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7.1.2.3 Heating Mode
7.1.2.3.1 Heating Conditions and Process
When T
T
+1 , the unit will run under heating mode, in which case the valve, compressor, outdoor fan and
amb.
preset
indoor fan will run at preset speed under preset cold air prevention conditions.
If T
T
+3 , the compressor and outdoor fan will be stopped, the valve is still energized and the indoor fan will
amb.
preset
run at low speed.
When T
+1 <T
preset
amb.
Under heating mode, the temperature can be set from 16 to 30 .
If the unit is switched off under heating mode or switched from heating mode to another mode, the 4-way valve will
be de-energized 2 minutes after the compressor is stopped.
7.1.2.3.2 Defrosting Conditions and Process
When the condenser is detected to have frost, the system will enter into defrosting status and the guide louver will be
adjusted to level position. The auxiliary heater (if any) will be stopped firstly. After 1-minute lag, the compressor, indoor fan
and outdoor fan will be stopped. After 3 seconds, the 4-way valve will be closed. Thirty seconds after the 4-way valve is
closed, the compressor will be started and the defrosting begin. Upon completion of defrosting, the compressor will be
stopped and the 4-way valve will be energized. After 30 seconds, the compressor and outdoor fan will be started and the
indoor fan will run under cold air prevention mode.
7.1.2.3.3 Liquid Splash Protection
1.
When the unit is put into heating mode for the first time or it is switched to heating mode from another mode, the
4-way valve will be energized and the indoor fan will run under cold air prevention mode 20 seconds after the
compressor and outdoor fan are started. If the unit is switched off under heating mode or switched from heating
mode to another mode, the 4-way valve will be de-energized 2 minutes after the compressor is stopped.
2.
When the compressor is started for the first time, the exhaust temperature protection will be shielded for 1 minute.
7.1.2.3.4 Cold Air Prevention Condition
The indoor unit will firstly adjust the guide louver to level, while the indoor fan will run at low speed.
1.
When up to UNIT ON temperature, the compressor will be started, the indoor unit will run at low speed and the guide
louver will remain at level position. After 30 seconds, the indoor unit will be switched to preset fan speed and the
guide louver will run as preset.
2.
When lower than UNIT ON temperature, the guide louver will remain at level position and the indoor unit will run at
low speed.
7.1.2.4 Fan Mode
Indoor fan will run at preset speed
The temperature can be set within a range from 16 to 30 .
7.1.2.5 Auto Mode
Under this mode, the system will automatically select the run mode (cooling, dehumidifying, heating and fan) depending
on the ambient temperature. Protection function is the same as under cooling and heating mode.
Thirty-second delay is provided for switching between different modes. (Every 30 seconds the system will detect if to
switch the mode).
< T
+3 , the unit will maintain its original operating status.
preset
T
+3
preset
T
+1
preset
T
amb
Compress
Outdoor fan
Preset speed
Indoor fan
Switchover valve
Auto Speed
3 min.
6 min.
Low speed
Preset speed
Stop
Run
Low Speed
17
Start cooling
Maintain
original
operating status
Stop cooling
6 min.
Medium Speed
High Speed
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