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English

7

En

gl

is

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2.

Refrigerant piping

CAUTION

• Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
• Use torque wrenches 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 the torque 
wrenches.

2-1. Caution on piping handling 

1) Protect the open end of the pipe against dust and moisture.
2) 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:

1) 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))
Refrigerant gas pipe’s surface temperature reaches 230°F (110°C) max.
Choose heat insulation materials that will withstand this temperature.

2) Be sure to insulate both the gas and liquid piping and to provide insulation 

dimensions as below.

3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.

Gas side

Liquid side

Gas pipe thermal 

insulation

Liquid pipe thermal 

insulation

O.D. 1/2 inch (12.7mm)

O.D. 1/4 inch (6.4mm)

I.D. 0.551-0.630 inch 

(14-16mm)

I.D. 0.315-0.393 inch 

(8-10mm)

Minimum bend radius

Thickness 0.393 inch (10mm) Min.

1-9/16 inch (40mm) or more 1-3/16 inch (30mm) or more

Thickness 0.031 inch (0.8mm) (C1220T-O)

Do not apply refrigeration 

oil to the outer surface.

Flare nut

Apply refrigeration oil to 

the inner surface of the 

flare.

Do not apply refrigeration 

oil to the flare nut avoid 

tightening with over torque.

[Apply oil]

Torque wrench

Piping union

Flare nut

Spanner

[Tighten]

Flare nut tightening torque

Gas side

Liquid side

1/4 inch (6.4mm)

36.5-44.5ft • lbf

(49.5-60.3N • m)

10.4-12.7ft 

l

 lbf

(14.2-17.2N 

l

 m)

1/2 inch (12.7 mm)

Wall

If no flare cap is 
available, cover 
the flare mouth 
with tape to keep 
dirt or water out.

Be sure to 
place a cap.

Rain

Gas pipe

Liquid pipe

Gas pipe 
insulation

Liquid pipe 
insulation

Finishing tape

Drain hose

Inter-unit wire

01_EN_3P276866-2D.fm  Page 7  Friday, February 18, 2011  4:07 PM

Summary of Contents for FTXN15KVJU

Page 1: ...TION MANUAL DAIKIN ROOM AIR CONDITIONER English Français Español Installation manual Manuel d installation Manual de instalación MODELS FTXN15KVJU FTXN18KVJU FTXN24KVJU 00_CV_3P276866 2D fm Page 1 Friday February 18 2011 4 21 PM ...

Page 2: ...tning rods because lightning strikes could cause a severe shock hazard resulting in severe injury or death and to gas pipes because a gas leak could result in an explosion which could lead to severe injury or death WARNING Installation should be left to the authorized dealer or another trained professional Improper installation may cause water leakage electrical shock fire or equipment damage Inst...

Page 3: ...mp down air will be sucked in when the compressor is run causing abnormally high pressure which could lead to equipment damage and personal injury Be sure to install a ground fault circuit interrupter breaker Failure to install a ground fault circuit interrupter breaker may result in electrically shocks or fire personal injury CAUTION Do not install the air conditioner where gas leakage would be e...

Page 4: ...e type of unit purchased by the customer The default settings are on the heat pump side For cooling only Outdoor unit model RKN Set the DIP switch on the cooling only side For heat pump Outdoor unit model RXN Check that the DIP switch are on the heat pump side If they are set on the cooling only side move them to the heat pump side DIP switch Heat pump Cooling only DIP switch Heat pump Cooling onl...

Page 5: ... insulation pipe to an appropriate length and wrap it with tape making sure that no gap is left in the insulation pipe s cut line Caulk pipe hole gap with putty The mounting plate should be installed on a wall which can support the weight of the indoor unit How to attach the indoor unit Hook the claws of the bottom frame to the mounting plate If the claws are difficult to hook remove the front gri...

Page 6: ...ront grille there are 3 upper hooks Lightly pull the front grille toward you with one hand and push down on the hooks with the fingers of your other hand When there is no work space because the unit is close to ceiling CAUTION Be sure to wear protection gloves Place both hands under the center of the front grille and while pushing up pull it toward you Installation method 1 Install the front grill...

Page 7: ...NING Do not use mineral oil on flared part Prevent mineral oil from getting into the system as this would reduce the lifetime 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 drier to this R410A unit in order to guarantee its lifetime The drying material may dissolve and damage the system Incomplete flarin...

Page 8: ...s that will withstand this temperature 2 Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below 3 Use separate thermal insulation pipes for gas and liquid refrigerant pipes Gas side Liquid side Gas pipe thermal insulation Liquid pipe thermal insulation O D 1 2 inch 12 7mm O D 1 4 inch 6 4mm I D 0 551 0 630 inch 14 16mm I D 0 315 0 393 inch 8 10mm Minimum b...

Page 9: ... 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 stripped first bundle wire ends with adhesive tape 3 Press the bottom frame of the indoor unit with both hands to set it on the mounting plate hooks Make sure the wires do not catch on the edge of th...

Page 10: ...ng the drain hose through the back of the indoor unit 9 While exercising care so that the inter unit wire do not catch indoor unit press the bottom edge of indoor unit with both hands until it is firmly caught by the mounting plate hooks Secure indoor unit to the mounting plate with indoor unit fixing screws 3 16 1 2 inch M4 12mm Right bottom piping Right side piping Right back piping Bind coolant...

Page 11: ...d wires stranded wires extension cords or starburst connections as they may cause overheating electrical 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 When carrying out wiring connection take care not to pull at the conduit Do not connect the power wire ...

Page 12: ...y to the drain hose attached to the indoor unit as with embedded piping work use any commercially available drain socket nominal diameter 1 2 inch 13mm as a joint The drain hose should be inclined downward No trap is permitted Do not put the end of the hose in water Indoor unit drain hose φ11 16 φ18mm Extension drain hose Heat insulation tube field supply Drain hose supplied with the indoor unit C...

Page 13: ...n its standby mode If the system is not to be used for some time after installation shut off the circuit 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 diagnostic display on RC Check Indoor and out...

Page 14: ... 1104 HT 3P276866 2D M10B203A Two dimensional bar code is a code for manufacturing 00_CV_3P276866 2D fm Page 2 Friday February 18 2011 4 21 PM ...

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