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4-7. EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (how to use the remote controller, how to remove the air filters,
how to remove or put the remote controller in the remote controller holder, how to clean, precautions for operation, etc.).
• Recommend the user to read the OPERATING INSTRUCTIONS carefully.
• To feel cool / warm wind, use lower fan speed or reduce the number of indoor units in operation.
When many indoor units are being operated at the same time, capacity of each indoor unit may drop as shown in the graph below.
Operation when the total capacity of the operating indoor units is more than the capacity of the outdoor unit.
4-8. SETTING WHEN THE PIPING LENGTH IS LONG
For a system that connects all rooms and has a total piping length of 40 m or more, change the setting to improve the circulation of the refrigerant.
[How to perform the setting]
1) Be sure to turn off the main power of the air conditioner before performing the setting.
2) To enable this function, set SW1 "6" on the outdoor controller board to ON.
3) Turn on the main power of the air conditioner.
5. PUMPING DOWN
When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere.
1) Turn off the breaker.
2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.
3) Fully close the stop valve on the liquid pipe side of the outdoor unit.
4) Turn on the breaker.
5) Start the emergency COOL operation on all the indoor units.
6) When the pressure gauge shows 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm
stop the operation. (Refer to the indoor unit installation manual about the method for stopping the operation.)
* If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0.05 MPa [Gauge] (approx. 0.5 kgf/cm
function may operate due to the pressure increase in the high-pressure refrigerant circuit. If this occurs, use a refrigerant collecting device to collect all of
the refrigerant in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated.
7) Turn off the breaker. Remove the pressure gauge and the refrigerant piping.
When the refrigeration circuit has a leak, do not execute pump down with the compressor.
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
If the refrigerant pipe are disconnected while the compressor is running and the stop valve is open, air
could be drawn in and the pressure in the refrigeration cycle could become abnormally high.
The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes.
100%
67%
100%
Ratio of total indoor units capacity to outdoor unit capacity
WARNING
150%
When the piping length is long
), fully close the stop valve on the gas pipe side of the outdoor unit and
2
), or the protection
2
En-11
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