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8

Refrigerant Piping Work

WARNING

• Do not apply mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would reduce the service life of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Never install a dryer to this R410A unit in order to guarantee its service life.
• The drying material may dissolve and damage the system.
• Incomplete flaring may result in refrigerant gas leakage.

1.

Flaring the pipe end 

1) Cut the pipe end with a pipe cutter.

2) Remove burrs with the cut surface facing downward 

so that the filings do not enter the pipe.

3) Put the flare nut on the pipe.

4) Flare the pipe.

5) Check that the flaring has been done correctly.

2.

Refrigerant piping

CAUTION

• Use the flare nut fixed to the main unit. (This is to prevent the flare nut from cracking as a result of deterioration over time.)

• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)

• Use a torque wrench when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.

• Align the centers of both flares and tighten the flare nuts 3 or 4 turns by hand, then tighten them fully with a spanner and a torque wrench.

2-1. Caution on piping handling 

• Protect the open end of the pipe against dust and moisture.

• All pipe bends should be as gentle as possible. Use a pipe bender for 

bending. 

2-2. Selection of copper and heat insulation materials

When using commercial copper pipes and fittings, observe the following: 

• Insulation material: Polyethylene foam

Heat transfer rate: 0.041 to 0.052W/mK (0.024 to 0.030Btu/fth°F (0.035 to 
0.045kcal/mh°C))
Be sure to use insulation that is designed for use with HVAC Systems. 

• ACR Copper only.

• Be sure to insulate both the gas and liquid piping and observe the insulation dimensions as below. 

• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.

Piping size

Minimum bend radius

Piping thickness

Thermal insulation size

Thermal insulation 

thickness

Gas side

O.D. 5/8 inch

(15.9mm)

1-15/16 inch (50mm)

or more

0.039 inch (1.0mm)

(C1220T-O)

I.D. 5/8-13/16 inch

(16-20mm)

13/32 inch

(10mm) Min.

Liquid side

O.D. 1/4 inch

(6.4mm)

1-3/16 inch (30mm)

or more

0.031 inch (0.8mm)

(C1220T-O)

I.D. 5/16-13/32 inch

(8-10mm)

A

A

Flaring

Set exactly at the position shown below.

Die

0-0.020 inch

(0-0.5mm)

Clutch-type

Flare tool for 

R410A

0.039-0.059 inch

(1.0-1.5mm)

Clutch-type

(Rigid-type)

0.059-0.079 inch

(1.5-2.0mm)

Wing-nut type

(Imperial-type)

Conventional flare tool

The flare’s inner surface must be 

flaw-free.

The pipe end must be evenly flared 

in a perfect circle.

Make sure that the flare nut is fitted.

Check

Cut exactly at 

right angles.

 Remove burrs.

Do not apply refrigeration 

oil to the outer surface.

Flare nut

Apply refrigeration 

oil only to the inner 

surface of the flare.

Do not apply refrigeration 

oil to the flare nut to avoid 

tightening with excessive 

torque.

Apply oil

Torque wrench

Piping union

Flare nut

Spanner

Tighten

Piping size

O.D. 5/8 inch

(15.9mm)

Gas side

Liquid side

O.D. 1/4 inch

(6.4mm)

Flare nut tightening 

torque

45-5/8–55-5/8ft • lbf

(61.8-75.4N • m)

10-1/2–12-3/4ft • lbf

(14.2-17.2N • m)

Wall

If no flare cap is 

available, cover the 

flare mouth with 

tape to keep dirt 

and water out.

Rain

Be sure to 

place a cap.

Gas pipe

Liquid pipe

Gas pipe 

insulation

Liquid pipe 

insulation

Finishing tape Drain hose

01_EN_3P457790-1.fm  Page 8  Thursday, December 1, 2016  3:51 PM

Summary of Contents for FTX30NVJU

Page 1: ...INSTALLATION MANUAL DAIKIN ROOM AIR CONDITIONER R410A Split Series English Français Español MODELS FTX30NVJU FTX36NVJU Installation manual Manuel d installation Manual de instalación ...

Page 2: ...leak throughout the system Do not install unit in an area where flammable materials are present due to risk of explosions that can cause serious injury or death Safely dispose all packing and transportation materials in accordance with federal state local laws or ordinances Packing materials such as nails and other metal or wood parts including plastic packing materials used for transportation may...

Page 3: ...nted from getting into the system b Tight R410A does not contain any chlorine does not destroy the ozone layer and does not reduce the earth s protection again harmful ultraviolet radiation R410A can contribute to the greenhouse effect if it is released Therefore take proper measures to check for the tightness of the refrigerant piping installation Read the chapter Refrigerant Piping Work and foll...

Page 4: ...quipment is nearby 2 Wireless remote controller 1 Turn on all the fluorescent lamps in the room if any and find a location where the remote controller signals are properly received by the indoor unit within 23ft 7m 2 Configure the jumper Configure according to the type of unit heat pump or cooling only the user purchased The default setting is heat pump For heat pump outdoor unit model RX No chang...

Page 5: ...ters The service lid is removable Opening method 1 Remove the service lid screws 2 Pull out the service lid diagonally down in the direction of the arrow 3 Pull down Service lid Bottom of indoor unit Front grille fixture Screw covers 3 J Remote controller holder fixing screws M3 13 16 M3 20mm 2 F C Titanium apatite photocatalytic air purifying filter 3 Titanium apatite photocatalytic air purifying...

Page 6: ...using the markings at the top of the indoor unit as a guide 4 Open the front panel then open the service lid Refer to Service lid on page 4 5 Pass the inter unit wire from the outdoor unit through the feed through wall hole and then through the back of the indoor unit Pull them through the front side Bend the ends of tie wires upward for easier work in advance If the inter unit wire ends are to be...

Page 7: ...c shock or fire Do not use locally purchased electrical parts inside the product Do not branch the power for the drain pump etc from the terminal block Doing so may cause electric shock or fire Do not connect the power wire to the indoor unit Doing so may cause electric shock or fire 3 Switch around the drain hose and drain plug 1 Remove the fixing screw and pull out the drain hose How to switch a...

Page 8: ... embedded drain piping is required use appropriate parts that match the hose front end Figure of hose front end When drain hose requires extension obtain an extension hose with an inner diameter of 5 8 inch 16mm Be sure to thermally insulate the indoor section of the extension hose When connecting a rigid polyvinyl chloride pipe nominal diameter 1 2 inch 13mm directly to the drain hose attached to...

Page 9: ...thylene foam Heat transfer rate 0 041 to 0 052W mK 0 024 to 0 030Btu fth F 0 035 to 0 045kcal mh C Be sure to use insulation that is designed for use with HVAC Systems ACR Copper only Be sure to insulate both the gas and liquid piping and observe the insulation dimensions as below Use separate thermal insulation pipes for gas and liquid refrigerant pipes Piping size Minimum bend radius Piping thic...

Page 10: ...hen mount the front panel 3 How to set the different addresses When 2 indoor units are installed in one room the 2 wireless remote controllers can be set for different addresses Change the address setting of one of the 2 units When cutting the jumper be careful not to damage any of the surrounding parts 1 Remove the front grille 6 screws 3 front grille fixtures 2 Remove the metal plate electrical ...

Page 11: ... breaker to eliminate unnecessary power consumption If the circuit breaker trips to shut off the power to the air conditioner the system will restore the original operation mode when the circuit breaker is opened again 2 Test items Test items Symptom Check Indoor and outdoor units are installed securely Fall vibration noise No refrigerant gas leaks Incomplete cooling heating function Refrigerant g...

Page 12: ... 1611 HT M16B117 The two dimensional bar code is a manufacturing code 3P457790 1 ...

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