Mitsubishi Electric PURY-80TMU Service Handbook page 105

Checking
code
6607 No ACK error
(continued)
System
Generating Display of
compo-
unit address trouble
sition
5 System
Remote
controller controller
(SC) (RC)
Address -
which
should not
be existed
Meaning, detecting method
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).
Detecting
method
No reply Trouble of partial remote controller:
(ACK) at 1) Faulty wiring of RC transmission line.
transmis- 2) Disconnection of or poor contact of RC trans-
sion of IC mission connector.
to SC 3) Faulty RC.
Trouble of all IC in one refrigerant system.
1) Error detected by OC unit.
Total capacity error
Capacity code setting error
Connecting number error
Address setting error
2) Disconnection of or short circuit of transmis-
sion 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) Disconnection of 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.
Cause
(7100)
(7101)
(7102)
(7105)
–104–
Checking method & countermeasure
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.
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 Make 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.