Outline of Control (Indoor Unit) SiUS281811EA
126 Part 4 Functions and Control
Suction air thermistor (∗1) is used for temperatures from 23°C (73°F) to 18°C (64°F) (B → A).
∗1. For FTQ: Remote sensor (Optional accessory)
6.2 Thermostat Control
6.2.1 Without Optional Infrared Presence/Floor Sensor
Whether the thermostat is turned ON or OFF is determined by the difference between the remote
controller set temperature and the actual detected room temperature (∗1).
• Normal operation
· Cooling operation
· Heating operation
• Dry operation
· When Tro < 24.5°C (76.1°F)
· When Tro ≥ 24.5°C (76.1°F)
• FTQ-TA only
If the field setting 14(24)-5 is set to 02, Tro will be the same as the cooling set temperature.
∗1: The thermistor for room temperature detection depends on the field setting 10 (20)-2.
∗2: Description of symbols
ΔT = Detected room temperature – Remote controller set temperature
Tro: Detected room temperature at the start of dry operation
Tr: Determined by the room temperature detected by the thermistor
Thermostat OFF
Normal operation
(Thermostat ON)
ΔT ≤ –1.0˚C (–1.8˚F)
ΔT ≥ +1.0˚C (+1.8˚F)
Thermostat OFF
Normal operation
(Thermostat ON)
ΔT ≥ +1.0˚C (+1.8˚F)
ΔT ≤ –1.0˚C (–1.8˚F)
Thermostat OFF
Dry operation
Tr < Tro – 1.0˚C (–1.8˚F)
Tr > Tro + 1.0˚C (+1.8˚F)
Thermostat OFF
Dry operation
Tr < Tro – 1.5˚C (–2.7˚F)
Tr > Tro + 1.5˚C (+2.7˚F)
Thermostat OFF
Dry operation
Tr < Tro – 1.0˚C (–1.8˚F)
Tr > Tro + 1.0˚C (+1.8˚F)
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