9
Outdoor Unit
Installation Manual
■
Charging Refrigerant
• You need not add refrigerant if the piping length is 40 m or less.
• If the length exceeds 41 m, add 20 g of refrigerant per 1 meter over.
Procedure to Charge Refrigerant
After extraction is complete, close the valves, then charge the refrigerant.
• Make sure that no operations are in progress while charging the
refrigerant.
If you cannot charge the refrigerant fully, add it from the service port of
the service valve at the gas end while cooling operation is in progress.
NOTE
• Charge the refrigerant in a liquid state.
• If you charge the refrigerant in a gas state, the air conditioner will
not operate properly since the refrigerant undergoes a change in its
composition.
Precautions for Adding Refrigerant
• Use a scale with a precision of at least 10 g per index line when adding
the refrigerant.
Do not use bathroom scales or similar instruments.
• Use liquid refrigerant when re
fi
lling.
Since the refrigerant is in liquid form, it can
fi
ll up quickly.
Therefore add the refrigerant gradually.
CAUTION
This product contains fluorinated
greenhouse gases covered by the Kyoto
Protocol.
• Chemical Name of Gas: R410A
• Global Warming Potential (GWP) of gas:
2088
■
Insulation of the Refrigerant Pipes
• Insulate the refrigerant pipes for liquid and gas separately.
Underground piping: 10t
(Laying the pipes on the wall,
ceiling, or under the floor)
Heat-proof bubble polyethylene
■
Gas Leak Inspection
• Perform a gas leak inspection for the
fl
are nut connections, valve stem
connection, and service port cap without fail.
• Use a leak detector exclusively manufactured for R410A.
Flare nut connections
(Indoor unit)
Service port cap
connection
Valve stem cap
connection
Flare nut connections
(Outdoor unit)
* Check point example (RAS-5M34S3AV-A)
■
Performing Additional Installation of an Indoor Unit
1. Collect refrigerant from the outdoor unit.
2. Turn off the circuit breaker.
3. Perform additional installation referring to the procedure from “Refrigerant
Piping Connection” on the previous page.
■
Pump-down Operation (Recovering refrigerant)
CAUTION
Since the forcible running for collecting
refrigerant stops automatically after 10
minutes,
fi
nish collecting refrigerant within
10 minutes.
Electric current is applied on the
control board. Beware of electric
shock.
• The following must be certainly done
during pump down.
• Do not incorporate air into the
refrigeration cycle.
• Close the 2 service valves. Stop the
compressor and remove the refrigerant
pipe.
If the refrigerant pipe is removed when
the compressor is operating and service
valves are opened, the refrigerant cycle
will inhale unwanted matter such as air
and the pressure in the cycle becomes
abnormally elevated. It may cause a
burst or injury.
1. Detach the front panel.
Do not remove the air discharge grille.
2. Turn on the power.
3. Start running all the indoor units connected to the outside unit in the
cooling mode.
4. Press the SW800 button on the P.C board MCC 5071 for 10 to 60
seconds to start the indoor unit(s) in the cooling mode forcibly.
• When the status of each LED changes to that shown on the “While holding
a button (10 to 60 seconds)” row on the table below, release the button.
The status of each LED on the P.C board MCC 5071 changes.
D800
D801
D802
D803
D804
D805
SW800
LED
: LED ON, : LED OFF, : LED Flash
LED
D800
D801
D802
D803
D804
D805
Normal operation
While holding a button
(0 to 10 seconds)
While holding a button
(10 to 60 seconds)
Release a button
5. Close the valve stem of the service valve at the liquid end.
6. Make sure that the compound pressure gauge reading is –101 kPa
(–76 cmHg).
7. Close the valve stem of the service valve at the gas end.
8. Stop running all the indoor units.
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