Automatic Operation - Daikin CTX Series Service Manual

Main Functions
1.6

Automatic Operation

Automatic Cooling / Heating Function (Heat Pump Only)
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.
Details
1. Remote controller setting temperature is set as automatic cooling / heating setting
Explanation of
2. Main unit setting temperature equals remote controller setting temperature.
the Function
3. Operation ON / OFF point and mode switching point are as follows.
4. During initial operation
Ex : When the set temperature is 25°C (77°F),
Scenario 1 Thermostat OFF  23.5°C (74.3°F). If room temperature continues to drop to
Scenario 2 Room temperature maintains at 25°C (77°F) :
Scenario 3 Thermostat OFF -> 26.5°C (79.7°F). If room temperature continues to increase to
26
temperature 16°C (60°F) to 30°C (86°F).
a Heating  Cooling switching point:
≥
Room temperature Main unit setting temperature +2.5 deg (+4.5°F).
b Cooling  Heating switching point:
Room temperature < Main unit setting temperature -2.5 deg (-4.5°F)
c 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
Set point -1.5°C (-2.7°F)
=Thermostat OFF
Set point -2.5°C (-4.5°F)
22.5°C (72.5°F) :

Switch from Cooling Operation to Heating Operation

No Switch in Operation mode
27.5°C (81.5°F) :

Switch from Heating Operation to Cooling Operation
Cooling Operation
Heating Operation
DAMA-SM-21-003
Set point +2.5°C (+4.5°F)
Set point +1.5°C (+2.7°F)
=Thermostat OFF
Functions and Control