will not operate if the wires have been connected incorrectly, so that current will not flow to the
control circuit board. This is designed principally to eliminate human error at the installation
site.
Prevention of connection errors
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 power supply 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,
connnect them correctly. Normal operation should then commence.
- Do not short the remote control 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.
NOTE:
- Wait one minute after turning on the indoor unit power supply
before operating the remote control.
- If nothing at all appears in the remote control LCD, check the
power supply for the indoor unit. / Refer to “TROUBLE
SHOOTING”.
NOTE:
Never do any of the following, as doing so may damage the printed circuit board.
- Do not connect anything except a relay to the timer input or fan
speed output (connector CNT1 on printed circuit board).
- Do not connect U-NET transmission wires to terminals 3 and 4 of
the indoor and outdoor units. (*1)
- 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
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