Daikin FXDQ-SPV1, Engineering Data

FXDQ-SPV1 EDTFVN391825

30

3P347455-11H

5

(4) Tighten the nut on the upper side.

CAUTION

· 

Please use a water level or water filled polyethylene 

   pipe to confirm whether the air conditioner is installed 

   horizontally. When a polyethylene pipe is used to replace 

   a water level, please align the upper surface of the product 

   with the horizontal level of both sides of the polyethylene 

   pipe, so as to adjust the level of the product. 

(Please 

   pay special attention to note that the tilting direction 

   shall not be reversed against the water drainage 

   direction, as this will result in water leakage.)

Water level

Polyethylene pipe

6. REFRIGERANT PIPING WORK

(For the installation of the refrigerant pipe for the 

outdoor unit, please refer to the installation manual for 

the outdoor unit.)

(Heat insulation shall be carried out for the pipes on 

the air supply side and the liquid side. Otherwise water 

may leak out. Please use insulation material which can 

withstand a high temperature of over 120

o

C. 

Please base on the installation environment to reinforce 

the heat insulation for the refrigerant pipe. 

Otherwise, condensate may occur on the surface of the 

heat insulation material.)

(Before installing the refrigerant pipe, please always 

confirm that the refrigerant is R410A. In case that any 

other refrigerant is used, the air conditioner cannot work 

normally.)

The product is a special machine using new type 

refrigerant (R410A). Please always comply with the 

following items to carry out the installation work.

· 

Use special pipe cutting machine and flare tools for R410A.

· 

When connecting the flare, please apply freezing oil 

   (ester oil or ether oil) only on the inside of the flare.

· 

Always use the flare nut supplied with the air conditioner. 

   (Never use flare nut of any other type, such as Type 1 

   flare nut, otherwise the refrigerant may leak out.)

· 

To prevent dirt, dust or moisture from entering into the 

   inside of the pipe, please correct the pipe in the 

   squeezed or sealed manner.

CAUTION

CAUTION

· 

Please ensure to use refrigerant of the specified type in 

   the refrigeration cycle, and never let the air contaminate 

   the refrigerant.

· 

In case that during installation any refrigerant is leaked 

   out, the house should be ventilated for air exchange.

(1) Connect the pipe.

· 

Refrigerant has been filled in the outdoor unit.

· 

Align the connecting section of the refrigerant pipe to 

   the center of the flare section, and firstly turn 3 – 4 

   operations manually, and then tighten the pipe with the 

   specified torque. 

· 

To prevent the flare section from being broken or 

      leaking air, please tighten with a torque wrench. 

      (Please refer to Fig. 6)

· 

To prevent air leakage, please apply freezing oil 

   (ester oil or ether oil) on the inside of the flare. 

   (Please refer to Fig. 7)

· 

Please fix the flare nut to the main unit. (To prevent the 

   flare nut from aging and cracking)

· 

For the dimensions of the flare and the tightening torque, 

   please refer to Table 1. 

[Applying oil]

[Tightening]

Torque wrench

Wrench

Pipe 

connector

Flare nut

Fig. 6

Fig. 7

Never apply the freezing 

oil on the outer surface

Apply the 

freezing oil 

on the inner 

surface of 

the flare

Nut

Never let the nut in 

contact with the freezing oil, 

and avoid over-tightening

Pipe connector

Flare

Flare nut

Note : Please always align the center of the connection 

section of the refrigerant pipe with the center of the flare 

section and the flare nut.

Otherwise pipe breaking or air leakage can occur.

A

Table 1

Pipe

diameter

Tightening torque

Flare dimension 

A (mm)

Flare

Ø 6.4

(1/4”)

Ø 9.5

(3/8”)

Ø 12.7

(1/2”)

Ø 15.9

(5/8”)

14.2 - 17.2N 

•

 m

(144 - 176 kgf 

•

 cm)

32.7 - 39.9N 

•

 m

(333 - 407 kgf 

•

 cm)

49.5 - 60.3N 

•

 m

(504 - 616 kgf 

•

 cm)

61.8 - 75.4N 

•

 m

(630 - 770 kgf 

•

 cm)

8.7 - 9.1

12.8 - 13.2

16.2 - 16.6

19.3 - 19.7

R0.4-0.8

90°±2°

45°±2°

CAUTION

Over-tightening can damage the flare and result in 

refrigerant leakage. Please note not to let oil stick

to any part outside the flare. In case that any oil 

sticks to parts as resin, damage can occur.

· 

In case that a torque wrench is not available, please 

   refer to Table 2.

   When an ordinary wrench is used to tighten the flare nut, 

   the nut will suddenly become tightened in some point. 

   From such point, further tighten the nut to the angle as 

   shown in Table 2.

It is not recommended to use this method, and it can 

be used only in emergency cases.

You must use a torque wrench, but if you do not have a 

torque wrench and have to install the unit, you can follow 

the following method to install.

When you complete the work, always check whether 

any air is leaked out.

When you use a wrench to tighten the flare nut, the 

tightening torque can suddenly increase in some point. 

From such point, further tighten the flare nut to the angle 

as shown below :