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REFRIGERANT PIPING WORK
< Refer to the attached installation manual for the outdoor unit for its refrigerant piping.>
<Provide heat insulation work completely on both sides of the gas piping and the liquid piping. Otherwise it may result in water leak-
age. (Please use insulation materials which can bear high temperatures of 120°C or above.) The heat insulation layer of the refriger-
ant piping has to be thickened (with the thickness above 20 mm) if the temperature exceeds 30°C and the humidity is above 80% RH
at the refrigerant piping; otherwise condensation may occure on the surface of the insulation materials.>
<Before refrigerant piping work, check which type of refrigerant is used. The machine may not work properly if incorrect refrigerant is
used.>
CAUTION
• Use a pipe cutter and flare tool suitable for the type of refrigerant.
• Apply refrigerant oil or either oil around the flare portions before connecting.
• To prevent dust, moisture or other foreign matter from infiltrating the tube, pinch or enclose the ends of the tube.
• Do not allow anything other than the designated refrigerant to get mixed into the refrigerant circuit, such as air, etc.
If any refrigerant gas leaks, ventilate the room thoroughly right away.
• The outdoor unit is already charged with refrigerant.
• Use a common wrench and a torque wrench when installing/removing the piping of the machine, as illustrated herein.
• Please ensure good ventilation at the installation site since leakage from the refrigerant pipelines may occur during installation.
Check the size of the refrigerant piping with the chart below.
• Fill the indoor unit with refrigerant.
See the installation manual that came with the outdoor unit for details on the refrigerant piping.
Model
Gas pipe
φ28.6 L=12
FDQ16
φ28.6 L=12
FDQ20
(L=Insertion length, refer to Fig. 11)
• Remove the cardboard. Before heating the pipe, cut the end of the plug in order to remove it. (Refer to Fig.10)
• After brazing these pipes as shown in Fig.11, use the fitting insulation to secure the pipe inside of the unit . (Refer to Figs.12-1 and 13)
• Install the clamps as close to the body as possible to absorb leaking condensation. After clamping, wrap the clamp with insulation
(field supply). This is to prevent condensation from forming on the clamp section.
• Wrap the fitting insulation's joints with tape (field supply), making sure that there is no gap between the fitting insulation. (Refer to
Fig.12-2)
• Prevent any gas mixture other than the specified refrigerant from entering into the refrigerating cycle.
• Please ensure good ventilation at the installation site if leakage of refrigerant gas occurs during installation.
• Insulate the connecting pipelines completely because the temperature at the gas piping may reach up to 120°C during the heating
process.
Use fitting insulation which can endure the highest temperature.
Fig.10
Cardboard
Cut before
Indoor unit
heating
Plug
10
Refrigerant piping size
Liquid pipe
φ12.7 L=8
φ15.9 L=8
Fig.11
Insertion
length L (mm)
To outdoor unit
90˚
Copper
pipe
Wrap with a wet cloth to
prevent heat conduction.
Insulation for fitting
(field supply)
Tape
(field supply)
WARNING
• Do not heat the plugs before cutting off their ends in
order to release pressure, otherwise the plugs may
burst.
• Be careful not to burn the body of air conditioner when
brazing the pipe.
• Wrap the piping with a wet cloth to prevent heat con-
duction during brazing.
Fig.12-1
Indoor unit
Insulation for fitting (1)
(accessory)
Gas
piping
Insulate the piping using the
fitting insulation (field supply)
Fig.12-2
[Unit:mm]
Fig.13
Indoor unit
15 or more
Outside
Inside
(2) (1)
Seal the
Clamp (4)
holes
(accessory)
Insulation for fitting (2)
(accessory)
Liquid piping
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