RET B + RF - Thermostat DANFOSS - Free user manual and instructions

Product Type	Room Thermostat
Brand	Danfoss
Model	RET B + RF
Power Supply	2 AA alkaline batteries / MN1500
Dimensions (L x H x P)	85 x 86 x 42 mm
Weight (approx.)	150 g (with batteries)
Temperature range	5 to 30 °C
Accuracy	±1 °C
Contact type	SPDT, 230 VAC, 3 (1) A
Radio frequency (RF)	433.92 MHz
Transmitter range (RF)	30 m max
Main functions	Temperature regulation, heating and cooling mode, chrono-proportional, day/night mode (NSB), off/auto (LS), low battery indication
Operating modes	ON/OFF, chrono-proportional (3 or 6 cycles), day/night mode, off/auto
Display	Digital screen showing room temperature and setpoint
Installation	Wall mounting at 1.5 m above floor, away from drafts and heat sources
Compatibility RF receivers	RX1, RX2, RX3
Protection rating	Degree 2 (recycling)
Rated impulse voltage	2.5 kV
Standards	BS EN 60730-2-9, ball pressure test 75 °C
Maintenance and cleaning	Clean with a soft dry cloth. Do not use abrasive products or solvents. Replace the alkaline batteries as soon as the battery symbol appears.
Safety	Observe installation distances. For RF models, avoid metal obstacles between transmitter and receiver. Replace batteries within 15 days after the alert.
Spare parts and repairability	AA alkaline batteries (standard). Optional RF receiver. No specific spare parts provided.
General information	Programmable thermostat with radio link. Possibility to configure the system type (heating/cooling) and proportional mode via internal microswitches.

Frequently Asked Questions - RET B + RF DANFOSS

How to install the RET B + RF thermostat?

Mount the thermostat approximately 1.5 m above the floor, away from drafts and heat sources. Avoid metal obstacles between the transmitter and the RF receiver. Follow the provided wiring diagrams for wired versions.

What type of batteries to use and when to change them?

Use exclusively AA alkaline batteries / MN1500. When the battery symbol appears on the screen, replace the batteries within 15 days, otherwise the thermostat turns off and displays 'Of'.

How to pair the RF thermostat with the receiver?

Set the dial to position 1, then press the LEARN button (under the dial) for 3 seconds. On the receiver, hold PROG and CH1 for 3 seconds until the green LED flashes. Return the dial to 1.

What does the flame symbol on the screen mean?

The flame symbol indicates that the thermostat is calling for heat: it requests the boiler to operate.

What to do if the screen flashes in cooling mode?

Flashing in cooling mode means the output is timed to protect the compressor. Wait a few minutes; normal operation will resume automatically.

How to set the desired temperature?

Turn the adjustment dial to the desired temperature. It flashes on the screen, then after a few seconds, the display returns to the measured room temperature.

What is the difference between the RET B-LS and RET B-NSB models?

The LS model has an Off (O) / Auto (I) selector. The NSB model has a Day (sun) / Night (moon) selector: in night mode, the temperature is reduced by 4 °C from the setpoint.

Can I use this thermostat for cooling?

Yes, set the microswitches to 'COOL'. The thermostat displays a snowflake when calling for cool. For the NSB model, night mode increases the setpoint by 4 °C in cooling.

How to clean the thermostat?

Use a soft dry cloth. Never use abrasive products, solvents, or liquids. Avoid wetting the device.

Where can I find the complete manual?

The complete manual (96 pages) is available for free download on notice-facile.com in PDF format. You can also request a translation in another language.

USER MANUAL RET B + RF DANFOSS

Electronic dial setting thermostat with LCD display User & Installation Instructions

Certification Mark

Danfoss

GB Installation Instructions 3-9 User Instructions 10-14
F Instructions d'installation 15-20 Instructions d'utilisateur 21-23
D Installationsanweisungen 24-29 Inbetriebnahme-Instruktion 30-32
ES Instrucciones de instalación 33-38 Instrucciones del usuario 39-41
DK Instruktions vejledning 42-47 Brugervejleding 48-50
NL Installatie handleiding 51-56 Instructiesevoor Gebruik 57-59
G Οδηγίες εγκατάστασης 60-65 Οδηγίες χρήσης 66-68
P Instrukcja instalacji 69-74 Instrukcja Użytkownika 75-77
LT Montavimo instrukcijos 78-83 Informacija Vartotojui 84-86
Istruzioni per l'uso 87-92 Istruzioni per l'utente 93-95

Installation Instructions

GB

Features	RET B (RF) / RET B-LS (RF) / RET B-NSB (RF)
Contact rating 10 - 230 Vac, 3 (1) (excl. North America)
Contact rating (N.America)	10 - 24 Vac, 50/60Hz, 3(1)A
Temperature Accuracy ±1°C
Contact Type SPDT Type 1B
Transmitter frequency 433.92 MHz (RF models)
Transmitter range 30m max (RF models)
Power Supply 2 x AA/MN1	500 alkaline batteries
Control Pollution Situation	Degree 2
Rated Impulse Voltage 2.5 kV
Designed to meet BS EN 6	0730-2-9 (EN 300220 for RF)
Ball Pressure Test 75°C
Temperature Range 5-30°C
Dimensions (mm) 85 wide	x 86 high x 42 deep

Important note RF products: Ensure that there are no large metal objects, such as boiler cases or other large appliances, in line of sight between the transmitter and receiver as these will prevent communication between thermostat and receiver.

Mounting

Installation Instructions

Fix at a height of 1.5m approx from the floor, away from draughts or heat sources such as radiators, open fires or direct sunlight.

Wiring (not RF models)

GB

HEATING

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DIL switch settings

Slide the DIL switches to the settings required (see below)

Diagram of an electrical enclosure with internal components and a close-up view of the internal panel (no text or symbols)

Heating selection

Cooling selection

ON/OFF - boiler switches ON when below set temperature and OFF when above

CHRONO - energy saving feature which fi res the boiler at regular intervals to maintain a set temperature, achieving a constant ambient environment for the user.

● use 6 Cycles for radiator systems
- use 3 Cycles for underfl oor heating

Locking & Limiting

GB

Line drawing of a portable device with a circular button and a lid, no text or symbols present

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Receiver Wiring (RF only)

RX1 RX2 and RX3

graph TD
    A["Electronics"] --> B["A"]
    A --> C["B"]
    A --> D["C"]
    A --> E["1"]
    A --> F["2"]
    A --> G["3"]
    A --> H["4"]
    A --> I["5"]
    A --> J["6"]
    K["N"] --> L["L"]
    M["COM"] --> N["ZONE 1 ON"]
    O["ZONE 1 OFF"] --> P["ZONE 2 ON"]
    Q["ZONE 3 ON"] --> R["ZONE 6 RX3 ONLY"]

Note: 1) For mains voltage operated systems, link terminal 2 to mains live supply
2) Power supply to unit must not be switched by timeswitch

Commissioning (RF only)

If the thermostat and the receiver have been supplied together in a combined pack, the units have been paired in the factory and no commissioning is required (RX1 only).

Step 1 RET B-RF

Position the setting dial to number 1. Remove dial, press & hold LEARN button for 3 seconds (located under setting dial).

Do not replace the setting dial yet

NOTE: Thermostat now transmits signal continuously for 5 mins.

Step 2 RX1

Press and hold buttons PROG and CH1 until green light fl ashes.

Step 3 RX2/RX3

For RX2 or RX3 repeat steps 1 and 2 for each thermostat and channel, leaving at least 5 mins between the commissioning of each thermostat.

Step 4 RET B-RF

To replace the thermostat setting dial, position the dial to number 1.

What is a room thermostat?

... an explanation for householders. A room thermostat simply switches the heating system on and off as necessary. It works by sensing the air temperature, switching on the heating when the air temperature falls below the thermostat setting, and switching it off once this set temperature has been reached.

Turning a room thermostat to a higher setting will not make the room heat up any faster. How quickly the room heats up depends on the design of the heating system, for example, the size of boiler and radiators.

Neither does the setting affect how quickly the room cools down. Turning a room thermostat to a lower setting will result in the room being controlled at a lower temperature, and saves energy.

The heating system will not work if a timeswitch or programmer has switched it off.

The way to set and use your room thermostat is to find the lowest temperature setting that you are comfortable with, and then leave it alone to do its job. The best way to do this is to set the room thermostat to a low temperature – say 18°C – and then turn it up by one degree each day until you are comfortable with the temperature. You won’t have to adjust the thermostat further. Any adjustment above this setting will waste energy and cost you more money.

If your heating system is a boiler with radiators, there will usually be only one room thermostat to control the whole house. But you can have different temperatures in individual rooms by installing thermostatic radiator valves (TRVs) on individual radiators. If you don't have TRVs, you should choose a temperature that is reasonable for the whole house. If you do have TRVs, you can choose a slightly higher setting to make sure that even the coldest room is comfortable, then prevent any overheating in other rooms by adjusting the TRVs.

Room thermostats need a free flow of air to sense the temperature, so they must not be covered by curtains or blocked by furniture. Nearby electric fires, televisions, wall or table lamps may prevent the thermostat from working properly.

User Instructions

Display

The LCD displays actual room temperature until the setting dial is moved.

Setting the temperature

Turn setting dial to required temperature. The selected temperature will flash in the LCD to signify it is showing set temperature.

After a short period the display stops flashing and shows actual room temperature.

Thermostat status (heat mode only)

A flame symbol will be lit whenever the thermostat is calling for heat.

Thermostat status (cool mode only)

A snowfl ake symbol will be lit whenever the thermostat is calling for cooling. If this is seen to flash, the thermostat output is delayed for a short period to prevent compressor damage.

Low battery indication

A battery symbol will flash in the display when batteries require replacement. Batteries should be replaced within 15 days, after which the thermostat will turn off the load it is controlling. When this happens "Of" will be displayed.

IMPORTANT: alkaline batteries must be used.

RET B-LS model only

This model is fitted with an Auto/Off switch.

When the switch is set in "I" position the thermostat controls at the temperature set by the setting dial.

When set to "O" the thermostat output is turned off and "Of" is displayed.

RET B-NSB model only

This model is fitted with a Day/Night switch.

When the switch is set to the "Sun Symbol", the thermostat controls at the temperature set by the setting dial.

When set to the "Moon symbol", the thermostat controls at 4°C below the temperature set by the setting dial.

NOTE: if used to control cooling, thermostat controls 4°C higher, with switch in MOON position.

Line drawing of hands using a tool to adjust or install a device (no text or symbols visible)

Illustration of hands assembling a mechanical component with a curved arrow indicating rotation (no text or symbols)

Diagram of a device casing with internal components and a scroll arrow indicating motion (no text or symbols)

HEATING

Diagram of a mechanical component with a tool interacting with it, showing a bracket and mounting base (no text or symbols)

Line drawing of hands connecting a device panel to a control panel (no text or symbols)

Line drawing of an electrical connector with a cable inserted, no text or symbols present

Diagram of a medical device with a hand symbol inside, no text or labels present

F

Technical line drawing of an electrical enclosure with internal components and a close-up inset showing labeled compartments (no text or symbols present)

Illustration of a digital camera with a magnifying glass and a circular lens (no text or symbols)

Line drawing of a compact digital camera with a circular button and a magnified inset showing the lens (no text or symbols)

Illustration of a Danish digital camera with a circular lens and a separate circular button (no text or symbols)

LEARN

Simple line drawing of a curved bracket with a labeled angle (5° and 1°) and a vertical line, no text or symbols present.

Simple line drawing of a corner with a curved line and sun icon, no text or symbols present

installationsanwei sungen

AUS
EIN
COM
HEIZUNG

Technical line drawing of a mechanical component with a bracket and mounting holes, showing a close-up view of the part (no text or symbols present)

Illustration of hands connecting a device panel to a control panel (no text or symbols visible)

Line drawing of an electrical enclosure with a cable inserted into the main panel (no text or symbols)

Technical line drawing of a device enclosure with internal components and a hand symbol (no text or labels)

Einstellungen

Technical line drawing of an electrical enclosure with internal components and a close-up inset showing internal panel layout (no text or symbols)

Illustration of a portable digital camera with a circular lens and padlock, alongside a circular dial indicator (no text or symbols)

Line drawing of a portable digital camera with a circular lens and a square button, no text or symbols present.

Line drawing of a digital camera with a circular lens and a separate circular button (no text or symbols)

LEARN

Nur RET B-LS-Modell

CALEFACCION

Technical line drawing of a mechanical component with a bracket and mounting holes, showing a close-up view of the component (no text or symbols)

Line drawing of hands installing or adjusting a component on an electronic device casing (no text or symbols)

Line drawing of an electrical connector with a cable inserted (no text or symbols)

Diagram of a medical device with a heart symbol inside, enclosed in a rectangular frame (no text or labels)

ES

Ajustes del instalador

Diagram of an electrical enclosure with internal components and a close-up view of the internal panel (no text or symbols)

Calefacción

Refrigeración

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Illustration of a portable digital camera with a circular lens and a separate circular button (no text or symbols)

Line drawing of a digital camera with a circular base and a magnified inset showing the lens (no text or symbols)

LEARN

Simple line drawing of a curved bracket with a labeled angle (5° and 1°) and a vertical line (no text or symbols beyond basic geometry)

Solo modelo RET B-NSB

HEATING

Line drawing of an electrical connector with a cable inserted, no text or symbols present

Technical line drawing of a device casing with internal components and a hand symbol (no text or labels)

Montørindstillinger

Diagram of an electrical enclosure with internal components and a magnified inset showing four labeled panels (no text or symbols present)

1) ON/OFF - kedlen er ON, når temperaturen er under den indstillede temperatur, og OFF, når temperaturen er over den indstillede temperatur

Illustration of a portable device with a circular lid, a shield, and a lock icon (no text or symbols)

Line drawing of a portable digital camera with a circular base and a magnified inset showing the lens (no text or symbols)

Low battery indication

Type RET B-LS

Simple line drawing of a corner with a 5-degree angle and a vertical line marked '1-O' (no text or symbols beyond basic geometry)

Type RET B-NSB

HEATING

Diagram of a mechanical component with a tool interacting with it, showing a bracket and mounting base (no text or symbols)

Line drawing of hands connecting a device panel to a control panel (no text or symbols)

Line drawing of an electrical connector with a cable inserted, no text or symbols present

Diagram of a medical device with internal organ outline and electrical components (no text or labels)

Instellingen

Diagram of an electrical enclosure with internal components and a magnified inset showing four labeled compartments (no text or symbols present)

Verwarmen

Koelen

Illustration of a digital camera with a magnified inset showing its internal components (no text or symbols)

Line drawing of a compact digital camera with a circular lens and a separate circular base (no text or symbols)

Stap 2 RX1 - Druk binnen 5 minuten na

Simple line drawing of a corner with a curved line and sun icon, no text or symbols present

Ovly's evictorations

Θέρμανση

Technical line drawing of a mechanical component with a hand holding a tool (no text or symbols)

Diagram of hands connecting a device panel to a control panel (no text or symbols visible)

Line drawing of an electrical connector with a cable inserted, no text or symbols present

Technical line drawing of a mechanical or electrical component with internal components and a central hand symbol (no text or labels)

Diagram of an electrical enclosure with internal components and a magnified inset showing four labeled panels (no text or symbols present)

Illustration of a digital camera with a rotary dial and a padlock, alongside a circular button symbol (no text or labels)

Line drawing of a compact digital camera with a circular lens and lid (no text or symbols)

Line drawing of hands using a handheld device to switch a cable (no text or symbols present)

Illustration of hands assembling a mechanical component with a curved arrow indicating rotation (no text or symbols)

Diagram of an open battery pack with internal compartments and a directional arrow indicating flow (no text or symbols)

HEATING

Technical line drawing of a mechanical component with a bracket and mounting base (no text or symbols)

Line drawing of hands connecting a device panel to a control panel (no text or symbols)

Line drawing of an electrical panel with a cable inserted into the socket (no text or symbols)

Technical line drawing of a device enclosure with a hand symbol inside (no text or labels)

Diagram of an electrical enclosure with internal components and a close-up view of the internal panel (no text or symbols)

Tryb - grzanie

Chłodzenie

Tryb ON/OFF (WŁ./WYŁ.)

Illustration of a portable device with a circular lid, a shield, and a padlock (no text or symbols)

Line drawing of a compact digital camera with a circular lens and a separate flat case (no text or symbols)

Montavimo instructicios

Šildymo

Technical line drawing of a mechanical component with a hand inserting a pin (no text or symbols)

Illustration of hands installing or adjusting a component on a device casing (no text or symbols visible)

Simple line drawing of an electrical connector with a cable inserted (no text or symbols)

Technical line drawing of a mechanical or electrical component with internal components and a central schematic symbol (no text or labels)

DIL jungiklio nustatymai

Simple diagram with three horizontal lines and four empty squares, no text or symbols present

Karštis

Chrono

3 ciklai

°C

Simple diagram with four horizontal lines and four empty squares, no text or symbols present.

Karštis

Diagram of an electrical enclosure with internal components and a magnified inset showing internal panel layout (no text or symbols)

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Line drawing of a compact digital camera with a circular lens and a lid, no text or symbols present

Imtuvo laidai (tik RF modeliams)

RX1 RX2 & RX3

graph TD
    A["Electronics"] --> B["A"]
    A --> C["B"]
    A --> D["C"]
    A --> E["1"]
    A --> F["2"]
    A --> G["3"]
    A --> H["4"]
    A --> I["5"]
    A --> J["6"]
    K["N"] --> L["L"]
    M["COM"] --> N["ZONE 1 ON"]
    O["ZONE 1 OFF"] --> P["ZONE 2 ON"]
    Q["ZONE 3 ON"] --> R["ZONE 3 ON"]
    S["TERMINAL 6 RX3 ONLY"] -.-> T["Terminal 6 RX3 ONLY"]

Tik RET B-LS modelis

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Illustration of hands installing or adjusting a battery pack into an open circuit board (no text or symbols present)

HEATING

Diagram of a mechanical component with a hand inserting a pin into a housing (no text or symbols)

Line drawing of hands installing or adjusting a component on an electronic device (no text or symbols)

Line drawing of an electrical panel with a cable inserted into the socket (no text or symbols)

Diagram of a medical device with a hand symbol inside, no text or labels present

Diagram of an electrical enclosure with internal components and a close-up view of the internal panel (no text or symbols)

Illustration of a portable device with a circular lid, a shield, and a padlock (no text or symbols)

Line drawing of a compact digital camera with a circular lens and a separate flat case (no text or symbols)

Line drawing of a Densell digital camera with a circular button and a pointer, no text or symbols present.

LEARN

Solo modello RET B-LS

www.danfoss.com/BusinessAreas/Heating

This product complies with the following EC Directives:

Electro-Magnetic Compatibility Directive.

(EMC) (89\336\EEC), (92\31\EEC)

Low Voltage Directive.

(LVD) (73\23\EEC), (93\68\EEC)

Part No 25693v09 07/07