A.O. Smith DRE 52 Troubleshooting guide

0313851 / R1.0
DRE
Electric Commercial Water Heater
Electrische Commerciele Boiler
Chauffe-eau Tertiaire Électrique
DRE 52/80
Installation, User and Service Manual
Installatie-, Gebruikers- en Servicehandleiding
Manuel d'installation, d'utilisation et d'entretien
1522 / ENNLFR

A.O. Smith siège social Europe
De Run 5305
Boîte postale 70
5500 AB Veldhoven
Pays-Bas
T : [phone]
T : 0800 267 6484
[email protected]
www.aosmithinternational.com
A.O. Smith Hoofdkantoor Europa
De Run 5305
Postbus 70
5500 AB Veldhoven
Nederland
A.O. Smith Europe
De Run 5305
PO Box 70
5500 AB Veldhoven
The Netherlands
Data is subject to change / Gegevens onderhevig aan verandering / Données sujettes à révision

English
Preface........................................................................................3
About this manual....................................................................... 7
User part............................................................13
1 Introduction.............................................................................. 15
2 Safety........................................................................................17
3 Operation.................................................................................. 19
4 Use............................................................................................21
Installation, Maintenance and Service part........23
5 Introduction.............................................................................. 25
6 Safety........................................................................................27
7 Water heater............................................................................. 33
8 Installation............................................................................... 35
9 Maintenance..............................................................................45
10 Troubleshooting........................................................................ 49
11 Warranty................................................................................... 51
Index........................................................................................ 53
Nederlands
Voorwoord.................................................................................. 3
Informatie over deze handleiding................................................7
Gedeelte voor de gebruiker................................13
1 Inleiding....................................................................................15
2 Veiligheid.................................................................................. 17
3 Werking.....................................................................................19
4 Gebruik..................................................................................... 21
Gedeelte over de installatie en het onderhoud...23
5 Inleiding....................................................................................25
6 Veiligheid.................................................................................. 27
7 Boiler........................................................................................ 33
8 Installatie..................................................................................35
9 Onderhoud................................................................................ 45
10 Storingen.................................................................................. 49
11 Garantie.................................................................................... 51
Index........................................................................................ 53
Français
Préface........................................................................................3
À propos de ce manuel................................................................ 7
Partie Utilisateur............................................... 13
1 Introduction.............................................................................. 15
2 Sécurité.....................................................................................17
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3 Fonctionnement........................................................................ 19
4 Utilisation..................................................................................21
Partie Installation et entretien.......................... 23
5 Introduction.............................................................................. 25
6 Sécurité.....................................................................................27
7 Chauffe-eau...............................................................................33
8 Installation............................................................................... 35
9 Entretien................................................................................... 45
10 Pannes...................................................................................... 49
11 Garantie.................................................................................... 51
Index........................................................................................ 53
Common appendices
A Appendices................................................................................55
2

Preface
Copyright
Copyright © 2021 A.O. Smith Water Products Company
All rights reserved.
Nothing from this publication may be copied, reproduced and/or published by means of
printing, photocopying or by whatsoever means, without the prior written approval of A.O.
Smith Water Products Company.
A.O. Smith Water Products Company reserves the right to modify specifications in this
manual.
Trademarks
Brand names in this manual are registered trademarks of their respective owners.
Warranty
Refer to the appendix Warranty (see 11) for the warranty provisions.
Liability
User
A.O. Smith accepts no liability when the water heater is not used correctly and requires
the user to:
• Read this manual carefully and obey the instructions.
• Ask your installation engineer for advise about the use of the water heater.
• Make sure that the service and maintenance activities are done by a qualified
engineer.
• Store the manual, in good condition, near the water heater.
Installation engineer
A.O. Smith accepts no liability when the water heater is not used correctly and requires
the installation engineer to:
• Read this manual carefully and obey the instructions.
• Make sure that the entire water heater installation complies with the applicable
regulations (on page 4).
• Make sure that the water heater is tested before the installation is taken into use.
• Explain the correct use to the user.
• Notify the user when service and maintenance activities are necessary.
• Make sure that you hand over all applicable manuals.
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Supplier
The DRE water heater is designed in accordance with the applicable regulations. The water
heater is delivered with compliancy–marking and all necessary documentation to obey
these regulations. See the compliance section.
A.O. Smith accepts no liability for claims from third parties when:
• The instructions for the correct installation of the water heater are not obeyed.
• The instructions for the correct use of the water heater are not obeyed.
• The water heater did not have maintenance on the correct maintenance interval.
For more information, refer to the General Terms of Sales. These are available on request,
free of charge.
We believe that this manual provides you with accurate and complete descriptions of all
relevant components. If you, nonetheless find errors or inaccuracies in this manual, please
inform A.O. Smith. This helps us to further improve our documentation.
Compliance
To safely produce domestic hot water, the design and construction of the DRE water
heaters is in accordance with:
• CE
- the European Directive 2014/35/EU on low voltage appliances (LVD)
- the European Directive 2014/30/EU on Electromagnetic Compatibility (EMC)
- the European Directives 2011/65/EU and 2015/863/EU on RoHS II and RoHS
III
- the European Directive 2009/125/EC on Ecological Design (ErP)
• UKCA
- the Electrical Equipment (Safety) Regulations 2016 (UK SI 2016 No. 1101)
- the Electromagnetic Compatibility Regulations 2016 (UK SI 2016 No. 1091)
- the RoHS Iregulations 2012 (UK SI 2012 No. 3032)
- the Ecodesign for Energy-Releated Products Regulation 2010 (UK SI 2010 No.
2617)
Refer to the appendix Declaration of conformity.
Regulations
The installation of the equipment MUST be in accordance with the relevant requirements of
the Building Regulations, I.E.E. Regulations and the bylaws of the local water board.
In addition, the installation should follow the relevant guidance offered in the following
documents. It is not practical to list all relevant information due to continuous changes but
emphasis is placed on the following documents, as failure to comply with the guidance
given will almost certainly result in an unsatisfactory installation:
• British Standards (BS), especially:
- BS 6700: 1997 - Design, installation, testing and maintenance of services
supplying water for domestic use with buildings and their curtilages
- BS 67074: 1989 Part 1 and 2 - Application, selection and installation of
expansion vessels and ancillary equipment for sealed systems
- BS 7671: 2008 - Requirements for electrical installations, I.E.E. wiring
regulations seventeenth edition
- CP 342: Part 2 1974 - Code of practice for centralized hot water supply-
buildings other than dwellings
• CIBSE Guides
• Clean Air Act
• H.S.E Guidance
Note
Manufacturer's notes must not be taken in any way as overriding statutory obligations.
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Contact information
If you have any comments or questions, please contact:
A.O. Smith Water Products Company
Adress: PO Box 70
5500 AB Veldhoven
The Netherlands
Telephone: 0800 - AOSMITH (free)
0800 - 267 64 84
General: [phone]
E-mail: [email protected]
Website: www.aosmith.co.uk
In the event of problems with your electricity or water supply connections, please contact
your (energy/water) supplier.
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About this manual
Scope
This manual gives information about safe and correct use of the water heater and how
installation, maintenance and service activities have to be done correctly. You must obey
the instructions in this manual.
Caution
Read this manual carefully before you start the water heater. It can cause personal injury
and damage to the water heater when you do not read the manual and/or do not obey
the instructions.
The purpose of this manual is to:
• describe the working principles and layout of the water heater
• explain the safety devices
• highlight possible hazards
• describe the use of the water heater
• describe the installation, service and maintenance of the water heater
This manual has two parts:
• An User part that describes the correct usage of the water heater.
• An Installation, Maintenance and Service part, that describes the correct installation
and maintenance procedures.
Target group
The information in this manual applies to three target groups:
• users
• installation engineers
• service and maintenance engineers
The User part is intended for the (end) users. The Installation, Maintenance and Service
part is intended for the installation engineers and the service and maintenance engineers.
Notation conventions
This manual uses the following text conventions:
• Numbers between parentheses e.g. (1), refer to elements in a figure that are
described by the text.
• Cross-references to sections, tables, figures etc. are underlined and written as (see
"..."). In the digital version, the cross-references function as hyperlinks that can be
used to navigate through the manual by clicking on them. Example: Safety (see 2).
This manual contains the following text styles/symbols for situations that may endanger
users/engineers, cause damage to equipment or need special attention:
Note
A note gives more information on a topic.
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Caution
Obey the caution instructions to prevent damage of the water heater.
Warning
Obey the warning instructions to prevent danger of personal injury, and serious damage
to the water heater.
Document identification
Article number Language Version
0313851 EN 1.0
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Table of Contents
Preface........................................................................................3
Copyright.......................................................................... 3
Trademarks....................................................................... 3
Warranty...........................................................................3
Liability.............................................................................3
Compliance....................................................................... 4
Regulations....................................................................... 4
Contact information............................................................5
About this manual....................................................................... 7
Scope............................................................................... 7
Target group......................................................................7
Notation conventions.......................................................... 7
Document identification.......................................................8
User part.................................................................. 13
1 Introduction.............................................................................. 15
2 Safety........................................................................................17
3 Operation.................................................................................. 19
3.1 Control components..........................................................19
3.2 Operating modes..............................................................19
3.2.1 OFF mode........................................................................19
3.2.2 ON mode.........................................................................20
4 Use............................................................................................21
4.1 Turn on the water heater................................................... 21
4.1.1 Temperature setting..........................................................21
4.2 Turn off the water heater...................................................21
4.2.1 Turn off for a short period..................................................21
4.2.2 Turn off for a long period................................................... 21
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Installation, Maintenance and Service part.............. 23
5Introduction.............................................................................. 25
5.1 About the water heater..................................................... 25
5.2 Working principle..............................................................25
6 Safety........................................................................................27
6.1 Safety instructions............................................................27
6.2 Instructions on the water heater.........................................28
6.3 Safety devices..................................................................29
6.4 Environmental aspects...................................................... 31
6.4.1 Recycling.........................................................................31
6.4.2 Disposal.......................................................................... 31
7 Water heater............................................................................. 33
7.1 Structure of the water heater............................................. 33
8 Installation............................................................................... 35
8.1 Packaging........................................................................35
8.2 Conditions....................................................................... 35
8.2.1 Ambient conditions........................................................... 35
8.2.2 Maximum floor load.......................................................... 35
8.2.3 Water composition............................................................36
8.2.4 Working clearances...........................................................36
8.3 Installation diagram..........................................................37
8.4 Water connections............................................................ 37
8.4.1 Cold water connection.......................................................37
8.4.2 Hot water connection........................................................ 38
8.4.3 Circulation connection....................................................... 38
8.5 Electrical connections........................................................38
8.5.1 Preparation......................................................................39
8.5.2 Mains power.................................................................... 40
8.5.3 Finalization...................................................................... 40
8.6 Commissioning.................................................................41
8.6.1 Filling..............................................................................41
8.6.2 Turn on the water heater................................................... 41
8.7 Decommisioning...............................................................42
8.7.1 Turn off the water heater...................................................42
8.7.2 Draining.......................................................................... 42
9 Maintenance..............................................................................45
9.1 Preparation......................................................................45
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9.2 Water-side maintenance.................................................... 45
9.2.1 Inspect the anode.............................................................45
9.2.2 Descale the tank.............................................................. 46
9.3 Performance check........................................................... 47
9.4 Finalization...................................................................... 48
10 Troubleshooting........................................................................ 49
10.1 General errors..................................................................49
11 Warranty................................................................................... 51
Index........................................................................................ 53
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User part
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1 Introduction
The DRE water heater stores and heats water for sanitary purposes.
Cold water enters the tank through the water inlet (2). The heated water leaves the tank
at the top through the hot water outlet (1). When hot water is used, the tank of the water
heater is filled with the same amount of cold water.
To operate the water heater, the control thermostat, on each row of heating elements, are
used.
Fig. DRE water heater
1
2
1. Water outlet
2. Water inlet
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2 Safety
A.O. Smith cannot be held responsible for damages or injuries which can be lead back to:
• Failure to follow the instructions provided in this manual.
• Carelessness during use or maintenance of the water heater.
Every user must study the user part of this manual and must follow the instructions in this
part of the manual strictly. Do not change the sequence of the described actions. This
manual must be available for the user and service engineer at all times.
Warning
If you detect a burning smell:
• Shut off the mains power supply.
• Shut off the mains gas supply.
• Alert the emergency services.
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Caution
Do not store or use chemical substances in the room where the water heater is installed
because of the risk of explosion and corrosion of the water heater. Some propellants,
bleaching agents and degreasing agents etc. disperse of explosive vapors and/or cause
accelerated corrosion. If the water heater is used in a room where such substances are
stored or used, the warranty will be void.
Caution
Installation, maintenance and service may only by carried out by a qualified engineer.
Caution
The water heater is not intended for use by persons with reduced physical, sensory or
mental capacities, or who lack the necessary experience or knowledge. When the person
responsible for their safety is supervising or has explained how the water heater should
be used, these persons can use the water heater.
Caution
This water heater is not intended to be used by children under the age of 16. Always
supervise children, and make sure that they do not play with the water heater.
Note
Regular maintenance extends the service life of the water heater. To determine the
correct service interval, the service and maintenance engineer must do a check on the
water heater three months after installation. Based on this check, the best service
interval can be determined.
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