Daikin FXHQ-M Spezifikationen PDF herunterladen (Seite 29)

Installation EDUS39-600-F1_a

28 FXFQ-M

• Refer to Table 3 for the dimensions of flare nut spaces.

• Refer to Table 3 to determine the proper tightening torque.

Ta bl e 3

NOTE

• Apply ester oil or ether oil around the flare portions before

connecting.

• The flare nuts used must be those included with the main

body.

• Over-tightening may damage the flare and cause a refriger-

ant leakage.

Not recommended but in case of emergency

You must use a torque wrench but if not possible, 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 continue tightening the flare nut with a there is

a point where the tightening torque suddenly increases.

From that position, further tighten the flare nut the angle

shown below:

Ta bl e 4

7-3 Piping insulation

• Execute heat insulation work completely on both sides of

the gas piping and the liquid piping. Otherwise, a water

leakage can result.

• When using a heat pump, the temperature of the gas piping

can reach up to approximately 250°F, so use insulation

which is sufficiently resistant.

• in cases where the temperature and humidity of the refrig-

erant piping sections might exceed 86°F or RH80%, rein-

force the refrigerant insulation. (13/16” / 17.8 mm or

thicker) Condensation may form on the surface of the insu-

lating material.

• Check the pipe connector for gas leaks, then insulate it as

shown in the following drawing.

• Make absolutely sure to execute heat insulation works on the

pipe-connecting section after checking gas leakage by thor-

oughly studying the following figure and using the attached

heat insulating materials for fitting. Fasten both ends with the

accessory clamps.

• Wrap the sealing pad (accessory) only around the insulation

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.

7-4 Brazing refrigerant piping

• 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, con-

nect the indoor unit with a flared or a flanged connection.

• Nitrogen should be set to 2.9psi. with a pressure-reducing

valve if brazing while inserting nitrogen into the piping.

DANGER

• Use of oxygen may cause an explosion resulting in serious

injury or death. Only use nitrogen gas.

NOTE

• Do not use flux when brazing refrigerant piping. Therefore,

use the phosphor copper brazing filter metal (BCuP) which

does not require flux.

8. (Flux has an extremely negative effect on refrigerant

piping systems. For instance, if chlorine based flux is

used, it will cause pipe corrosion and damage the

refrigerant oil.

Pipe

size

Tightening

torque

(ft.lbf)

Flare

dimensions

A (in.)

Flare shape (in.)

φ 1/4” 10.4 – 12.7 0.342-0.358

φ 3/8” 24.1 – 29.4 0.504-0.520

φ 1/2” 36.5 – 44.5 0.638-0.654

φ 5/8” 45.6 – 55.6 0.760-0.776

Pipe size

Further tightening

angle

Recommended arm

length of tool (in.)

φ 1/4” (6.4 mm) 60 to 90 degrees Approx. 5 7/8

φ 3/8” (9.5 mm) 60 to 90 degrees Approx. 7 7/8

φ 1/2” (12.7 mm) 30 to 60 degrees Approx. 9 13/16

φ 5/8” (15.8 mm) 30 to 60 degrees Approx. 11 13/16

45˚

2˚

R0.016-

0.031

90˚

0.5˚

Medium sealing

pad (attached) 11)

(Wrap the piping union

with the sealing pad.)

Clamp 4)

(×4)

Insulation for

fitting (attached) 9)

(for liquid line)

Insulation for fitting

(attached) 8)

(for gas line)

Gas piping

Liquid piping

Nitrogen

Refrigerant

piping

Part to be

brazed

Taping

Pressurereducing valve

hands

valve

Nitrogen

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 37 38

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