Honeywell RTH8500 Wifi Thermostat User Manual
RTH8500 Series
System Setup options
To access all system options in the table below, press and hold MENU for 5 seconds.
Touch or to scroll through the list.
Number
Description
Options (factory default in bold)
0 = Non-Programmable
1 = 1-Week Programmable
2 = 5-2 Programmable
3 = 5-1-1 Programmable
4 = 7-Day Programmable
120
Scheduling Options
Note: You can change default MO-FR, SA-SU schedule here. To edit periods during days,
temperature setpoints, or to turn Schedule On/Off, touch MENU and go to SCHEDULE.
Temperature Indication 0 = Fahrenheit
Scale
125
200
1 = Celsius
1 = Conventional Forced Air Heat
2 = Heat Pump
3 = Radiant Heat (Boiler)
Heating System Type
5 = None (Cool Only)
Note: This option selects the basic system type your thermostat will control.
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
Heating Equipment
Type
205
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.
0 = O (O/B in Cool)
1 = B (O/B in Heat)
218
220
Reversing Valve O/B
Note: This option is only displayed if the Heat Pump configured. Select whether reversing valve
O/B should energize in cool or in heat.
0, 1, 2
Cool Stages /
Compressor Stages
200=Conv / 200=HP
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.
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.
Heat Stages / Backup
Heat Stages Heat
Stages
221
1 = Equipment
2 = Thermostat
Note: This ISU is only displayed if ISU 205 is set to Electric Forced Air or Fan Coil.
230
300
Fan Control
0 = Manual
1 = Automatic
System Changeover
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.
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
uses an algorithm that fixes deadband at 0 °F.
303
Auto Differential
9
| General | Details |
|---|---|
| Name | Honeywell RTH8500 Wifi Thermostat User Manual |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 1.11 MB |
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