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Refrigerant Piping Work

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 R32 or R410A.)
• Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.

Align the centres 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 (0.035 to 0.045kcal/mh°C)
Refrigerant gas pipe’s surface temperature reaches 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 for gas and liquid refrigerant pipes.

Flare nut tightening torque

Gas side

Liquid side

3/8 inch

1/2 inch

1/4 inch

32.7-39.9N•m

(330-407kgf•cm)

49.5-60.3N•m

(505-615kgf•cm)

14.2-17.2N•m

(144-175kgf•cm)

Gas side

Liquid side

Gas pipe thermal insulation

Liquid pipe 

thermal insulation

25/35 class

50 class

O.D. 6.4mm

25/35 class

50 class

I.D. 8-10mm

O.D. 9.5mm

O.D. 12.7mm

I.D. 12-15mm

I.D. 14-16mm

Minimum bend radius

Thickness 10mm Min.

30mm or more

40mm or more

30mm or more

 Thickness 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 to avoid tightening 
with excessive torque.

[Apply oil]

Torque wrench

Piping union

Flare nut

Spanner

[Tighten]

Wall

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

Rain

Be sure to 
place a cap.

Gas pipe

Liquid pipe

Gas pipe 
insulation

Liquid pipe 
insulation

Finishing tape

Drain hose

Inter-unit wire

Summary of Contents for FTXJ20MV1BS

Page 1: ...R32 Split Series INSTALLATION MANUAL DAIKIN ROOM AIR CONDITIONER MODELS FTXJ20MV1BW FTXJ20MV1BS FTXJ25MV1BW FTXJ25MV1BS FTXJ35MV1BW FTXJ35MV1BS FTXJ50MV1BW FTXJ50MV1BS...

Page 2: ...nte por B de acuerdo con el Certificado C 06 Nota delineato nel A e giudicato positivamente da B secondo il Certificato C 07 A B C 08 Nota tal como estabelecido em A e com o parecer positivo de B de a...

Page 3: ...lead as this may cause overheating electric shocks or fire Make sure that all wiring is secured the specified wires are used and that there is no strain on the terminal connections or wires Improper c...

Page 4: ...troller signals are properly received by the indoor unit within 6m CAUTION Do not install the air conditioner at any place where there is a danger of flammable gas leakage In the event of a gas leakag...

Page 5: ...finishing tape from bottom to top Cut thermal 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...

Page 6: ...e front panel locks on the back of the front panel upward to release the locks left and right sides 2 Insert the panel shafts on both sides of the upper front panel into the shaft holes 3 Slide the fr...

Page 7: ...6 Install the air filter and then mount the upper front panel 3 How to set the different addresses When two indoor units are installed in one room the two wireless remote controllers can be set for di...

Page 8: ...e cutter 2 Remove burrs with the cut surface facing downward so that the chips do not enter the pipe 3 Put the flare nut on the pipe 4 Flare the pipe 5 Check that the flaring is properly made WARNING...

Page 9: ...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 insulat...

Page 10: ...the upper front panel then remove the service lid 2 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...

Page 11: ...ant pipes and drain hose together with insulation tape as shown in the figure on the right in case of setting the drain hose through the back of the indoor unit Left back piping Right back piping Bind...

Page 12: ...nit side Apply the blade of the copping saw to the notch and cut off the pipe port cover along the uneven inner surface 2 After cutting off the pipe port cover perform filing Remove the burrs along th...

Page 13: ...for the drain pump etc from the terminal block Doing so may cause electric shock or fire Do not connect the indoor unit to the mains electricity Connect it to the outdoor unit only or there may be dan...

Page 14: ...circuit board BZ Buzzer FG Frame ground F1U F2U Fuse H1P H2P Pilot lamp M1F Fan motor M1S M2S M3S Swing motor M1 Stepping motor R1T R2T Thermistor S25 S200 Connector S1C Limit switch S1W Operation sw...

Page 15: ...llation 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...

Page 16: ...3P393185 6K 2015 11 Copyright 2015 Daikin...

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