Honeywell TL8230A Operating Instructions

1 . Description
Honeywell's TL8230A programmable thermostat can be used to
operate an electric heater to control the room temperature.
On/Off switch *
Appears when
the setpoint is
displayed
Day and time
settings
Heating power **
Program button
Program
clear button
Mode selection /
program exit
Backlight button
* 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.
Display
% of duty cycle 1 to 24% 25 to 49% 50 to 74% 75 to 99%
2. Control Module Removal/Installation
• 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.
3. Configuration Switches
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:
# Functionality
SW1
Temperature format
b
SW2
Early Start
SW3 Time format
a. If you change the temperature display format, the preset buttons (
will return to their default settings.
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.
TL8230A
Time display
Temperature display
Mode display
Preset temperature
icon display
Period display
Temperature
preset buttons
Temperature
adjustment
buttons
UP DN
a
°F °C
Disable Enable
12-hour 24-hour
,
4. Power-up
When the thermostat is powered, it initially performs a
series of tests
temperature.
When power is applied initially, the LCD displays:
0:00, MO (Monday),
Press the Hour and Min buttons to set the time.
Press the Day button to set the day.
5. Error Messages
LO: The measured temperature is below 32°F (0°C).
Heating is activated.
HI: The measured temperature is above 122°F
(50°C).
6. Backlight
When the backlight button is pressed, the display illuminates for 5
seconds. When either of the
minates for 10 seconds during which the setpoint appears for 5 sec-
onds. The actual temperature is then displayed.
7. Temperature Setting
100%
Setpoint
The thermostat generally displays the actual temperature. To view
the setpoint, press one of the
backlight button. The setpoint will appear for the next 5 seconds.
To change the setpoint, press one of the
desired temperature is displayed. To scroll faster, hold the button.
Preset buttons
The thermostat has 3 temperature preset buttons:
Comfort preset button
Economy preset button
Vacation preset button
To use a preset temperature, press the appropriate button. The
corresponding symbol
The following table shows the intended use and the default setting
of each of the preset buttons.
Symbol
Comfort
(when at home)
Economy
(when asleep or away from home)
Vacation
(during prolonged absence)
To store a preset temperature:
and )
Set the desired temperature using the
Press and hold the appropriate preset button until the corre-
sponding symbol is displayed.

Operating Instructions

Programmable Thermostat

before displaying the
and temperature.
buttons is pressed, the display illu-
buttons once or press the
, or will be displayed.
Intended use Default setting
70°F (21°C)
62°F (16.5°C)
50°F (10°C)
69-1803
TL8230A
actual
buttons until the
New
buttons.
21/2/05 1/2