11-4
CONTROL SYSTEM
SM HDDHED 2-A.1 GB
11.3 Cool Mode
If RAT≥SPT-0.5, the unit starts cooling operation. In this case, the compressor and outdoor fan will
operate and the indoor fan will run at the setting speed.
If RAT≤SPT-2, the compressor will stop operation and the outdoor fan will delay 30 seconds to
stop. While the indoor fan will run at the setting speed.
If SPT-2＜RAT＜SPT, the unit will maintain the previous status.
IFAN
OFAN
ON OFF ON
ON
COMP
OFF
ON OFF ON OFF
>=3min>=6min >=6min
SPT
SPT-2
RAT
30 s 30 s
11.3.1 Indoor Fan operation under Cool Mode
When SPT-RAT<0, if indoor fan motor operates at high speed, the fan motor will operate at medium
speed. The medium speed or low speed will be maintained; (this condition should be executed when
compressor starts up); this function will be excluded in the super high speed; When (RAT-SPT) ≥1 ,
the fan will return to the setting fan speed.
In AutoFan user setting, fan speed will be adjusted automatically according to the SPT and RAT,
rerfer to 12.1.4
11.4 Heat Mode
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.
IFAN
OFAN
ON OFF ON
Set Speed
COMP
OFF
ON OFF ON OFF
>=3min>=6min >=6min
SPT+5
SPT+3
RAT
30s 30s
ON
RV
Set Speed
Anti-cold function
Max 3 min
60s 60s
11.4.1 Temperature Compensation
3 degrees are reduced from room temperature reading (except when in I-Feel mode), to
compensate for temperature difference between high and low areas in the heated room, and for
coil heat radiation on room thermistor.
11.4.2 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
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