Panasonic Inverter R32 Series - Leak Test and Evacuation; Regarding Refrigerant Filling

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1-11-28

2. SELECTING THE INSTALLATION SITE

2-1. Indoor Unit

AVOID:

● areas where leakage of flammable gas may be expected.

● places where large amounts of oil mist exist.

● direct sunlight.

● locations near heat sources which may affect the

performance of the unit.

● locations where external air may enter the room directly.

This may cause “condensation” on the air discharge ports,

causing them to spray or drip water.

● locations where the remote controller will be splashed with

water or affected by dampness or humidity.

● installing the remote controller behind curtains or furniture.

● locations where high-frequency emissions are generated.

DO:

● select an appropriate position from which every corner of the

room can be uniformly cooled.

● select a location where the ceiling is strong enough to

support the weight of the unit.

● select a location where tubing and drain pipe have the

shortest run to the outdoor unit.

● allow room for operation and maintenance as well as

unrestricted air flow around the unit.

● the limitation of the tubing length between the indoor and

the outdoor units should be referred to the Installation

Instructions of the outdoor unit.

● allow room for mounting the remote controller about 1 m off

the floor, in an area that is not in direct sunlight or in the flow

of cool air from the indoor unit.

4-Way Cassette Type

Wall

indoor unit indoor unit

min. 1 m

Over 2.5 m

min. 3 m

Obstacles

Ceiling

1 m

281258_EU.indb 7 2016-9-1 13:03:39

6. LEAK TEST AND EVACUATION

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.

1 Pressurize to 0.5MPa (5

f/cm

G) and then leave it for 5 minutes to ensure that the pressure does not drop.

2 Pressurize to 1.5MPa (15

f/cm

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.

R 3 2

Outdoor unit

3-way

valve

Indoor unit

Use nitrogen gas for the leak tightness test.

Using ﬂ ammable gas can cause an explosion.

Pressure

meter

Nitrogen Refrigerant

meter

Vacuum

pump

Leak Tightness Test Method

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.

Charging with refrigerant

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 reﬁ lling due to a leak)

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.

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

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.

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

Liquid refrigerant

Siphon tube

7. REGARDING REFRIGERANT FILLING

Precautions during refrigerant ﬁ lling

If using cylinders as shown in the bottom left diagram; without a siphon tube

inside, turn it upside down and use it.