Daikin FXHQ-M Especificaciones descargar pdf (Pagina 20)

EDUS39-900A-F11_a Installation

FXMQ-M 19

NOTE

The flare nuts used must be those included with the

main body.

CAUTION

Over-tightening may damage the flare and cause a refrig-

erant leakage.

Use “ Table 2 ” as a reference if a torque wrench is not avail-

able. Once work is complete, make sure there is no gas leak-

ing. As the flare nut is tightened with the wrench, the torque

will suddenly increase. From that position, tighten the nut to

the angle shown on “ Table 2 ”.

• After checking the pipe-connection for gas leakage, be

sure to insulate the liquid and gas piping, referring to the

figure below.

• Wrap the sealing pad (field supply) only around the insula-

tion for the joints on the gas piping side.

CAUTION

Be sure to insulate any field piping all the way to the piping

connection inside the unit. Any exposed piping may cause

condensation or burns if touched.

NOTE

• Attached piping is needed for connecting gas piping. Use

attached piping according to the size of the piping to be

connected.

When connecting the included piping, use the included pip-

ing flange hex bolts accessory (9) and spring washers

accessory (10).

• Connect refrigerant piping and branching according to the

attached installation manuals that come with the outdoor unit.

CAUTION

CAUTION TO BE TAKEN WHEN BRAZING REFRIGER-

ANT PIPING

Do not use flux when brazing refrigerant piping. There-

fore, use the phosphor copper brazing filler metal (BCuP-

B-Cu93P-710/795) which does not require flux.

(Flux has extremely harmful infulence on refrigerant pip-

ing sysems. For instance, if the chlorine based flux is

used, it will cause pipe corrosion or, in particular, if the flux

contains fluorine, it will damage the refrigerant oil.)

• Before brazing local refrigerant piping, nitrogen gas shall

be blown through the piping to expel air from the piping.

If your brazing is done without nitrogen gas blowing, a

large amount of oxide film develops inside the piping, and

could cause system malfunction.

• When brazing the refrigerant piping, only begin brazing

after having carried out nitrogen substitution or while

inserting nitrogen into the refrigerant piping. Once this is

done, connect the indoor unit with a flared or a flanged

connection.

• Nitrogen should be set to 2.90PSI with a pressure-reducing

valve if brazing while inserting nitrogen into the piping.

Not recommendable but in case of emergency

You must use a torque wrench but if you are obliged to

install the unit without a torque wrench, you may follow the

installation method mentioned below.

After the work is finished, make sure to check that

there is no gas leak.

When you keep on tightening the flare nut with a spanner,

there is a point where the tightening torque suddenly

increases. From that position, further tighten the flare nut

the angle shown below:

Ta b l e 2

Ester oil or ether oil.

Torque wrench

Spanner

Piping union

Flare nut

Sealing pad

(Field supply)

Insulation for fitting

(Field supply)

Gas pipe

Liquid pipe

(for gas line)

Clamp

(accessory (8))

Indoor units to be

connected

Gas piping diameter

Liquid piping

diameter

FXMQ72MVJU

φ3/4

Use attached piping.

φ3/8

FXMQ96MVJU

φ7/8

Use attached piping.

Pipe size

Further tightening

angle

Recommended arm length of

tool

φ 1/4” 60 to 90 degrees Approx. 5-7/8in.

φ 3/8” 60 to 90 degrees Approx. 7-7/8in.

φ 1/2” 30 to 60 degrees Approx. 9-13/16in.

φ 5/8” 30 to 60 degrees Approx. 11-3/16in.

Nitrogen

Refrigerant

piping

Part to be

brazed

Taping

Pressurereducing valve

hands

valve

Nitrogen

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