Stelpro Non-Programmable Electronic Thermostat
Owner's Manual and Installation Guide
Models: ST252NP, ST302NP, ST402NP
Important Instructions
Warning: The thermostat must be installed by a certified electrician.
Connect the thermostat to a 120 to 240 VAC power source ONLY and comply with load limits.
Warning - High Voltage: Turn off the power supply before installation and maintenance. Leave at least 12 inches (30 cm) clearance around the thermostat to ensure proper venting.
Save these instructions.
Technical Specifications
| Product Code | ST252NP | ST302NP | ST402NP |
|---|---|---|---|
| Supply Voltage | 120-240 V | ||
| Load Control Type | Resistive | ||
| Frequency | 60 Hz | ||
| Storage Temperature | -40°C to 50°C (-40°F to 122°F) | ||
| Operating Temperature | -20°C to 50°C (-4°F to 122°F). LC display less effective below 0°C (32°F) | ||
| Humidity | 5% to 98% without condensation | ||
| Action | Type 1.Y | ||
| Pollution Degree | 2 | ||
| Software | Class A | ||
| Rated Impulse Voltage | Category II (1500 V) | ||
| Load at 120 V (Watts) | 150-1250 | 150-1500 | 150-2000 |
| Load at 240 V (Watts) | 300-2500 | 300-3000 | 300-4000 |
Additional Notes:
- Independently mounted control for surface mounting.
- Thermistor used as a sensor, carries no load current.
- Overload protection device external to the control: circuit breaker (refer to local electrical code).
Before You Get Started
The box contains one (1) thermostat with mounting plate, two (2) mounting screws, two (2) twist-on wire connectors, and one (1) owner's manual.
To install this thermostat, you will need a #2 Phillips screwdriver.
Install your thermostat about 5 ft (1.5 m) from the floor on an inside wall facing the heating system.
Installation
1. Attach the Mounting Plate
Warning: Turn off the power supply.
- Loosen the screw [A] at the top of the thermostat without removing it.
- Separate the mounting plate from the thermostat by pulling the top of the plate and rotating it.
- Take the power wires [B] out of the junction box and run them through the large opening in the center of the mounting plate [C].
- Using the two (2) mounting screws provided [D], attach the thermostat mounting plate to the junction box. The plate can be centered on the junction box or shifted to the left or right.
Diagram Description: Shows the process of detaching the thermostat from its mounting plate, feeding power wires through the plate's central opening, and securing the plate to a junction box using screws.
2. Connect the Power Supply Wires
Warning: Incorrectly connected electrical wires could result in a fire hazard.
- Complete the thermostat's electrical connection according to the diagram below. Tighten the wires securely in the supplied wire connectors.
- Push the wires and connectors into the electrical box.
Note: If the electrical wires are aluminum, use CO/ALR connectors instead (not supplied).
Diagram Description: Illustrates connecting power supply wires to the thermostat terminals using wire connectors, then tucking them into the electrical box. The diagram specifically shows a 240 V power supply.
3. Attach the Thermostat
- Using the alignment guide, hook the bottom [A] of the thermostat into the bottom of the plate. Be sure not to jam the wires between the thermostat and mounting plate.
- Rotate the thermostat upwards and attach it on the top hook of the mounting plate.
- Tighten the screw at the top of the thermostat [B] to hold it in place securely.
- Restore the power at the circuit breaker.
Note: If you need to remove the thermostat, follow step 1 in section 1, then use a straight screwdriver to unhook it from the top of the mounting plate.
Diagram Description: Shows the thermostat being clipped onto the mounting plate, first at the bottom, then rotated upwards and secured at the top with a screw.
Interface
This is a non-programmable thermostat. The temperature setpoint remains constant unless you change it. Touch the keypad once to activate the backlight, then you can make changes.
Diagram Description: The thermostat interface displays heating output status, ambient temperature/contextual information, an ECO mode indicator, a keypad locked indicator, and a menu indicator. The main display shows the current menu or temperature. The keypad includes buttons for navigation (up arrow, down arrow) and menu selection/confirmation.
Initial Settings
To begin, follow the on-screen instructions to adjust your thermostat's settings. Press the [up arrow] button or the [down arrow] button to change your selection and the [menu/confirm button] to confirm.
- Temperature format: °C / °F (Celsius / Fahrenheit).
- ECO mode setpoint temperature: (5°C to 30°C / 41°F to 86°F). By default, the ECO mode setpoint is 17°C / 63°F.
Your heating needs may vary. This thermostat offers two modes: ECO and COMFORT. You can switch between them by pressing the mode button. ECO mode saves energy by using a more efficient setpoint temperature when you are sleeping or away from home.
Your thermostat is now ready to use!
Features
Key Features
- Press the [up arrow] button or the [down arrow] button once to lower or raise the setpoint temperature by 0.5°C / 1°F. The setpoint temperature will remain at this value until changed.
- Press the mode button once to switch from ECO mode to COMFORT mode and vice versa.
Note: If you change the setpoint temperature while in ECO mode, the thermostat will switch to COMFORT mode.
Advanced Menu Access and Use
- Press and hold the [menu/confirm button] for 3 seconds to access the thermostat's advanced menus.
- Press the [up arrow] button or the [down arrow] button to change your selection.
- Press the [menu/confirm button] to confirm your selection and proceed to the next menu.
- Press and hold the [menu/confirm button] for 3 seconds to exit the advanced menus.
Advanced Menus List:
- 10 - Temperature format: °C / °F (Celsius / Fahrenheit).
- 20 - ECO mode setpoint temperature (5°C to 30°C / 41°F to 86°F). By default, the ECO mode setpoint is 17°C / 63°F.
- 30 - Keypad lock: ON / OFF (Lock keypad / Unlock keypad).
- dEF - Reset thermostat to default values: N / Y (No / Yes).
Using the Technical Menus:
- Press the [menu/confirm button] for 10 seconds to access the thermostat's technical menus (the advanced menu will appear after 3 seconds, but continue to hold for another 7 seconds).
- Use the [up arrow] button or the [down arrow] button to change your selection.
- Press the [menu/confirm button] to confirm your selection and continue to the next menu.
- Press and hold the [menu/confirm button] for 3 seconds to exit the thermostat's technical menus.
Technical Menu List:
- t1: Maximum room temperature setpoint limit (5°C to 30°C / 41°F to 86°F). The default setting is 30°C.
- t2: Minimum room temperature setpoint limit (5°C to 30°C / 41°F to 86°F). The default setting is 5°C.
Note: The maximum setpoint limit must be higher than the minimum setpoint limit, and the minimum setpoint limit must be lower than the maximum setpoint limit.
- t3: Year of production.
- t4: Month of production.
- t5: Identification number.
- t6: Software version.
- t7: Thermostat control code.
Stelpro Limited Warranty
Limited three-year warranty. See details on www.stelpro.com.
STELPRO DESIGN INC. Saint-Bruno-de-Montarville, Québec, Canada, J3V 6L7
Document Reference: INS-ST252-302-402NP-1220
Part Number: 560-000023
