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• Switch the power supply ON at least 12 hours before the test run.
• Removing a connector while the current is running can cause damage to the control board. Once the power
supply is turned OFF, be sure to wait 5 minutes or more before starting to work on it.
• Follow the indoor and outdoor units’ instructions.
• Before the test run, ensure to check that the 3-way valve is open. Operating while the valve is closed causes
the compressor to fail.
• Ensure to connect the refrigerant piping and the related wiring to the same refrigerant system.
If the refrigerant piping and the related wiring are different and not connected to the same refrigerant system,
it leads to abnormal operation and causes damage to the unit.
Test Run Procedure
• Ensure to conduct a test run. In addition, be sure to run the cooling operation test run for at least 20 minutes
before starting the heating operation test run.
• If you cannot be near the outdoor unit during test run, request for another person to replace you or install a
frontal panel.
• Once the cooling test run is functioning properly, check that the outflow from the indoor unit is cool.
• Once the heating test run is functioning properly, check that the outflow from the indoor unit is warm.
• If the indoor unit has a wired remote controller attached, check that the temperature values displayed during
test run for the heat exchanger are as follows.
(The heat exchanger temperature is displayed on the wired remote controller timer display screen.)
The heat exchanger temperature during the cooling test run is 6 to 20°C and during the heating test run it is
25 to 55°C.
If the connected indoor unit’s capacity exceeds 100% or if the pipe length is long, the heat exchanger
temperature during cooling test run will be high and low during heating test run.
• If the units do not operate during test run, perform the malfunctioning diagnostics to countermeasure any
problems. Resume the test run.
Performing test run of the outdoor unit
• Press the TEST RUN button on the outdoor unit’s control board for more than 1 second.
• If you want to cancel after performing the test run, press the TEST RUN button again for more than 1 second.
• Perform test run for each outdoor unit and check that all indoor units connected by the refrigerant piping are
also performing the test run. Ensure that the refrigerant piping system and the electrical wiring system are
the same.
Performing trial operation of the indoor unit
• For the test run method, read the installation instruction manual for the indoor unit and Infrared receiver
controller (sold separately).
• Perform test run for each indoor unit and check that the refrigerant piping system and the electrical wiring
system are the same.
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