Operating Instructions for Viessmann Vitodens 050-W Gas Boiler

Quick guide from the manual

This document provides operating instructions for the Viessmann Vitodens 050-W wall-mounted gas boiler. The system is designed for domestic heating and domestic hot water (DHW) production. Key operations include adjusting heating temperatures, managing DHW settings, and monitoring system status via the integrated control unit. Always ensure the system pressure is maintained and contact an authorized contractor for any installation, maintenance, or repair work.

Safety instructions

Danger: Incorrectly executed work on the heating system can lead to life-threatening accidents. Work on gas or electrical installations must only be carried out by qualified professionals.

• If you smell gas: Do not smoke, do not switch lights or electrical appliances on or off. Close the gas shut-off valve, open windows and doors, evacuate the area, and notify your gas utility and heating contractor from outside the building.
• If you smell flue gas: Shut down the heating system, ventilate the room, and close all doors in the living space.
• If there is a fire: Shut down the heating system, close fuel supply valves, and use a class ABC fire extinguisher.
• Water leakage: If water escapes, switch off the heating system at the external isolator and notify your heating contractor.
• Installation room: Never cover or close ventilation vents. Ensure ambient temperatures are between 0 °C and 35 °C.

Operation and control unit

The control unit features a black/white screen with touch buttons. The display is divided into a function area (A) and a navigation area (B).

• Navigation area (B): Use the menu button to access the main menu, arrows to scroll or adjust values, and OK to confirm.
• Home screen: Tap any button to wake the display. Tap repeatedly to return to the home screen.
• Standby: The display backlighting switches off after approximately 2 minutes.

Central heating

You can adjust the central heating settings directly on the control unit.

• Switching on/off: Navigate to the default display showing the heating circuit symbol. Hold the arrow button for 4 seconds to switch on or off.
• Adjusting temperature: Navigate to the heating circuit display, select the temperature, and adjust using the arrow buttons. Confirm with OK.
• Heating curve: This can be adjusted in weather-compensated mode to influence the flow temperature.

DHW heating

Domestic Hot Water (DHW) settings can be managed separately.

• Switching on/off: Navigate to the default display showing the DHW symbol. Hold the arrow button for 4 seconds to switch on or off.
• Adjusting temperature: Navigate to the DHW display, adjust the temperature, and confirm with OK. For hygiene reasons, it is recommended not to set the temperature below 50 °C.
• Eco function: Available for combi boilers, this can be set via the default display.

Further settings

• Display: You can adjust brightness and standby mode in the main menu.
• WiFi: Use the ViCare app to establish an internet connection. WiFi can be switched on or off in the main menu (P.7).
• Low power radio: Can be switched on or off in the main menu (P.8) for wireless remote control connection.

Checks and troubleshooting

If a fault occurs, a warning symbol and a fault code will appear on the display.

• Checking fault messages: Access the main menu and navigate to the fault message section to view details.
• Burner reset: If the burner is locked out, follow the on-screen instructions to reset it. Do not reset the burner multiple times in quick succession.
• Operating data: You can check system data like temperatures, pump speed, and burner hours in the information menu (P.2).

Maintenance

Regular maintenance is essential for safe and efficient operation. The system should be serviced by an authorized contractor at least every 2 years.

• Cleaning: Use a commercially available, non-scouring domestic cleaning agent. Clean the programming unit surface with a microfibre cloth.
• Safety valve: The function of the safety valve on the DHW cylinder should be checked every six months.
• Potable water filter: If installed, replace the filter element every six months or back-flush every two months.