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and from cold to hot. You can set the heat to cool day on a date between 1 March and 31 May. You
can set the cool to heat day on a date between 1 September and 30 November. You can configure
the heat to cool day and cool to heat day in the system configuration settings menu.
Setting the pipe state manually
If you did not install a pipe sensor and calendar based switching is not available, you can configure
the pipe state manually.
Press Mode to set the thermostat to OFF mode.
1.
2.
Press and hold Mode and Fan for 5 seconds to access the advanced settings menu.
Press Up to navigate to SS, then press Mode to enter the menu.
3.
Alternatively, you can access the pipe state menu directly when the thermostat is in OFF mode.
To do this press and hold Fan and Up for 5 seconds.
4.
Press Mode to navigate to 31.
5.
Use the Up and Down buttons to set the pipe state value and press Mode to confirm the
change.
Auto deadband
The Auto deadband is the threshold above and below the set temperature to determine the auto
change-over line, and to start the control model to switch from heat mode to cool mode or from
cool mode to heat mode. Auto deadband is available only if the control mode is heat and cool with
auto. The default Auto deadband value is 4.0°F (2.22°C). You can configure the Auto deadband value
to 2.0°F (1.11°C), 3.0°F (1.67°C), 4.0°F (2.22°C), or 5.0°F (2.78°C) in the installer configuration settings
menu.
Auto changeover mode
In auto changeover mode, the control algorithm checks the ambient temperature with the heat and
cool temperature for every control cycle.
• If the ambient temperature is higher than the changeover line for cool mode, it switches the
control mode to COOL.
• If the ambient temperature is lower than the changeover line for heat mode, it switches the
control mode to HEAT.
• If the ambient temperature is in between:
- Cool set temperature – Auto deadband and Heat set temperature + Auto deadband, the
thermostat switches the control mode to OFF, given that Cool set temperature - Heat
set temperature is larger than two times the Auto deadband, where Auto deadband is
settable option
- Otherwise the thermostat keeps the previous control mode for temperature control
algorithm
The minimum switching duration after autochange of the control mode is 20 minutes.
Minimum off time
After load of the heating or cooling system is switched off then load does not turn on again until 5
minutes elapsed. If thermostat tries to turn on heat or cool during the minimum off time period,
the wait icon flashes. The minimum off time is disabled by default. You can enable the feature in the
installer configuration settings menu.
FCP Non-Programmable and Programmable Fan Coil or PTAC Thermostat Largo User Guide
15
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