Service Manual

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8.3 Main Protection
8.3.1 Three minutes delay at restart for
compressor
1 minute delay for the 1
st
time stand-up and 3
minutes delay for others.
8.3.2 Temperature protection of compressor
top
The unit will stop working when the compressor
top temp. protector cut off, and will restart after
the compressor top temp. protector restart.
8.3.3 Temperature protection of compressor
discharge
Compressor discharge temp. T5>115℃ for 5s,
compressor stops.
8.3.4 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
8.3.5 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.
8.3.6 Indoor fan delayed open function
When the unit starts up, the louver will be active
immediately and the indoor fan will open 7s
later.
If the unit runs in heating mode, the indoor fan
will be also controlled by anti-cold wind
function.
8.3.7 Compressor preheating functions
Preheating permitting condition:
When T4(outdoor ambient temperature)＜3°C,
the preheating function will be activated.
8.3.8 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.
8.4 Operation Modes and Functions
8.4.1 Fan mode
(1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled,
and no setting temperature is displayed.
(3) Indoor fan can be set to
high/med/low/auto.
(4) The louver operates same as in cooling
mode.
(5) Auto fan:
a
b
c
d
T1
e
8.4.2 Cooling Mode
8.4.2.1 Compressor running rules
When T1-Ts< T -2℃, the compressor will stop,
when T1—Ts > T -0.5℃，the compressor will
be activated.
 T is the programmed parameter of
temperature compensation.
When the AC run in mute mode, the
compressor will run with low frequency.
When the current is more than setting value,
the current protection function will be activated,
and the compressor will stop.
8.4.2.2 Outdoor fan running rules
The outdoor unit will be run at different fan
speed according to T4.
For different outdoor units, the fan speeds are
different.