Installation and Service Guide for Viessmann Vitodens 111-W

Important Information from the Manual

This document is intended exclusively for qualified contractors. It covers the installation, commissioning, maintenance, and troubleshooting of the Viessmann Vitodens 111-W wall-mounted gas condensing boiler. Always follow safety instructions to prevent accidents and material losses. Ensure the system is isolated from the power supply and the gas shut-off valve is closed before performing any work.

Product Description

The Vitodens 111-W is a gas condensing storage combi boiler featuring an Inox-Radial heat exchanger, a modulating MatriX-Plus burner, and an integrated stainless steel loading cylinder (46 l capacity). It is designed for sealed unvented heating systems.

Installation

Mounting: Fit the supplied pre-plumbing jig, mounting frame, or wall mounting bracket. Ensure the wall is suitable for the load. Connect all pipework so that it is free of load and torque stress.

Connections: Prepare water connections for heating flow, return, cold water, and DHW. Connect the condensate drain with a constant fall. Ensure the gas connection is sealed and checked for leaks.

Electrical Connections: The appliance is delivered with a power cable. Connect to a 230 V, 50 Hz supply with a max 16 A fuse. Route extra low voltage (ELV) leads separately from 230 V cables.

Commissioning

Commissioning must be performed using the commissioning assistant. Key steps include:

• Filling the heating system and loading cylinder.
• Venting the heating system.
• Checking the gas type and performing a leak test on the balanced flue system.
• Setting parameters via the service menu.

System Configuration

Parameters can be adjusted via the service menu (b.2). This includes settings for flow temperature, pump operating modes, scald protection, and heating curves. Further settings are available via the ViGuide software tool.

Maintenance and Repairs

Regular maintenance is required to ensure safe operation. This includes cleaning the heating surfaces, checking the condensate drain and trap, and inspecting electrodes. Always use genuine Viessmann spare parts. For repairs, such as replacing the HBMU heat management unit or the plate heat exchanger, follow the specific procedures outlined in the manual.

Troubleshooting

The programming unit displays fault codes in the event of an error. Common fault codes include:

• 59, 457: Fan issues; check cables and power supply.
• 357: Insufficient gas supply; check gas pressure.
• 416: Flue gas temperature sensor incorrectly positioned.
• 74: System pressure too low; top up with water.

For detailed fault analysis, refer to the fault message table in the manual. If a fault persists, reset the appliance after the cause has been remedied.

Technical Data

The boiler is approved for installation in wet rooms in safety zone 3 (IP X1). It supports natural gas and LPG. Detailed specifications, including heating output ranges, power consumption, and dimensions, are provided in the specification section.