Mitsubishi Electric PFAV-P250VM-E Service Manual page 109

[ VIII 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
Circuit board failure or the power
to the outdoor units is off
The full capacity is not available during emergency operation. (The available capacity depends on the number of outdoor units
in trouble.)
Emergency operation pattern (2 outdoor units)
(3) Ending the emergency operation
When communication is restored, the emergency mode is cancelled, and the units go into the normal operation mode.
-14- Operation Mode
(1) Indoor unit operation mode
The operation mode can be selected from the following 4 modes using the remote controller.
1 Cooling mode
2 Heating mode
3 Fan mode
4 Stopping mode
(2) Outdoor unit operation mode
1 Cooling mode
2 Heating mode
3 Stopping mode
When the outdoor unit is performing a cooling operation, the operation mode of the connected indoor units that are not in the
cooling mode (Stopped, Fan, Thermo-OFF) cannot be changed to heating from the remote controller. If this attempt is mode,
"Heating" will flash on the remote controller. The opposite is true when the outdoor unit is performing a heating operation. (The
first selection has the priority.)
HWE10190
Error codes that permit an
emergency operation
6607
6608
OC operation
status
OC Trouble
OS Normal
Cooling
Emergency
Permitted Permitted
operation
Heating
Permitted Permitted
Maximum total capacity
of indoor units
All indoor units in operation are in cooling mode.
All indoor units in operation are in heating mode.
All indoor units are in fan mode or stopping mode.
- 100 -
Error code description
No acknowledgement error
No response error
OS operation
status
Normal
Trouble
100%
GB