Honeywell rth230b User Manual download pdf (Page 3)

RTH230B 69-1800 2/6/05 3/4

3.2 Fan Operating Mode

Use the selector switch to set the fan to automatic

mode (AUTO) or continuous mode (ON).

Note: This switch is not used if you have a 2-wire

installation as the fan is not connected to the thermo-

stat.

3.3 Displaying the Temperature

The actual temperature is normally displayed. To view the setpoint,

press once on one of the buttons. The setpoint is displayed for

5 seconds along with the icon.

Note: Pressing either of the buttons more than once will

change the setpoint.

3.4 Setting the Temperature

Press one of the buttons until the desired temperature is dis-

played.

3.5 Thermostat Control Mode

3.5.1 Manual/Permanent Hold Mode

Maintains the temperature at a fixed setpoint. To place the thermo-

stat in this mode, press [ Mode ]. The house icon will disappear.

3.5.2 Programmable Mode

Maintains the temperature according to the energy-saving sched-

ule. To place the thermostat in this mode, press [ Mode ]. The cur-

rent period will be displayed. The four possible periods are:

To see the default settings of each period, see section 5.2.

Temporary Bypass

If you modify the temperature (using the buttons) when the

thermostat is in programmable mode, the new temperature will be

used for the next 2 hours. The house icon flashes during the

bypass. At the end of the bypass period, the thermostat returns to

the temperature settings of the period currently underway.

3.6 Filter Replacement Indicator

After 500 hours of operation, an icon appears to indi-

cate that the filter needs replacement. Once the filter

is replaced, press [Filter] for 3 seconds to remove

the icon and reset the counter.

3.7 Battery Replacement Indicator

An icon appears when the batteries need replacement.

This icon will flash for 120 days, then the thermostat

will cut power to the heating/cooling unit. The icon dis-

appears once the batteries are replaced.

After replacing the batteries, readjust the time and day (see section

5.1). However, the temperature and program settings are saved and

do not need to be re-entered.

Warning: Before removing the batteries, place the

system switch on the thermostat to Off. Otherwise, the

heating/cooling unit might still be running even after

the batteries are removed.

n To access the configuration menu, press both buttons

simultaneously for 3 seconds.

o To go to the next parameter (menu item), briefly press both

buttons simultaneously.

p To modify a parameter, press one of the buttons.

q Repeat steps 2 and 3 if necessary.

r Press both buttons simultaneously for 3 seconds to exit

the configuration menu.

5.1 Setting the Time and Day

n Press [ Clk ]. The hour flashes.

o Set the hour using .

p Press [ Clk ]. The minutes flash.

q Set the minutes using .

r Press [ Clk ]. The day flashes.

s Set the day using .

t Press [ Exit ] to exit.

AUTO

• If you have an electric furnace (see section 2.4), the fan

works only when heating or cooling is activated.

• If you have a gas or fuel oil furnace (see section 2.4), the fan

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.

ON The fan is always on.

Wake up Leave for work Return home Sleep

4. Configuration Menu

DISPLAY DESCRIPTION DEFAULT OPTIONS

Temperature display °F °C or °F

Time display 12 h 12 h or 24 h

Early Start

Off On or Off

Heating cycles per hour

2, 3, 4, 5 or 6

Cooling cycles per hour

2, 3, 4, 5 or 6

When Early Start is On, the thermostat determines when to start heating

or cooling so that the desired temperature is reached at the set time.

When either the heating or cooling parameter is displayed, use the sys-

tem mode selector switch to alternate between the two parameters.

For optimal heating control, use the setting that matches your system as

follows: 2=30 min (steam, gravity), 3=20 min (hot water, 90%+ high-effi-

ciency furnace), 4=15 min (gas or oil), 5=12 min (alternate setting for gas

or oil), 6=10 min (electric).

The corresponding cooling cycle lengths are as follows: 2=30 min,

3=20 min, 4=15 min, 5=12 min, 6=10 min

5. Programming

1 2 3 4

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Honeywell rth230b User Manual Page 3

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