Mitsubishi Electric SLH Series Technical & Service Manual page 55

7. TEST RUN
Measure an impedance between the power supply terminal block on the outdoor unit and the ground with
a 500 V Megger and check that it is equal to or greater than 1.0MΩ.
• Before performing the test run, recheck for any wrong wiring.
Wrong wiring prevents normal operation or results in blown fuse disabling operation.
• The test run can be started by pressing emergency operation switch (cooling/heating). When the emergency operation
switch is once pressed, the unit will start the test run (continuous operation) for 30 minutes.
A thermostat does not work during this time. After 30 minutes the unit will start the emergency operation at a fixed temperature
setting of 24°C in cooling mode or heating mode.
Operation lamp
Procedure
1 Press the
button [Emergency operation switch(cooling)] to start the cooling operation.
If the [Operation lamp] blinks every 0.5 seconds, inspect the indoor/outdoor connecting wire for mis-wiring.
• Check that the vanes operate properly when cool air is blown out.
2 Press it once more, and the operation stops.
3 Press the
button [Emergency operation switch(heating)] to start the heating operation. (SLH only)
Check that warm air blows out.
• In starting the heating operation, indoor unit fan may not operate to prevent blowing cool air. Please wait for a few minutes
unit the temperature of heat exchanger rises and warm air blows out.
4 Press it once more, and the operation stops. (SLH only)
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller and check that an electronic sound is heard from the indoor unit. Press the
ON/OFF button again to turn the air conditioner off.
If the indoor unit is operated with the remote controller, both the test run and the emergency operation are released
by commands from the remote controller.
Once the compressor stop, the restart preventive device operates so the compressor will not operate for three minutes to
protect the air conditioner.
8. SERVICE FUNCTION
• AUTO RESTART FUNCTION
Indoor controller board
1 Remove 2 screws to detach the electric component cover.
2 Cut the JP8 jumper wire of the indoor controller board with a pair of nippers.
Indoor controller board
JP8
C412
RC00J590B
Note : (Auto restart function)
• When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are
memorized by the indoor controller board. The auto restart function sets to work the moment the power has restored after
power failure, then, the unit will restart automatically.
• If the main power (220-240V AC) has been cut, the operation settings remain.
• When three minutes have passed after power was restored, the unit will restart automatically settings are memorized when
10 seconds have passed after the remote controller was operated.
Emergency operation
switch(heating)
Emergency operation
switch(cooling)
52C
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