Owner’s Guide
TH303
Programmable Thermostat
400-303-000-C
Table of contents
Overview |
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About your new thermostat .............. |
1 |
Quick reference to controls .............. |
2 |
Quick reference to screen display .... |
3 |
Installation |
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Removing the faceplate.................... |
4 |
Wiring ............................................... |
5 |
Installing the thermostat ................... |
6 |
Quick start-up / Setting the clock...... |
7 |
Operating modes |
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Automatic (Auto) mode..................... |
8 |
Manual (Man) mode ......................... |
9 |
Away mode..................................... |
10 |
Countdown mode ............................ |
11 |
Configuration |
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Default schedule............................. |
12 |
Modifying the schedule................... |
13 |
Setup parameters ........................... |
14 |
Setup procedure ............................. |
16 |
Appendices |
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In case of difficulty .......................... |
17 |
Customer assistance ...................... |
18 |
Specifications.................................. |
19 |
3-year limited warranty ................... |
20 |
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 10.4 A
•a system driven by a contactor or a relay (inductive load)
•a central heating system
SUPPLIED PARTS
•One (1) thermostat
•Two (2) 6-32 mounting screws
•Two (2) solderless connectors
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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.
•To enter or exit the programming mode, press the Select button and hold for 3 seconds.
Help tab
Slide up from the right and remove to view information on both sides.
Screen
Up button
Select button
Down button
2
TH303
Quick reference to screen display
Countdown mode (see page 11)
Flashes during Countdown mode 
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.)
Setpoint temperature 
(see page 2)
Ambient temperature
Periods (see page 12)
3
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. Remove the faceplate from the base by pulling the bottom section.
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TH303 |
Wiring |
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Connect |
either |
one |
of |
the |
2-wire installation |
4-wire installation |
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thermostat |
wires |
to |
the |
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heater wire |
and the other |
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Power supply |
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one to the power supply |
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wire |
using |
solderless |
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connectors for copper wires. |
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NOTE: Special CO/ALR solderless connectors must be used when connecting with aluminium conductors.
Power supply
5
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