EN
ES
FR
IT
DE
PT
PL
CZ
RU
CR
HU
TR
NL
GR
SV
FI
NO
DK
RO
BG
EE
LV
SK
SI
7
A
90
CAUTION
Refrigerant Piping Connection
1. Cut the pipe with a pipe cutter.
2. Insert a
fl
are nut into the pipe and
fl
are the pipe.
•
Projection margin in
fl
aring : A (Unit : mm)
Rigid (clutch type)
Imperial (wing nut type)
Outer dia. of copper pipe
R410A
6.35 mm
1.5 to 2.0
12.70 mm
2.0 to 2.5
Align the centers of the connecting pipes and tighten the
fl
are nut as far as
possible with your
fi
ngers. Then tighten the nut with a spanner and torque
wrench as shown in the
fi
gure.
Tightening connection
Do not apply excess torque. Otherwise, the nut may crack depending on
the conditions.
(Unit : N·m)
Outer dia. of copper pipe
Tightening torque
6.35 mm
14 to 18 (1.4 to 1.8 kgf·m)
12.70 mm
50 to 62 (5.0 to 6.2 kgf·m)
Evacuating
After the piping has been connected to the indoor unit, you can perform
vacuuming together at once.
VACUUMING
Evacuate the air in the connecting pipes and in the indoor unit using a
vacuum pump. Do not use the refrigerant in the outdoor unit. For details,
see the manual of the vacuum pump.
Outer dia.
of copper pipe
R410A tool used
Conventional tool
used
6.35 mm
0 to 0.5
1.0 to 1.5
12.70 mm
0 to 0.5
1.0 to 1.5
•
Tightening torque for connection of
fl
are pipe
The pressure of R410A is higher than
R22. (Approx. 1.6 times.) Therefore
securely tighten the
fl
are pipes which
connect the outdoor unit and the
indoor unit with the speci
fi
ed tightening
torque using a torque wrench. If any
fl
are pipe is incorrectly connected, it
may cause not only a gas leakage but
also trouble in the refrigeration cycle.
Flaring
1. Connect the charge hose from the manifold valve to the service port of
the packed valve at gas side.
2. Connect the charge hose to the port of the vacuum pump.
3. Open fully the low pressure side handle of the gauge manifold valve.
4. Operate the vacuum pump to start evacuating. Perform evacuating for
about 15 minutes if the piping length is 20 meters. (15 minutes for 20
meters) (assuming a pump capacity of 27 liters per minute) Then con
fi
rm
that the compound pressure gauge reading is –101 kPa (–76 cmHg).
5. Close the low pressure side valve handle of the gauge manifold valve.
6. Open fully the valve stem of the packed valves (both gas and liquid sides).
7. Remove the charging hose from the service port.
8. Securely tighten the caps on the packed valves.
Packed valve at liquid side
Service port (Valve core (Setting pin))
Packed valve at gas side
Vacuum
pump
Vacuum pump adapter for
counter-
fl
ow prevention
(For R410A only)
Charge hose
(For R410A only)
Handle Hi
(Keep full closed)
Manifold valve
Pressure gauge
Compound pressure gauge
Handle Lo
Charge hose
(For R410A only)
Connecting pipe
–101 kPa
(–76 cmHg)
• Open the valve stem until it touches the stopper. Once it is in contact with
the stopper, refrain from applying any more force than is necessary.
• Securely tighten the valve stem cap with torque in the following table:
Packed valve handling precautions
Gas side
(dia. 12.70 mm)
50 to 62 N·m
(5.0 to 6.2 kgf·m)
Liquid side
(dia. 6.35 mm)
14 to 18 N·m
(1.4 to 1.8 kgf·m)
Service port
14 to 18 N·m
(1.4 to 1.8 kgf·m)
•
KEEP IMPORTANT 5 POINTS FOR PIPING WORK.
(1) Take away dust and moisture (inside of the connecting pipes).
(2) Tighten the connections (between pipes and unit).
(3) Evacuate the air in the connecting pipes using a VACUUM PUMP.
(4) Check gas leak (connected points).
(5) Be sure to fully open the packed valves before operation.
CAUTION
Wiring Connection
1. Remove the valve cover, the electric parts cover and the cord clamp from
the outdoor unit.
2. Connect the connecting cable to the terminal as identi
fi
ed by the
matching numbers on the terminal block of indoor and outdoor unit.
3. Insert the power cord and the connecting cable fully into the terminal
block and secure it tightly with screws.
4. Use vinyl tape, etc. to insulate the cords which are not going to be used.
Locate them so that they do not touch any electrical or metal parts.
5. Secure the power cord and the connecting cable with the cord clamp.
6. Attach the electric parts cover and the valve cover on the outdoor unit.
Electrical Work
1. The supply voltage must be the same as the rated voltage of the air
conditioner.
2. Prepare the power source for exclusive use with the air conditioner.
NOTE
• Wire type : H07RN-F or 60245 IEC66 (1.5 mm
2
or more)
Be sure to use a vacuum pump with counter-
fl
ow prevention function so
that inside oil of the pump does not
fl
ow backward into pipes of the air
conditioner when the pump stops.
(If oil inside of the vacuum pump enters the air conditioner, which use
R410A, refrigeration cycle trouble may happen.)
Using a vacuum pump
Obliquity
Roughness
Warp
Half uniont
Flare nut
Externally
threaded side
Internally
threaded side
Pipe
Die
Flare at
indoor unit side
Flare at
outdoor unit side
Hexagon wrench
is required.
4 mm
Use a wrench to secure.
Use a torque wrench to tighten.
1110651154-EN.indd 7
1110651154-EN.indd 7
2/15/10 9:39:41 AM
2/15/10 9:39:41 AM
