![background image](http://html2.mh-extra.com/html/daikin/ftxr-t-series/ftxr-t-series_service-manual_3655463032.webp)
Main Functions
SiUS041829E
28
Part 4 Functions and Control
1.6 Automatic Cooling/Heating Changeover
Outline
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.
Details
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
1. The set temperature (Ts) determines the target temperature (Tt).
(Ts = 18 ~ 30°C (64.4 ~ 86°F))
2. The target temperature (Tt) is calculated as;
Tt = Ts + C
where C is the correction value.
C = 0°C (0°F)
3. Thermostat ON/OFF point and operation mode switching point are as follows.
(1) Heating
Cooling switching point:
Tr
Tt + 3.0°C (+ 5.4°F)
(2) Cooling
Heating switching point:
Tr < Tt – 2.5°C (– 4.5°F)
(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 (77°F)
Cooling → 23°C (73.4°F): Thermostat OFF → 22.5°C (72.5°F): Switch to heating
Heating → 26.5°C (79.7°F): Thermostat OFF → 28°C (82.4°F): Switch to cooling
Target temperat
u
re + 3.0°C (+5.4°F)
Heating Operation
Target temperat
u
re – 2.5°C (–4.5°F)
Cooling Operation
(R24030)
Target temperat
u
re – 2.0°C (–3.6°F)
= Thermostat OFF
Target temperat
u
re + 1.5°C (+2.7°F)
= Thermostat OFF
Summary of Contents for FTXR-T Series
Page 17: ...SiUS041829E Part 2 Specifications 13 1 Specifications 14 Part 2 Specifications...
Page 125: ...SiUS041829E Check Part 6 Service Diagnosis 121 18 class R25105 1 2 3 4 Multimeter...
Page 127: ...SiUS041829E Check Part 6 Service Diagnosis 123 18 class R20704 W V U DC_P1 DC_N1...
Page 143: ...SiUS041829E Operation Limit Part 8 Appendix 139 4 Operation Limit RX09 12 18RMVJU9 3D092209E...