Automatic Operation - Daikin FTXS20G2V1B Service Manual

Main Functions
1.5

Automatic Operation

Outline Automatic Cooling / Heating Function
When the AUTO mode is selected with the remote control, the microcomputer automatically
determines the operation mode as cooling or heating according to the room temperature and
the set temperature at start-up, and automatically operates in that mode.
The unit automatically switches the operation mode to maintain the room temperature at the set
temperature.
Detail
1. The set temperature (Ts) determines the target temperature (Tt).
2. The target temperature (Tt) is calculated as;
3. Thermostat ON/OFF point and mode switching point are as follows.
4. During initial operation
Ex: When the target temperature is 25°C
35
Ts: set temperature (set by remote control)
Tt: target temperature (determined by microcomputer)
Tr: room thermistor temperature (detected by room temperature thermistor)
C: correction value
(Ts = 18 ~ 30°C).
Tt = Ts + C
where C is the correction value
C = 0°C
Tr means the room thermistor temperature.
1 Heating → Cooling switching point:
Tr ≥ Tt + 2.5°C
2 Cooling → Heating switching point:
Tr < Tt – 2.5°C
3 Thermostat ON/OFF point is the same as the ON/OFF point of cooling or heating
operation.
Tr ≥ Ts: Cooling operation
Tr < Ts: Heating operation
Target temperature – 2.0°C
= Thermostat OFF
Target temperature – 2.5°C
Cooling → 23°C: Thermostat OFF → 22°C: Switch to heating
Heating → 26.5°C: Thermostat OFF → 27.5°C: Switch to cooling
.
Cooling Operation
Target temperature + 2.5°C
Heating Operation
SiENBE04-808_A
Target temperature + 1.5°C
= Thermostat OFF
Function and Control
(R11893)