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4-4. LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT
• Description of the function:
With this function, the operating noise of the outdoor unit can be lowered by reducing the operation load, for example, during nighttime in COOL mode. However, please
note that the cooling and heating capacity may lower if this function is activated.
* Changing the setting is required to activate this function. Please explain about this function to your customers and ask them whether they want to use it.
[How to lower the operating noise]
1) Be sure to turn off the main power for the air conditioner before making the
setting.
2) Set the "5" of SW1 on the outdoor controller board to ON to enable this function.
3) Turn on the main power for the air conditioner.
4-5. TEST RUN
• Test runs of the indoor units should be performed individually. See the installation manual coming with the indoor unit, and make sure all the units operate properly.
• If the test run with all the units is performed at once, possible erroneous connections of the refrigerant pipes and the indoor/outdoor unit connecting wires cannot be
detected. Thus, be sure to perform the test run one by one.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner.
Wiring/piping correction function
This unit has a wiring/piping correction function which corrects wiring and piping combination. When there is possibility of incorrect wiring and piping combination, and
confirming the combination is difficult, use this function to detect and correct the combination by following the procedures below.
Make sure that the following is done.
• Power is supplied to the unit.
• Stop valves are open.
Note:
During detection, the operation of the indoor unit is controlled by the outdoor unit. During detection, the indoor unit automatically stops operation. This is not a malfunc-
tion.
Procedure
Press the piping/wiring correction switch (SW871) 1 minute or more after turning on the
power supply.
• Correction completes in 10 to 20 minutes. When the correction is completed, its result
is shown by LED indication. Details are described in the following table.
• To cancel this function during its operation, press the piping/wiring correction switch
(SW871) again.
• When the correction completed without error, do not press the piping/wiring correction
switch (SW871) again.
When the result is "Not completed", press the piping/wiring correction switch (SW871) again
to cancel this function. Then, confirm the wiring and piping combination in a conventional
manner by operating the indoor units one by one.
• The operation is done while the power is supplied. Make sure not to contact parts other
than the switch, including the P.C. board. This may cause electric shock or burn by hot
parts and live parts around the switch. Contacting the live parts may cause P.C. board
damage.
• To prevent electronic control P.C. board damage, make sure to perform static elimination
before operating this function.
• This function does not operate when the outside temperature is 32°F (0°C) or below.
4-6. 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.
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 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), fully close the stop valve on the gas pipe side of the outdoor unit and 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 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), or the protection 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.
The compressor may burst if air etc. get into it.
WARNING
SW1
ON
1 2 3 4 5 6
Lower the operating noise
LED indication during detection:
LED1
LED2
LED3
(Red)
(Yellow)
(Green)
Lit
Lit
Once
Result of piping/wiring correction function
LED1
LED2
LED3
(Red)
(Yellow)
(Green)
Completed
Lit
Not lit
Lit
(Problem corrected or
normal)
Not completed
Once
Once
Once
(Detection failed)
Refer to "SAFETY PRE-
CAUTIONS WHEN LED
Other indications
BLINKS" located behind
the service panel.
Result
en-8
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