TL8230A
Operating Instructions
Programmable Thermostat
TL8230A 69-1803 21/2/05 1/2
Honeywell’s TL8230A programmable thermostat can be used to
operate an electric heater to control the room temperature.
* Place the switch on OFF to disable heating. This will not affect the clock and pro-
gram settings.
** The thermostat displays the percentage of heater duty cycle required to maintain
the desired temperature. For example, if the heater is activated 40 percent of the
time, is displayed.
• To remove the control module
from its power base, loosen the
captive screw underneath the
thermostat and pull the two
halves apart as shown.
• To install the control module
onto its power base, reverse the
above procedure.
NOTE: Always keep the thermostat's vents clean and unobstructed.
You can modify some functionalities of the
thermostat via the small selector switches
on the back of the control module.
Default (factory) settings are denoted in gray:
When the thermostat is powered, it initially performs a
series of tests before displaying the actual
temperature.
When power is applied initially, the LCD displays:
0:00, MO (Monday), and temperature.
n Press the Hour and Min buttons to set the time.
o Press the Day button to set the day.
LO: The measured temperature is below 32°F (0°C).
Heating is activated.
HI: The measured temperature is above 122°F
(50°C).
When the backlight button is pressed, the display illuminates for 5
seconds. When either of the buttons is pressed, the display illu-
minates for 10 seconds during which the setpoint appears for 5 sec-
onds. The actual temperature is then displayed.
Setpoint
The thermostat generally displays the actual temperature. To view
the setpoint, press one of the buttons once or press the
backlight button. The setpoint will appear for the next 5 seconds.
To change the setpoint, press one of the buttons until the
desired temperature is displayed. To scroll faster, hold the button.
Preset buttons
The thermostat has 3 temperature preset buttons:
Ͽ
Comfort preset button
Ͽ
Economy preset button
Ͽ
Vacation preset button
To use a preset temperature, press the appropriate button. The
corresponding symbol , or will be displayed.
The following table shows the intended use and the default setting
of each of the preset buttons.
To store a preset temperature:
n Set the desired temperature using the buttons.
o Press and hold the appropriate preset button until the corre-
sponding symbol is displayed.
1. Description
Display
% of duty cycle 1 to 24% 25 to 49% 50 to 74% 75 to 99% 100%
2. Control Module Removal/Installation
3. Configuration Switches
# Functionality UP DN
SW1
Temperature format
a
a. If you change the temperature display format, the preset buttons ( , and )
will return to their default settings.
°F °C
SW2
Early Start
b
b. Early Start functions in Automatic mode only. When this function is enabled, the
thermostat calculates the optimal time to start heating in order to obtain the desired
temperature by the set time. The thermostat re-assesses the optimal start time
daily based on the previous day’s performance.
Disable Enable
SW3 Time format
12-hour 24-hour
On/Off switch *
Day and time
settings
Temperature
adjustment
buttons
Program button
Mode selection /
program exit
Temperature display
Mode display
Period display
Temperature
preset buttons
Time display
Heating power **
Backlight button
Program
clear button
Preset temperature
icon display
Appears when
the setpoint is
displayed
4. Power-up
5. Error Messages
6. Backlight
7. Temperature Setting
Symbol Intended use Default setting New
Comfort
(when at home)
70°F (21°C)
Economy
(when asleep or away from home)
62°F (16.5°C)
Vacation
(during prolonged absence)
50°F (10°C)
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