DuctlessAire DA1221-H2-I, Service Manual

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7.3 Main Protection
7.3.1 Three minutes delay at restart for
compressor
1 minute delay for the 1
st
time stand-up and 3
minutes delay for others.
7.3.2 Temperature protection of compressor top
The unit will stop working when the compressor
top temp. protector cuts off, and will restart after
the compressor top temp. protector restarts.
7.3.3 Temperature protection of compressor
discharge
Compressor discharge temp. T5>115˚C for 5s,
compressor stops.
7.3.4 Fan speed is out of control
When indoor fan speed keeps too low (300RPM) for
certain time, the unit will stop and the LED will
display the failure.
7.3.5 Inverter module protection
The Inverter module has a protection function about
current, voltage and temperature. If these
protections happen, the corresponding code will
display on indoor unit and the unit will stop working.
7.3.6 Indoor fan delayed open function
When the unit starts up, the louver will be active
immediately and the indoor fan will open 7sec. later.
If the unit runs in heating mode, the indoor fan will
be also controlled by anti-cold wind function.
7.3.7 Compressor preheating functions
Preheating permitting condition:
When T4(outdoor ambient temperature)
＜
3˚C, the
preheating function will be activated.
7.3.8 Sensor protection at open circuit and
breaking disconnection.
When there’s only one temperature sensor in
malfunction, the air conditioner will keep working
but show the error code, in case of any emergency
use.
When there’s more than one temperature sensor in
malfunction, the air conditioner will stop working.
7.3.9 Refrigerant leakage detection
This function is only active in cooling mode. It can better
prevent the compressor from being damaged by
refrigerant leakage or compressor overload.
Open condition:
When compressor is active, the value of the Coil
temperature of evaporator T2 has no change or very little
change.