Daikin RXL25G2V1B, Service Manual

Page: 39 / 294

SiENBE04-925_A Main Functions
Function and Control 25
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 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
1. The set temperature (Ts) determines the target temperature (Tt).
(Ts = 18 ~ 30°C).
2. The target temperature (Tt) is calculated as;
Tt = Ts + C
where C is the correction value
.
C = 0°C
3. Thermostat ON/OFF point and mode switching point are as follows.
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.
4. During initial operation
Tr
≥
Ts: Cooling operation
Tr < Ts: Heating operation
Ex: When the target temperature is 25°C
Cooling
→
23°C: Thermostat OFF
→
22°C: Switch to heating
Heating
→
26.5°C: Thermostat OFF
→
27.5°C: Switch to cooling
(R11893)
Target tempe 2.5°C
Heating Operation
Target temperature – 2.5°C
Cooling Operation
Target tempe 1.5°C
= Thermostat OFF
Target temperature – 2.0°C
= Thermostat OFF
SIENBE04-925_A_FRONT.pdf 39 24/02/2011 13:53:51