GCR1751BT - Digital alarm clock JUNG - Free user manual and instructions

Product Type	Bluetooth Universal Timer for blinds/shutters/lighting
Brand	JUNG
Model	GCR1751BT
Power Supply	230 V AC (via insert)
Ambient Temperature	-5 to +45 °C
Storage/Transport Temperature	-20 to +70 °C
Timekeeping Accuracy	±10 seconds per month
Power Reserve	Approx. 4 hours
Radio Frequency	2.402 – 2.480 GHz
Transmission Capacity	Max. 2.5 mW (Class 2)
Transmitting Range	Typ. 10 m
Compatible Inserts	Switching, dimming, Venetian blind insert, 3-wire extension
Max. Paired Devices	8
Functions	Manual & time-controlled operation, app via Bluetooth, up to 40 switching times, astro function, random function, automatic summer/winter time, night mode, disabling function, code protection
LED Indicators	Function LED (red/orange/blue), Status LED (green/red)
Safety	Installation by skilled electrician only; disconnect before work; observe circuit breakers
Maintenance	No regular maintenance; reset to factory settings if needed (press buttons 3a+3b for 20 seconds during first 2 minutes after power-on)
Spare Parts / Repairability	Contact JUNG for spare parts; device not user-serviceable
General Information	Designed for indoor use only; complies with radio equipment directive; manufacturer: Albrecht Jung GmbH & Co. KG

Frequently Asked Questions - GCR1751BT JUNG

How do I pair my smartphone with the JUNG GCR1751BT?

Ensure the insert is connected and switched off. Press the ⚙ button (4b) for more than 4 seconds until the blue LED flashes slowly. Open the Clever Config app on your smartphone and search for the device. Select the Jung Timer BT cover and follow the app instructions to complete pairing.

What does the red LED on the device indicate?

The red function LED indicates that the disabling function is active. The red status LED indicates an error message or reset.

How do I activate or deactivate the disabling function?

Press the button (4a) for more than 4 seconds. When active, the function LED turns red and manual operation via the cover remains possible, but app and extension operation are blocked.

How do I set the ventilation position for a Venetian blind?

First move the blind to the upper end position. Then press and hold button (3b) for longer than 1 second. While it moves down, press and hold both buttons (3a) and (3b) to stop. Release and press button (3a) within 4 seconds to save the ventilation position.

How do I activate night mode?

Press and hold buttons (4a) and (4b) simultaneously for more than 4 seconds. The function LED turns red for 3 seconds to confirm activation. In night mode, LEDs only light for 5 seconds after a button press.

How do I reset the GCR1751BT to factory settings?

Within the first 2 minutes after switching on the mains voltage, press and hold buttons (3a) and (3b) for more than 20 seconds until the red status LED flashes quickly. Release and press any button briefly within 10 seconds. The device will reset.

Does the device have a power reserve?

Yes, the device has a power reserve of approximately 4 hours to maintain time and settings during a power outage. The time is automatically updated when reconnecting to the app.

How many switching times can I program?

You can program up to 40 individual switching times for blinds/shutters or lighting via the Clever Config app. Each switching time can save positions, dimming values, or switching states.

What is the Astro function?

The Astro function allows switching at sunrise and/or before sunset based on the device's GPS position. You can set an offset of 0 to 120 minutes. It is calculated weekly using the smartphone's GPS.

Can I control the device without a smartphone?

Yes, you can operate the blind/shutter or lighting directly using the buttons on the cover (3a and 3b). The disabling function, night mode, and basic settings are also accessible without the app.

USER MANUAL GCR1751BT JUNG

Universal timer Bluetooth

Art. no.: ..1751BT..

Operating instructions

1 Safety instructions

Electrical devices may only be mounted and connected by electrically skilled persons.

Serious injuries, fire or property damage possible. Please read and follow manual fully.

Danger of electric shock. Always disconnect before carrying out work on the device or load. In so doing, take all the circuit breakers into account, which support dangerous voltages to the device and or load.

These instructions are an integral part of the product, and must remain with the end customer.

2 Device components

Figure 1: Device components

(1) Insert

(2) Frame

(3a) Blind/shutter up / light on, brighter

(3b) Blind/shutter down / light off, darker

(4a) Disabling function

(4b) = activate Bluetooth coupling, Activating / deactivating automatic operation

(5) Function LED Red = Disabling function active Orange = Automatic operation deactivated Blue = Bluetooth connection active Flashing blue = Bluetooth coupling mode active Flashing blue three times = Time is not set

(6) Status LED Green = Blind/shutter activated / light switched on Red = Error message or reset

Priorities for the LED display: - Red LED before green or orange LED - Blue LED before red LED

3 Function

Intended use

• Manual and time-controlled operation of e.g. Venetian blinds, shutters, awnings, lighting or fans
  – Operation and programming with mobile end device (smartphone or tablet) via Bluetooth
  – Operation of switching, dimming or Venetian blind insert or 3-wire extension from LB management

Product characteristics

Functions directly on the cover

– Operation of blinds/shutters and lighting
- Activating / deactivating the disabling function
- Activating / deactivating automatic operation
– Running time and ventilation position of the blind/shutter can be saved
– Switch-on brightness or switch on to last brightness with dimming insert can be saved
- Night mode

Functions via Bluetooth app

– Operation of blinds/shutters and lighting with status feedback
– Display of current blind/shutter position, dimming position or switching state
– Programming of up to 40 individual switching times
- Venetian blind and slat positions or switching and dimming values can be saved at any switching time
– Possible to copy switching times from other devices
– Switching at sunrise and/or before sunset (Astro function)
– Astro time through position fixing
– Astro time shift can be set for each switching time
– Automatic summer/winter time changeover, can be switched off
- Random function
– Automatic date and time update when connecting with smartphone

Code request for protection for time guidance and configuration possible

21:30, Fr

09:00, Sat

21:30. Sat

09:00. Sun

21:00 Sun

Astro function is deactivated

– Automatic summer/winter time changeover is active

No switching times are available when operating on a switching/dimming insert

4 Commissioning

Install app on a mobile end device

Requirement for operation via app is a mobile end device with Bluetooth interface, running the Android operating system or iOS.

■ Download and install the Bluetooth app Google Play Store (Android). Clever Config from the iTunes App Store (iOS) or

Couple mobile end devices via Bluetooth

Precondition: The insert must be connected and switched off. The cover is placed on the insert and the mobile end device is close to the cover.

■ Activate coupling mode: Press the ⚙ button (4b) for more than 4 seconds. The blue LED flashes slowly. The coupling mode is active for one mir

■ Start the Clever Config app and search for the device to be coupled. The Jung Timer BT cover is displayed in the app.

■ Perform coupling. The coupling mode is automatically exited after successful coupling. The blue LED lights up to confirm an active connection.

A maximum of 8 mobile end devices can be coupled with a cover. When coupling the 9th device, the least used device will be deleted.

To be able to perform position movements of the blind/shutter on a Venetian blind insert, a reference movement is performed in the upper end position after the programming. This

LB management

Universal timer Bluetooth

■ Press and hold down the button (3a) and (3b).
The blind/shutter remains stopped, but continues to move after 4 seconds.
■ As soon as the blind/shutter has reached the lower end position, release the buttons and
press button (3b) within the next 4 seconds.
The running time is saved. The blind/shutter moves back to the upper end position.

Saving the ventilation position

To save the ventilation position, the Venetian blind must be moved to the upper end position and the status LED (6) switch off automatically.

■ From the top end position, press the button (3b) for longer than second.

The blind/shutter moves in the lower end position direction.

■ Press and hold down the button (3a) and (3b).

The blind/shutter remains stopped, but continues to move after 4 seconds.

■ As soon as the desired ventilation position has been reached, release the buttons and

press the button (3a) within the next 4 seconds.

The ventilation position is saved. The blind/shutter moves back to the upper end position.

i If the ventilation position is saved again, the old value is overwritten.

6 Operation of lighting

All settings and operations are also possible via Bluetooth app.

Switching the light

■ Press button (3a) or (3b) for less than 0.4 seconds.

i With a dimming insert, the light switches to the brightness that was last set or a saved brightness.

Switch light on with minimum brightness

■ Press the button (3b) for longer than 0.4 seconds.

Adjusting the brightness

- Dress button (2c) as (2b) for longer than 0.4 seconds

Activating / deactivating the disabling function

The disabling function disables extension operation and operation via the app and deactivates automatic operation. Manual operation using the buttons (3a) and (3b) continues to be possible.

With Venetian blinds, extension operation in the "UP" direction (wind alarm) continuous to be possible.

■ Press the button (4a) for longer than 4 seconds.

The disabling function is activated or deactivated.

The function LED (5) turns red if the disabling function is active.

Activating / deactivating night mode

In night mode, the status and function LEDs are not permanently lit, but only for 5 seconds after a button is pressed.

■ Press the buttons (4a) and (4b) for longer than 4 seconds.

Night mode is activated: The function LED turns red for 3 seconds.

Night mode is deactivated: The function LED turns green for 3 seconds.

Resetting the device to the factory setting

■ Press the (3a) and (3b) buttons during the first 2 minutes after switching on the mains voltage for longer than 20 seconds until the red status LED flashes quickly.

■ Release buttons (3a) and (3b) and press briefly once again within 10 seconds.

The red status LED flashes more slowly for approx. 5 seconds.

The device is reset to default setting. The blue function LED flashes three times to indicate that the time is not set.

On a Venetian blind insert, a reference run to the upper end position is performed.

i After resetting the device to the default setting, it has to be removed from the app. On iOS equipment, the device also has to be removed from the list of paired Bluetooth devices (Settings/Bluetooth). Otherwise, re-pairing will not be possible.

8 Information for electrically skilled persons

9 Technical data

Ambient temperature -5 ... +45 °C

Storage/transport temperature -20 ... +70 °C

Accuracy per month ± 10 s

The time is updated with every connection to the app.

Power reserve approx. 4 h

Radio frequency 2.402 ... 2.480 GHz

Transmission capacity max. 2.5 mW, Class 2

Transmitting range typ. 10 m

10 Parameter list

Adjustable parameters via app

Depending on the insert, the following parameters can be changed with the Bluetooth app.

Settings for switching/dimming and Venetian blind inserts

Parameters Setting	optionsDefault setting	Explanations
Position Determination of the current position via the GPS function of the mobile end device.		To adapt the Astro times to the geographical location, the GPS function of the mobile end device must be activated. The Astro time is calculated once a week for the localised place.
Sunrise time offset	+/- 0 ... 120 minutesDefault setting: 0 minutes	Astro times represent the sunrise and sunset times in the course of a calendar year. If you want the switching to be executed in the early morning at the start of twilight or only at full brightness, this can be realised with this shift.An extended adjustment can be used to specify a time at which the switching should be executed at the earliest or at the latest.

LB management

Universal timer Bluetooth

Parameters Setting	optionsDefault setting	Explanations
Maximum brightness	75 ...100 %Default setting: 100%	Specifies the maximum settable brightness.
Switch-on brightness	1 ...100 %Default setting: 100%	During brief operation, the output switches on at the set switch-on brightness. Note: If the value is above the set maximum brightness or below the minimum brightness, then the system will switch to the appropriate limit value.
Switching on to the last value	On, OffDefault setting: Off	It is switched on to the brightness that existed before switching off.

Settings only for 2-channel switch inserts

Parameters Setting	optionsDefault setting	Explanations
Dedicated fan channel	On, OffDefault setting: On	Switches the switch-on delay for output 2 on and off.If the parameter is switched off, output 2 switches on simultaneously with output 1.
Switch-on delay channel 2	0 s ... 60 minDefault setting: 2 min	After switching on output 1, output 2 also switches on after the time set here has elapsed.Precondition: "Dedicated fan channel" parameter is switched on.
Switch-off delay channel 2	0 s ... 60 minDefault setting: 5 min	After switching off output 1, output 2 also switches off after the time set here has elapsed.

Settings only for venetian blind inserts

LB management

Universal timer Bluetooth

Parameters Setting	optionsDefault setting	Explanations
Operating mode R	Roller shutterVenetian blindAwningDefault setting: Roller shut-ter	Roller shutterA rolling shutter or an awning is controlled for which the Fabric stretching function is re-quired.Venetian blindA Venetian blind is controlled.AwningAn awning is controlled for which the Fabric stretching function is required.
Blind/shutter ventilation posi-tion	0 ... 100 %Default setting: 100%	The blind/shutter stops in this position when shutting down.
Slat ventilation position	0 ... 100 %Default setting: 100%	In the "Venetian blind" operating mode, the opening angle of the Venetian blind slats for the ventilation position can be influenced here.
Wind alarm Off On	OffDefault setting: Off	Off:If the disabling function is active, extension operation in the "UP" direction (wind alarm) continues to be possible.On:If the disabling function is active, extension operation is no longer possible. Note: Should not be used in systems where wind alarm takes place via an extension.

Settings with optional brightness temperature sensor

Parameters Setting	optionsDefault setting	Explanations
Pure protection	On-Off	If the our protection function is switched on
Action with sun protection	Depending on the insertDimming value or blind/shutter position with slat position	The set value is called up when the sun protection brightness is exceeded.
Action with sun protection end	Depending on the insertDimming value or blind/shutter position with slat position	The set value is called up when the sun protection brightness is not reached.
Brightness twilight	5 ... 4,000 luxDefault setting: 10 lux	If a set twilight threshold value is exceeded for more than 4 minutes, twilight is activated. If the brightness rises over the preset twilight value for longer than 4 minutes, the twilight function is deactivated.
Dusk On, Off	Default setting: Off	When dusk is switched on, the stored action is carried out when it falls below the twilight value. Depending on the insert, light is switched or blinds are moved to a stored position and slats are tilted.
Action at dusk	depending on the insertDimming value or blind/shutter position with slat position	The set value is called up when the twilight threshold value is not reached.
Dawn On, Off	Default setting: Off	When dawn is switched on, the stored action is carried out when it exceeds the twilight value. Depending on the insert, light is switched or blinds are moved to a stored position and slats are tilted.
Action at dawn	depending on the insertDimming value or blind/	The set value is called up when the twilight threshold value is exceeded.

LB management

Universal timer Bluetooth

ALBRECHT JUNG GMBH & CO. KG

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58579 Schalksmühle

GERMANY

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www.jung.de