Checking
code
Meaning, detecting method
No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission
side controller, the transmission side detects error.
Note: The address/attribute shown on remote controller indicates the controller not
providing the answer (ACK).
Generating
unit address
Display of
trouble Detecting
method
No reply
(ACK) at
transmission
of IC to SC
–
Remote
controller
(RC)
–
System
compo-
sition
4System
controller
(SC)
Address
which
should not
be exist-ed
6607
(continued)
Trouble of partial remote controller:
1) Faulty wiring of RC transmission line
2) Slipping off or poor contact of RC transmis-
sion connector.
3) Faulty RC
Trouble of all ICs in one refrigerant system
1) Error detected by OC unit
Total capacity error (7100)
Capacity code setting error(7101)
Connecting number error (7102)
Address setting error (7105)
2) Slipping off or short circuit of transmission
line of OC unit terminal block for central
control (TB7).
3) Power source shut down of OC unit
4) Trouble of OC unit electrical system
Trouble of all RC:
1) Cause of 1) ~ 7) of (b)
2) Inserting supply power connector (CN40)
to
OC transmission line for centralized control
3) Slipping off or power shutdown of power
supply unit for transmission line
4) Faulty MELANS
IC unit is keeping the memory of the original
group setting with RC although the RC ad-
dress was changed later.
The same symptom will appear for the re-
gistration with SC.
Check 1) ~ 3) left.
a) Confirm OC trouble diagnosis LED
→At trouble generation, check for
the content according to check
code.
→At no trouble, follow b).
b) Check the content of 2) ~ 4) shown
left.
Check the causes 1)~4) left.
As some IC units are keeping the me-
mory of the address not existing,
delete the information.
Employ one of the deleting method
among two below.
1) Deletion by remote controller
Delete unnecessary information by
the manual setting function of re-
mote controller.
2)Deletion by connecting inform-
ation deleting switch of OC unit
Be careful that the use of this
method will delete all the group
information set with RC and all
the interlocking information of IC
unit.
1
Shut down OC unit power source,
and wait for 5 minutes.
2Turn on the dip switch SW2-2
provided on OC unit control cir-
cuit board.
3Make OC unit power source, and
wait for 5 minutes.
4
Shut down OC unit power source,
and wait for 5 minutes.
5Turn off the dip switch SW2-2
provided on OC unit control cir-
cuit board.
6Make OC unit power source.
(3) Connecting system with system controller (MELANS)
No relation with system
Cause Checking method & countermeasure
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80
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