STELPRO Programmable Electronic Thermostat

Product Overview

The STELPRO ST302P and ST402P are programmable electronic thermostats designed for baseboard and convector heating systems. The document displays images of the ST302P and ST402P thermostat units, which feature a clean, modern design with a display screen and control buttons.

Important Instructions

• 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 for proper ventilation.

SAVE THESE INSTRUCTIONS

Technical Specifications

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.
• You will need a #2 Phillips screwdriver for installation.
• Install your thermostat approximately 5 ft (1.5 m) from the floor on an inside wall facing the heating system.

Installation: Attach the Mounting Plate

WARNING: Turn off the power supply.

1. Loosen the screw [A] at the top of the thermostat without removing it.
2. Separate the mounting plate from the thermostat by pulling the top of the plate and rotating it.
3. 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].
4. 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.

Connect the Power Supply Wires

WARNING: Incorrectly connected electrical wires could result in a fire hazard.

1. Complete the thermostat's electrical connection according to the diagram. Tighten wires securely in the supplied wire connectors.
2. Push the wires and connectors into the electrical box.
3. NOTE: If electrical wires are aluminum, use CO/ALR connectors (not supplied).

Diagram Description: A diagram illustrates the wiring connections for the thermostat. It shows power supply wires being connected to the thermostat terminals, labeled "LOAD POWER". The diagram depicts a typical 240V power supply connection.

Attach the Thermostat

1. Using the alignment guide, hook the bottom [A] of the thermostat into the bottom of the mounting plate. Ensure wires are not pinched between the thermostat and plate.
2. Rotate the thermostat upwards and attach it to the top hook of the mounting plate.
3. Tighten the screw [B] at the top of the thermostat to secure it in place.
4. Restore power at the circuit breaker.
5. NOTE: 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.

Interface

This thermostat is programmable, allowing setpoint temperature adjustments based on time of day and day of the week. It can also be used in MANUAL mode for a constant setpoint temperature. Touch the keypad once to activate the backlight for making changes.

Display Elements:

• Ambient temperature/contextual information
• Current program status (Wake, Leave, Return, Sleep)
• Heating output indicator
• Keypad locked status
• Week period indicator (Mo-Fr: Monday to Friday, Sa-Su: Saturday and Sunday)
• Menu indicator

Keypad: The interface includes control buttons for navigation and adjustments, typically labeled MENU, +, -, and OK.

Initial Settings and Programming

Follow on-screen instructions to adjust settings. Press [+] or [-] to change selections and [OK] to confirm.

• Language: ENG (English) / FRA (Français)
• Temperature format: °C / °F (Celsius / Fahrenheit)
• Operation mode: PROG (Programmable) / MANUAL. Select MANUAL for constant temperature. For PROGRAMMABLE mode, configure the following:
• Date and time
• Automatic daylight savings time switchover: DST Y / DST N
• Program setpoint temperatures: (Wake, Leave, Return, Sleep)
• Monday to Friday program hours: [Mo-Fr] (Wake, Leave, Return, Sleep)
• Saturday and Sunday program hours: [Sa-Su] (Wake, Sleep)

Default Program Values:

Features

Key Features

1. Press [+] or [-] to adjust the setpoint temperature by 0.5°C / 1°F. In PROGRAMMABLE mode, this is a temporary override; the thermostat returns to the program at the next scheduled event. Press [MENU] to cancel the override.
2. Press [MODE] to switch between MANUAL and PROGRAMMABLE modes.
3. In PROGRAMMABLE mode, press [OK] twice to advance to the next program period.

Advanced Menu Access and Use

1. Press and hold [MENU] for 3 seconds to access advanced menus.
2. Use [+] or [-] to change selections.
3. Press [OK] to confirm a selection and proceed.
4. Press and hold [MENU] for 3 seconds to exit advanced menus.

Advanced Menu List:

• Language: FRA / ENG
• Temperature format: °C / °F
• Operation mode: PROG / MANUAL. When PROGRAMMABLE is selected, you can change:
  • Date and time
  • Automatic daylight savings time switchover: DST Y / DST N
  • Program setpoint temperatures (Wake, Leave, Return, Sleep)
  • Monday to Friday program hours: [Mo-Fr] (Wake, Leave, Return, Sleep)
  • Saturday and Sunday program hours: [Sa-Su] (Wake, Sleep)
  • Keypad lock: LOCK / UNLOCK
  • Reset thermostat to default values: RST N / RST Y

Technical Menu Access and Use:

1. Press [MENU] for 10 seconds to access technical menus (hold for 3 seconds for advanced menu, then another 7 seconds for technical menu).
2. Use [+] or [-] to change selections.
3. Press [OK] to confirm and proceed.
4. Press and hold [MENU] for 3 seconds to exit technical menus.

Technical Menu List:

• t1: Maximum room temperature setpoint limit (5°C to 30°C / 41°F to 86°F). Default: 30°C.
• t2: Minimum room temperature setpoint limit (5°C to 30°C / 41°F to 86°F). Default: 5°C.
• Note: Max setpoint must be higher than min setpoint, and min setpoint must be lower than max setpoint.
• 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-ST302-402P-0421 560-000027