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Vaillant ecoTEC plus 620 User Manual

Vaillant ecoTEC plus 620
112 pages
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en Installation and maintenance instructions
ecoTEC plus
VU../VUW..
0020308118_05 - 31.05.2023

Table of Contents

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Vaillant ecoTEC plus 620 Specifications

General IconGeneral
Boiler TypeCombi
MountingWall-mounted
Output Power20 kW
Efficiency (%)94
ErP RatingA
Dimensions (H x W x D)720x440x338 mm
Heating CircuitYes
Modulation1:4
Warranty5 years
Fuel TypeNatural gas

Summary

1 Safety

1.3 General safety information

Conveys critical safety information to prevent hazards.

5 Product description

5.11 Safety Devices

Outlines the product's built-in safety mechanisms.

6 Set-up

7 Installation

7.1.1 Gas supply

Details requirements for the gas supply and meter.

7.1.3 Using the correct gas type

Emphasizes using the specified gas type to avoid faults.

7.1.5 Pressure maintenance in the heating installation

Explains how to ensure correct system pressure using an expansion vessel.

7.2 Installing the air/flue pipe

Guides the installation of the air and flue system components.

7.2.5 Installing and connecting the air/flue pipe

Provides instructions for installing and connecting the air/flue pipe.

7.3 Installing the gas connection

Guides the safe and correct installation of the gas pipe.

7.4 Installing the hot and cold water connection

Explains how to connect the water supply lines.

7.6 Installing the heating flow and heating return

Guides the connection of the heating flow and return pipes.

7.8 Installing the condensate discharge

Details the installation of the condensate discharge system.

7.10 Electrical installation

Provides comprehensive instructions for electrical connections.

8 Operation

8.2 Calling up the installer level

Describes how to access the installer settings menu.

8.3 Calling up/setting diagnostics codes

Details how to view and adjust diagnostic codes.

8.4 Running a check programme

Explains how to initiate and run system check programmes.

8.5 Carrying out the actuator test

Guides on testing individual system components (actuators).

8.9 Running the chimney sweep mode (combustion analysis)

Details the procedure for combustion analysis.

9 Start-up

9.1 Pre-Commissioning checklist

Lists essential checks before initial power-on and commissioning.

9.2 Carrying out the initial start-up

Guides the procedure for the initial product start-up.

9.3 Checking and treating the heating water/filling and supplementary water

Covers water quality checks and treatment for the heating system.

9.5 Running through the installation assistant

Details the automated setup process for new installations.

9.5.2 Filling the installation

Step in the installation assistant for filling the heating system.

9.5.4 Setting the gas type

Step in the installation assistant to select the correct gas type.

9.7 Guaranteeing the system pressure

Details how to ensure correct system pressure during filling.

9.8 Flushing the heating installation for the first time ("cold")

Guides the initial cold flush of the heating system.

9.9 Filling the heating installation

Provides detailed steps for filling the heating system with water.

9.10 Purging the heating installation

Guides on removing air from the heating installation.

9.11 Filling and purging the domestic hot water system

Explains how to fill and purge the domestic hot water system.

9.12 Filling the condensate siphon

Details the procedure for filling the condensate siphon with water.

9.13 Checking the gas settings

Outlines essential checks for gas settings and compatibility.

9.13.1 Checking the factory-set gas setting

Verifies the factory gas setting against the site conditions.

9.13.2 Checking the air/flue pipe/flue gas recirculation

Details checks for air/flue system integrity and recirculation.

9.13.3 Checking the gas connection pressure/gas flow pressure

Guides on measuring gas pressures at the inlet.

9.13.4 Checking the O₂ content

Describes how to measure and interpret oxygen content for combustion analysis.

9.13.5 Checking the gas flow rate

Guides on measuring and verifying the gas flow rate.

9.14 Thoroughly flushing the heating installation ("hot")

Details the hot flush procedure for the heating system.

9.17 Checking leak-tightness

Instructs on checking for leaks in various circuits.

10 Adapting the unit to the installation

10.1 Setting parameters

Guides on setting essential system parameters.

10.3 Adapting the heating mode settings

Covers adjustments for heating mode operation.

10.3.2 Flow temperature

Covers settings related to the water flow temperature.

10.3.5 Setting the hydraulic operating mode

Explains selection of hydraulic operating modes.

10.3.6 Setting the pressure level for supplying the heating system

Details how to set the heating system's pressure level.

10.4 Adapting the domestic hot water settings

Covers adjustments for domestic hot water settings.

10.4.1 Setting the domestic hot water temperature

Explains setting the DHW temperature and legionella prevention.

11 Handing over to the end user

12 Inspection and maintenance

12.5 Inspection and maintenance

Provides a general overview of annual inspection and maintenance requirements.

13 Troubleshooting

13.3 Fault messages

Describes how fault messages are displayed and handled.

13.3.1 Eliminating faults

Steps to resolve detected faults.

13.4 Limp home mode messages

Explains reversible and irreversible limp home mode messages.

13.6 Eliminating faults in the product

General procedures for fault elimination.

13.7 Replacing defective components

Detailed instructions for replacing parts.

13.7.7 Replacing the gas valve assembly

Detailed steps for replacing the gas valve assembly.

13.7.8 Replacing the heat exchanger

Instructions for removing and replacing the heat exchanger.

13.7.13 Replacing the ignition electrode

Details on replacing the ignition electrode.

13.7.14 Replacing the control electrode

Guides on replacing the control electrode.

C Installer level

Installation assistant

Guides the initial setup and configuration process.

Hydraulic operating mode

Configuring the system's hydraulic operating mode.

Gas type selection

Selecting the correct gas type for the installation.

D Diagnostics codes

Diagnostics codes

Accessing and managing diagnostic codes.

G Check programmes

H Actuator test

I Maintenance codes

J Reversible limp home mode codes

K Irreversible limp home mode codes

L Wiring diagram

M Commissioning Checklist

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