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Refrigerant Piping Connection

Safety Precautions

• All field piping must be completed by a

licensed technician and must comply with
the local and national regulations.

• When the air conditioner is installed in a

small room, measures must be taken to
prevent the refrigerant concentration in
the room from exceeding the safety limit
in the event of refrigerant leakage. If the
refrigerant leaks and its concentration
exceeds its proper limit, hazards due to
lack of oxygen may result.

• When installing the refrigeration system,

ensure that air, dust, moisture or foreign
substances do not enter the refrigerant
circuit. Contamination in the system may
cause poor operating capacity, high
pressure in the refrigeration cycle,
explosion or injury.

• Ventilate the area immediately if there is

refrigerant leakage during the installation.
Leaked refrigerant gas is both toxic and
flammable. Ensure there is no refrigerant
leakage after completing the installation
work.

Refrigerant Piping Connection Instructions

•

The branching pipe must be installed
horizontally. An angle of more than 10°
may cause malfunction.

•

DO NOT

install the connecting pipe until

both indoor and outdoor units have been
installed.

•

Insulate both the gas and liquid piping to
prevent water leakage.

Step1: Cut pipes

When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
ensure efficient operation and minimize the
need for future maintenance.

Measure the distance between the indoor
and outdoor units.

Using a pipe cutter, cut the pipe a little
longer than the measured distance.

DO NOT

deform pipe while cutting. Be extra

careful not to damage, dent, or deform the
pipe while cutting. This will drastically reduce
the heating efficiency of the unit.

1.Make sure that the pipe is cut at a perfect 90°

angle. Refer to Fig. 7.1 for examples of bad cuts

Oblique

Rough

Warped

90°

Fig. 11.1

Step 2: Remove burrs.

Burrs can affect the air-tight seal of refrigerant
piping connection. They must be completely
removed.

1. Hold the pipe at a downward angle to

prevent burrs from falling into the pipe.

2. Using a reamer or deburring tool, remove

all burrs from the cut section of the pipe.

Pipe

Reamer

Point down

Fig. 11.2

WARNING

CAUTION

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Step 3: Flare pipe ends

Proper flaring is essential to achieve an airtight
seal.

1. After removing burrs from cut pipe, seal

the ends with PVC tape to prevent foreign
materials from entering the pipe.

2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe.

Make sure they are facing in the right
direction, because you can’t put them on
or change their direction after flaring. See
Fig. 11.3

Flare nut

Copper pipe

Fig. 11.3

4. Remove PVC tape from ends of pipe when

ready to perform flaring work.

5. Clamp flare form on the end of the pipe.

The end of the pipe must extend beyond
the flare form.

Flare form

Pipe

Fig. 11.4

6. Place flaring tool onto the form.
7. Turn the handle of the flaring tool

clockwise until the pipe is fully flared. Flare
the pipe in accordance with the dimensions
shown in table 11.1.

Table 11.1: PIPING EXTENSION BEYOND

FLARE FORM

8. Remove the flaring tool and flare form,

then inspect the end of the pipe for cracks
and even flaring.

Step 4: Connect pipes

Connect the copper pipes to the indoor unit first,
then connect it to the outdoor unit. You should
first connect the low-pressure pipe, then the
high-pressure pipe.

1. When connecting the flare nuts, apply a

thin coat of refrigeration oil to the flared
ends of the pipes.

2. Align the center of the two pipes that you

will connect.

Indoor unit tubing

Flare nut

Pipe

Fig. 11.6

3. Tighten the flare nut as tightly as possible

by hand.

4. Using a spanner, grip the nut on the unit

tubing.