Heating Operation; Heating Capacity Control - Fujitsu AR 18LUAD Series Service Instruction

5-2. HEATING OPERATION

5-2-1 HEATING CAPACITY CONTROL

A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is lower 3 degC than a set temperature,
the compressor operation frequency will attain to maximum performance.
* If the room temperature is higher 2 degC than a set temperature, the compressor
will be stopped.
* When the room temperature is between +2 degC to -3 degC of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.
However, the maximum frequency is limited in the range shown in Figure 2 based on
the outdoor temperature.
( Table 2 : Compressor Frequency Range )
AR*18LUAD
AR*24LUAN
AR*30LUAN
AR*36LUAN
AR*45LUAN
AR*45LUAK
AR*54LUAK
( Fig.2 : Limit of Maximum Frequency based on Outdoor Temperature )
Outdoor air
temperature
16°C
12°C
minimum maximum
frequency frequency
15Hz 62Hz
15Hz 75Hz
20Hz 95Hz
20Hz 95Hz
20Hz 92Hz
20Hz 92Hz
C zone
AR*18LUAD
B zone
AR*24LUAN
A zone
AR*30LUAN
AR*36LUAN
AR*45LUAN
AR*45LUAK
AR*54LUAK
Limit of Maximum
Frequency
A zone 62Hz
B zone 62Hz
C zone 62Hz
A zone 75Hz
B zone 75Hz
C zone 75Hz
A zone 95Hz
B zone 90Hz
C zone 80Hz
A zone 95Hz
90Hz
B zone
C zone 80Hz
A zone 92Hz
B zone 90Hz
C zone 80Hz
A zone 92Hz
B zone 90Hz
C zone 80Hz
05-02