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Installation
EDUS39-600-F1_a
28
FXFQ-M
• Refer to Table 3 for the dimensions of flare nut spaces.
• Refer to Table 3 to determine the proper tightening torque.
Table 3
NOTE
• Apply ester oil or ether oil around the flare portions before
connecting.
• The flare nuts used must be those included with the main
body.
• Over-tightening may damage the flare and cause a refriger-
ant leakage.
Not recommended but in case of emergency
You must use a torque wrench but if not possible, you may
follow the installation method mentioned below.
After the work is finished, make sure to check that there is
no gas leak.
When you continue tightening the flare nut with a there is
a point where the tightening torque suddenly increases.
From that position, further tighten the flare nut the angle
shown below:
Table 4
7-3
Piping insulation
• Execute heat insulation work completely on both sides of
the gas piping and the liquid piping. Otherwise, a water
leakage can result.
• When using a heat pump, the temperature of the gas piping
can reach up to approximately 250°F, so use insulation
which is sufficiently resistant.
• in cases where the temperature and humidity of the refrig-
erant piping sections might exceed 86°F or RH80%, rein-
force the refrigerant insulation. (13/16” / 17.8 mm or
thicker) Condensation may form on the surface of the insu-
lating material.
• Check the pipe connector for gas leaks, then insulate it as
shown in the following drawing.
• Make absolutely sure to execute heat insulation works on the
pipe-connecting section after checking gas leakage by thor-
oughly studying the following figure and using the attached
heat insulating materials for fitting. Fasten both ends with the
accessory clamps.
• Wrap the sealing pad (accessory) only around the insulation
for the joints on the gas piping side.
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.
7-4
Brazing refrigerant piping
• Before brazing local refrigerant piping, nitrogen gas shall be
blown through the piping to expel air from the piping.
If your brazing is done without nitrogen gas blowing, a large
amount of oxide film develops inside the piping, and could
cause system malfunction.
• When brazing the refrigerant piping, only begin brazing after
having carried out nitrogen substitution or while inserting
nitrogen into the refrigerant piping. Once this is done, con-
nect the indoor unit with a flared or a flanged connection.
• Nitrogen should be set to 2.9psi. with a pressure-reducing
valve if brazing while inserting nitrogen into the piping.
DANGER
• Use of oxygen may cause an explosion resulting in serious
injury or death. Only use nitrogen gas.
NOTE
• Do not use flux when brazing refrigerant piping. Therefore,
use the phosphor copper brazing filter metal (BCuP) which
does not require flux.
8.
(Flux has an extremely negative effect on refrigerant
piping systems. For instance, if chlorine based flux is
used, it will cause pipe corrosion and damage the
refrigerant oil.
Pipe
size
Tightening
torque
(ft.lbf)
Flare
dimensions
A (in.)
Flare shape (in.)
φ
1/4”
10.4 – 12.7
0.342-0.358
φ
3/8”
24.1 – 29.4
0.504-0.520
φ
1/2”
36.5 – 44.5
0.638-0.654
φ
5/8”
45.6 – 55.6
0.760-0.776
Pipe size
Further tightening
angle
Recommended arm
length of tool (in.)
φ
1/4” (6.4 mm)
60 to 90 degrees
Approx. 5 7/8
φ
3/8” (9.5 mm)
60 to 90 degrees
Approx. 7 7/8
φ
1/2” (12.7 mm)
30 to 60 degrees
Approx. 9 13/16
φ
5/8” (15.8 mm)
30 to 60 degrees
Approx. 11 13/16
A
45˚
±
2˚
R0.016-
0.031
90˚
±
0.5˚
Medium sealing
pad (attached) 11)
(Wrap the piping union
with the sealing pad.)
Clamp 4)
(×4)
Insulation for
fitting (attached) 9)
(for liquid line)
Insulation for fitting
(attached) 8)
(for gas line)
Gas piping
Liquid piping
Nitrogen
Refrigerant
piping
Part to be
brazed
Taping
Pressurereducing valve
hands
valve
Nitrogen
Summary of Contents for FXFQ-M
Page 1: ...EDUS 39 600 F1_a AMERICAS FXFQ M Ceiling Mounted Cassette Type Multi Flow...
Page 3: ...External Appearance EDUS39 600 F1_a FXFQ M 2 1 External Appearance FXFQ12 36M...
Page 6: ...EDUS39 600 F1_a Dimensions FXFQ M 5 3 Dimensions FXFQ12MVJU FXFQ18MVJU 3D042631...
Page 7: ...Dimensions EDUS39 600 F1_a FXFQ M 6 FXFQ24MVJU 3D042632...
Page 8: ...EDUS39 600 F1_a Dimensions FXFQ M 7 FXFQ30MVJU FXFQ36MVJU 3D042633A...
Page 11: ...Electric Characteristics EDUS39 600 F1_a FXFQ M 10 6 Electric Characteristics...