A
90
Refrigerant Piping Connection
Tightening connection
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.
(Unit : N·m)
Outer dia. of copper pipe
Tightening torque
6.35 mm
16 to 18 (1.6 to 1.8 kgf·m)
12.70 mm
50 to 62 (5.0 to 6.2 kgf·m)
•
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 specifi 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. Cut the pipe with a pipe cutter.
Obliquity
Roughness
Warp
Half uniont
Flare nut
Pipe
Die
Use a wrench to secure.
Use a torque wrench to tighten.
2. Insert a fl are nut into the pipe and fl are the pipe.
•
Projection margin in fl aring : A (Unit : mm)
Outer dia.
of copper pipe
A
Rigid
Imperial
6.35
1.0 to 1.5
1.5 to 2.0
12.70
1.0 to 1.5
2.0 to 2.5
CAUTION
Do not apply excess torque. Otherwise, the nut may crack depending on
the conditions.
Internally
threaded side
Externally
threaded side
CAUTION
•
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.
After the piping has been connected to the indoor unit, you can perform the
air purge together at once.
Using a vacuum pump
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.
A
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 confi 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
Vacuum
pump
Handle Lo
–101 kPa
(–76 cmHg)
Packed valve handling precautions
•
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:
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 identifi ed by the matching
numbers on the terminal block of indoor and outdoor unit.
3. Insert the power cord and the connecting cable carefully into the terminal
block and secure it tightly with screws.
4. Use vinyl tape, etc. to insulate the cords which are not 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.
TO CHARGE REFRIGERANT
Refrigerant
18 Class
24 Class
Non refrigerant charging
Less than 15 m
Less than 15 m
Refrigerant charging
15 – 20 m (20g/m)
15 – 25 m (20g/m)
Hexagon wrench
is required.
Pipe side
Tightening torque
A
Gas side
(
12.70 mm)
50 to 62 N·m
(5.0 to 6.2 kgf·m)
4 mm
Liquide side
(
6.35 mm)
16 to 18 N·m
(1.6 to 1.8 kgf·m)
Same as
gas side
Service port
9 to 10 N·m
(0.9 to 1.0 kgf·m)
Vacuum pump adapter for
counter-fl ow prevention
(For R410A only)
AIR PURGE
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.
Service port (Valve core (Setting pin))
Charge hose
(For R410A only)
Charge hose
(For R410A only)
Manifold valve
Pressure gauge
Compound pressure gauge
Handle Hi
(Keep full closed)
Connecting pipe
Packed valve at gas side
Evacuating
Flare at
indoor unit side
Flare at
outdoor unit side
6
EN
ES
FR
IT
VT
PL
CZ
RU
CR
HU
TR
NL
GR
SV
FI
NO
DK
RO
BG
EE
LV
SK
SI
VT
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2/2/09 11:15:11 AM
