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SiUS121827E RA Indoor Unit Functions
Part 4 Functions and Control 67
FDXS, CDXS, FVXS Series
Ex: When the target temperature is 25°C (77°F)
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
2.5 Thermostat Control
Outline Thermostat control is based on the difference between the room thermistor temperature and the
target temperature.
Details Thermostat OFF Conditions
The temperature difference is in the zone A.
Thermostat ON Conditions
The temperature difference returns to the zone C after being in the zone A.
The system resumes from defrost control in any zones except A.
The operation turns on in any zones except A.
The monitoring time has passed while the temperature difference is in the zone B.
(Cooling: 10 minutes, Heating: 10 seconds)
Cooling
Heating
FTXR, CTXG Series
Target temperature + 2.5°C (+4.5°F)
Heating Operation
Target temperature – 3.0°C (–5.4°F)
Cooling Operation
(R22000)
Target temperature – 2.0°C (–3.6°F)
= Thermostat OFF
Target temperature + 1.5°C (+2.7°F)
= Thermostat OFF
Zone BZone B
Zone AZone A
OFFOFF
ONON
Zone CZone C
Room thermistor temperature – target temperature
–1.0°C (–1.8°F)
–2.0°C (–3.6°F)
(R24031)
–0.5°C (–0.9°F)
–1.5°C (–2.7°F)
Zone BZone B
Zone AZone A
OFFOFF
ONON
Zone CZone C
1.5°C (2.7°F)
0.5°C (0.9°F)
0°C (0°F)
1.0°C (1.8°F)
Room ther
mistor temperature – target temper
ature
(R24032)
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