SiUS041829E Main Functions
Part 4 Functions and Control 29
1.7 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
Refer to Temperature Control on page 23 for details.
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 thermistor temperat
ure – target temperature
(R24032)
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