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Reference to display screen
LCD indicators Function
Day of week indicator
Display day of week
Clock display
Display clock, time and other
information
Temperature display
Displays room-temp, set-temp and
other information
Temperature scale indicator
“°C” for Celsius / “°F” for Fahrenheit
Program indicator
Indicates that the thermostat is ope-
rating in Program mode and display
the setting
Comfort indicator
Indicates that the current set-temp
is Comfort
Econ indicator
Indicates that the current set-temp
is Econ
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LCD indicators Function
Defrost mode indicator
Indicates that the current set-temp
is Defrost
Setback indicator
Indicates that the current set-temp
is Setback
Heat mode indicator
Indicates the thermostat is operating
in heat mode
Cool mode indicator
Indicates operating in cool mode/ A
rotating fan animate if cooling is turn
on/ Outside circle and center dot ash
in o mode
Program override indicator
Indicates program is overridden
Lobat indicator
Indicates battery is low
Technical Characteristics
Pulse Width Modulation (PWM)
ST201 o ers Pulse width modulation control that enables a set point temperature to be
maintained in a precise and convenient way. In the case of under oor heating, the du-
ration of opening for the valve actuator is regulated by comparing continuously the set
point temperature with the actual temperature. In this way, the room temperature can
reach the set temperature with minimal temperature deviation. Subsequently, the room
temperature is constantly maintained via the PWM control. In the case of ST201 is used
with radiator or convector heating system, PWM can be switched o if necessary.
Setback Temperature
ST201 has setback temperature function. Once the setback button is activated, the set
point temperature is 3 °C or 6 °F lower than the Econ set-temp. For example, if the Econ
set-temp is at 22 °C, then the setback temperature is 19 °C. Press green button to toggle
between normal set-temperature and setback function, icon
will ash and animate
as below to indicate that the setback function is activated.