Honeywell Home T6 Pro Smart Professional Install Manual page 13

# ISU ISU Name ISU Options (defaults in bold)
255 Aux Heat Type Electric, Gas/Oil (or Fossil Forced Air)
256 EM Heat Type Electric, Gas/Oil (or Fossil Forced Air)
260 Fossil Kit Control Thermostat, External (Fossil Fuel Kit Controls Backup
Heat)
300 Auto Changeover On, Off
303 Auto Differential 0 °F to 5 °F or 0.0 °C to 2.5 °C
305 High Cool Stage Yes, No
Finish
306 High Heat Stage Yes, No
Finish
340 Aux Heat Droop 0 = Comfort; 2 °F to 15 °F from setpoint (in 1 °F incre-
ments) or 1.0 °C to 7.5 °C from setpoint (in 0.5 °C increments)
350 Up Stage Timer Aux Off, 30, 45, 60, 75, 90 minutes
Heat 2, 3, 4, 5, 6, 8, 10, 12, 14, 16 hours
Notes
This ISU is displayed only if ISU 200 is set to heat pump AND if ISU 221 Aux/E heat stages = 1.
Note: Options of this ISU may vary depending on the model of the thermostat.
This ISU is displayed only if ISU 200 is set to Heat Pump AND if ISU 221 Aux/E heat stages = 1 AND if ISU 253
is set to run AUX/E heat separately.
Note: This ISU may not be available at all on some models.
This ISU is displayed only if ISU 200 is set to Heat Pump AND if ISU 221 Aux/E heat stages = 1, AND if ISU 256
is set to Gas/Oil.
Note: This ISU available on TH6320 model only.
OFF: The user must select heating or cooling as needed to maintain the desired
indoor temperature.
ON (Automatic): On (enabled) Allows user to select Auto Changeover as one of the system modes from
the home screen. In auto mode, the thermostat can control either heating or cooling to maintain the desired
indoor temperature.
Differential is the minimum number of degrees rise or fall required during off cycle to switch from the last
active mode (heat or cool) to the opposite mode when the thermostat is in auto-changeover. Differential is
NOT deadband. The deadband temperature between when heating (or cooling) cycles on and cycles off to
maintain setpoint is not adjustable. The thermostat uses an algorithm that fixes deadband at 0 °F (0 ° C).
This ISU is only displayed when the thermostat is set to 2 cool stages. When set to YES, this feature keeps the
higher stage of the cooling equipment running until the desired setpoint is reached.
This ISU is only displayed when the thermostat is set to 2 or more heat stages. When set to YES, this feature
keeps the higher stage of the heating equipment running until the desired setpoint is reached.
Aux heat droop can be set on heat pump systems with an auxiliary heat stage. The Comfort setting is NOT
available for Dual Fuel systems. Default setting is 0 °F (0 ° C) (Comfort) for Electric while 2 °F (1.0 °C) for Gas/
Oil. The indoor temperature must drop to the selected droop setting before the thermostat will turn Aux Heat
on. For example, if Aux Heat is set to 2 °F (1.0 °C), the indoor temperature must be 2 ° F (1.0 ° C) away from the
setpoint before Aux Heat turns on. When set to Comfort, the thermostat will use Aux Heat as needed to keep
the indoor temperature within 1 °F (0.5 ° C) degree of the setpoint.
The Auxiliary Heat Upstage Timer starts when the highest stage of the previous heating equipment type turns
on. Auxiliary heat will be used (if needed) when the timer expires. This ISU is only displayed when ISU 340 (AUX
Heat Droop) is set to 2 °F (1.0 °C) or higher.