Venstar T0051FS - Manual (Page 22)

About Advanced Features & Operation
Page 21
DUAL SETPOINT BEHAVIOR - The adjustable setpoint range
is: 35 - 99 degrees Fahrenheit and 7 - 35 degrees
Centigrade. When in the modes Heat or Cool, this
adjustable range is unhampered.
When adjusting any Auto mode, including programming
Occupied and Unoccupied periods, the thermostat will not
allow the Heat setpoint to get closer to the Cool setpoint
than the value programmed as the minimum difference in
step 16, page 16.
When entering the Auto mode from Cool, the Heat and
Cool setpoints will remain spread apart by the amount
that they were adjusted, prior to entering Auto.
For example: If the Cool setpoint was set to 80 while
in the Cool mode and the Heat setpoint was adjusted to
70 while in the Heat mode, upon entering the Auto mode
the Cool and Heat setpoints would be 80 and 70. Both
setpoints would then move up and down together, (in this
example spread by 10 degrees), by pressing the WARMER
or COOLER buttons. To move the Heat and Cool setpoints
closer together, enter the Cool or Heat mode by pressing
the Mode button, then adjust the setpoint(s) closer together.
Heat is limited to how close it can come to Cool by step 16,
page 16.
ELECTRIC HEAT - Selecting Electric Heat ON, step 13,
page 15, will cause the thermostat to turn on the fan
immediately any time there is a heat demand. Since all
gas furnaces control the fan, this feature should be off
unless the heater is only electric.