–124–
Checking
code
6607
(continued)
Meaning, detecting method
System
compo-
sition
Generating
unit address
Display of
trouble
Detecting
method
Cause Checking method & countermeasure
No ACK error When no-ACK signal is detected 6 consecutive intervals of 30 seconds by
transmission side controller, the transmission side detects error.
Note: The address/attribute shown on remote controller indicates that
the controller is not sending acknowledgement signals (ACK).
(3) Connecting system with system controller (MELANS)
5 System
controller
(SC)
Address
that should
not exist
Remote
controller
(RC)
-
Problem with partial remote controller:
1) Faulty wiring of RC transmission line.
2) Disconnection or poor contact of RC trans-
mission connector.
3) Faulty RC.
Problem with all IC 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) Disconnection or short circuit of transmission
line of OC unit terminal block for central con-
trol (TB7).
3) Power source shut down of OC unit.
4) Trouble of OC unit electrical system.
Problem with all RC:
1) Same as that for single refrigerant system.
2) Inserting supply power connector (CN40) to
OC transmission line for centralized control.
3) Disconnection or power shutdown of power
supply unit for transmission line.
4) Faulty MELANS.
1) 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 regis-
tration with SC.
2) IC unit is keeping the memory of the original
interlocking registration with Fresh Master with
RC, although the Fresh Master address was
changed later.
No reply
(ACK) at
SC
transmis-
sion to IC
-
Check 1) ~ 3) on the left.
Confirm OC trouble diagnosis LED.
→ During fault generation, check the
LED check codes.
Check the content of 2) ~ 4) shown left.
Check the causes 1)~4) left.
Delete addresses that do not have a cor-
responding unit. Employ one of the fol-
lowing two deleting methods.
1) Deletion by remote controller.
Delete unnecessary information by
the manual setting function of remote
controller.
2) Deletion by connecting information
deleting switch of OC unit.
Note: That the use of this method
will delete all the group in-
formation set with RC and
all the interlocking informa-
tion of Fresh Master and IC
unit.
1 Shut down OC unit power source,
and wait for 5 minutes.
2 Turn on the dip switch SW2-2 pro-
vided on OC unit control circuit
board.
3 Turn on OC unit power source,
and wait for 5 minutes.
4 Shut down OC unit power source,
and wait for 5 minutes.
5 Turn off the dip switch SW2-2 pro-
vided on OC unit control circuit
board.
6 Make OC unit power source.
No relation with system
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