Mitsubishi City Multi PURY-P400 Service Handbook page 123

Checking
code
6607 No ACK error
(continued)
System
Generating Display of
compo-
unit address trouble
sition
1 Outdoor Remote
unit (OC) control-
ler (RC)
2 BC Remote
controller control-
<master> ler (RC)
(BC)
3 BC
Remote
controller control-
<slave> ler (RC)
(BS)
4 Indoor
Remote
unit (IC) control-
ler (RC)
5 Remote
Remote
controller control-
(RC) ler (RC)
Meaning, detecting method
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).
Detecting
method
No reply Same as that for single refrigerant system.
(ACK) at
OC
transmis-
sion to BC
No replay Same as that for single refrigerant system.
(ACK) at
BC <master>
transmis-
sion to IC
No reply Same as that for single refrigerant system.
(ACK) at
BC <slave>
transmis-
sion to BC
<master>
No reply 1) Cause of 1) ~ 5) "Cause for single refriger-
(ACK) at IC ant system".
transmis- 2) Disconnection or short circuit of transmission
sion to RC line of OC terminal block for centralized con-
trol (TB7).
3) Shut down of OC unit power source in one
refrigerant system.
4) Neglecting to insert OC unit power supply
connector (CN40).
5) Inserting more than 2 sets of power supply
connector (CN40) for centralized control use.
For generation after normal operation conduct-
ed once, the following causes can be suspected.
• Total capacity error
• Capacity code setting error
• Connecting set number error
• Address setting error
No reply 1) Cause of 1) ~ 3) "Cause for single refri- gerant
(ACK) at system".
RC 2) Disconnection or short circuit of transmission
transmis- line of OC terminal block for centralized con-
sion to IC trol (TB7).
3) Shut down of OC unit power source of one
Cause
(7100)
(7101)
(7102)
(7105)
–122–
Checking method & countermeasure
Same as measure for single refrigerant
system.
Same as measure for single refrigerant
system.
Same as measure for single refrigerant
system.
a) Shut down both OC and IC power
sources simultaneously for 5 minutes
or longer and then switch on again.
It will return to the normal state in an
accidental case.
b) Check 1) through 5) for the causes of
the problem. Remedy the problem if
found.
c) Check other remote controller or OC
unit LED for troubleshooting.
→ Correct the problem
Trouble
according to the con-
tent of check code.
No trouble → Faulty indoor con-
troller
a) Shut down the power source of OC
for over 5 minute, and then switch on
again.
Normal state will be returned in case
of accidental trouble.
b) Check 1) through 5) for the causes of
the problem. Remedy the problem if
found. When the normal state cannot
be restored, check for 1) ~ 5) for the
cause.