Automatic Operation - Daikin FTXS09HVJU Service Manual

SiUS04-904
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1.5

Automatic Operation

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 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 temperature
Explanation of
2. Main unit setting temperature equals remote controller setting temperature.
the Function
3. Mode switching points are as follows.
4. During initial operation
Function and Control
63ºF (17.2ºC)
Zone B
Y
Zone A = Thermostat OFF
(64 to 96°F / 18 ~ 35°C ).
Heating  Cooling switching point:
Room temperature  Main unit setting temperature + 4.5°F (2.5°C) deg.
Cooling  Heating switching point:
Room temperature < Main unit setting temperature – 4.5°F (2.5°C) 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
– 
64ºF (17.8ºC) X
Zone C = Thermostat ON
– 
X 0.9ºF(0.5ºC) =
63ºF(17.2ºC)
3.6ºF (2.0ºC)

Y + 0.9ºF(0.5ºC)
Z
Zone B
+ Δ0.90ºF (0.5ºC)
(R6972)
Main Functions
or
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