Automatic Operation - Daikin 2MXS-N Series Service Manual

SiUS121502E
1.6

Automatic Operation

Outline Automatic Cooling / Heating Function
When the automatic operation 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.
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 operation mode switching point are as follows.
4. During initial operation
CTXS, FTXS series
Target temperature – 2.0˚C (–3.6˚F)
= Thermostat OFF
Target temperature – 3.0˚C (–5.4˚F)
Ex: When the target temperature is 25°C (77°F)
CDXS, FDXS, FVXS series
Target temperature – 2.0˚C (–3.6˚F)
= Thermostat OFF
Target temperature – 3.0˚C (–5.4˚F)
Ex: When the target temperature is 25°C (77°F)
Function and Control
Ts: set temperature (set by remote controller)
Tt: target temperature (determined by microcomputer)
Tr: room thermistor temperature (detected by room temperature thermistor)
C: correction value
(Ts = 18 ~ 30°C, 64.4 ~ 86°F).
Tt = Ts + C
where C is the correction value
C = 0°C (0°F)
(1) Heating → Cooling switching point:
Tr ≥ Tt + 3.0°C (+5.4°F) (CTXS, FTXS series)
Tr ≥ Tt + 2.5°C (+4.5°F) (CDXS, FDXS, FVXS series)
(2) Cooling → Heating switching point:
Tr < Tt – 3.0°C (–5.4°F)
(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
Cooling → 23°C (73.4°F): Thermostat OFF → 22°C (71.6°F): Switch to heating
Heating → 27°C (80.6°F): Thermostat OFF → 28°C (82.4°F): Switch to cooling
Cooling → 23°C (73.4°F): Thermostat OFF → 22°C (71.6°F): Switch to heating
Heating → 26.5°C (79.7°F): Thermostat OFF → 27.5°C (81.5°F): Switch to cooling
Function of CTXS, FTXS, CDXS, FDXS, FVXS Series
.
Cooling Operation
Target temperature + 3.0˚C (+5.4˚F)
Target temperature + 2.0˚C (+3.6˚F)
= Thermostat OFF
Heating Operation
Cooling Operation
Target temperature + 2.5˚C (+4.5˚F)
Target temperature + 1.5˚C (+2.7˚F)
= Thermostat OFF
Heating Operation
(R21862)
(R22000)
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