49 PB
OPERATION
Unit Function
• Cooling-run mode
Outdoor Fan
The outdoor fan’s speeds except the single speed motor can be
changed according to outdoor ambient temperatures.
When operating at a fixed frequency, the outdoor fan is forced to
operate at the high speed.
Indoor fan
(1) When the indoor fan is running, this operation state could be
controlled by the remote control with High, Medium, Low and
Automatic setting.
(2) When the appliance is set to the automatic condition in the Cool
mode for the first time, the fan speed will run at Low setting. After
that, temperature and fan speed will run as shown in figure 303.
When the difference between the setting temperature and the room
temperature is between 3.6˚F and 7.2˚F, the indoor fan speed will
keep the current speed.
Air flow direction control
The louver is controlled by a step motor, and it swings the horizontal louver automatically. Press the SWING button to swing or stop the
louver.
During the louver swing in normal operation, the current position will be stored. When the appliance turns off and louver swing
automatically to the default position, it will position at the close position plus 5º.
Reversing valve
State: Power is removed for cooling
Switchover: When initially powered on for cooling, the reversing valve is interrupted immediately.
When the heating is changed to the cooling, it needs an interval of 50 seconds for the reversing valve to change over from being activated to
being interrupted.
• Heating-run mode
Temperature compensation
The temperature compensation is 5º in heating mode. For example, if the set temperature is 77°F by the remote control, when the room
temperature is detected with 88°F, the compressor will turn off. The main reason is that the hot air is condensed at the top of the building.
Note: The compensation is available only if the room temperature sensor of indoor unit is used and it is not available when it is subject to the
sensor on the remote control.
Indoor fan motor operation
Anti-cold air system:
When the appliance runs in Heat mode condition, the indoor fan motor operation is shown as following to prevent cold air from blowing out
of the unit. Refer to figure 304.
When the anti-cold air system is activated by the system logic during
compressor operation, the louver swings to the cold air protection
position. The louver recovers to the original position after the air
volume change to LOW. When the room temperature reaches the
setting temperature, the compressor will turn off, and the air flow
changes to LOW, the louver swings to the cold air protective position
to prevent the air drop into human body directly. When the indoor
pipe coil temperature drops continuously, it will turn on the cold air
protective system in Extra-LOW or stop the fan motor.
The indoor fan motor is only controlled by the signal of indoor pipe
coil temperature, regardless of compressor run status (ON/OFF),
even during first heat mode sequence.
The indoor fan motor will operate according to the different settings
(High, Median, Low and Automatic) by the remote control, but the
anti-cold air system has priority.
When the unit runs in the heat mode with the automatic setting at
first time, the fan speed will be in the LOW setting. Refer to Figure
304.
When the difference between the setting temperature and the room
temperature between 3.6˚F and 7.2˚F, the indoor fan speed will keep
in current speed. Refer to figure 305.
7.2ºF
3.6°F
Figure 303
95ºF
86°F
77°F
Figure 304
Low
High
The setting temperature 3.6˚F
MEDIAN
The setting temperature 7.2˚F
Figure 305
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