Honeywell rth230b User Manual download pdf (Page 2)

RTH230B 69-1800 2/6/05 2/4

2.3.1 2-wire Heating

2.3.2 2-wire Cooling

2.3.3 3-wire Heating

2.3.4 3-wire Cooling

2.3.5 4-wire Heating and Cooling

2.3.6 5-wire Heating and Cooling

2.4 Setting J2 Jumper

The jumper defines the fan operation when the fan is placed in auto-

matic mode.

2.5 Installing the Batteries

n Pull out the battery cover.

o Install the batteries as shown. Observe the polarity.

p Reinstall the battery cover. You will hear a clicking sound.

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

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

n Once the baseplate and the batteries are installed, mount the

thermostat on the baseplate.

o Secure the thermostat using the locking screw and install the

faceplate.

p Apply power back to the system.

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.

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

Fan relay

Heat relay

Cool relay

Fan relay

Heat relay

Cool relay

Fan relay

Cool relay

Heat relay

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

activated.

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:

• When the thermostat is placed in cool mode,

the fan works only when cooling is activated.

• When the thermostat is placed in heat mode,

the fan is controlled by the furnace fan control

circuitry.

3. Basic Functions

J2 jumper

1 2 3 4

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Honeywell rth230b User Manual Page 2

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