Daikin FTX25JVEA9 Service Manual page 101

Main Functions
1.1.16 Automatic Operation (Heat Pump Only)
Automatic Cooling/Heating Function
When the AUTO mode is selected with the remote controller, the microcomputer automatically
determines the operation mode from cooling and heating according to the room temperature
and setting temperature at the time of the operation startup, and automatically operates in that
mode.
The unit automatically switches the operation mode to cooling or heating to maintain the room
temperature at the main unit setting temperature.
Detailed 1. Remote controller setting temperature is set as automatic cooling / heating setting
explanation of the
2. Main unit setting temperature equals remote controller setting temperature plus correction
function
3. Operation ON / OFF point and mode switching point are as follows.
4. During initial operation
However, in the automatic Powerful cooling/heating mode, the guard timer is set as follows to
prevent hunting in cooling / heating mode.
88
ON point
Frequency switching
point
OFF point
Compressor
control
Indoor unit fan
LHz indicates low frequency. Item marked with varies depending on models.
temperature (18 to 30°C).
value (correction value / cooling: 0 deg, heating: 2 deg.).
Heating → Cooling switching point: Room temperature ≥ Main unit setting temperature
+2.5 deg.
Cooling → Heating switching point: Room temperature < Main unit setting temperature –
2.5 deg.
Thermostat ON / OFF point is the same as the ON / OFF point of cooling or heating
operation.
Room temperature ≥ Remote controller setting temperature: Cooling operation
Room temperature < Remote controller setting temperature: Heating operation
Heating /
cooling switching point
(Heating thermostat
OFF point)
Main unit setting
temperature
(Cooling thermostat
OFF point)
Cooling /
heating switching point
0.5 C
5 min
Stop
LHz LHz
*55Hz
Stop
Extra-low air flow
Low air flow
Cooling Heating
operation operation
With compressor capacity supplied
With no compressor capacity supplied
5 min
Stop Stop
LHz
Extra-low air flow
*55Hz
Stop Stop
Low air flow
(ML047)
2.5 deg.
or higher
(1.5 deg.)
or higher
Less than
(1.5 deg.)
2.5 deg.
or higher
Cooling
operation
(RL022)
Main Functions
Si18-201