1. Important Safety Information
WARNING: All electrical connections must be performed by a qualified electrician in accordance with the electrical and building codes effective in your region. Failure to do so may result in electric shock, fire, or other hazards.
Do NOT connect this product to a supply source other than 120 VAC to 240 VAC. Ensure that the total load connected to the thermostat does not exceed the specified limits for the model (2500W for ST252NP).
Always disconnect power at the main circuit breaker before installing or performing any maintenance on the thermostat.
2. Product Overview
The Stelpro Non-Programmable Electronic Thermostat is designed to provide accurate and energy-efficient temperature control for electric baseboards and convectors. Its compact and durable design ensures reliable performance in your living space.
Front view of the Stelpro ST252NP thermostat.
The thermostat seamlessly integrated into a room setting.
Key Features:
- Precise Temperature Control: Maintains ambient temperature within ±0.5°C (1°F) increments, ensuring your living space remains at your ideal temperature setting.
- ECO Mode: One-click temperature setback for enhanced energy efficiency and convenience.
- Heat Boost Feature: Quickly raises the temperature for immediate comfort, ideal for sudden cold spells.
- Safe and Durable Design: Features a sealed housing and sturdy S3 mounting plate for secure installation. Clipped TRIAC switches offer a safer alternative to screwed switches.
- Compact Dimensions: Measures 4.35 in. (11.05 cm) wide, 4.94 in. (12.55 cm) high, and 1.38 in. (3.5 cm) deep, allowing for discreet placement.
Detailed dimensions of the thermostat for installation planning.
3. Installation (Setup)
Installation of the Stelpro thermostat should be performed by a qualified electrician to ensure compliance with local electrical codes and safety standards. The thermostat is designed for a simple 2-wire installation process.
Installation Steps:
- Disconnect Power: Before beginning any work, ensure the power supply to the heating system is completely disconnected at the main circuit breaker.
- Mounting: Secure the S3 mounting plate to the wall using the provided screws. Ensure it is level and firmly attached.
- Wiring: Connect the thermostat's wires to the electrical system using the provided twist-on wire connectors. Ensure all connections are tight and secure. Refer to the wiring diagram provided in the product packaging for specific connections.
- Attach Thermostat: Carefully attach the thermostat unit to the mounted plate, ensuring it clicks securely into place.
- Restore Power: Once installation is complete and all connections are verified, restore power at the main circuit breaker.
Note: The thermostat is compatible with 120 VAC to 240 VAC systems and is suitable for electric baseboards and convectors.
4. Operation
The Stelpro Non-Programmable Electronic Thermostat offers straightforward operation for maintaining your desired room temperature.
Interacting with the thermostat's control buttons.
Temperature Adjustment:
- Use the Up (<) and Down (>) arrow buttons on the thermostat to increase or decrease the desired temperature setting.
- The current temperature setting will be displayed on the digital screen.
ECO Mode:
- Press the ECO (leaf icon) button to activate the energy-saving ECO mode. This mode sets the temperature to a slightly lower, pre-defined setback temperature to conserve energy when you are away or sleeping.
- Press the ECO button again to return to your comfort temperature setting.
Heat Boost Feature:
- To quickly raise the room temperature, activate the heat boost feature. Consult your product's specific instructions for activating this mode, typically by holding down a combination of buttons or a dedicated boost button.
5. Maintenance
The Stelpro thermostat requires minimal maintenance to ensure optimal performance and longevity.
- Cleaning: Periodically wipe the thermostat's exterior with a soft, damp cloth. Do not use abrasive cleaners, solvents, or harsh chemicals, as these can damage the surface or internal components.
- Dust Accumulation: Ensure that the thermostat's vents (if any) are free from dust and debris to allow for proper airflow and temperature sensing.
- Inspection: Annually, or if you notice any unusual behavior, have a qualified electrician inspect the wiring connections to ensure they remain secure.
6. Troubleshooting
If you encounter issues with your Stelpro thermostat, refer to the following common troubleshooting steps. For complex problems, contact a qualified electrician or Stelpro customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermostat display is blank or not responding. | No power supply; loose wiring connection; internal fault. | Check the circuit breaker for the heating system. Ensure all wiring connections are secure (consult an electrician). If power is present and wiring is correct, the unit may be faulty and require replacement. |
| Room temperature is inaccurate or inconsistent. | Thermostat placed in a drafty area; direct sunlight exposure; heat source too close. | Ensure the thermostat is not exposed to drafts, direct sunlight, or other heat sources (e.g., lamps, appliances) that could affect its temperature sensor. Relocate if necessary. |
| Heating system not turning on/off as expected. | Incorrect temperature setting; wiring issue; thermostat fault. | Verify the desired temperature setting. Check wiring connections (consult an electrician). If the issue persists, the thermostat may be malfunctioning. |
| ECO mode not functioning. | Incorrect activation; internal fault. | Ensure you are pressing the ECO button correctly. If the feature still does not activate, contact support. |
If the problem persists after attempting these solutions, it is recommended to contact Stelpro customer support or a certified electrician.
7. Specifications
| Brand | Stelpro |
| Model Number | ST252NP |
| Colour | White |
| Product Dimensions (L x W x H) | 3.5 x 11.05 x 12.55 cm |
| Item Weight | 280 g |
| Power/Wattage | 2500 W |
| Voltage | 240 Volts |
| Material | Plastic |
| Special Features | Temperature Display |
| Controller Type | Push Button |
| Specific Uses | Electric Baseboard Heater |
| Temperature Control Type | Manual |
| Included Components | One (1) thermostat; two (2) mounting screws; two (2) twist-on wire connectors suitable for copper wires. |
8. Warranty and Support
The Stelpro Non-Programmable Electronic Thermostat (Model ST252NP) comes with a 3-year limited warranty from the date of purchase. This warranty covers defects in material and workmanship under normal use.
For warranty claims, technical support, or any inquiries regarding your product, please contact Stelpro directly:
- Manufacturer: Stelpro
- Address: 1041 Rue Parent, Saint-Bruno-de-Montarville, QC J3V 6L7, Canada
- Phone: 1-844-783-5776
- Email: info@stelpro.com
Please have your product model number (ST252NP) and proof of purchase ready when contacting support.
