Honeywell RTH8500 Wi-Fi Series Thermostat User Guide
System setup
How do I set my heating/cooling system type? (See page 20 for instructions.)
Function
Settings & Options
1
2
4
Heat/cool: Gas, oil or electric heating with central air conditioning.
Heat pump: Heat pump without backup or auxiliary heat.
Heat only with fan: Gas, oil or electric heat without central air
conditioning.
Heat only (no fan): Gas, oil or hot water heat without central air
conditioning.
Select System
Type
If you are not sure of
your heating/cooling
system type or have
other questions,
go to
0170
5
6
7
8
Cool only: Central air conditioning only.
Heat pump: Heat pump with backup or auxiliary heating.
Heat/Cool Multiple stages: 2 heat stages (wires on W and W2), 2
cooling stages (wires on Y and Y2).
wifithermostat.com
9
Heat/Cool Multiple stages: 2 heat stages (wires on W and W2), 1
cooling stage (wire on Y).
10 Heat/Cool Multiple stages: 1 heat stage (wire on W), 2 cooling stages
(wires on Y and Y2).
How do I customize my heating/cooling system? (See page 20 for instructions.)
Function
Settings & Options
Note: Depending on system settings, functions on this page might not appear.
0
1
Gas or oil heat: Use this setting if you have a gas or oil heating system
(system controls fan operation).
Electric heat: Use this setting if you have an electric heating system
Heating Fan
Control
0180
(thermostat controls fan operation).
0
1
Cooling changeover valve: Use this setting if you connected a wire
labeled “O” to the O/B terminal.
Heating changeover valve: Use this setting if you connected a wire
Heat Pump
0190
Changeover Valve
(for heat pumps
only)
labeled “B” to the O/B terminal.
5
9
3
Gas or oil furnace: Standard gas/oil furnace (less than 90% efficiency).
Electric furnace: Electric heating systems.
Hot water or high-efficiency furnace: Hot water system or gas furnace
(more than 90% efficiency).
Gas/oil steam or gravity system: Steam or gravity heat systems.
Heating Cycle
Rate
0240
0250
Heating Cycle
Rate Stage 2
1
What other functions can I change? (See page 20 for instructions.)
Function
Settings & Options
0
1
Backlight off, then on for approximately 8 seconds after keypress.
Backlight always on low intensity, full bright after keypress.
Backlight
0280
0
1
Manual changeover (Heat/Cool/Off).
Manual/Auto
Changeover
See page 20 for
more information.
0300
Automatic changeover (Heat/Cool/Auto/Off). Automatically turns on Heat
or Cool based on room temperature. Note: System maintains minimum
3°F difference between heat and cool settings.
0
1
Fahrenheit
Celsius
Temperature
Format (°F/°C)
0320
0330
0
1
Off
On
Automatic Daylight
Saving Time
Adjustment
33-00133EF—01
22
| General | Details |
|---|---|
| Name | Honeywell RTH8500 Wi-Fi Series Thermostat User Guide |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 1.23 MB |
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