Mitsubishi FDTC25VD Spezifikationen PDF herunterladen (Seite 108)

107

'10 • SR-T-091

Take care so that installed pipes may not touch

components within a unit.

If touching with an internal component

, it will generate abnormal sounds and/or vibrations.

4) On-site piping work

IMPORTANT

How to remove the side cover

●

Carry out the on site piping work with the operation valve fully closed.

●

Give sufficient protection to a pipe end (compressed and blazed, or with an adhesive tape) so

that water or foreign matters may not enter the piping.

●

Bend a pipe to a radius as large as practical.(R100~R150) Do not bend a pipe repeatedly to correct

its form.

●

Flare connection is used between the unit and refrigerant pipe. Flare a pipe after engaging a

flare nut onto it. Flare dimensions for R410A are different from those for conventional R407C.

Although we recommend the use of flaring tools designed specifically for R410A, conventional

flaring tools can also be used by adjusting the measurement of protrusion B with a protrusion

control gauge.

●

Tighten a flare joint securely with a double spanner.

Please remove the screw of a side cover and remove to the front.

Flared pipe end : A (mm)

Ǿ6.35

Ǿ12.7

Copper

pipe outer

diameter

ー0．4

Ａ

9．1

16.6

Copper pipe protrusion for flaring : B (mm)

Ǿ6.35

Ǿ12.7

Copper

pipe outer

diameter

In the case of a rigid (clutch) type

With an R410A tool With a conventional tool

0∼0.5 1.0∼1.5

CAUTION

Do not apply force beyond proper fastening torque in tightening the flare nut.

Fix both liquid and gas operation valves at the valve main bodies as illustrated on the right, and then fasten them,

applying appropriate fastening torque.

Tightening angle (° )

Tightening torque (N㨯m)

Ǿ6.35 (1/4")

Ǿ12.7 (1/2")

14∼18

49∼61

45∼60

30∼45

150

250

Recommended length of a tool handle (mm)Operation valve size (mm)

Use a torque wrench. If a torque wrench is

not available, fasten the flare nut manually

first and then tighten it further, using the

left table as a guide.

Do not hold the valve cap area with a spanner.

5) Air tightness test

Screw

Side cover

3) Refrigerant pipe wall thickness and material

●

Select refrigerant pipes of the table shown on the right wall thickness and material as specified for each pipe size.

Pipe diameter [mm]

Minimum pipe wall thickness [mm]

Pipe material*

6.35

0.8

O-type pipe

12.7

0.8

O-type pipe

*Phosphorus deoxidized seamless copper pipe ICS 23.040.15, ICS 77.150.30

NOTE

●

Select pipes having a wall thickness larger than the specified minimum pipe thickness.

2. REFRIGERANT PIPING WORK

1) Restrictions on unit installation and use

●

Check the following points in light of the indoor unit specifications and the installation site.

●

Observe the following restrictions on unit installation and use. Improper installation can result in a compressor failure or performance degradation

2) Determination of pipe size

●

Determine refrigerant pipe size pursuant to the following guidelines based on the

indoor unit specifications.

30m or less

20m or less

Gas pipe

Liquid pipe

Ǿ12.7 Ǿ6.35

Flare Flare

Ǿ12.7 Ǿ6.35

Outdoor unit

Indoor unit

CAUTION

●

The use restrictions appearing in the table above are applicable to the standard pipe size combinations shown in the table below.

Where an existing pipe system is utilized, different one-way pipe length restrictions should apply depending on its pipe size.

For more information, please see “

5. UTILIZATION OF EXISTING PIPING.

”

Restrictions

Dimensional restrictions

Marks appearing in the drawing on the right

Main pipe length

When the outdoor unit is positioned higher,

When the outdoor unit is positioned lower,

Elevation difference between

indoor and outdoor units

Outdoor unit connected

Refrigerant piping (branch pipeL)

Indoor unit connected

Plug the end of the pipe with tape, or other

material, and fill the pipe with nitrogen gas.

Only use nitrogen gas (N

)

Taping

＜N

2＞

Nitrogen

Brazing

Station valve

Primary side Secondary side

0.5MPa

Hand

Relief valve

Nitrogen

gas

Brazing must be performed under a nitrogen gas flow.

Without nitrogen gas, a large quantity of foreign matters (oxidized film) are created,

causing a critical failure from capillary tube or expansion valve clogging.

About brazing

When pipe is brazing.

Model 40, 50, 60

1 2 ... 103 104 105 106 107 108 109 110 111

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