BAS-SVX44A-EN 45
Other Functional Components
Extension of Fan-on Time
The system fan-on time is able to be extended for either or both cooling or heating mode. For
cooling, the extension time is 90 seconds and for heating it is 40 seconds (refer to 0270 and 0271).
Economizer/Time of Day (TOD)
You can set the Economizer or TOD mode using Option Number #150 to one of two settings:
• Economizer Mode - Terminal A is energized with the thermostat in Occupied mode,
Unoccupied mode with a call for cool, or a Temporary Override mode (TOV) active.
• TOD Mode - Terminal A is energized with thermostat in Occupied mode or a Temporary
Override mode (TOV) active.
Note: TOD is not available in non-programming mode.
The table below summarizes the bulleted statements.
Configuration, Time, and Programming Retention
The thermostat retains the time and date for a minimum of 5 days of loss power. If power is lost
for more than 5 days, the time and date will need to be restored when power is returned. All
configuration settings, system settings, and scheduling are stored in non-volatile memory which
will retain the data indefinitely with/without power
Note: The user can manually reset the thermostat to all default settings by changing Configuration
Option Number 0300 to 1.
Heat/Cool Relay Confirmation
As a guard against inadvertent relay switching, the thermostat firmware will set/reset the output
relays every half hour if the relationship of setpoint versus temperature is out of range as follows:
• Auto systems with cool/heat setpoints: temperature is 5°F (2.5°C) above the cool setpoint or 5°F
(2.5°C) below the heat setpoint
• Only heat systems: temperature is above or below the heat setpoint by 5°F (2.5°C)
• Only cool systems: temperature is above or below the cool setpoint by 5°F (2.5°C)
Deadband
The thermostat automatically maintains a temperature deadband between the heating setpoint
and the cooling setpoint whenever the thermostat is configured for heat and cool– this applies to
Auto or manual H/C setup. The temperature range of the deadband is 2°F to 9°F (1.0°C to 4.5°C) and
is specified in the installation Configuration Option 0181 (see “Configuration Option Setup,” p. 23).
If attempting to change a temperature setpoint to within the deadband of its opposing setpoint, the
opposing setpoint will automatically be pushed to the next value that satisfies the deadband.
Table 10. Operation summary
Occupancy Call for Cool Terminal A (Programmable Mode)
Terminal A (Non-programmable
Mode)
Economizer TOD Economizer TOD
Occupied Don’t Care Energized Energized NA NA
Unoccupied YES Energized De-energized Energized NA
Unoccupied NO De-energized De-energized De-energized NA
Temporary Override Don’t Care Energized Energized NA NA
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