Mitsubishi Heavy Industries 112KXE6 Service Manual Download

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(C) Data output

(1) 7-segment and operation data retention

(a) 7-segment display

Operation information is displayed for checking various operation data during test run and for helping malfunction
diagnosis at servicing. Input data to microcomputer, contents of outdoor unit control, indoor unit registration information,
or other, are mainly displayed on the 7-segment LED.
(i) Operation information display

➀

Displays each item at 7-segment of 3-digit × 2 on the outdoor unit PCB.

➁

Display is controlled with the following buttons.

SW9: Setting button for order of 10 of display code
SW8: Setting button for order of 1 of display code
SW7: Data erase/write button

➂

Select the order of 10 for the code No. of each item with SW9 or SW8 for the order of 1.

Following identification alphabets are used at the code display.

“C”: “C00” – “C99”

“P”: “P00” – “Pxx” (up to a place where content is specified)

➃

Code [C96]is operable item. It is possible to delete the retained operation data (data of 30 minutes preceding an

anomalous stop) by following resetting procedure.

<Resetting operation>
•  Select code [C96]. If any anomalous data is retained, the data display [dEL] is shown.
•  Pressing SW7 for 3 seconds erases the memory data on RAM.
  (EEPROM data are not erased.)
•  As the data are erased, the data display shows [- - -].
  When no anomalous data are retained, it displays [---] as well.
•  Unless the reset operation is performed, data are retained. Therefore, if normal operation is resumed without

the reset operation and an anomalous stop occurs again, no new anomalous data cannot be retained, but
former anomalous data are still retained unchanged.

➄

If you press SW8 (order of 1), the number changes 0



2 ... 9



➅

If you press SW9 (order of 10), the number jumps to the leading code of each order of 10.

Data display [Cxx] and setting value display [Pxx] are considered to be continuous.

Example: Pressing SW9 at [C07] it changes to [C10]

: Pressing SW9 at [C90], it changes to [P00]

➆

Codes [C44] are operable items. With the following reset operation, the cumulative compressor operation time

corresponding to the code No. can be erased (reset). (Reset of operation time after replacing the compressor)

<Resetting operation>
•  Select codes [C44]. Cumulative compressor operation time up to present is displayed.
•  Pressing SW7 for 3 seconds erases the memory data.
  However, the cumulative compressor operation time data in the 30 minutes log data preceding an anomalous

stop (if this retained log data are not deleted) are not erased by this procedure.

➇

Data display for spare items is left in blank.

(ii) When the temperature is below -10.0°C for the display of discharge pressure saturated temperature and suction

pressure saturated temperature, the fraction after decimal point is rounded up. (Because the range of 7-segment
display is 3-digit.)

(iii) Return the error No. display after an error to the normal display by turning ON the dipswitch SW3-1.