Daikin FDYMP75DXV1 Installationshandbuch Seite 13

Piping Works And Flaring Technique
• Do not use contaminated or damaged copper tubing. If any
piping, evaporator or condenser had been exposed or had
been opened for 15 seconds or more, the system must be
vacuumed. Generally, do not remove plastic, rubber plugs
and brass nuts from the valves, fittings, tubings and coils
until it is ready for connection.
• If any brazing work is required, ensure that the nitrogen
gas is passed through piping and joints while the brazing
work is being done. This will eliminate soot formation on
the inside walls of the copper tubings.
• Cut the pipe stage by stage, advancing the blade of pipe
cutter slowly. Extra force and deep cut will cause more
distortion of pipe and therefore extra burr. See Figure I.
• Remove burrs from cut edges of pipes with a remover
as shown in Figure II. This will avoid unevenness on the
flare faces which will cause gas leak. Hold the pipe on top
position and burr remover at lower position to prevent metal
chips from entering the pipe.
• Insert the flare nuts mounted on the connection parts of both
indoor and outdoor unit, into the copper pipes.
• The exact length of pipe protruding from the face of the swaging
block is determined by the flaring tool. See Figure III.
• Fix the pipe firmly on the swaging block. Match the centers
of both the flare die and the flaring punch, and tighten
flaring punch fully.
Figure I
Cutting Copper Tube
1/4t
Copper Tube
Figure II
Remove Burr
Figure III Copper Tube
Swaging Block
Special Precautions When Mounting TXV Bulb
• TXV bulb should be clamped to the suction line near the
evaporator outlet, and if possible, on a horizontal run.
• Clean suction line completely before clamping the bulb
in place.
• Clamp the bulb to a free draining suction line.
• Insulate the bulb from ambient.
Note: The TXV bulb must be fixed at suction line at 8 o'clock
or 4 o'clock.
D
! CAUTION
Filter dryer may not be supplied but is required for unit operation
TXV bulb placement in relation to suction line size
TXV Bulb on small Suction Line
45˚
TXV Bulb on large Suction Line
Piping Connection To The Units
• Align the center of the piping and sufficiently tighten the
flare nut with fingers. See Figure IV.
• Finally, tighten the flare nut with torque wrench until the
wrench clicks.
• When tightening the flare nut with the torque wrench,
ensure that the direction for tightening follows the arrow
on the wrench.
• The refrigerant pipe connection are insulated by closed
cell polyurethane.
Ø Tube, D
Inch mm Imperial
(Wing-nut Type)
1/4" 6.35
3/8" 9.52
1/2" 12.70
5/8" 15.88
3/4" 19.05
Pipe Size, mm (in)
6.35 (1/4")
9.52 (3/8")
12.70 (1/2")
15.88 (5/8")
19.05 (3/4")
Figure IV
Flare Joint
Indoor Piping
Spanar
1-11
A (mm)
Rigid
(Clutch Type)
1.3 0.7
1.6 1.0
1.9 1.3
2.2 1.7
2.5 2.0
Torque, Nm / (ft-Ib)
18 (13.3)
42 (31.0)
55 (40.6)
65 (48.0)
78 (57.6)
Flared Tube
Flare Nut
Torque Wrench