400-303-000-C EF (4.5 x 3) ENG.
400-303-000-C EF (4.5 x 3) ENG.fm Page 0 Friday, June 19, 2009 9:28 AM Table of contents Overview About your new thermostat .............. 1 Quick reference to controls .............. 2 Quick reference to screen display .... 3 Installation Removing the faceplate.................... 4 Wiring ............................................... 5 Installing the thermostat ................... 6 Quick start-up / Setting the clock...... 7 Operating modes Automatic (Auto) mode.....................
400-303-000-C EF (4.5 x 3) ENG.fm Page 1 Friday, June 19, 2009 9:28 AM TH303 About your new thermostat This thermostat has been designed to control an electric heating system such as a baseboard heater, a radiant ceiling, a convector or a fan-forced heater. The thermostat CANNOT be used with: • a resistive load under 0.83 A • a resistive load over 10.
00-303-000-C EF (4.5 x 3) ENG.fm Page 2 Friday, June 19, 2009 9:28 AM 400-303-000-C Quick reference to controls • To turn the screen backlight on, press the Select button once. The backlight will remain on for 12 seconds. • To display the setpoint temperature, press the Up or Down button once. The setpoint will be displayed for 5 seconds. • To modify the setpoint temperature, press the Up or Down button until the desired value is displayed.
400-303-000-C EF (4.5 x 3) ENG.fm Page 3 Friday, June 19, 2009 9:28 AM TH303 Quick reference to screen display Countdown mode (see page 11) Flashes during Countdown mode Setpoint temperature (see page 2) Time Day Automatic mode (see page 8) Manual mode (see page 9) Away mode (see page 10) Heating intensity indicator (No icon appears when heating is off.
400-303-000-C EF (4.5 x 3) ENG.fm Page 4 Friday, June 19, 2009 9:28 AM 400-303-000-C Removing the faceplate TURN OFF POWER OF THE HEATING SYSTEM AT THE MAIN ELECTRICAL PANEL TO AVOID ELECTRIC SHOCK. WARNING: Installation must be carried out by a certified electrician and must comply with national and local electrical codes. Loosen the screw holding the faceplate to the base. The screw cannot be completely removed and remains captive on the base.
400-303-000-C EF (4.5 x 3) ENG.fm Page 5 Friday, June 19, 2009 9:28 AM TH303 Wiring Connect either one of the thermostat wires to the heater wire and the other one to the power supply wire using solderless connectors for copper wires. 2-wire installation 4-wire installation Power supply NOTE: Special CO/ALR solderless connectors must be used when connecting with aluminium conductors.
400-303-000-C EF (4.5 x 3) ENG.fm Page 6 Friday, June 19, 2009 9:28 AM 400-303-000-C Installing the thermostat • Install the base onto an electrical box. • Place the FAN switch on Yes only if the thermostat is connected to a fan-forced heater. Otherwise leave at No. • If applicable, peel off the protective sticker from the thermostat’s screen. • Reinstall the faceplate on the base and secure it in place with the screw. • Apply power to the thermostat at the main electrical panel.
400-303-000-C EF (4.5 x 3) ENG.fm Page 7 Friday, June 19, 2009 9:28 AM TH303 Quick Start-up / Setting the clock and date When you power the thermostat, the Time menu flashes on the screen. Set the thermostat’s clock and date as follows: Time Menu Select the format Set the hour Set the year Set the minutes Set the month Set the date Normal display NOTE: At any time, you can access the Time menu by pressing the Select button for 3 seconds and then pressing the Up button once.
400-303-000-C EF (4.5 x 3) ENG.fm Page 8 Friday, June 19, 2009 9:28 AM 400-303-000-C Automatic (Auto) mode In Automatic mode, the thermostat follows the programmed schedule (see page 12). To place the thermostat in Automatic (Auto) mode: Normal display Auto mode Select Auto Temporary override While the thermostat is in Automatic mode, you can press the Up or Down button to modify the temperature. The new temperature will be used until the end of the current period. Auto will flash during the override.
400-303-000-C EF (4.5 x 3) ENG.fm Page 9 Friday, June 19, 2009 9:28 AM TH303 Manual (Man) mode Use the Manual mode if you wish to keep the thermostat at the same temperature indefinitely. In this mode, the thermostat will remain at this temperature until you press the Up or Down button to change it.
400-303-000-C EF (4.5 x 3) ENG.fm Page 10 Friday, June 19, 2009 9:28 AM 400-303-000-C Away mode The Away mode can be used when you are away for an undetermined length of time. For frost protection while saving energy, the Away temperature is set by default at 15°C (59°F) and cannot be modified by simply pressing the Up or Down button. To modify the Away temperature, see page 16.
400-303-000-C EF (4.5 x 3) ENG.fm Page 11 Friday, June 19, 2009 9:28 AM TH303 Countdown mode Use the Countdown mode if you wish to keep the same temperature for a predetermined length of time. The choices of countdown times are: 15, 30, 45 min, 1, 2, 4, 8, 12, 18 hr and 1 to 14 days. At the end of the countdown, the thermostat automatically returns to the previous mode and uses the temperature programmed for that mode. At any time, you can cancel the Countdown mode by pressing the Select button.
400-303-000-C EF (4.5 x 3) ENG.fm Page 12 Friday, June 19, 2009 9:28 AM 400-303-000-C Default schedule When placed in Automatic mode (see page 8), the thermostat follows the programmed schedule. By default, the thermostat is programmed with the following schedule: Monday to Friday (Mo, Tu, We, Th & Fr) Period Wake Leave Return Sleep Starting time 6:00 (6:00 AM) 8:00 (8:00 AM) 18:00 (6:00 PM) 22:00 (10:00 PM) Saturday and Sunday (Sa & Su) Temperature 21.0°C (70°F) 16.5°C (62°F) 21.0°C (70°F) 16.
400-303-000-C EF (4.5 x 3) ENG.fm Page 13 Friday, June 19, 2009 9:28 AM TH303 Modifying the schedule To modify the schedule, proceed as follows: Select Exit to return to normal display Select Exit to return to the day selection menu (3 sec.) Normal display Program menu Select the days* Select the period Set the hour Set the minutes Set the temperature * The days can be selected collectively (Monday to Friday, Saturday & Sunday, or Monday to Sunday) or individually.
400-303-000-C EF (4.5 x 3) ENG.
400-303-000-C EF (4.5 x 3) ENG.fm Page 15 Friday, June 19, 2009 9:28 AM TH303 Configuration parameters (cont’d) 1 Fan Place at Yes if you have a fan-forced heater (to prevent premature burnout of the motor). Leave at No for better temperature regulation if you do not have a fan-forced heater. 2 Away temperature Set the temperature you wish to use when the thermostat is in Away mode (see page 10).
400-303-000-C EF (4.5 x 3) ENG.fm Page 16 Friday, June 19, 2009 9:28 AM 400-303-000-C Configuration procedure The Configuration menu is shown below. n o Press the Select button for 3 seconds to enter the main menu. Press the Up button twice to enter the Configuration (Conf) menu.
400-303-000-C EF (4.5 x 3) ENG.fm Page 17 Friday, June 19, 2009 9:28 AM TH303 In case of difficulty PROBLEM SOLUTIONS Thermostat is hot. This is normal. Ensure that the heater capacity does not exceed the thermostat’s maximum load. Displayed temperature is wrong. Remediate if any the following conditions exists: • The thermostat is exposed to air draft. • The thermostat is located near or above a heat source such as a light dimmer. Display disappears and reappears after a few minutes.
400-303-000-C EF (4.5 x 3) ENG.fm Page 18 Friday, June 19, 2009 9:28 AM 400-303-000-C Customer assistance If you have any questions about the product, contact us at: 705 Montrichard Saint-Jean-sur-Richelieu, Quebec J2X 5K8 Canada To reset the thermostat, press both Down and Select buttons and hold. After 3 seconds, RST appears. After the next 5 seconds, when RST disappears, release the buttons. Except for the time and date, the thermostat has now returned to its default settings.
400-303-000-C EF (4.5 x 3) ENG.fm Page 19 Friday, June 19, 2009 9:28 AM TH303 Specifications - Supply: 120/240 VAC, 60 Hz - Minimum load: 0.83 A (resistive only) 200 W @ 240 VAC 100 W @ 120 VAC - Maximum load: 10.4 A (resistive only) 2500 W @ 240 VAC 1250 W @ 120 VAC - Setpoint range: 5°C to 30°C (41°F to 85°F) - Display range: 0°C to 70°C (32°F to 99°F) - Setpoint/display resolution: ±0.
400-303-000-C EF (4.5 x 3) ENG.fm Page 20 Friday, June 19, 2009 9:28 AM 400-303-000-C 3-year limited warranty Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of three (3) years from the date of purchase by the consumer. If at any time during the warranty period the product is determined to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell's option).
