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9
RTH8500 Series
System Setup options
Number Description Options (factory default in bold)
120 Scheduling Options
0 = NonProgrammable
1 = 1Week Programmable
2 = 5-2 Programmable
3 = 511 Programmable
4 = 7Day Programmable
Note: You can change default MOFR, SASU schedule here. To edit periods during days,
temperature setpoints, or to turn Schedule On/Off, touch MENU and go to SCHEDULE.
125
Temperature Indication
Scale
0 = Fahrenheit
1 = Celsius
200 Heating System Type
1 = Conventional Forced Air Heat
2 = Heat Pump
3 = Radiant Heat (Boiler)
5 = None (Cool Only)
Note: This option selects the basic system type your thermostat will control.
205
Heating Equipment
Type
Conventional Forced Air Heat:
1 = Standard Efficiency Gas Forced Air
2 = High Efficiency Gas Forced Air
3 = Oil Forced Air
4 = Electric Forced Air
5 = Hot Water Fan Coil
Heat Pump:
7 = Air to Air Heat Pump
8 = Geothermal
Radiant Heat:
9 = Hot Water Radiant Heat
12 = Steam
Note: This option selects the equipment type your thermostat will control. Note: This feature is
NOT displayed if feature 200 is set to Cool Only.
218 Reversing Valve O/B
0 = O (O/B in Cool)
1 = B (O/B in Heat)
Note: This option is only displayed if the Heat Pump configured. Select whether reversing valve
O/B should energize in cool or in heat.
220
Cool Stages /
Compressor Stages
200=Conv / 200=HP
0, 1, 2
Note: Select how many Cool or Compressor stages of your equipment the thermostat will
control. Maximum of 2 Cool/Compressor Stages. Set value to 0 if you do not have Cool Stage/
Compressor Stage.
221
Heat Stages / Backup
Heat Stages Heat
Stages
Heat Stages: 1, 2
Backup Heat Stages: 0, 1
Note: Select how many Heat or Aux/E stages of your equipment the thermostat will control.
Maximum of 2 Heat Stages for conventional systems. Maximum of 1 Aux/E stage for systems
with more than 1 heating equipment type. Set value to 0 if you do not have Heat Stage/Backup
Heat Stage.
230 Fan Control
1 = Equipment
2 = Thermostat
Note: This ISU is only displayed if ISU 205 is set to Electric Forced Air or Fan Coil.
300 System Changeover
0 = Manual
1 = Automatic
Note: Thermostat can automatically control both heating and cooling to maintain the desired
indoor temperature. To be able to select “automatic” system mode on thermostat home screen,
turn this feature ON. Turn OFF if you want to control heating or cooling manually.
303 Auto Differential
0 °F to 5 °F or 0.0 °C to 2.5 °C
Note: 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
Home uses an algorithm that fixes deadband at 0 °F.
To access all system options in the table below, press and hold MENU for 5 seconds.
Touch
or
to scroll through the list.
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