Tadiran Telecom TAD2U18MOU Installation Manual page 14

INSTALLATION INSTRUCTIONS
Step 3 - Installation of the Outdoor Unit (Cont.)
D. Wiring Error Check
• This unit is capable of automatically checking for wiring errors
between the indoor and outdoor units.
• To enter the wiring error check test, place all 4 DIP switches of
the test board to the ON position. (Illustration 6) Remove and
reapply power to the unit, the system will enter the operation
of "Wiring Error Check".
• The numeric display will initialize and begin to alternate
between the compressor working frequency (a number
representing the Hz value) and "CH" (Checking).
• As the check is being performed, all units that are properly
connected will be indicated by the corresponding LED for that
circuit being lit constantly. (LED 1 = piping circuit A, LED 2 =
piping circuit B, ...)
• After the check has completed, if all wiring is correct,
the numeric display will indicate "0" and the single LEDs
representing the individual circuits for the connected indoor
units will be lit constantly.
• If there are any miswired units, the numeric display will flash
"EC" (error connection), and th corresponding LED for the
miswired circuit will flash. Check and correct the wiring as
needed.
LED 1 2
ALL Flashing
Status
ON Flashing
ON Flashing
Only one LED flashing
Model
TAD4U36MOU
Connection priority
between indoor and
service valve higher
from down to up.
When there are 2
indoors, the prior
service valves are
When there are 3
indoors, the prior
service valves are
When there are 4
indoors, the prior
service valves are
NOTE: For better oil return and more reliable system, please execute as the above when connecting indoor unit.
31-5000001 Rev. 1
3 4 5
OFF
ALL ON
Flashing ON Flashing
Flashing ON ON
Connections Cautions
D C
D C B
D C B A
• Refer to the chart shown below. (Table 2)
• When the test is complete, remove power to the system and
return the 4 DIP switches to the OFF position. Reapply power
to the the system. The test is complete.
• If the self-check is not possible, check the indoor unit wiring
and piping in the usual manner.
Message
Unit not connected
Automatic chekcing impossible, all units connected wrong
All units connected correctly
ON: unit connected correctly
Flashing: unit connected wrong, need to change the wiring manually
between 2, 3, and 5
ON: unit connected correctly
Flashing: unit connected wrong, need to change the wiring manually
between 2 and 3
TAD3U24MOU TAD2U18MOU
A
B
C
C B B A
C B A
/
A
B
/
/
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