GW20852 - Thermostat Gewiss - Free user manual and instructions

Product type	Electric thermostat summer/winter
Brand	Gewiss
Model	GW20852
Power supply	230 V~ 50/60 Hz
Output type	Relay with changeover contact 8(2)A / 250 V~
Connection	2 or 3 wires
Maximum wire cross-section	2.5 mm²
Insulation type	Class II
Protection degree	IP30
Adjustment range	+5°C to +30°C
Thermal gradient	max. 1K/15 min.
Differential operation	0.7°C
Reading accuracy	±1°C
Operating temperature	0°C to +50°C
Main functions	Summer/winter switching, night reduction (-4°C), load indicator light
Load indicator	LED (on = load activated)
Remote control input	Yes (terminals 6 and 7) for night reduction
Installation	Recommended height 1.50-1.70 m, away from heat sources
Maintenance and cleaning	Clean with a soft, dry cloth. Do not use abrasive products.
Safety	Installation by qualified personnel, disconnect power before intervention, comply with CE standards (EMC and LVD)
Spare parts and repairability	Contact GEWISS after-sales service (SAT)
Standards	EMC EN55014-1, EN55014-2, EN61000-3-2, EN61000-3-3; LVD EN60730-1, EN60730-2-9
Disconnection type	1 B / Electronic

Frequently Asked Questions - GW20852 Gewiss

How to install the GW20852 thermostat?

Installation must be carried out by qualified personnel. Cut off the power before proceeding. Fix the thermostat at a height of 1.50 to 1.70 m, away from heat sources, air inlets, doors or windows. Connect the power wires to terminals 4 (Line) and 5 (Neutral), and the load to terminals 1 (common), 2 (normally open) and 3 (normally closed) according to the diagram.

How to use the night reduction function?

Night reduction is activated by connecting an external contact (timer) to terminals 6 and 7. When the contact is closed, the set temperature is reduced by 4°C compared to the programmed value. In summer mode (air conditioning), this function is disabled.

What does the LED on the thermostat mean?

The LED indicates the load status: on = the load (heating or air conditioning) is activated; off = the load is deactivated.

How to switch from summer mode to winter mode?

Use the mode selector located on the thermostat. Set it to the desired mode: summer for air conditioning, winter for heating. The indicators and LED behavior adjust automatically.

What is the adjustable temperature range?

The adjustment range is from +5°C to +30°C. Use the rotary knob to select the desired temperature. Reading accuracy is ±1°C.

What electrical connections need to be made?

Connect the 230 V~ power supply to terminals 4 (Line) and 5 (Neutral). The load (boiler, pump, etc.) connects to terminals 1 (common), 2 (normally open) and 3 (normally closed). For night reduction control, use terminals 6 and 7. Respect the maximum wire cross-sections of 2.5 mm².

Is the thermostat compatible with multiple installations?

Yes. For multiple thermostats controlled by a centralized timer, connect all terminals 6 in parallel and all terminals 7 in parallel. The power supply (terminals 4 and 5) is also common.

What to do in case of malfunction?

In case of malfunction, contact an authorized technician or GEWISS technical support (SAT). Do not attempt to repair the device yourself. Ensure the installation complies with applicable standards.

What safety standards are complied with?

The thermostat complies with EEC directives (89/336 and 73/23). It meets standards EMC EN55014-1, EN55014-2, EN61000-3-2, EN61000-3-3 and LVD EN60730-1, EN60730-2-9. It is class II (double insulation) and IP30.

How to clean the thermostat?

Use a soft, dry cloth. Never use abrasive products, solvents or water. Before cleaning, disconnect the device from power for safety.

USER MANUAL GW20852 Gewiss

Close-up of a portable electronic device control panel with rotary dial and indicator lights (no readable text or symbols)

GW 20 852 - GW 21 852

Two identical remote control devices with black X-shaped warning signs, no text or symbols present.

Pure electrical circuit lines without any symbols

A B

Pure electrical circuit lines without any symbols

D D

Diagram of a remote control panel with labeled buttons and a dial, showing thermal input and display settings.

Electronic summer/winter thermostat

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 ÖD 384 - ÜEC364 regulations for devices for household or similar use in non-dusty rooms or where special protection against water penetration is not required.
• Ün case of failure and/or malfunction, contact an authorized technician or GEWÜSS SAT technical assistance service.

INDEX

page

• GENERAL PRODUCT DESCRIPTION

- zunctions ....12

• INSTALLATION INSTRUCTIONS

-äocation advice 13

- yelectrical connections 14

• OPERATING INSTRUCTIONS

- wommands and signals 16

PERFORMANCE DATA

• Function summer / winter
- äuminous signals: äed indicating load on/off
- Remote control input for night-time lowering of heating (winter). (eight-time lowering is not possible for summer conditioning)
- eight time reduction temperature (referring to set): -4^

TECHNICAL SPECIFICATIONS

• Power supply: 230 V\~ 50÷60 Öz
- Type of disconnection and appliance: 1 B / Electronic
- Type of relay output: with exchange contact èê/Cêé/èC 8(2)A / 250 V\~
- User connections (load): 2 or 3 wires
- éax. wire section at the terminals: 2.5 mm ^2
- Type of insulation: Class ÜÜ ☐
• Grade of protection: ÜP 30
- Pollution: èormal
• Regulation range: from +5°C to +30°C
• Thermal gradient: max 1 à/15 min.
• Differential operation: t = 0.7^
- Precision of reading: ± 1^
• Temperature operating limits: 0°C to +50°C
- Reference standards for CE marking: EéC Eè55014-1 Eè55014-2 Eè61000-3-2 Eè61000-3-3 äVD Eè60730-1 Eè60730-2-9 (Directive 89/336/CEE - 7323/CEE)

INSTALLATION INSTRUCTIONS

LOCATION ADVICE

OK

Two identical remote control devices with black X-shaped prohibition signs on their sides (no text or symbols on devices)

Recommendations for positioning:

Ünstall the thermostat at a height of approx. 1.50÷1.70 m from floor level, away from heat sources, draughts, doors and windows.

OK! h 1,5 m

Pure electrical circuit lines without any symbols

A B

C

D D

Öeating systems with thermostat controlling:

A Wall mounted boiler
B Burner
C Circulation pump
D Zone solenoid valve

N.B.: The examples given in the following documentation are for illustrative purposes only.

Important: The installation and electrical connecting of the devices and appliances must be undertaken by qualified personnel and in accordance with standards and regulations in force at the time. The manufacture declines to accept any responsibility concerning the use of the products in accordance with particular environmental or installation regulations, as this responsibility rests entirely with the installer.

Warning: Prior to installing the product, ensure the mains electrical supply is disconnected.

With the mains power supply disconnected:

Connect the power supply cables to terminals è° 4 (äine) and è° 5 (èeutral).

Connect the wires of the device to be controlled to terminals: n^ 1 = common

n^ 2 = norm. open

n^ 3 = norm. closed

With strong inductive loads (pumps and solenoid valves) it is recommended that an RC filter is connected in parallel to the load.

Remote selection of "Comfort" or "Reduced" temperature

Whenever it is desired to utilise the remote selection of "Comfort" or "Reduced" temperature, connect the external contact to terminals è° 6 and è° 7 of the thermostat.

"Comfort" temperature = external contact open

"Reduced" temperature = external contact closed

Selection of “Reduced” temperature results in a 4^ C reduction with respect to the set temperature.

Example of connections to a boiler and timer to control night time reduction

Boiler and timer to C 1 NA 2 NC 3 L 4 N 5 6 7 Boiler Power supply 230 V~ Inputs for night time reduction control Timer switch L N 230 V~ Q Q

Multiple installations

Un multiple installations (offices, schools, homes, etc.) where the night time reduction is controlled from a single centralised timer, in addition to the above it is necessary to pay close attention to the following instructions:

1) Power supply 230V\~

Terminal 4: connect to mains äine (230V\~)

Terminal 5: connect to mains èeutral (return)

N.B.: normally with civil mains power supplies “brown” is the recognised colour for phase and “blue” for neutral (line return).

2) Connections for night time reduction

All terminals 6: connect in parallel with output 2 of the timer.

All terminals 7: connect in parallel with output 1 of the timer.

230 V~ L N C 1 NA 2 NC 3 L 4 N 5 6 7 Timer switch with contact èê, common to all the thermostats

Reference index for setting the temperature äyD signalling the load state: illuminated = load on Selector for controlling operating mode summer / winter änob with temperature scale: 5°C to 30°C

GEWISS

FRANÇAIS

Front view of a vintage electronic device with a rotary knob and indicator lights (no visible text or symbols)

Black and white photo of a device with a crossed-out X mark, no visible text or symbols

Top-down view of a vehicle with a cross symbol crossed out, indicating no visible text or symbols on the vehicle itself.

Pure electrical circuit lines without any symbols

A B

C

D D

Diagram of a remote control panel with labeled buttons and a dial, showing settings like 0, 10, 20, and 30.

Front view of a vintage electronic device with a rotary knob and indicator lights (no visible text or symbols)

Black and white photo of a handheld electronic device with a screen and control buttons crossed out by a diagonal line (no visible text or symbols)

Top-down view of a vehicle with a black X-shaped cross mark indicating no intersection or constraint (no text or symbols)

Pure electrical circuit lines without any symbols

A B

Pure electrical circuit lines without any symbols

D D

Diagram of a remote control panel with labeled buttons and a dial, showing thermal input and display settings.

Two identical remote control devices with black X-shaped prohibition signs on their faces (no text or symbols present)

Pure electrical circuit lines without any symbols

A B

C

D D → ←

Date of installation

Room in which installed

äocal de l'installation

Installer's stamp and signature