CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series Functions
SiUS121630EA
48
Functions and Control
CDXS, FDXS, 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 Condition
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
CTXG series
Target tempe 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 tempe 1.5˚C (+2.7˚F)
= Thermostat OFF
Zone B
Zone B
Zone A
Zone A
OFF
OFF
ON
ON
Zone C
Zone 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 B
Zone A
OFF
ON
Zone C
1.5˚C (2.7˚F)
0.5˚C (0.9˚F)
0˚C (0˚F)
1.0˚C (1.8˚F)
Room thermistor temperature – target temperature
(R24032)
