EDUS39-600-F2_a Installation
FXDQ-M 23
than a flare part. If oil adheres to resin parts., deteriora-
tion can occur.
• Refer to Table 2 if no torque wrench is available.
Using a wrench to tighten flare nuts causes the tightening
torque to suddenly grow much tighter after a certain point.
From there, tighten the nut further by the appropriate angle
listed in Table 2.
(5) After the work is finished, ensure there is no gas leak.
(6) After checking for gas leaks, be sure to insulate the
pipe connections referring to Fig. 8.
• Insulate using the insulation for fitting (3) (4) included
with the liquid and gas pipes. Besides, make sure the
insulation for fitting (3) (4) on the liquid and gas piping
has its seams facing up.
Tighten both edges with clamp (9).
• For the gas piping, wrap the middle sealing pad (6) over
the insulation for fitting (4) flare nut part.
CAUTION
Be sure to insulate any field piping all the way to the piping
connection inside the unit. Any exposed piping may cause
condensation or burns if touched.
• When brazing the refrigerant piping, perform nitrogen
replacement first, or perform the brazing while feeding
nitrogen into the refrigerant piping, and then connect the
indoor unit using the flare connections. (Refer to Fig. 9)
CAUTION
• When brazing a pipe while feeding nitrogen inside the pipe,
make sure to set the nitrogen pressure to 29 psi or less
using the pressure reducing valve.
Not recommendable but in case of emergency
You must use a torque wrench but if it is necessary to install
the unit without a torque wrench, you may follow the installa-
tion method mentioned below.
After the work is finished, make sure to check that there is
no gas leak.
When you keep on tightening the flare nut with a spanner,
there is a point where the tightening torque suddenly
increases. From that position, further tighten the flare nut the
angle shown below:
Ta ble 2
DANGER
• Use of oxygen could result in an explosion resulting in seri-
ous injury or death. Only use nitrogen gas.
• Refrigerant gas may produce toxic gas if it comes in contact
with fire such as from a fan heater, stove or cooking device.
Exposure to this gas could cause severe injury or death.
NOTE
• Do not use flux when brazing refrigerant piping. Therefore,
use the phosphor copper brazing filler metal (BCuP) which
does not require flux.
(Flux has an extremely negative effect on refrigerant piping
systems. For instance, if chlorine based flux is used, it will
cause pipe corrosion. Flux containing fluorine will damage
refrigerant oil.)
Gas pipe
Piping insulation
material (main unit)
Attach to base
Flare nut connection
Turn seams up
Mid. sealing pad (6) (accessory)
Insulation for fitting (4) (accessory)
Gas Piping Insulation Procedure
Liquid Piping Insulation Procedure
(accessory)
Clamp (9)
Piping insulation material
(Field supply)
Clamp (9) (accessory)
Flare nut connection
Turn seams up
Piping insulation material
(Field supply)
Piping insulation material
(main unit)
Attach to base
Main unit
Fig. 8
Liquid pipe
Insulation for fitting (3) (accessory)
Wrap over the top of
the flare nut connection.
Main unit
Pipe size (in.) Further tightening angle
Recommended arm
length of tool (in.)
φ1/4 60 to 90 degrees Approx. 5-7/8
φ3/8 60 to 90 degrees Approx. 7-7/8
φ1/2 30 to 60 degrees Approx. 9-13/16
φ5/8 30 to 60 degrees Approx. 11-13/16
Refrigerant piping
Part to be brazed
Taping
Pressure-reducing valve
hands
valve
Nitrogen
Nitrogen
Fig. 9
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