:
A system with no moisture or oil contamination will give
maximum 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.
11.2. 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
Indor unit
PMML138A_R1-eng-fre.indb 25
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 fitting to prevent moisture and particle
contamination.
Do not use insulation material that contains NH3 because
it can damage cooper pipe material and can be a source of
future leakage.
Completely insulate both refrigerant gas piping and liquid
piping between the indoor unit(s) and the outdoor unit.
If not insulated, dew will ocur on the piping surface
For Suspending
Heavies
Fire-Proof
Section Treatment
CAUTION:
Do not fix the refrigerant piping directly with the metal
fittings (The refrigerant piping may expand and contract).
Some examples for suspension method are shown
below.
For piping along
the wall
PMML0138A-rev.1 - 11/2009
For instant
installation work
25
19/11/2009 14:45:14
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