1. The main power is turned on while the transmission
wires between the indoor unit and the outdoor unit are
not connected (open circuit at section A)
Symptom:
Operation of indoor unit No. 1 and indoor unit No. 3 is
possible.
However, “CHECK” flashes in the remote control display
for 3-5 minutes after the main power is turned on.
−
− −
− Remote control... “CHECK” flashes
−
− −
− Indoor unit No. 2... LED2 on the printed circuit board
flashes (both master and slave units)
−
− −
− Outdoor unit No. 2... LED3 and LED7 on the printed
circuit board flash
2. The main power is turned on while the power supply
wires between the indoor units are not connected (open
circuit at section B)
Symptom:
Operation of indoor unit No. 1 and indoor unit No. 3 is
possible
However, if operation is then started in this condition,
the combination of the 28BB outdoor unit and the
14BB4 indoor unit (master unit) will result in abnormal
operation of indoor unit No. 2.
↓
If operation continues, an abnormality will occur on the
refrigeration cycle and operation will stop
−
− −
− Remote control... “CHECK” flashes (indoor unit No.
2 abnormality)
−
− −
− Indoor unit No. 2... LED2 on the printed circuit board
flashes (both master and slave units)
−
− −
− Outdoor unit No. 2... The LEDs on the printed circuit
board flash
3. The main power is turned on while the remote control
connection cord is not connected (open circuit at section
C)
Symptom:
Nothing abnormal appears on the remote control
display, and operation of indoor unit. No. 1 and indoor
unit No. 2 is possible.
However, indoor unit No. 3 cannot be operated.
•
• •
• Remedy
1. Turn off the main power.
↓
2. Connect the disconnected wires correctly.
↓
3. Turn on the main power.
↓
4. After 1 minute, start the operation using the remote
control.
(Indoor units’ operation will start according to the remote
control setting.)
(Outdoor units’ operation will start after 3-5 minutes.)
If slave units do not operate even after the wiring has been
corrected (automatic addressing is not possible)
1. Check that DIP switches 1 to 4 and DIP switch 8 are all
set to OFF, and then stop operation.
↓
2. Press the “AIRSWING AUTO”, “OPERATION” and “A/C
No.” buttons simultaneously.
The addresses will be momentarily reset, and then
automatic address setting will be carried out once more.
The above procedure cannot be used to carry out automatic
address resetting of twin/triple control.
(Note on automatic address setting)
The printed circuit boards automatically store the connected
system configuration when power is supplied. As a result,
once the power has been turned on for these printed circuit
boards, the units can not be changed about within the
system, even if the units are of the same model and have
same capacity.
56
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