Leak Test And Evacuation; Regarding Refrigerant Filling - Panasonic Inverter R32 Series Technical Data & Service Manual

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6. LEAK TEST AND EVACUATION

Leak Tightness Test Method
Keep 3-way valve fully closed and pressurize through three-way valve service port.
Do not pressurize to the default value at once. Pressurize gradually.
Pressurize to 0.5MPa (5 f/cm ² G) and then leave it for 5 minutes to ensure that the pressure does not drop.
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2 Pressurize to 1.5MPa (15 f/cm ² G) and leave it for 5 minutes to ensure that the pressure does not drop.
3 For the test, pressurize to 4.15MPa and leave it for about 1 day to ensure that the pressure does not drop.
EVACUATION
Use a vacuum pump (with back-fl ow prevention device) to vacuum through the 3-way valve service port to achieve
the pressure below -101kPa (5 Torr).
Air and moisture remaining in the refrigerant system due to poor vacuum drying can cause performance decrement
and malfunction of the compressor.

7. REGARDING REFRIGERANT FILLING

Precautions during refrigerant fi lling
Ensure to fi ll only with liquid refrigerant when refi lling.
If gas refrigerant is fi lled, the refrigerant composition will not be balanced and will cause
abnormal operation.
Cylinder with
a siphon tube
Use tools that are designed specifi cally for R32, for pressure resistance and to prevent mixing impurities.
Fill the refrigerant from the 3-way valve's service port on the liquid-side.
For fi lling and replacing all refrigerant
For refi lling refrigerant, fi rst collect all residual refrigerant and after vacuum dehydration using the vacuum pump. Refi ll the refrigerant according to the prescribed amount stated
on the placard affi xed to this unit.
Precautions after the pipes' connection have completed
Ensure to open the 3-way valve after completing the piping installation, leak test and vacuuming. If it is closed during operation, it can lead to compressor failure.
Charging with refrigerant
At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent pipe length of 30m. If the equivalent pipe length used will be 30m or less,
no additional charging will be necessary.
If the equivalent pipe length will be between 30 and 50m, charge with additional refrigerant according to the equivalent length given in the table below.
For standard type
U-100/125/140P
Pump down operation
Please refer to "9. PRECAUTIONS REGARDING TEST RUN (Caution for Pump Down)" of this Installation instruction manual. It is also indicated on the label affi xed to the
outdoor unit.
Liquid refrigerant
Siphon tube
(For refi lling due to a leak)
Additional charging amount Equivalent length
45 / m
Use nitrogen gas for the leak tightness test.
Using fl ammable gas can cause an explosion.
Pressure
meter
Nitrogen Refrigerant
If using cylinders as shown in the bottom left diagram; without a siphon tube
inside, turn it upside down and use it.
(It is recommended to use the manifold with the side glass.)
Not possible
Minimum length
5 0 m 5 m
1-11-28
Outdoor unit
3-way
valve
Indoor unit
Vacuum
meter pump
Gas refrigerant
Liquid refrigerant
Possible
Cylinder
Cylinder