Indoor Unit Installation; Refrigerant Piping Work - Daikin FDYB-KA Series Engineering Data

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Table of Contents

ED41-016B

15.1.4 Indoor Unit Installation

• While installing unit, take care that dust etc. should not drop into the drainpan.

Install the indoor unit temporarily.

• Attach the hanger bracket to the suspension bolt. Be sure to fix it securely by using a nut and

washer

from the upper and lower sides of the hanger bracket.

Make sure the unit is level.

• Level the unit with a level when installing. If the unit is not level, it could become the source of

water leaks.

• Check if the unit is leveled at all four corners with a water level or a water-filled vinyl tube as

shown in the drawing.

Tighten the upper nut.

Be sure to completely insulate the duct to be connected (field supplied) and the connecting joint

on the main unit body

15.1.5 Refrigerant Piping Work

〈 For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit. 〉

〈 Execute heat insulation work completely on both sides of the gas piping and the liquid piping. Otherwise, a water leakage can result sometimes. 〉

WARNING

Do not allow air or other substances other than the designated refrigerant to get mixed into the freezing cycle.

Ventilate the room if refrigerant gas leaks.

• Use copper alloy seamless pipes. (lSO 1337)

• The outdoor unit is charged with refrigerent.

• Be sure to use both a spanner and torque wrench together, as shown in the drawing, when connecting or disconnecting pipes to/from the unit. (Fig. 7)

• Refer to Table 1 for the dimensions of flare nut spaces.

• When connecting the flare nut, coat the flare both inside and outside with refrigerating machine oil and initially tighten by hand 3 or 4 turns before

tightening firmly. (Fig. 8)

• Refer to Table 1 to determine the proper tightening torque.

(Overtightening may damage the flare and cause leaks.)

• Avoid the mixture into a refrigerating cycle of any air and whatnot except the designated refrigerant.

• Make absolutely sure to execute heat insulation works on the pipe-connecting section after checking gas leakage by thoroughly studying the following

figure and using the attached heat insulating materials for couplings

• Wrap only the gas line side of the insulation for fitting (union) with the sealing pad

• Carry out sufficient ventilation if the refrigerant gas leaks during installation work.

• Insulate connecting piping completely. While heating the highest temperature of gas piping became 120°C.

Use the insulator that the highest temperature can be resisted.

Torque wrench

Spanner

Piping union

Flare nut

Fig. 7

Table 1

Pipe gauge

Tightening torque

1420 – 1720 N · cm

φ6.4

(144 – 176 kgf · cm)

3270 – 3990 N · cm

φ9.5

(333 – 407 kgf · cm)

4950 – 6030 N · cm

φ12.7

(504 – 616 kgf · cm)

6180 – 7540 N · cm

φ15.9

(630 – 770 kgf · cm)

For reference

If a torque wrench is not available, use the following method as a rule of thumb.

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:

Table

Pipe size

φ6.4 (1/4")

φ9.5 (3/8")

φ12.7 (1/2")

φ15.9 (5/8")

FDYB-KA Series

Coat here with

refrigerating machine oil.

Fig. 8

Flare dimensions A (mm)