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PMML0140A rev.1 - 07/2009
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 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
connecting pipes.
4. After connecting the refrigerant piping, seal the open space
between Knockout hole and refrigerant pipes by using
insulation material as shown bellow:
NOTE:
A system with no moisture or oil contamination will give -
maximum performance and life cycle 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. -
CAUTION:
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
contamination.
Do not use insulation material that contents NH3 because -
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 units and the RASC unit.
If not insulated, dew will occur on the piping surface. -
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
Indoor unit
Fire-Proof sectrion
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 suspension
Heavies
For Piping along
the wall
For Instant
Installation work
Insulation material
Field Supplied refrigerant pipe
Insulation material
Insulation material
Unit side
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