MENRED BELL1 Wireless Programmable Room Thermostat for Boilers
The MENRED BELL1 is a wireless room-temperature control system designed for boilers and compatible heating equipment. It combines the battery-powered BELL1MF room thermostat with the BELL1MN AC220V wireless receiver, allowing the user interface to be installed without a direct control cable between the thermostat and receiver.
BELL1MF measures the indoor temperature, manages the heating schedule and transmits the heating demand by 470MHz radio frequency. BELL1MN receives that command and interfaces with the connected heat source. The two components are designed to work together and should be ordered and specified as one BELL1 wireless thermostat system.
For other electric and hydronic heating controls, browse the complete MENRED thermostat range.
What Is the BELL1 Wireless Boiler Thermostat System?
BELL1 is not a single standalone device. It is a paired wireless control solution consisting of a room unit and a receiver. The room thermostat is installed where it can sense a representative indoor temperature, while the receiver is installed near the boiler or other compatible heat-source control point.
| Component | System role | Power supply | Communication |
|---|---|---|---|
| BELL1MF | Measures room temperature, displays settings, manages the program and sends heating demand | DC3V, two AAA batteries | 470MHz RF transmitter |
| BELL1MN | Receives the wireless command and connects to the compatible heat-source control input | AC220V, 50Hz | 470MHz RF receiver |
| Complete BELL1 system | Wireless programmable room-temperature control for boilers and approved heating applications | Both power arrangements required | Stated range up to 200m in an open, unobstructed environment |
How BELL1MF and BELL1MN Work Together
- Room-temperature measurement: The built-in NTC sensor in BELL1MF monitors the indoor temperature.
- Setpoint comparison: BELL1MF compares the measured temperature with the user setting or active programmed period.
- Wireless command: When heating demand changes, BELL1MF sends a 470MHz RF command to BELL1MN.
- Heat-source control: BELL1MN receives the command and switches the compatible connected control circuit according to the system wiring.
- Automatic regulation: The cycle repeats to maintain the selected room-temperature condition.
The BELL1 radio connection is local RF communication. It is not Wi-Fi and does not require a router, cloud account or mobile application for its standard operation.
Key Features
Wireless Installation
The room thermostat communicates with the receiver by 470MHz RF, reducing the need for a control cable between the occupied space and the heat source.
Programmable Schedule
Six programmable schedule options allow the heating setpoint to follow different occupancy periods and daily routines.
Temporary Override
Users can select a temporary temperature different from the programmed value. The controller returns to the scheduled mode automatically after one hour.
Low-Power Room Unit
BELL1MF operates on two AAA batteries. Official product information states a battery operating period of up to approximately one year under the specified conditions.
Clear LCD Interface
The display presents room-control information in a clear format for convenient everyday adjustment.
Child Lock
The keypad-lock function helps prevent unintended changes to the selected room settings.
Programming and Temporary Temperature Override
BELL1MF provides a programmable operating mode for scheduled heating control and a temporary mode for short-term adjustment. A short press of the menu button switches between the period mode and temporary mode according to the product operating instructions.
In temporary mode, the user can select a different temperature without permanently changing the stored program. After one hour, BELL1MF automatically returns to the programmed period mode. This is useful when occupants need a short comfort adjustment while keeping the normal heating schedule intact.
Available schedule settings and operating steps should be confirmed against the manual supplied with the exact BELL1 configuration.
BELL1MF Room Thermostat Technical Data
| Model | BELL1MF |
|---|---|
| Power supply | DC3V, two AAA batteries |
| Ambient temperature | −5°C to 55°C |
| Measured temperature range | −9.5°C to 99.5°C |
| Temperature-control range | 5°C to 90°C; default user range 5°C to 35°C |
| Switching differential | Adjustable 0.5°C to 10°C; factory default 1°C |
| Temperature sensor | Built-in NTC sensor |
| Wireless frequency | 470MHz RF |
BELL1MN Wireless Receiver Technical Data
| Model | BELL1MN |
|---|---|
| Power supply | AC220V, 50Hz |
| Power consumption | Less than 2W |
| Wireless frequency | 470MHz RF |
| Stated transmission distance | Up to 200m without obstruction |
| External temperature limitation | Adjustable through BELL1MF; factory setting 35°C |
| Housing material | PC |
| Protection rating | IP20 |
Receiver terminal functions, switching capacity and compatibility with the selected boiler or heat source must be verified against the current BELL1MN wiring diagram before ordering and installation.
Wireless Range and Installation Conditions
MENRED's official product information states a valid transmission distance of up to 200m in an open environment without obstruction. This value should not be treated as a guaranteed indoor range.
Actual RF performance can be reduced by:
- Reinforced concrete walls and floors
- Metal equipment cabinets and structural elements
- Distance and building geometry
- Electrical equipment and radio-frequency interference
- Incorrect receiver or thermostat placement
For larger properties or difficult construction conditions, test the wireless connection at the intended mounting positions before final installation.
Applications and Heat-Source Compatibility
BELL1 is intended for room-temperature control in boiler and compatible heating applications where the heat source accepts the receiver's control output. Typical project scenarios may include:
- Residential boiler heating
- Hydronic radiator heating
- Hydronic underfloor-heating systems controlled through a compatible heat source
- Apartment and renovation projects where a new thermostat control cable is difficult to install
- Replacement projects requiring a separate room controller and equipment-side receiver
Installation Guidelines
BELL1MF Placement
- Choose a position representative of the occupied-room temperature.
- Avoid direct sunlight, windows, doors and external walls where possible.
- Keep away from fireplaces, radiators, lamps and other heat sources.
- Do not hide the thermostat behind curtains, furniture or in an unventilated corner.
BELL1MN Installation
- Disconnect electrical power before wiring.
- Follow the diagram for the exact receiver and heat source.
- Install in a suitable indoor location within its IP20 protection boundary.
- Electrical installation should be completed by a qualified professional in accordance with local regulations.
Pairing, RF testing and functional commissioning should be completed before the project is handed over to the user.
Information to Confirm Before Ordering
- Heat-source brand and model: Provide the boiler or heating-equipment information.
- Control-input requirement: Confirm the voltage, terminal type and required switching behavior.
- Required set contents: Confirm BELL1MF, BELL1MN and any required accessories.
- Installation distance: State the approximate separation and number of walls or floors.
- Project market: Confirm supply voltage, language, certification and packaging requirements.
- Order quantity: Provide sample, project or distribution quantity and the required delivery schedule.
Complete information allows MENRED to check the configuration before quotation and helps avoid ordering a thermostat or receiver that does not match the project's control interface.
OEM and Distribution Support
MENRED supports distributors, heating-equipment suppliers and project buyers with product selection, technical-document coordination and commercial quotations for BELL1 wireless thermostat systems.
OEM branding, packaging, documentation language, certification requirements and order quantities should be discussed and confirmed for the target market before production. Availability depends on the requested configuration and commercial terms.
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Frequently Asked Questions
Can BELL1MF work without the BELL1MN receiver?
No. BELL1MF is the wireless room controller and transmitter. It requires BELL1MN to receive the command and interface with the compatible heat source.
Is BELL1 a Wi-Fi thermostat?
No. The standard BELL1 system uses local 470MHz radio-frequency communication between BELL1MF and BELL1MN. It is not a Wi-Fi or app-controlled thermostat.
Can BELL1 control every gas boiler?
Compatibility is not universal. The boiler control-input voltage, terminal type, switching requirement and the BELL1MN wiring diagram must be checked before ordering or installation.
What is the wireless range of BELL1?
Official data states up to 200m without obstruction. Indoor range is normally lower and depends on walls, floors, metal structures, equipment interference and installation position.
How is BELL1MF powered?
BELL1MF uses two AAA batteries and has a DC3V supply. Official product information states up to approximately one year of battery operation under the specified conditions.
Does BELL1 support temporary temperature adjustment?
Yes. Temporary mode allows a different setpoint without changing the stored schedule. The thermostat automatically returns to the programmed period mode after one hour.
Where should BELL1MF be installed?
Install it where the measured temperature represents the occupied room. Avoid direct sunlight, drafts, heat sources, exterior-door influence and positions hidden by furniture or curtains.
What information is needed for a quotation?
Provide the boiler or heat-source model, control-input requirements, destination market, required quantity, certification needs, packaging requirements and whether a complete BELL1MF plus BELL1MN set is required.
Request a BELL1 Wireless Thermostat Quotation
Send MENRED your boiler or heating-equipment model, control-input information, destination market and required quantity. We will help confirm the BELL1MF and BELL1MN configuration before quotation.
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