CONTROL SYSTEMS
For model 18 and 24
If RAT≤SPT+3.5, the unit will operate in heating mode. The compressor, outdoor fan and 4-way
valve will operate and the indoor fan will delay 3min to start at the latest
If SPT+3≤RAT≤SPT+5,the unit will maintain the previous status.
If RAT≥SPT+5, the compressor will stop, the outdoor fan will delay 30s to stop and the indoor fan
will blow for 60s at the setting speed. During this period, the fan speed can’t be switched.
RAT
SPT+5
SPT+3
>=6min
>=3min
>=6min
COMP
ON OFF
ON
OFF
OFAN
IFAN
ON
Set
Speed
30s
60s
OFF
ON
Anti-cold
function
Max 3
min
Set
Speed
30s
60s
OFF
RV
ON
12.4.1 Indoor Fan Control in Heat Mode
Indoor fan speed depends on the indoor coil temperature
Anti-cold air function
When starting the heating mode, anti-cold air function will be activated and indoor fan can run at low
speed or stop running. This function will terminate after the unit runs for 3min or the ICT reaches 42
degree.
Residual heat blowing function
During heating, when the stopping condition for the compressor is reached, the compressor and the
outdoor fan motor stop running while the louver moves to position L. The indoor fan will stop after
running for 60s at setting speed.
12.5 Auto Cool/Heat Mode
In AUTO mode, the system selects the running mode (COOL/HEAT/FAN) automatically according
to the room temperature. The display shows the actual running mode and setting temperature.
There will be 30s delay for mode conversion.
1. When
RAT≥25
o
C, the cooling mode is selected.
2. When
RAT≤22
o
C, the unit runs in heating mode
3. When 22
o
C <RAT< 25
o
C, upon initial startup, the unit will enter auto mode and run in automatic
fan mode. If the other mode changes into auto mode, the previous running mode will remain.
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