Mitsubishi SCM80ZA Manual page 35

(n) Serial transmission abnormality protection
An abnormal stop is made if the outdoor unit does not receive serial signal commands, other than "Stop: 0 Hz," from all the
indoor controllers continuously for 1 minute and 55 seconds when the compressor is operating at an outdoor frequency of
other than 0 Hz. At the same time, LED 5 on the printed circuit board for the outdoor unit will flash 6 times at a 0.5 second
interval every 8 seconds. (The timer lamp on the indoor unit will flash 6 times.)
The unit can be restarted if serial signal is restored and/or the 3-minute delay has finished.
(o) Stop mode : When the decision frequency is 0 Hz; during switching mode, during protection function
operation.
Functional
Operation
components
Decision frequency
Outdoor unit
frequency
0 Hz
According to Hz
Outdoor unit fan
OFF
4-Way valve
ON
(20S)
OFF
EEV
control
EEVA
Fully
closed
EEVB
Operated
successively
EEV
EEVC
control
Fully
closed
EEVD
If stopped by indoor unit control. If permanent stop.
Heating
2 minutes 55 seconds 2 minutes 55 seconds
2 minutes
2 minutes
200 Pulse
2 minutes
25seconds
200 Pulse
Stopped All stopped Stopped
(0 Hz command) (0 Hz command)
If stopped by outdoor protection function. If restarted by operation switching.
Cooling Heating
55
seconds
2 minutes
200 Pulse
200 Pulse
2 minutes 2 minutes
25seconds 25seconds
200 Pulse 200 Pulse
All stopped Stopped
(0 Hz command)
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Cooling
55 seconds
2 minutes
200 Pulse
2 minutes
25seconds
200 Pulse
Restart Stopped Restart
(0 Hz command)
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