–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 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).
(3) Connecting system with system controller (MELANS)
5System
controller
(SC)
Address
which
should not
be existed
Remote
controller
(RC)
-
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 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) 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) As same that for single refrigerant system.
2) Inserting supply power connector (CN40) to
OC transmission line for centralized control.
3) Slipping off or power shutdown of power sup-
ply 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) left.
Confirm OC trouble diagnosis LED.
→At trouble generation, check for the
content according to check code.
Check the content of 2) ~ 4) shown left.
Check the causes 1)~4) left.
As some IC units are keeping the
memory of the address not existing, de-
lete 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 remote
controller.
2) Deletion by connecting information
deleting switch of OC unit.
Be careful that the use of this
method will delete all the group in-
formation set with RC and all the
interlocking information of Fresh
Master and IC unit.
1Shut down OC unit power source,
and wait for 5 minutes.
2Turn on the dip switch SW2-2 pro-
vided on OC unit control circuit
board.
3Make OC unit power source, and
wait for 5 minutes.
4Shut down OC unit power source,
and wait for 5 minutes.
5Turn off the dip switch SW2-2 pro-
vided on OC unit control circuit
board.
6Make OC unit power source.
No relation with system