- Do not connect U-NET transmission wires to terminals A and B of the remote control. / (*1) U-NET
transmission wires are the communication wires used for the central controller.
21. TEST OPERATION AND SELF DIAGNOSIS
21.1. 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. / (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.)
21.2. Test operation from the outdoor unit
(Outdoor unit printed circuit board)
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