Bedienungsanleitung Inventor V6MCRI32-18WiFiR (Seite 20 von 148) (Deutsch, Englisch)

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Refrigerant Piping Connection Instructions

CAUTION

• 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.

For R32/R290

refrigerantmodels, the pipe connection

points must be placed outside of room.

The connection pipes can not be reused.

1. Measure the distance between the indoor

and outdoor units.

2. Using a pipe cutter, cut the pipe a little

longer than the measured distance.

CAUTION

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. 6.3 for examples of

bad cuts.

Oblique

Rough

Warped

90°

Fig. 6.3

Fig. 6.2

CAUTION

If the outdoor unit is installed higher than

the indoor unit:

-It is recommended that vertical suction

risers not be upsized. Proper oil return to

the compressor should be maintained with

suction gas velocity. If velocities drop

below7.62m/s (1500fpm (feet per minute)),

oil return will be decreased. An oil trap

should be installed every 6m(20ft) of

vertical suction line riser. (See Fig. 6.2)

The outdoor unit is installed higher than the indoor unit

 Page 21 

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 6.3.

Table 6.3: 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. 6.8

3. Tighten the ﬂare nut as tightly as possible

by hand.

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

tubing.

5. While ﬁrmly gripping the nut, use a torque

wrench to tighten the ﬂare nut according

to the torque values in table 6.3.

NOTE: Use both a spanner and a torque

wrench when connecting or disconnecting

pipes to/from the unit.

Fig. 6.9

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. 6.4

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. 6.5

Flare nut

Copper pipe

Fig. 6.5

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. 6.6

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. 6.7

Ø 9.5

Ø 12.7

Ø 15.9

18-20N.m

(183-204kgf.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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