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20 TEST OPERATION AND SELF DIAGNOSIS
20.1. Test operation
• • • • Always be sure to use a properly-insulated tool to operate
the switch on the circuit board. (Do not use your finger or a
metallic object).
• • • • Never turn on the power supply until all installation work has
been completed.
• • • • Turn on the circuit breaker before test operation extends
past 6 hours.
(The crankcase heater will become energized, which will
warm the compressor and prevent liquid compression.)
• • • • For three-phase models, check that the phase is not
reversed.
20.2. Test operation from the outdoor unit
(Outdoor unit printed circuit board)
During outdoor unit emergency operation or test operation, the
LEDs on the printed circuit board will flash.
To cancel test operation, press the TEST or RUN button once
more while test operation is being carried out.
(Test operation will stop automatically after 30 minutes have
passed.)
NOTE:
1. These units are equipped with connection error prevention
circuits. If the units do not operate, it is possible that the
connection error prevention circuits have operated. In such
cases, check that the drive wires (connected to terminals [1]
and [2]) and the control wires (connected to terminals [3]
and [4]) are connected correctly. If they are connected
incorrectly, connect them correctly. Normal operation
should then commence.
(If the phase is reversed, the LED on the printed circuit
board will flash.)
• • • • Check that the voltage is 198 V or higher when starting the
unit. (The unit will not operate if the voltage is less than
198V.)
• • • • Carry out test operation for 5 minutes or more using the
remote control or the switch on the outdoor unit printed
circuit board.
• • • • Always carry out cooling first during test operation, even
during the warm season.
(If heating is carried out first, problems with operation of the
compressor will result.)
2. Do not short the remote control unit wires to each other.
(The protection circuit will be activated and the units will not
operate.)
Once the cause of the short is eliminated, normal operation
will then be possible.
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