resideo TH303 Programmable Thermostat User Guide

resideo TH303 Programmable Thermostat

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

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.

Quick reference to screen display

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.

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.

NOTE: Special CO/ALR solderless connectors must be used when connecting with aluminium conductors.

Installing the thermostat

1. Install the base onto an electrical box.
2. Place the FAN switch as follows:
   • 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.
3. Reinstall the faceplate on the base and secure it in place with the screw.
4. Apply power to the thermostat at the main electrical panel.

Keep air vents at top and bottom of thermostat clean and unobstructed at all times.

If you change the FAN switch position after you have already applied power to the thermostat, disconnect power to the thermostat at the electrical panel for 3 seconds. The thermostat will use the new setting when you reapply power.

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:

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.

Your new thermostat is already preprogrammed and is now controlling the temperature.

Automatic (Auto) mode

In Automatic mode, the thermostat follows the programmed schedule.
To place the thermostat in Automatic (Auto) mode:

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. You can cancel the override by pressing the Select button twice to return to Automatic mode.

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.
To place the thermostat in Manual (Man) mode:

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.

NOTE: The Away mode can also be used to prevent tampering of the setpoint temperature in the summer season when heating is not required.
To place the thermostat in Away mode:

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 or 45 min, or 1, 2, 4, 8, 12 or 18 hr, or 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.
To place the thermostat in Countdown mode:

NOTE: At any time during the Countdown mode, you can adjust the countdown time and temperature by performing the steps shown inside the dotted rectangle.

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)

| Saturday and Sunday

(Sa & Su)

---|---|---
Period| Starting time| Temperature| Starting time| Temperature
Wake| 6:00 (6:00 AM)| 21.0°C (70°F)| 6:00 (6:00 AM)| 21.0°C (70°F)
Leave| 8:00 (8:00 AM)| 16.5°C (62°F)| -:–| –
Return| 18:00 (6:00 PM)| 21.0°C (70°F)| -:–| –
Sleep| 22:00 (10:00 PM)| 16.5°C (62°F)| 22:00 (10:00 PM)| 16.5°C (62°F)

The schedule consists of 4 periods per day, which represents a typical work day. However, you can program the thermostat to skip (cancel) the periods that do not apply to your situation. For example, Leave and Return periods are skipped for the weekend in the default schedule.
You can choose a different program every day; i.e., each period can have a different starting time and a different temperature every day.

Modifying the schedule

To modify the schedule, proceed as follows:

The days can be selected collectively (Monday to Friday, Saturday & Sunday, or Monday to Sunday) or individually.

To skip a period: When the hour or the temperature of the period is flashing, press the Up and Down buttons at the same time. (Alternatively, set its hour between 23:00 [11:00 PM] and 0:00 [midnight] or its temperature below 5°C [41°F].) Its time and temperature display will be replaced by dashes (-).

NOTE: If you do not press any button for one minute, the thermostat will automatically save any changes you have made and will return to its normal display.

Setup menu (1/2)

To modify the menu parameters, see page 16.

| Temperature unit| °C / °F| °C
 | Away temperature 1| 5°C – 30°C (41°F – 86°F)| 15°C (59°F)
 | Daylight Saving Time 2| On / Off| On
 | Early Start 3| On / Off| Off

Setup menu (2/2)

1. Away temperature
   Set the temperature you wish to use when the thermostat is in Away mode (see page 10).

2. Daylight Saving Time
   When the Daylight Saving Time function is enabled (On), the thermostat automatically switches to Daylight Saving Time on the second Sunday of March and to normal time on the first Sunday of November.

3. Early Start
   Early Start is used in Automatic mode only. When Early Start is enabled (On), the thermostat determines when to start heating so the desired temperature is attained at the beginning of Wake and Return periods. When Early Start is disabled (Off), heating starts only at the beginning of Wake and Return periods; thus there is a delay before you reach the desired temperature.

Setup procedure

The Configuration menu is shown below.

1. Press the Select button for 3 seconds to enter the main menu.
2. Press the Up button twice to enter the Configuration (Conf) menu.

NOTE : If you do not press any button for one minute, the thermostat will automatically save any changes you have made and will return to.

In case of difficulty (1/2)

exceed the thermostat’s maxi- mum load.
Displayed tempera- ture is incorrect.| 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.

•    The thermostat displays LP instead of the temperature.

•    The screen is blank.

| The thermostat is currently without power. This can happen in either condition:

•   There is a power outage.

•   The thermal protection device on the heater is opened. This can happen if the heater is obstructed by furniture or curtain and has overheated, or if the heater’s thermal protection device is too sensitive.

LP appears for the first five minutes. Then the screen becomes blank.

In case of difficulty (2/2)

hours. Set its clock and date ( Time menu).
Temperature does not change accord- ing to the pro- grammed schedule.| • Ensure the thermostat is in Automatic mode.

•   Check the clock ( Time menu) and the schedule ( Prog menu). If the thermostat is configured for 12-hour format, ensure that AM or PM appears on the screen.

LO is displayed| The measured temperature is below the display range. Heating is activated.
HI is displayed| The measured temperature is above the display range.
E1 , E2 is displayed| The thermostat performance is reduced due to a sensor error. Please contact technical support for more information.

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 37°C (32°F to 99°F)
Setpoint/display resolution: ±0.5°C (±1°F)
Operation: 0°C to 50°C (32°F to 120°F)
Storage: -20°C to 50°C (-4°F to 120°F)

Permanent memory: You do not need to adjust the temperature settings or the thermostat’s configurations following a power outage. However, you might need to set the thermostat’s clock and date if the outage lasts more than 4 hours.

ICES-003 Class B Notice – Avis NMB-3, Classe B
This Class B digital apparatus complies with Canadian ICES-003.

3-year limited warranty

Resideo warrants this product, excluding battery, to be free from defects in workmanship or materials, under normal use and service, for a period of three (3) years from the date of first purchase by the original purchaser. If at any time during the warranty period the product is determined to be defective due to workmanship or materials, Resideo shall repair or replace it (at Resideo’s option).
If the product is defective,

1. return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
2. call Resideo Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Resideo Return Goods, 1985 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can be sent to you.

This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Resideo that the defect was caused by damage which occurred while the product was in the possession of a consumer.

Resideo’s sole responsibility shall be to repair or replace the product within the terms stated above. RESIDEO SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT.

Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY RESIDEO MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE THREE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions concerning this warranty, please write Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.

Customer assistance

For assistance with this product please visit http://resideo.com or call Customer Care toll-free at 1-800-468-1502.

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.

FCC statement available at:
https://customer.resideo.com/en-US/support/residential/codes-and- standards/FCC15105/Pages/default.aspx

CAUTION: ELECTRONIC WASTE NOTICE
The product should not be disposed of with other household waste. Check for the nearest authorized collection centers or authorized recyclers. The correct disposal of end-of-life equipment will help prevent negative consequences for the environment and human health.

www.resideo.com

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