Honeywell Home Lyric T6 Pro Wi-Fi Professional Install Manual page 12

#ISU ISUName
ISU Options (defaults In bold) Notes
256
EM Heat Type Electric, Gas/Oil (or Fossil Forced Air)
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.
260
Fossil Kit Control
Thermostat, ExternaKFossil Fuel Kit Controls Backup
Heat)
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
issettoGas/()il.
Note: This ISU may not be available at all on some models.
300
Auto Changeover
On. Off
0 FF: 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.
303 Auto Differential
0°Fto5''ForO.O®Cto2.5°C
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. Honeywell uses an algorithm that fixes deadband at 0 °F.
305
High Cool Stage
Finish
Yes, No
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.
306
High Heat Stage
Finish
Yes, No
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.
340
Aux Heat Droop
0 = Comfort; 2 °Fto 15 °F fromsetpoint(in 1°F incre
ments) or 1.0 "C to 7,5 °C from setpoint (in 0.5 °C increments)
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 (Comfort) for Electric v/hile 2 °F 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 tem
perature within 1 °F (0.5 ° C) degree of the setpoint.
350
Up Stage Timer Aux
Heat
Off, 30,45,60,75,90 minutes
2,3,4,5,6,8,10,12,14,16 hours
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 or higher.
355
Balance Point
(Compressor Lockout)
Off, 5 "Fto 60 °F(in 5 "F increments) or -15.0 °C to 15.5 "C
(in 2.5 °C or 3.0 °C increments)
Compressor Lockout requires an outdoor temperature. Set Compressor Lockout to the temperature below
which it is inefficient to run the heat pump. When outside temperature is below this setting, thermostat will
lockout heat pump and run Aux Heat only. This ISU is only displayed if ISU 130 Wired or Internet, ISU 200 is
set to Heat Pump, ISU 221 Aux/E stages 1, AND ISU 260 is set to Thermostat. We recommend using a wired
remote sensor as an outdoor temperature source.
Default is 40 °F if ISU 205 Heating Equipment is Air to Air Heat Pump and ISU 255 Aux Heat Type is Gas/Oil.
Default is Off if ISU 205 Heating Equipment is Air to Air Heat Pump and ISU 255 Aux Heat Type is Electric.
Default is Off if ISU 205 Heating Equipment is Geothermal.
Compressor Lockout is optional for any type of heat pump (Air to Air Heat Pump, Geothermal Heat Pump).