Heating Operation; Heating Capacity Control - Fujitsu AU A36LCLU Series Service Instruction

1-2. HEATING OPERATION

1-2-1 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.
The maximum frequency is limited in the range shown in Figure 2 based on the outdoor temperature.
.
If the room temperature is lower 3 °C than a set temperature,
the compressor operation frequency will attain to maximum frequency.
.
If the room temperature is higher 2.5 °C than a set temperature, the compressor
will be stopped.
.
When the room temperature is between +2.5 °C to -3 °C of the setting temperature,
the compressor frequency is controlled within the range shown in Table 2.
( Table 2 : Compressor Frequency Range )
AO *D36LATT
AO *D45LATT
AO *D54LATT
AO *D60LATT
*
Compressor is 4 pole type.
Therefore, [Hz] is described by the twice the value of [rps]
( Fig 2 : Limit of Maximum Frequency based on Outdoor Temperature )
Outdoor air
temperature
19°C
14°C
When the room
temperature rises
DC indoor unit
connection
AC indoor unit
connection
(High static pressure)
Minimum Maximum
frequency frequency
36Hz
160Hz
36Hz
170Hz
36Hz
170Hz
36Hz
170Hz
A zone
B zone
C zone
When the room
temperature drops
Fan speed mode
HIGH
A ~ C zone
AO *D36LATT
AO *D45LATT A ~ C zone
A ~ C zone
AO *D54LATT
A ~ C zone
AO *D36LATT
A ~ C zone
AO *D45LATT
AO *D54LATT A ~ C zone
A ~ C zone
AO *D60LATT
17°C
12°C
[ Hz ]
MED LOW QU
160 130 108
92
170 132 112 100
170 150 124
114
130 120
108
170 140 128
170 156 144
170 168 156
01-02