6
SYSTEM FEATURES
2 ZONE
Watchdog
There is a watchdog circuit to watch the operation of the microprocessor. If it has malfunctioned, this circuit will reset the
microprocessor automatically.
Compressor delay protection
Each time the compressor is off, there will always be a 3 minute time delay before the compressor can restart. In case of
power interruption, the system will delay the operation of the compressor in the range of 3-4 minutes in random order. This is
to
prevent more than one compressor starting at the same time as another, saving the powerboard from „overloading‟
.
Compressor minimum on time
Once the compressor starts, it will operate at least 24 seconds.
Non-volatile memory
The system keeps the setting parameters such as on/off status, fan speed, etc. in its non-volatile memory. If there is a power
interruption and back to normal, the control will automatically resume its operation with the same setting parameters
(except the sleep and timer function which will be cancelled.)
If there is any change in the parameter, it will be saved in the non-volatile memory 5 seconds later.
Freeze (Anti-ice) function
In COOL or DRY mode, there is a feature to prevent the evaporator from freezing.
Enter into Freeze process
While in Freeze process
Exit from Freeze process
T
indoor
coil < 0
o
C, and
Comp. stops, and
T
indoor
coil > 7
o
C, or
Comp. runs continuously more than 10 min.
Indoor fan at low speed, and
System OFF
There will be an alarm signal at the
Display unit.