- 115 -
Checking
code
Meaning, detecting method
System
com-
position
Cause
Cause checking method &
Countermeasure
Generating
unit
address
Display of
trouble
Detecting
method
6607
(continued)
When no ACK signal is detected in 6 continuous times with 30 seconds
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).
No ACK abnormality
3. Remote
controller
(RC)
No reply
(ACK) at
transmission
of IC to RC
No reply
(ACK) at
transmission
of MELANS
to RC
Remote
controller
(RC)
Same cause as that for plural re-
frigerant system.
Trouble of partial IC units:
(1) Same cause of that for single
refrigerant system.
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) Disconnection 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 IC:
(1) As same that for single
refrigerant system.
(2) When using the power
supply unit for transmission
line, the power supply
connector (CN40) is inserted
into the transmission line for
centralized control.
(3) Disconnection or power
shutdown of power supply
unit for transmission line.
(4) Faulty MELANS.
Same countermeasure as that for
plural refrigerant system.
→
Same countermeasure as that for
single refrigerant system.
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 of (1) ~ (4) left.
(3) Connecting system with contr
oller (MELANS)
