Refrigerant Piping Work - Daikin FVFC71AV16 Installation Manual

REFRIGERANT PIPING WORK

• For the outdoor unit refrigerant piping, refer to the installation manual attached to the outdoor unit.
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 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
• 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.
CAUTION
Do not reuse joints which have been used once already.
2
REFRIGERANT PIPING
CAUTION
1) Use the fl are nut fi xed to the main unit. (To prevent cracking of the fl are nut by aged deterioration.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the fl are. (Use refrigeration oil for R32.)
3) Use torque wrenches when tightening the fl are nuts to prevent damage to the fl are 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.
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration oil to the flare nut
to avoid tightening with excessive torque.
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
6.4 (1/4") 30mm or more
9.5 (3/8") 30mm or more
12.7 (1/2") 40mm or more
15.9 (5/8") 50mm or more
19.1 (3/4") 50mm or more
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
14
[Apply oil]
Apply refrigeration oil to the
inner surface of the flare.
Piping Thermal insulation
radius thickness
0.8mm
(C1220T-O)
1.0mm
(C1220T-O)
(Cut exactly at
right angles.)
Set exactly at the position shown below.
A
Die
Flare's inner surface
must be fl aw-free.
Pipe Size, mm (in)
6.4 (1/4")
9.5 (3/8")
12.7 (1/2")
15.9 (5/8")
19.1 (3/4")
Rain
Thermal insulation
size thickness
I.D. 8-10mm
I.D. 12-15mm
I.D. 14-16mm 10mm Min.
I.D. 16-20mm
I.D. 20-24mm
Remove burrs.
Flaring
A (mm)
Flare Tool for
Pipe Size, Conventional flare tool
R32/R410A
mm (in)
Clutch-type
Clutch-type
(Ridgid-type)
6.4 (1/4") 0-0.5 1.0-1.5
9.5 (3/8") 0-0.5 1.0-1.5
12.7 (1/2") 0-0.5 1.0-1.5
15.9 (5/8") 0-0.5 1.0-1.5
19.1 (3/4") 0-0.5 1.0-1.5
Check
The pipe end must
be evenly fl ared in
a perfect circle.
Make sure that the
fl are nut is fi tted.
[Tighten]
Torque wrench
Spanner
Pipe union
Flare nut
Torque, Nm/(ft-lb)
18 (13.3)
42 (31.0)
55 (40.6)
65 (48.0)
78 (57.6)
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.
Inter-unit wire
Gas pipe
Gas pipe
insulation
Finishing tape
Wing-nut type
(Imperial-type)
1.5-2.0
1.5-2.0
2.0-2.5
2.0-2.5
2.0-2.5
Wall
Liquid pipe
Liquid pipe
insulation
Drain hose