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Mitsubishi Electric PURY-P72 Service Handbook page 150

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1-
[VII Control]
2. Communication circuit failure or when some of the outdoor units are turned off
This is a temporary operation mode in which the outdoor unit that is not in trouble operates when communication circuit failure
occurs or when some of the outdoor units are turned off.
(1) Starting the emergency operation (When the OC is in trouble)
1) When an error occurs, the error source and the error code appear on the display on the remote controller.
2) Reset the error via the remote controller to start an emergency operation.
Precautions before servicing the unit
-When the OC is in trouble, the OS temporarily takes over the OC's function and performs an emergency operation. When this
happens, the indoor unit connection information are changed.
-In a system that has a billing function, a message indicating that the billing system information has an error may appear on
the TG-2000A. Even if this message appears, do not change (or set) the refrigerant system information on the TG-2000A.
After the completion of an emergency operation, the correct connection information will be restored.
(2) Starting the emergency operation (When the OS is in trouble)
1)
A communication error occurs. ->
An
emergency operation starts in approximately six minutes.
Error codes that permit an emergency operation (Applicable to both OC and OS)
Trouble source
Error codes that pennit an
Error code description
emeroencv ooeration
Circuit board failure or the power
6607
No acknowledaement error
to the outdoor units is off
6608
No response error
Emergency operation pattern (2 outdoor units)
OCfailure
OSfailUle
pattern
pattern
OC
Trouble Nonnal
as
Normal
Trouble
Emergency Cooling
Permilled Permilled
operation
Heating Permilled Permilled
Maximum total capacity Capadty
that
matches
of indoor units (Note
1)
the
total
capacity
of the
operable outdoor units
Note
I
1) If an attempt is made to put into operation a group of indoor units whose total capacity exceeds the maximum allowable ca·
pacity, some of the indoor units will go into the same condition as Thermo-OFF.
(3) Ending the emergency operation
When communication is restored, the emergency mode is cancelled, and the units go into the normal operation mode.
HWE0803A
·140 -
GB
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