30
ENGLISH
NOTE
!
Always add an appropriate amount of refrigerant. (For the refrigerant
additional charge)
Too much or too little refrigerant will cause trouble.
To use the Vacuum Mode (If the Vacuum mode is set, all valves of Indoor
units and Outdoor units will be opened.)
WARNING
Use a vacuum pump or Inert(nitrogen) gas when doing leakage test
or air purge. Do not compress air or Oxygen and do not use
Flammable gases. Otherwise, it may cause fire or explosion.
- There is the risk of death, injury, fire or explosion.
!
WARNING
When installing and moving the air conditioner to another site,
recharge after perfect evacuation.
- If a different refrigerant or air is mixed with the original
refrigerant, the refrigerant cycle may malfunction and the unit
may be damaged.
!
Series Installation (Heat Recovery)
Scale
Use a graviometer. (One that can measure
down to 0.1 kg (0.22 lbs)). If you are
unable to prepare such a high-precision
gravimeter you may use a charge cylinder.
Vacuum
pump
Vacuum
pump
Indoor unit
Slave 1 outdoor unit Master outdoor unit
Liquid pipe
High Pressure
Gas pipe
High Pressure
Gas pipe
Liquid pipe
Low Pressure
Gas pipe
Low Pressure
Gas pipe
Liquid side
Gas side
Close
Close
Close
Close
Close
Close
HR unit
Liquid Pipe
Low Pressure
Gas Pipe
High Pressure
Gas Pipe
For Heat Recovery System Installation
Ⓐ Manifold Gauge
Ⓑ Low pressure side Handle
Ⓒ High pressure side Handle
Liquid Pipe
Not used
(keep closed)
Gas Pipe
For Heat Pump System Installation
Ⓐ Manifold Gauge
Ⓑ Low Pressure Side Handle
Ⓒ High Pressure Side Handle
WARNING
• Pipe to be vacuumed : gas pipe, liquid pipe
(In case of Heat Recovery system, pipe to be vacuumed : High
pressure gas pipe, Low pressure 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.
!
Refrigerant charging
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