Bernstein HT01 Digital Thermostat

Product Overview

This document provides comprehensive instructions for the Bernstein HT01 Digital Thermostat, designed for underfloor heating systems. It covers installation, sensor selection, programming modes, technical specifications, mounting procedures, electrical connections, and essential safety guidelines.

Technical Data

Voltage:

AC230V ± 10% 50/60 Hz

Power Consumption:

5W

Setting Range:

5 ~ 30°C

Floor Overheating Protection:

30 ~ 80°C (factory set at 65°C)

Protective Housing:

IP20

Housing Material:

ABS + PC fire-resistant

Certification:

CE

Floor Sensor:

Rubber-Thermoplastic NTC 10K Sensor

Internal Sensor:

NTC 10K

Sensor Selection

The thermostat can be configured to use different sensor combinations. To change settings, press 'M' for 3 seconds, then 'M' again, and use the '+' / '-' buttons to select options.

• rs (Room sensor): Heating activates when room temperature falls below the set point. There is no limit on floor temperature.
• FS (Floor Sensor): Heating activates when floor temperature falls below the set point.
• rFS (Room and Floor sensor): Heating activates based on room temperature. The thermostat cuts power if the floor reaches a temperature higher than the programmed level (factory set at 65°C, adjustable between 30°C - 80°C; recommended maximum is 40°C).

* If using with floor coverings other than ceramic, porcelain, or stone, select the 'floor sensor only' option.

Thermostat Modes

The thermostat offers three primary operating modes, selectable by pressing 'M':

• Comfort mode ☀️: Activates underfloor heating at the preset temperature. Factory preset: 25°C.
• Energy-saving mode ?: Activates underfloor heating at a lower preset temperature, which can be set low enough to effectively turn heating off. Factory preset: 15°C.
• Holiday mode ?: Sets heating to a very low level for unoccupied rooms to prevent frost damage. Factory preset: 5°C.

Manual temperature adjustments made with the '+' or '-' buttons will revert to the preset level upon the next mode change.

Date & Time Settings

To set the correct date and time: Press and hold 'M' for 3 seconds. The minutes will flash; use '+' / '-' to adjust. Press 'M' again to adjust hours (24-hour format). Press 'M' once more to change the weekday (1-7 for Monday-Sunday).

7-Day Automatic Mode

Select the 7-day timer mode by pressing 'M' until the timer icon is displayed. The thermostat will automatically switch between Comfort and Energy-saving modes based on programmed date and time settings. Each day of the week can be programmed with individual settings.

To set up the automatic mode: Press and hold 'M' for 3 seconds. Press to select the day of the week to be programmed.

The screen displays a 24-hour grid, with each segment representing one hour. Each hour can be programmed for Comfort or Energy-save (On/Off) mode.

To make changes to the timed program: Use '+' / '-' to select the 60-minute period, then press 'M' to select the mode. Pressing '+' or '-' copies the selected mode from the previous 60-minute period. Settings are saved after 5 seconds of inactivity.

Advanced Settings

Access advanced settings by pressing and holding 'M' for 3 seconds, then pressing 'M' for each numbered function:

1. Temperature Calibration: Adjust the thermostat's temperature reading to match the actual room or floor temperature. The adjustable range is -8°C to +8°C.
2. Sensor Selection: Refer to the 'Sensor Selection' section for details.
3. Floor Temperature Display (rFS mode): When using the rFS sensor selection, the room temperature is displayed, and this function allows the user to view the current floor temperature.
4. Floor Overheating Protection (rFS mode): This function allows the user to set the maximum temperature the floor can reach. If the floor temperature exceeds this set-point, 'ALARM' will flash on the screen, and the heating output will be cut off.

Mounting of the Floor Sensor

The floor sensor must be installed within an approved non-conductive installation pipe (compliant with EN 61386-1) embedded in the floor. The pipe (flexible conduit) should be placed as high as possible in the subfloor. The sensor should be located equidistant between two runs of the heating element, with its tip at least 300mm away from the outer edge of the heating element.

The included 3-meter sensor cable can be extended up to 50 meters using a separate cable. The installation pipe must not contain any other cables, such as those supplying the heating wire, as switching peaks from these lines can create interfering signals that disrupt thermostat function. The heating supply cable should be placed in a separate pipe.

If the sensor fails, replacement is straightforward provided the sensor is installed within flexible conduit. The floor sensor must never cross the heating element.

Electrical Connection

All electrical connections must be made as detailed in the diagram and performed by a fully qualified and Part P certified electrician. The circuit supplying this controller must be protected by a 30mA RCD. Any doubts regarding installation should be directed to the distributor before proceeding. Testing of all under-floor heating systems should take place prior to the installation of floor coverings.

Wiring Diagram Description: A diagram illustrates terminal connections from 1 to 7. Terminal 1: Live from mains. Terminal 2: Neutral from mains. Terminal 3: Neutral to heaters. Terminal 4: Live to heaters. Terminal 5: Earth from heaters & mains. Terminal 6: White wire from sensor. Terminal 7: Black wire from sensor. The diagram also shows connections labeled SENSOR, L, N, 3600W/16A, and 230V/AC.

Important Safety Note: Remove this sensor from the circuit before performing any high voltage insulation tests.

Crucial Safety Warning: ALWAYS disconnect the mains supply via the switch in the main fuse board or consumer unit before commencing any electrical work. When connecting cables to the thermostat, ensure that all terminal screws are fully tightened, that earth wires are sleeved, and that no bare wires are showing.

Mounting & Installation

Diagram Description:

• Front: Shows the thermostat's front panel with dimensions 86x86mm.
• Thickness: Indicates the unit's depth of 50mm.
• Mounting Hole: Displays the pattern for mounting screws, with a 60mm diameter for the base.

Procedure:

• Release the front of the thermostat by inserting a small flat screwdriver into the two slots on the base.
• Make electrical connections as detailed in the 'Electrical Connection' section.
• Mount the base part of the thermostat onto either a BS recessed or surface-mounted box.

Safety Information

WARNING: RISK OF ELECTRIC SHOCK.

Disconnect power supply before making electrical connections. Contact with components carrying hazardous voltage can cause electrical shock and may result in severe personal injury or death.

This thermostat is not a safety device and should only be used with safety-certified floor heating systems suitable for their specific purpose. To avoid damaging your flooring, ensure the correct sensor selection and operating temperatures are selected during the programming process.

General Disclaimers

This manual is intended as a reference. It may contain information that differs from updated product versions. Product descriptions and drawings are for illustration purposes only and may not reflect the latest specifications. The company reserves the right to modify specifications without prior notice.