White Rodgers BNP125 User Manual

The White Rodgers BNP125 is a programmable thermostat designed for electric heating systems such as baseboards, convectors, or aeroconvectors. It maintains room temperature at the set point with high accuracy, supporting resistive loads from 1.25A to 12.5A (120/240 VAC). Features Day/Night modes, optional Automatic mode for cycling, Fan mode for adjustable cycle times, Celsius/Fahrenheit display, and backlight support. Below are the key specifications, installation, operation, programming, and troubleshooting instructions.

Preparations

Assemble tools: screwdriver. Shut off electricity at main fuse box until installation complete. Label wires before disconnecting. This thermostat is for electric heating units only; compatible with 120/240 VAC resistive loads. Install away from drafts, direct sunlight, or heat sources for accurate sensing. No batteries required.

WARNING! Before installing and operating this product, the owner and/or installer must read, understand, and follow these instructions and keep them handy for future reference. If these instructions are not followed, the warranty will be considered null and void, and the manufacturer deems no further responsibility for this product.

Description

The thermostat is designed to control electric heating units such as baseboards, convectors, or aeroconvectors. It keeps the temperature of a room at the requested set point with a high degree of accuracy. This product is designed for installations with electrical current - with a resistive load - ranging from 1.25 A to 12.5 A (120/240 VAC).

Applications: Electric Baseboards, Convectors, Aeroconvectors; Resistive Loads Only.

Precautions

CAUTION! The thermostat must be mounted on a connection box on a wall facing the heating unit, at around 1.5 m (5 feet) above the floor level, on a section of the wall exempt from pipes or air ducts. Do not install the thermostat in a location where temperature measurements could be altered.

WARNING! Do not use on inductive loads or circuits exceeding 120/240 VAC, 12.5A resistive. All wiring must conform to local and national electrical codes and ordinances.

Specifications

• Electrical: 120/240 VAC, 50/60 Hz; Maximum electrical current with resistive load: 12.5 A.
• Power Ratings: 3000 W @ 240 VAC; 1500 W @ 120 VAC.
• Temperature Display Range: 3°C to 40°C (37°F to 99.5°F).
• Temperature Display Resolution: 0.5°C (0.5°F).
• Temperature Set Point Range: 3°C to 30°C (37°F to 86°F).
• Operating Ambient: Standard room conditions.
• Humidity: Not specified.
• Dimensions: Standard wall mount.
• Other: Day/Night modes, optional Automatic and Fan modes.

Removing Old Thermostat

Using a screwdriver, loosen the screw retaining the mounting base of the thermostat until you feel it loose (do not completely remove the screw). Then, remove the mounting base at the back of the thermostat by tilting it downward, then towards you.

Installation

Take the wires from the wall through the hole at the base of the mounting base and connect them using the supplied solderless connectors. When making the connection with aluminum wire, make sure that you are using connectors identified CO/ALR. Please note that the thermostat wires do not have polarity. Therefore, the way they are connected is not important. Place all the wires into the connection box. Align the little slots located on the top of the thermostat with those on the mounting base and secure the thermostat to the mounting base. Note that you can also position the thermostat on the left or the right side of the junction box.

Wiring Diagrams

Terminal Designations: No polarity; connect line and load wires to terminals.

Standard Wiring: Connect power wires to the two terminals (no polarity). For aluminum wire, use CO/ALR connectors.

CAUTION! Replace with CO/ALR connectors for aluminum wiring. Refer to equipment manuals for specifics.

Check Operation

Restore power. Adjust setpoint to test heating response. The thermostat will cycle the load to maintain temperature.

Fan Operation

1. The Fan mode adjusts the minimum heating time in a 10-min cycle (default 90 sec, adjustable 90-300 sec).
2. To activate/deactivate Fan mode (for backlight model): Press both buttons for 8 sec in Day mode; Celsius/Fahrenheit symbol blinks.

Heating System

1. Set to Day mode, adjust setpoint above room temp.
2. Heating activates; power level shown by thermometer bars (4 bars = 75-100%, etc.).
3. Setpoint below: Heating stops.

Emergency System

Not applicable; manual override via setpoint adjustment.

Cooling System

Not applicable; heating-only thermostat.

Operating Features

• Home Screen: LCD shows room temp, setpoint, mode (Day/Night), timer if applicable.
• Key Features: Powering on (defaults to Day mode, 21°C); Adjust setpoint (+/- buttons, 0.5°C increments); Night mode timer (default 8h, auto return to Day); Automatic mode (cycles Day/Night over 24h, press both buttons >3 sec in Night mode); Celsius/Fahrenheit (press both buttons 8 sec in Day mode); Fan mode (adjusts cycle time to limit on/off); Automatic mode reactivation (blinking icon warns if previously active).
• Range Limits: Setpoint 3-30°C (37-86°F).

Programming

Day/Night mode with optional Automatic mode for cycling. No full scheduling; manual or timer-based.

1. Set Time/Day: Not applicable; no clock.
2. Program: Adjust Day/Night setpoints; activate Automatic mode by pressing both buttons >3 sec in Night mode.
3. Timer: Night mode timer defaults to 8h; resets on switch to Night.

Installer Configuration

Fan mode activation/deactivation: Press both buttons 5 sec in Day mode (backlight model). Min heating time in Fan mode: 90 sec default (adjustable 90-300 sec in 10-min cycle).

Troubleshooting