Mitsubishi Electric MXZ-3F54VF4 Installationsanleitung Seite 13

4-7. 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 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 (SW871) 1 minute or more after turning on the
power supply.
• Correction completes in 10 to 15 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 0°C or below.
4-8. 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.
4-9. 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.
100%
67%
100%
Ratio of total indoor units capacity to outdoor unit capacity
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)
Lit Not lit Lit
Once Once Once
Other indications
150%
When the piping length is long
Result
Completed
(Problem corrected or
normal)
Not completed
(Detection failed)
Refer to "SAFETY PRE-
CAUTIONS WHEN LED
BLINKS" located behind
the top panel.
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