Vacuum Purging - Panasonic S-200PE2E5 Technical Data & Service Manual

1-12. VACUUM PURGING

Leak Tightness Test Method
Keep 3-way valve fully closed and pressurize through 3-way valve service port.
Do not pressurize to the default value at once. Pressurize gradually.
1 Pressurize to 0.5MPa (5kgf/cm ² G) and then leave it for 5 minutes
to ensure that the pressure does not drop.
2 Pressurize to 1.5MPa (15kgf/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.
Vacuum Purging
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 Toor).
Air and moisture remaining in the refrigerant system due to poor
vacuum drying can cause performance decrement and malfunction
of the compressor.
1-13. 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.
Liquid refrigerant
Cylinder with
a siphon tube
Use tools that are designed specifi cally for R410A, 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 120m, charge with additional refrigerant according to the equivalent length
given in the table below.
For standard type
Model name
U 2 - 0 0 P E 2 E 8 A
U 2 - 5 0 P E 2 E 8 A
Pump down operation
Please refer to the service manual for pump down method.
Siphon tube
(For refi lling due to a leak)
Add. gas amount
5 0 / g m
8 0 / g m
1-47
Use nitrogen gas for the leak tightness test.
Using fl ammable gas can cause an explosion.
Pressure
meter
Nitrogen Refrigerant
meter
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.)
Gas refrigerant
Not possible
Possible
Cylinder
Equivalent length
1 2 0 m
1 2 0 m
Outdoor unit
3-way
valve
Indoor unit
Vacuum
pump
Liquid refrigerant
Cylinder
Minimum length
5 m
5 m
1