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ENGLISH
Attach the additional refrigerant table of IDU.
Use only 4-series of indoor unit. Ex) ARNU***4
CAUTION
!
WARNING
• Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following
equation for human safety.
If the above equation can not be satisfied, then follow the
following steps.
• Selection of air conditioning system: select one of the next
- Installation of effective opening part
- Reconfirmation of Outdoor Unit capacity and piping length
- Reduction of the amount of refrigerant
- Installation of 2 or more security device (alarm for gas leakage)
• Change Indoor Unit type
:
installation position should be over 2 m from the floor (Wall
mounted type ’ Cassette type)
• Adoption of ventilation system
: Choose ordinary ventilation system or building ventilation
system.
• Limitation in piping work
: Prepare for earthquake and thermal stress
Ⓐ Manifold Gauge
Ⓑ Low pressure side Handle
Ⓒ High pressure side Handle
!
WARNING
• Pipe to be vacuumed : gas pipe, liquid pipe
• If the refrigerant amount is not exact, it may not operate
properly.
• If additionally bottled refrigerant amount is over 10 %,
condenser burst or insufficient indoor unit performance may be
caused.
!
Volume of the room at which Indoor Unit of
the least capacity is installed
Total amount of refrigerant in the system
≤0.44 (kg / m
3
)
1st
1st
1st
Main pipe
Distribution
2nd
2nd
3rd
3nd
Main pipe
Distribution
1st
3rd
3rd main pipe distribution
2nd
Horizontal Distribution
- Ensure that the branch pipes are attached vertically.
Vertical Distribution
The others
Distribution Method
Refrigerant charging
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