Automatic Operation - Daikin J Series Service Manual

SiBE041012
1.6

Automatic Operation

Outline Automatic Cooling / Heating Function
When the AUTO mode is selected with the remote controller, 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 temperature set by remote controller (Tc) 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
Function and Control
Tc: temperature set by remote controller
Tt: target temperature
Tr: room temperature
C: correction value
(Tc = 18 ~ 30°C).
Tt = Tc + C
where C is the correction value
C = 0°C
Tr means the room temperature.
Heating → Cooling switching point:
Tr ≥ Tt + 3.0°C
Cooling → Heating switching point:
Tr < Tt – 2.5°C
Thermostat ON/OFF point is the same as the ON/OFF point of cooling or heating
operation.
Tr ≥ Tc: Cooling operation
Tr < Tc: 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 → 27°C: Thermostat OFF → 28°C: Switch to cooling
.
Cooling Operation
Heating Operation
Main Functions
Target temperature + 3.0˚C
Target temperature
+ 2.0˚C =
Thermostat OFF
(R11810)
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