Honeywell RTH230B Thermostat Installation Guide
2.3.1 2-wire Heating
2.4 Setting J2 Jumper
The jumper defines the fan operation when the fan is placed in auto-
matic mode.
Use this setting if you have an electric furnace. In
this setting, when the fan is placed in automatic
mode, it works only when heating or cooling is
J2 jumper
HE
activated.
Heat relay
Use this setting if you have a gas or fuel oil fur-
nace. In this setting, when the fan is placed in
automatic mode, it works as follows:
2.3.2 2-wire Cooling
•
When the thermostat is placed in cool mode,
the fan works only when cooling is activated.
HG
•
When the thermostat is placed in heat mode,
the fan is controlled by the furnace fan control
circuitry.
2.5 Installing the Batteries
Cool relay
2.3.3 3-wire Heating
Pull out the battery cover.
Install the batteries as shown. Observe the polarity.
Heat relay
Reinstall the battery cover. You will hear a clicking sound.
Fan relay
After the batteries are installed, the thermostat performs a series of
tests for approximately 5 seconds.
Afterwards, the screen displays the actual
temperature. It is normal that the displayed
2.3.4 3-wire Cooling
temperature be higher than the ambient
temperature if you are holding the thermo-
stat. The thermostat will display the ambient temperature once it is
installed on the wall. By default, the setpoint is 70°F (21°C).
2.6 Completing the Installation
Cool relay
Fan relay
2.3.5 4-wire Heating and Cooling
Once the baseplate and the batteries are installed, mount the
thermostat on the baseplate.
Heat relay
Cool relay
Secure the thermostat using the locking screw and install the
faceplate.
Apply power back to the system.
Fan relay
3. Basic Functions
2.3.6 5-wire Heating and Cooling
3.1 System Operating Mode
Use the selector switch to place the system in Heating
mode (HEAT) or Cooling mode (COOL), or to set the
system off.
Fan relay
Note: When you place the thermostat in Cooling mode, you might need to
wait up to five minutes before cooling can start. This is a safety feature for
the compressor.
will flash on the screen until cooling can start again.
Heat relay
Cool relay
RTH230B
69-1800—03 03-11 2/4
| General | Details |
|---|---|
| Name | Honeywell RTH230B Thermostat Installation Guide |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.46 MB |
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