Manual Inventor V5MFI32-60 (page 31 of 136) (English)

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 Page 30

Refrigerant Piping Connection

Safety Precautions

• All eld 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

ammable. 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 are them properly. This will

ensure efcient 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 efciency 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

 Page 31 

Step 3: Flare pipe ends

Proper aring 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 are 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 aring. See

Fig. 11.3

Flare nut

Copper pipe

Fig. 11.3

4. Remove PVC tape from ends of pipe when

ready to perform aring work.

5. Clamp are form on the end of the pipe.

The end of the pipe must extend beyond

the are form.

Flare form

Pipe

Fig. 11.4

6. Place aring tool onto the form.

7. Turn the handle of the aring tool

clockwise until the pipe is fully ared. Flare

the pipe in accordance with the dimensions

shown in table 11.1.

Table 11.1: PIPING EXTENSION BEYOND

FLARE FORM

8. Remove the aring tool and are form,

then inspect the end of the pipe for cracks

and even aring.

Step 4: Connect pipes

Connect the copper pipes to the indoor unit rst,

then connect it to the outdoor unit. You should

rst connect the low-pressure pipe, then the

high-pressure pipe.

1. When connecting the are nuts, apply a

thin coat of refrigeration oil to the ared

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 are nut as tightly as possible

by hand.

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

tubing.

5. While rmly gripping the nut, use a torque

wrench to tighten the are nut according

to the torque values in table 11.1.

NOTE: Use both a spanner and a torque

wrench when connecting or disconnecting

pipes to/from the unit.

Pipe

gauge

Tightening

torque Flare dimension (A)

(Unit: mm/Inch) Flare shape

Min. Max.

Ø 6.4

R0.4~0.8

45°±2

90 °

±4

Fig. 11.5

Ø 9.5

Ø 12.7

Ø 15.9

Ø 19.1

Ø 22

65-67 N.m

(663-683 kgf.cm) 23.2/0.91 23.7/0.93

75-85N.m

(765-867 kgf.cm) 26.4/1.04 26.9/1.06

18-20 N.m

(183-204 kgf.cm) 8.4/0.33 8.7/0.34

25-26 N.m

(255-265 kgf.cm) 13.2/0.52 13.5/0.53

35-36 N.m

(357-367 kgf.cm) 16.2/0.64 16.5/0.65

45-47 N.m

(459-480 kgf.cm) 19.2/0.76 19.7/0.78

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