6
4. Flaring work
●
Perform
fl
aring work using
fl
aring tool as shown in the
right.
Outside
diameter
A (mm)
Flare tool for
R410A clutch type
Conventional
fl
are tool
Clutch type
Wing nut type
ø6.35 mm
0 to 0.5
1.0 to 1.5
1.5 to 2.0
ø9.52 mm
0 to 0.5
1.0 to 1.5
1.5 to 2.0
Firmly hold copper pipe in a die in the dimension shown in
the table above.
5. Check
●
Compare the
fl
ared work with the
fi
gure below.
●
If
fl
are is noted to be defective, cut off the
fl
ared section
and perform
fl
aring work again.
5-3 PIPE CONNECTION
Note:
Fasten a
fl
are nut with a torque wrench as speci
fi
ed in the table below.
When fastened too tight, a
fl
are nut may be broken after a long period and cause a leakage of refrigerant.
1. Indoor unit connection
●
Connect both liquid pipe and gas pipe to indoor unit.
- Apply a thin coat of refrigeration oil to the seat surface of pipe.
- For connection, align the center of both pipe and union, then tighten the
fi
rst 3 to 4 turns in
fl
are nut by
hand.
- For tightening the union part of the indoor unit side, use the table below as a standard and tighten the
fl
are nut with two wrenches. Excessive tightening damages the
fl
ared section.
Pipe diameter
Tightening torque
N·m
kgf·cm
ø6.35 mm
13.7 to 17.7
140 to 180
ø9.52 mm
34.3 to 41.2
350 to 420
2. Outdoor unit connection
●
Connect pipes to the pipe joint part of the stop valve in the same method as the indoor unit.
- For tightening, use the same tightening torque applied for indoor unit and tighten the
fl
are nut with
torque wrench or spanner.
INSULATION AND TAPING
1
Cover piping joints with pipe cover.
2
For outdoor unit side, surely insulate every piping including valves.
3
Using piping tape
E
, apply taping starting from the entry of outdoor unit.
●
Fix the end of piping tape
E
with adhesive tape.
●
When piping has to be arranged through above ceiling, closet or area where the temperature and humidity
are high, wind additional commercially sold insulation for prevention of condensation.
A
Die
Copper pipe
Flare nut
Die
Copper pipe
Smooth all around
Even length
all around
Inside is shining without any scratches
Yo rk
Flaring tool
Wing nut type
Clutch type
5-4 PURGING PROCEDURES • LEAK TEST
●
Perform the manifold valve work securely according to the installation manual of the manifold valve.
PURGING PROCEDURES
Connect the refrigerant pipes (both liquid pipe and gas pipe) between the indoor and the outdoor
unit.
Remove the service port cap of the stop valve on the gas pipe side of the outdoor unit. (The stop
valve will not work in it initial state fresh out of the factory [totally closed with cap on].)
Connect the gauge manifold valve and the vacuum pump to the service port of the stop valve on the
gas pipe side of the outdoor unit.
Run the vacuum pump. (Vacuumize for more than 15 minutes.)
Check the vacuum with the gauge manifold valve, then close the gauge manifold valve and stop
the vacuum pump.
Leave it as is for one or two minutes. Make sure the pointer of the gauge manifold valve remains in
the same position. Con
fi
rm that the pressure gauge shows –0.101 MPa [Gauge] (–760 mmHg).
(or the vacuum
pump with the
function to prevent
the back flow)
Gauge manifold
valve (for R410A)
Pressure gauge
(for R410A)
Compound pressure
gauge (for R410A)
-0.101MPa
(-760 mmHg)
Handle
Low
Handle High
Window
Charge hose (for R410A)
Vacuum
pump
Adapter for
preventing
the back flow
Charge hose
(for R410A)
Stop valve
(gas side)
Service port
* Perform the purging procedures
on both
unit and
unit sides.
A
B
Remove the gauge manifold valve quickly from the service port of the stop valve.
After refrigerant pipes are connected and evacuated, fully open all stop valves on both sides of gas
pipe and liquid pipe.
Operating without fully opening lowers the performance and this causes trouble.
Pipe length up to 20 m
No gas charge is needed.
Pipe length exceeding 20 m
Charge the prescribed
amount of gas. (refer to 5-1)
Tighten the cap to the service port to obtain the initial status.
Retighten the cap.
Leak test
SG79Y644H01.indd 6
SG79Y644H01.indd 6
29.11.2005 17:04:14 Uhr
29.11.2005 17:04:14 Uhr
Содержание MXZ-2A52VA
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