15
Installer setup options (ISU) – advanced menu
Table 2.
# ISU ISU Name 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.
260 Fossil Kit Control Thermostat, External (Fossil 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
is set to Gas/Oil.
300 Auto Changeover On, Off 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 control either heating or cooling automatically to maintain the
desired indoor temperature.
303 Auto Differential 0 °F to 5 °F or 0.0 °C to 2.5 °C Differential is NOT deadband. Honeywell uses an advanced algorithm that fixes deadband at 0 °F. The differ-
ential setting is the minimum number of degrees from set-point needed to switch from the last mode running
(heat or cool) to the opposite mode when the thermostat is in auto-changeover. This is more advanced than
previous thermostats.
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 °F to 15 °F from setpoint (in 1 °F increments)
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 while 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 °F to 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 the heat pump and run Aux Heat only. This ISU is only displayed if ISU 130 = Wired, ISU 200 is set to
Heat Pump, ISU 221 Aux/E stages = 1, AND ISU 260 is set to Thermostat. 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).
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