Mitsubishi Electric MXZ-3D54VA Notice D'installation page 7

4-4. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)
• Description of the function:
With this function, once the operation mode is locked to either COOL/DRY
mode or HEAT mode, the air conditioner operates in that mode only.
* 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 lock the operation mode]
) Be sure to turn off the main power for the air conditioner before making the
setting.
2) Set the "" of SW2 on the outdoor controller board to ON to enable this func-
tion.
3) To lock the operation mode in COOL/DRY mode, set the "2" of SW2 on the
outdoor controller board to OFF. To lock the operation in HEAT mode, set the
same switch to ON.
4) Turn on the main power for the air conditioner.
4-5. 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]
) Be sure to turn off the main power for the air conditioner before making the setting.
2) Set the "3" of SW2 on the outdoor controller board to ON to enable this function.
3) Turn on the main power for the air conditioner.
4-6. 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 oper-
ate 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 combi-
nation, 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 malfunction.
Procedure
Press the piping/wiring correction switch (SW87)  minute or more after turning on the
power supply.
• Correction completes in 0 to 5 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
(SW87) again.
• When the correction completed without error, do not press the piping/wiring correction
switch (SW87) again.
When the result was "cannot be corrected", 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 elimi-
nation before operating this function.
• This function does not operate when the outside temperature is 0°C or below.
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 fil-
ters, 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. RELOCATION AND MAINTENANCE
5-1. 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.
) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.
2) Fully close the stop valve on the liquid pipe side of the outdoor unit.
3) Close the stop valve on the gas pipe side of the outdoor unit almost completely so that it can be easily closed fully when the pressure gauge shows 0
2
MPa [Gauge] (0 kgf/cm ).
4) Start the emergency COOL operation on all the indoor units.
To start the emergency operation in COOL mode, disconnect the power supply plug and/or turn off the breaker. After 5 seconds, connect the power supply
plug and/or turn on the breaker, and then press the E.O. SW once. (The emergency COOL operation can be performed continuously for up to 30 minutes.)
5) Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure gauge shows 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm
6) Stop the emergency COOL operation.
Press the E.O. SW several times until all LED lamps turn off. Refer to operating instructions for details .
When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes. The compressor may burst if air etc. get into it.
WARNING
COOL/DRY HEAT
Lower the operating noise
LED indication during detection:
LED LED2 LED3
(Red) (Yellow) (Green)
Lighted Lighted Once
Result of piping/wiring correction function
LED LED2 LED3
(Red) (Yellow) (Green)
Lighted Not lighted Lighted
Once Once Once
Other indications
Result
Completed
(Problem corrected or
normal)
Not completed
(Detection failed)
Refer to "SAFETY PRE-
CAUTIONS WHEN LED
FLASHES" located behind
the service panel.
2
).
En-6