Mitsubishi Heavy Industries FDT100VNP1VF2 Technical Manual page 223

⑤ Receiver (continued)
Backup button
A backup switch is provided on the receiver section of the panel surface.
When operation from the wireless remote control unit is not possible (due to at batteries, a mislaid unit, a unit
failure), you can use it as an emergency means. You should operate this switch manually.
(1) If pressed while the air-conditioner is in a halt, it will cause the air-conditioner to start operation in the
automatic mode (in the case of cooling only, in the cooling mode).
Wind speed: Hi fan, Temperature setting: 23°C, Louver: horizontal
(2) If pressed while the air-conditioner is in operation, it will stop the air-conditioner.
Cooling test run operation
• After safety con rmation, turn on the power.
• Transmit a cooling operation command with the wireless remote control unit, while the backup switch on the
receiver is depressed.
• If the backup switch on the receiver is pressed during a test run, it will end the test run.
• If you cannot operate the unit properly during a test run, please check wiring by consulting with inspection
guides.
How to read the two-digit display
A two-digit indicator (7-segment indicator) is provided on the receiver section.
(1) An indication will be displayed for one hour after power on.
(2) An indication appears for 3.5 seconds when a Stop command is sent from the wireless remote control unit
while the air-conditioner is not running.
(3) An indication appearing in (1) or (2) above will go off as soon as the unit starts operation.
(4) When there are no error records to indicate, addresses are displayed for all of the connected units.
(5) When there are some error records remaining, the error records are displayed.
(6) Error records can be cleared by transmitting a "Stop" command from the wireless remote control unit, while
the backup switch is depressed.
Light receiving section
TIMER
CHECK RUN
7-segment indicator
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Backup switch