30
12.4. Thermostat Control
• Depending on differences between room temperature and setting temperature, compressor operation is decided and starts
operation.
• If temperature difference matches values shown below, thermostat switches off.
12.5. Indoor Fan Control
12.5.1. Manual Fan Speed
• Fan operation can be set using remote control.
• The indoor fan is operated at High, Medium or Low speed according to remote control setting.
12.5.2. Auto Fan Speed
• According to room temperature and setting temperature, indoor fan speed is determined automatically.
• The indoor fan will operate according to pattern below.
12.5.3. Feedback Control
• Immediately after the fan motor is started, feedback control is performed once every second.
• During fan motor on, if fan motor feedback 2550 rpm or <50 rpm continuously for 10 seconds, the fan motor error counter
increased; fan motor is then stopped and restarted. If the fan motor error counter increased to 7, then fan motor error is detected.
Operation stopped and could not be restarted.
12.6. Outdoor Fan Operation
• Outdoor fan speed changes according to outdoor pipe temperature.
• The fan speed is controlled by the timing of turning the outdoor fan ON and OFF within an interval.
• There unit compares current temperature (T2) with previous (2 seconds before) temperature (T1) and decides the outdoor fan
ON time (X).
Outdoor fan ON time (X) is a variable with the range of 200ms to 1600ms or continuosly ON.
• Every 2 minutes, the outdoor pipe temperature is detected and the outdoor unit fan speed is changed automatically.
Cooling 0C
Soft Dry -1.0C
Judgement Outdoor fan ON time (X)
45C T2 X = X + 100ms
40C T2 45C & T2 T1
X = X + 50ms
40C T2 45C & T2 T1
X = X
35C T2 40C
X = X
30C T2 35C & T2 T1
X = X - 50ms
30C T2 35C & T2 T1
X = X
T2 30C X = X - 50ms
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