GW21853 - Thermostat Gewiss - Free user manual and instructions

Product type	Electronic thermostat for fan-coil
Brand	Gewiss
Model	GW21853
Dimensions (approx.)	80 x 80 x 30 mm
Weight (approx.)	150 g
Power supply	230 V~ 50/60 Hz
Disconnection type	1 B / Electronic
Control outputs	Fan (3 speeds) and solenoid valve
Maximum total load	5(2) A at 250 V~
Temperature setting range	+5°C to +30°C (mechanically limitable)
Reading accuracy	±1°C
Maximum temperature gradient	1K / 15 min
Control type	Proportional band (amplitude 1°C)
Protection rating	IP30
Insulation class	Class II
Operating temperature	0°C to +50°C
Maximum wire cross-section at terminals	2.5 mm²
Main functions	Fan control (3 speeds) and solenoid valve, heating/cooling modes, fixed or thermostatic ventilation
Maintenance and cleaning	Clean with a dry cloth; do not use aggressive products
Safety	Installation by a professional; cut off power before intervention; respect polarity
Spare parts and repairability	Contact GEWISS customer service for any repair or part
General information	Electronic thermostat for fan-coil, compliant with CE standards (EMC and LVD)

Frequently Asked Questions - GW21853 Gewiss

How to install the GW21853 thermostat?

Install the thermostat 1.50-1.70 m above the floor, away from heat sources and drafts. Electrical installation must be carried out by a qualified professional after cutting off the power supply.

What are the electrical connections?

Connect the 230 V~ supply to terminals No. 2 (Neutral) and No. 3 (Phase). For the solenoid valve, use terminal No. 4. The fan speeds connect to terminals No. 5 (High), No. 6 (Medium) and No. 7 (Low). Respect polarity.

How to program the ventilation?

The programming wire (hole 1 of the terminal block) determines the mode: connect it to terminal No. 3 for fixed ventilation, or to terminal No. 4 for thermostatic ventilation. The solenoid valve is always thermostatic.

How to choose between heating and cooling?

Use the front rotary selector to choose the mode: position 'Winter' (heating), '0' (off) or 'Summer' (cooling).

What is the adjustable temperature range?

The temperature can be set from +5°C to +30°C. A range limiter disc (disco range) allows mechanical limitation of the range if necessary.

What to do if the thermostat does not turn on?

Check that the 230 V~ supply is present at terminals No. 2 and No. 3. Make sure the main circuit breaker is on. If the problem persists, contact an authorized technician.

How to clean the thermostat?

Clean the device with a soft, dry cloth. Do not use solvents, alcohol or abrasive products that could damage the housing.

What is the maximum supported load?

The maximum total load (fan + solenoid valve) is 5(2) A at 250 V~. Each individual output also supports 5(2) A.

Can I use the thermostat without a solenoid valve?

Yes, the thermostat can control only the fan. In this case, do not connect anything to terminal No. 4 and program the ventilation wire to terminal No. 3 for fixed or thermostatic ventilation.

Where to find the full manual?

The full manual in PDF format is available for free on our site notice-facile.com. You can also request a translation in your language by email.

USER MANUAL GW21853 Gewiss

TERMOSTATO ELETTRONICO PER FAN-COIL

ELECTRONIC THERMOSTAT FOR FAN-COIL THERMOSTAT ÉLECTRONIQUE POUR FAN-COIL TERMOSTATO ELECTRÓNICO PARA FAN-COIL ELEKTRONISCHER THERMOSTAT FÜR FAN-COIL

CE

0 I II III 0 10 20 30 0 0

GW 20 853 - GW 21 853

Digital multimeter display with measurement scale and control buttons, crossed out by a black 'X' symbol

Diagram showing a device with crossed-out black lines and control buttons, indicating no readable text or symbols.

Pure electrical circuit lines without any symbols

Fan-coil

graph TD
    A["Fan-coil Fan-coil"] --> B["Flow Up"]
    A --> C["Flow Down"]
    D["Termostato Termostato"] --> E["Flow Up"]
    D --> F["Flow Down"]
    B --> G["Return to Ground"]
    C --> H["Return to Ground"]
    E --> I["Return to Ground"]
    F --> J["Return to Ground"]

Electronic thermostat for Fan-Coil

ATTENTION - IMPORTANT

• Congratulations for having choosing a Gewiss product. Gewiss products are constructed with careful attention to detail, using only high quality materials. Gewiss products assure you of peak performance over time.
• Carefully read the following instructions since they contain important information on installing and operating the product. The installer should give these instructions to the final user and ask him to read the contents.
• System programming products must be installed in conformity with the provisions of HD 384 - ÖEC364 regulations for devices for household or similar use in non-dusty rooms or where special protection against water penetration is not required.
• Ön case of failure and/or malfunction, contact an authorized technician or GEWÖSS SAT technical assistance service.

INÑÜX

page

• GÜNÜRAL PROÑUÉT ÑÜSÉRIPTION

- yunctions 14

• INSTALLATION INSTRUÉTIONS

-äocation advice 15

- electrical connections 16

• OPÜRATING INSTRUÉTIONS

- Commands and signals 18

- èperating mode 19

FUNÉTIONS

OPÜRATING ÑATA

• èperating mode: thermostat-controlled solenoid valve and continuous fan operation, thermostat-controlled solenoid valve and fan operation, thermostat-controlled fan operation only and solenoid valve not connected
• Temperature setting block: mechanical with "range disk" (supplied)
• Öndicator lights: load on/off äED

TÜÉÜNIÉAL ÑATA

• Supply voltage: 230 V\~ 50÷60 Hz
- Disconnection and appliance type: 1 B / Electronic
- èput type by control type:

• continuous fan operation polarized single-pole switch 5(2)A / 250 V\~
• solenoid valve (thermostat-controlled) polarized single-pole èé/èFF relay 5(2)A / 250 V\~
• fan + solenoid valve relay + switch (thermostat-controlled) maximum total load 5(2)A / 250 V\~

• çaximum terminal wire section: 2,5 mm
- Önsulation type: Class ÖÖ
- êrotection class: Öê 30
- éolution: éormal
• Temperature control range: from +5°C to +30°C (limitable)
• Thermal gradient: max 1 à/15 min.
• Control type: proportional band (width 1°C)
- Reading accuracy: ± 1^
- èperating temperature range: 0^ to +50^
• Reference standards for CE certification:

EçC Eé55014-1 Eé55014-2 Eé61000-3-2 Eé61000-3-3

äVD Eé60730-1 Eé60730-2-9

(Directive 89/336/EEC - 7323/EEC)

INSTALLATION INSTRUCTIONS

LOCATION ADVICE

OK

0 1 2 3 112

Image of a digital multimeter with black cross symbols crossed out, indicating prohibition or prohibition.

Diagram showing a device with crossed-out black lines and control buttons, indicating no readable text or symbols.

Recommendations on positioning:

Önstall the thermostat at a height of from 1.50 to 1.70 m from the floor, far away from sources of heat, air ducts, doors or windows.

OK! h 1,5 m

Pure electrical circuit lines without any symbols

Fan-coil

Example of installation with thermostat controlling the fan and solenoid valve.

ThermostatThermostat

Fan-coil

Example of installation with thermostat controlling only the fan.

N.B.: The examples shown in the following documentation are for illustration purposes only.

ELECTRICAL CONNECTIONS

Important: electrical wiring installation of the devices and appliances should be carried out by qualified technicians in accordance with the regulations and laws in force. The manufacturer will not assume any responsibility for the use of products that must comply with special environmental and/or installation regulations; this obligation is the responsibility of and to the charge of the installer.

Warning: before installing the product, disconnect the power supply.

Important: the thermostat control outputs are polarized; pay close attention to äine and éneutral connections.

Wiring: as indicated in the figure.

Disconnect the power supply (main breaker).

Connect the fluid interception solenoid valve to terminal n° 4.

Based on the type of installation, connect the wires for speed control coming from the fan to terminals n° 5-6-7: terminal n° 5 - fan "High"

terminal n° 6 - fan "çedium"

wire for setting the fan operating mode (continuous or thermostat-controlled). 230 V~ L N Supply voltage 230 V~ 1 2 3 4 5 6 7 fan solenoid valve N

ELECTRICAL CONNECTIONS

The setting wire must always be connected to terminal n° 3 or terminal n° 4.

Setting the Fan-coil control mode

N.B.: the solenoid valve is always thermostat controlled.

a) - Thermostat-controlled fan operation

Connect the wire that comes out of the first hole of the thermostat terminal board (hole 1) to terminal n° 4.

230 V~ L N 1 2 3 4 5 6 7 I II III I O N

Wiring diagram for solenoid valve control and fan control with thermostat-controlled operation

b) - Continuous fan operation

Connect the wire that comes out of the first hole of the thermostat terminal board (hole 1) to terminal n° 3.

230 V~ L N 1 2 3 4 5 6 7 I II III IV O N

Wiring diagram for solenoid valve control and fan control with continuous fan operation

ÉOMMANÑS ANÑ SIGNALS

yan speed switch èff äow çedium High äxD load state indicator: èn = load on èperating mode control switch: - 0 - (Winter - èyy - Summer) ànob with temperature scale: 5°C to 30°C Reference mark for setting temperature

OPERATING PMODE

Based on the devices connected (fan and/or solenoid valve) and the terminal (n° 3 or n° 4) to which the wire for the fan operating mode setting is connected, the thermostat can operate in the following modes:

1) thermostat-controlled solenoid valve and continuous fan operation (fig. A)
2) thermostat-controlled solenoid valve and fan operation (fig. A)
3) thermostat-controlled fan operation only and solenoid valve not connected (fig. B)
Ön all cases, 3 different fan speeds can be selected by a switch on the front panel. Heating or cooling mode can also be selected by a switch on the front panel.

graph LR
    A["Fan-coil Fan-coil"] --> B["Thermostat"]
    C["Thermostat"] --> D["Thermostat"]
    style A fill:#f9f,stroke:#333
    style C fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style D fill:#ccf,stroke:#333

Example of thermostat installation with thermostat-controlled solenoid valve and fan control (continuous or thermostat-controlled)

graph TD
    A["Fan-coil Fan-coil"] --> B["Thermostat"]
    C["Thermostat"] --> D["Thermostat"]
    style A fill:#f9f,stroke:#333
    style C fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style D fill:#ccf,stroke:#333

Example of thermostat installation with fan control only (continuous or thermostat-controlled)

The thermostat operates with proportional temperature control, within a 1°C-band

width, as shown in the figure. Regulation is carried out by switching the load on and off for variable time intervals, depending on the difference between the temperature setpoint and the temperature reading.

GEWISS

FRANÇAIS

LOGIQUE PD'APPLICATION

OK

0 1 2 3 112

Image of a digital multimeter with black cross symbols crossed out, indicating prohibition or prohibition.

Diagram showing a device with crossed-out black lines and control buttons, indicating no readable text or symbols.

Pure electrical circuit lines without any symbols

Fan-coil

230 V~ L N 1 2 3 4 5 6 7 I II III I O N

Image of a digital multimeter with X-shaped prohibition symbols crossed out, indicating no resistance or measurement.

Diagram showing a device with crossed-out black lines and control buttons, indicating no readable function or status.

Pure electrical circuit lines without any symbols

Fan-coil

graph TD
    A["Fan-coil Fan-coil"] --> B["Flow Up"]
    A --> C["Flow Down"]
    D["Termostato Termostato"] --> E["Flow Up"]
    D --> F["Flow Down"]
    B --> G["Return to Ground"]
    C --> H["Return to Ground"]
    E --> I["Return to Ground"]
    F --> J["Return to Ground"]

Image of a digital multimeter with visible control panel and display screen, crossed out by black prohibition signs.

Diagram showing a device with crossed-out black lines and control buttons, indicating no readable function or status.

Pure electrical circuit lines without any symbols

Fan-Coil

graph TD
    A["Thermostat"] --> B["Fan-coil"]
    B --> C["Grid Flow Left"]
    B --> D["Grid Flow Right"]
    E["Thermostat"] --> F["Fan-coil"]
    F --> G["Grid Flow Left"]
    F --> H["Grid Flow Right"]
    I["Thermostat"] --> J["Fan-coil"]
    J --> K["Grid Flow Left"]
    J --> L["Grid Flow Right"]
    M["Thermostat"] --> N["Fan-coil"]
    N --> O["Grid Flow Left"]
    N --> P["Grid Flow Right"]
    Q["Thermostat"] --> R["Fan-coil"]
    R --> S["Grid Flow Left"]
    R --> T["Grid Flow Right"]
    U["Thermostat"] --> V["Fan-coil"]
    V --> W["Grid Flow Left"]
    V --> X["Grid Flow Right"]
    Y["Thermostat"] --> Z["Fan-coil"]
    Z --> AA["Grid Flow Left"]
    Z --> AB["Grid Flow Right"]

Date of installation

Room in which installed

äocal de l'installation

Installer's stamp and signature