Mitsubishi Electric PURY-P200 Service Handbook page 144

Checking
code
No ACK abnormality
6607
(continued)
System Generating
Display of
com- unit
trouble
position address
1. Outdoor Remote
unit(OC) controller
(RC)
2. BC M-NET
controller remote
(BC) controller
(RC)
System
controller
(SC)
MA remote
controller
(MA)
3. Indoor Remote
unit (IC) controller
(RC)
Meaning, detecting method
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).
Detecting
Cause
method
No reply
As same that for single
(ACK) at BC refrigerant system.
transmission
to OC
No reply As same that for single
(ACK) at IC refrigerant system.
transmission
to BC
No reply Trouble of partial IC units :
(ACK) at (1) Same cause as that for
transmission single refrigerant system.
of SC to IC
Trouble of all IC in one refriger-
ant system:
(1) Cause of total capacity error.
(7100)
(2) Cause of capacity code
setting error. (7101)
(3) Cause of connecting number
error. (7102)
(4) Cause of address setting
error. (7105)
(5) Disconnection or short circuit
of transmission line of OC
unit terminal block for central
control (TB7).
(6) Power source shut down of
OC unit.
(7) 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
source shut down of power
supply unit for transmission
line.
(4) Faulty system controller
(MELANS).
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Cause checking method &
Countermeasure
Same countermeasure as that for
single refrigerant system.
Same countermeasure as that for
single 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 (5) ~ (7) shown
left.
Confirm voltage of transmission line for
centralized control.
• More than 20V → Confirm (1) (2) left.
• Less than 20V → Confirm (3) left.