Daikin RXC50BV1B [20/320] Refrigerant piping
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Daikin RXC50BV1B [20/320] Refrigerant piping

Daikin FTXC20BV1B [20/320] Refrigerant piping
1-18
• 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.
• Do never install a drier to this R32 unit in order to guarantee its
lifetime.
• The drying material may dissolve and damage the system.
• Incomplete flaring may cause refrigerant gas leakage.
WARNING
Do not reuse joints which have been used once already.
CAUTION
4
REFRIGERANT PIPING
1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32.)
3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
CAUTION
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.
1. Cautions on pipe 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. 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.
Piping size, mm (in)
Minimum bend
radius
Piping thickness
Thermal insulation
size
Thermal insulation
thickness
6.40 (1/4") 30mm or more
0.8mm
(C1220T-O)
I.D. 8-10mm
10mm Min.
9.52 (3/8") 30mm or more I.D. 12-15mm
12.70 (1/2") 40mm or more I.D. 14-16mm
15.88 (5/8") 50mm or more
1.0mm
(C1220T-O)
I.D. 16-20mm
19.05 (3/4") 50mm or more I.D. 20-24mm
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Ø Tube, D A (mm)
Inch
mm Imperial
(Wing-nut Type)
Rigid
(Clutch Type)
1/4" 6.40 1.3 0.7
3/8" 9.52 1.6 1.0
1/2" 12.70 1.9 1.3
5/8" 15.88
2.2 1.7
3/4" 19.05
2.5 2.0
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
[Apply oil]
Apply refrigeration oil to the
inner surface of the flare.
Do not apply refrigeration
oil to the outer surface.
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
Flare nut
[Tighten]
Torque wrench
Spanner
Pipe union
Flare nut
Wall
Rain
Be sure to
place a cap.
If no flare cap is
available, co ver the
flare mouth with tape to
keep dirt or water out.
Pipe Size, mm (in) Torque, Nm/(ft-lb)
6.40 (1/4") 18 (13.3)
9.52 (3/8") 42 (31.0)
12.70 (1/2") 55 (40.6)
15.88 (5/8") 65 (48.0)
19.05 (3/4") 78 (57.6)
Inter-unit wire
Drain hose
Liquid pipe
insulation
Gas pipe
insulation
Finishing tape
Gas pipe
Liquid pipe

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