TH109PLUS Non-Programmable Thermostat
Model: 400-109-005-D
Date: 2021-01-31
About Your New Thermostat
This thermostat is designed to control an electric heating system such as a baseboard heater, a convector, or a fan-forced heater.
The thermostat CANNOT be used with:
- a resistive load under 2 A
- a resistive load over 12.5 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
For assistance, call 1-800-831-2823.
Controls and Display
Appearance:
- Backlit Screen
- Up button
- Down button
Display Icons:
- Appears when the setpoint is displayed
- Heating intensity indicator (the image disappears when heating is off)
- Temperature
- Appears when the thermostat is configured for a fan-forced heater (see page 6)
- The settings are locked ? (see page 6)
Installation Guidelines
IMPORTANT: TURN OFF POWER TO THE HEATING SYSTEM AT THE MAIN POWER PANEL TO AVOID ELECTRICAL SHOCK.
- Installation must be performed by a qualified electrician and comply with local electrical codes.
- Do NOT install the thermostat where it can be exposed to water or rain.
- Avoid locations with air drafts, dead air spots, or direct sunlight.
- Do not install on a wall section concealing air ducts, chimney pipes, or stove pipes.
- Install the thermostat approximately 1.5 m (5 feet) high, on an inside wall facing the heater.
- Install the thermostat onto an electrical box.
- This thermostat has tinned copper wires for line and load connections. Use CO/ALR solderless connectors if connecting to aluminum wires.
- The thermostat wires are not polarized; either wire can connect to the load or power supply.
- Keep the air vents at the top and bottom of the thermostat clean and unobstructed.
Mounting the Thermostat
- Loosen the screw underneath the thermostat and separate the faceplate from the wallplate. (The screw remains captive.)
- Wire the thermostat (see page 5).
- Mount the wallplate to the electrical box using the provided screws.
- Set the configuration switches (see page 6).
- Reinstall the faceplate onto the wallplate and tighten the screw. Remove any protective film from the screen.
- Apply power to the heating system. Verify installation by checking that the heating system turns On when raising the setpoint and Off when lowering it.
Wiring
2-wire Installation
[Diagram showing 2-wire installation]
4-wire Installation
[Diagram showing 4-wire installation]
Configuration Switches
Configuration switches are located on the back of the faceplate. Factory settings are indicated.
| # | Parameter | Right | Left |
|---|---|---|---|
| 1 | Settings lock | Lock ? | Unlock |
| 2 | Fan-forced heater | Fan Yes ▶️ | No |
| 3 | Unit | °F | °C |
1. When settings are locked, the thermostat buttons are disabled and the ? icon appears.
2. Set to 'Fan Yes' for fan-forced heaters to prevent premature motor burnout. Leave at 'No' for better temperature regulation without a fan-forced heater.
Temperature Display and Setting
The thermostat typically displays the current room temperature.
- Press the Up or Down button once to display the set temperature (setpoint) for 5 seconds.
- Press the Up or Down button repeatedly to change the setpoint temperature.
- The screen backlight is active for 10 seconds after any button press.
Setup Menu
- Press and hold the Up and Down buttons simultaneously for three seconds to enter the setup menu.
- Press the Up or Down button to change an option.
- Press and briefly hold the Up and Down buttons simultaneously to advance to the next parameter.
- When the last parameter is displayed, press and hold the Up and Down buttons for three seconds to save changes and exit.
Note: If no button is pressed for 15 seconds, the thermostat saves changes and returns to normal display.
| Parameter | Options | Display and default setting |
|---|---|---|
| Minimum setpoint | 5°C – 30°C (41°F – 86°F) | 5°C Min |
| Maximum setpoint | 5°C – 30°C (41°F – 86°F) | 30°C Max |
| Note: The maximum setpoint cannot be set higher than the minimum setpoint. |
In Case of Difficulty
| PROBLEM | SOLUTIONS |
|---|---|
| Thermostat is hot. | This is normal unless too hot to touch. Ensure heater capacity does not exceed the thermostat's maximum load. |
| Wrong temperature displayed. | Avoid air drafts, heat sources (like light dimmers) near the thermostat. |
| Display disappears and reappears. | The heater's thermal circuit breaker may have opened due to overheating (obstructed heater) or a sensitive breaker. |
| Display is faded when heating is active. | Heater capacity may be less than the thermostat's minimum load requirement. |
| LO is displayed. | Measured temperature is below the display range. Heating is activated. |
| HI is displayed. | Measured temperature is above the display range. Heating is deactivated. |
| E1, E2 is displayed. | Verify thermostat and sensor connections. Heating is deactivated. |
Specifications
- Supply: 240 VAC, 60 Hz
- Minimum load: 2 A (resistive only) 500 W @ 240 VAC
- Maximum load: 12.5 A (resistive only) 3000 W @ 240 VAC
- Display range: 0°C to 50.0°C (32°F to 122°F)
- Setpoint range: 5.0°C to 30.0°C (41°F to 86°F)
- Resolution: 0.5°C (1°F)
- Operating temperature: 0°C to 50.0°C (32°F to 122°F)
- Storage temperature: -20.0°C to 50.0°C (-4°F to 122°F)
- Permanent memory: Temperature and configurations are retained after power outages.
- Compliance: ICES-003 Class B Notice - Avis NMB-3, Classe B. Complies with Canadian ICES-003.
- [CSA C US logo]
3-Year Limited Warranty
Resideo warrants this product, excluding the battery, against defects in workmanship or materials under normal use and service for three (3) years from the original purchase date. Resideo will repair or replace the product at its option if found defective during the warranty period.
To obtain warranty service:
- Return the product with dated proof of purchase to the place of purchase.
- Or, call Resideo Customer Care at 1-800-831-2823. They will advise if the product should be returned to Resideo Return Goods, Dock 4 MN10-3860, 1985 Douglas Dr. N., Golden Valley, MN 55422, or if a replacement can be sent.
This warranty does not cover removal or reinstallation costs. It does not apply if damage occurred while the product was in the consumer's possession.
Resideo's sole responsibility is to repair or replace the product. Resideo is not liable for any incidental or consequential damages. Some states do not allow limitations on incidental or consequential damages, so this limitation may not apply.
This is the only express warranty Resideo makes. Implied warranties, including those of merchantability and fitness for a particular purpose, are limited to three years. Some states do not allow limitations on how long an implied warranty lasts, so this limitation may not apply.
This warranty gives you specific legal rights, which may vary by state.
For warranty questions, write to Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-831-2823.
Customer Assistance
For questions about product installation or use, contact Resideo at: 1-800-831-2823.
CAUTION: ELECTRONIC WASTE NOTICE
Do not dispose of this product with household waste. Check for the nearest authorized collection centers or recyclers. Proper disposal helps prevent negative environmental and health consequences.
FCC statement available at: https://customer.resideo.com/en-US/support/residential/codes-and-standards/FCC15105/Pages/default.aspx
