20
ELECTRONIC FUNCTION
Main Protection
Three Minute Delay for Compressor Restart
Less than a one minute delay for the first time start−up and a three
minute delay for subsequent start−ups.
Compressor Top Temperature Protection
The unit stops working when the compressor top temp. protector
cuts off, and restarts after the compressor top temp. protector
restarts.
Compressor Discharge Temperature Protection
Compressor discharge temp. T5>239_F(115_C) for 5s, compressor
stops.
Fan Speed is out of Control
When the indoor fan speed remains too low (300RPM) for a
certain time, the unit stops and the LED displays the failure.
Inverter Module Protection
The inverter module has a protection function for the current,
voltage and temperature. If these protections trigger, the
corresponding code displays on the indoor unit and the unit stops
working.
Indoor Fan Delayed Open Function
When the unit starts up, the louver becomes active immediately
and the indoor fan open 10 seconds later. If the unit runs in the
HEATING mode, the anti−cold wind function will control the
indoor fan.
Compressor Preheating Functions
Preheating Permitting Condition:
When T4 (outdoor ambient temperature)<37.4
_F(3_C), the
preheating function activates.
Sensor Protection at Open Circuit and Breaking Disconnection
When there is only one malfunctioning temperature sensor, the air
conditioner keeps working however displays a error code, in case
of any emergency use. When there is more than one
malfunctioning temperature sensor, the air conditioner stops
working.
Operation Modes and Functions
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
Fig. 17 – Auto Fan
Cooling Mode
Compressor Running Rules
When T1−Ts<28.4_F(−2_C), the compressor stops, when
T1—TS>31.1
_F(−0.5_C), the compressor activates. When the AC
runs in the MUTE mode, the compressor runs with low a
frequency. When the current is more than setting value, the current
protection function activates, and the compressor stops.
Outdoor Fan Running Rules
The outdoor unit runs at a different fan speed according to T4. For
different outdoor units, the fan speeds differ.
T4
A+
A
B
C
D
E
Fig. 18 – Outdoor Fan Running Rules
Condenser Temperature Protection
T3
Resume
Off
Decrease
Hold
Fig. 19 – Condenser Temperature Protection
When the condenser temperature temp. is more than setting value,
the compressor stops.
Evaporator Temperature Protection
When the evaporator temperature temp. is less than the setting
value, the compressor stops.
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