1-12-1-1-14
1
7. LEAK TEST AND EVACUATION
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 {5 kgf/cm²G} and then leave it for 5 minutes to ensure that
the pressure does not drop.
(2) Pressurize to 1.5MPa {15 kgf/cm²G} 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-flow prevention device) to vacuum through the 3-way
valve service port to achieve the pressure below -101kPa {–755 mmHg, 5 Torr}.
Air and moisture remaining in the refrigerant system due to poor vacuum drying can
cause performance decrement and malfunction of the compressor.
8. REGARDING REFRIGERANT FILLING
Precautions during refrigerant filling
Ensure to fill only with liquid refrigerant when refilling.
If gas refrigerant is filled, the refrigerant composition will not be
balanced and will cause abnormal operation.
Liquid refrigerant
Siphon tube
Cylinder with
a siphon tube
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.)
Liquid refrigerant
Gas refrigerant
Cylinder Cylinder
Possible
Not possible
Use tools that are designed specifically for R32, for pressure resistance and to prevent mixing impurities.
Fill the refrigerant from the 3-way valve’s service port on the liquid tube.
For filling and replacing all refrigerant
(For refilling due to a leak)
For refilling refrigerant, first collect all residual refrigerant and after vacuum dehydration using the vacuum pump. Refill the refrigerant according to the
prescribed amount stated on the placard affixed to this unit.
Precautions after the tubes’ connection have completed
Ensure to open the 3-way valve after completing the tubing installation, leak test and vacuuming. If it is closed during operation, it can lead to compressor failure.
Charging with refrigerant
* For single combination
At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent tube length of 30m. If the equivalent tube length used will
be 30m or less, no additional charging will be necessary.
If the equivalent tube length will be between 30 and 50/85m, charge with additional refrigerant according to the equivalent length given in the table below.
Pump down operation
Please see Section 2 “2-12. Caution for Pump Down” on page 2-15.
It is also indicated on the label affixed to the outdoor unit.
R32
Use nitrogen gas for the leak tightness test.
Using flammable gas can cause an explosion.
Nitrogen
Refrigerant
meter
Pressure
meter
Outdoor unit
Indoor unit
3-way
valve
Vacuum
pump
For other combinations: Please refer to “9. TWIN, TRIPLE AND DOUBLE TWIN TYPE CONNECTIONS”
Additional charging amount Equivalent length Minimum length
U-200PZH2E8 60
g
/m 90 m 5 m
U-250PZH2E8 80
g
/m 60 m 5 m
SM830276-00_欧州向け R32シングル TD＆SM.indb 14 2019/02/27 11:54:29
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