A.O. Smith GWV - 120 Manual

V
120
150
200
WATER PRODUCTS
COMPANY
A DIVISION OF A. O. SMITH CORPORATION
WATER PRODUCTS
COMPANY
A DIVISION OF A. O. SMITH CORPORATION
Installation
User and
Service Manual
Installation
User and
Service Manual

www.aosmithinternational.com
your installer

Instruction manual GWV 3
gis
Read this manual carefully Warning
Read this manual carefully before starting up the water heater. Failure to
read this manual and to follow the instructions in this manual may lead to
accidents, personal injury, and damage to the appliance.
Copyright © 2007 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
stated in this manual.
Trademarks Any brand names mentioned in this manual are registered trademarks of their
respective owners.
Liability A.O. Smith Water Products Company accepts no liability for claims from third
parties arising from improper use other than that stated in this manual and in
accordance with the General Conditions registered at the Eindhoven Chamber
of Commerce.
Refer further to the General Conditions. These are available on request, free of
charge.
Although considerable care has been taken to ensure a correct and suitably
comprehensive description of all relevant components, the manual may
nonetheless contain errors and inaccuracies.
Should you detect any errors or inaccuracies in the manual, we would be
grateful if you would inform us. This helps us to further improve our
documentation.
More information If you have any comments or queries concerning any aspect related to the
appliance, then please do not hesitate to contact:
A.O. Smith Water Products Company
PO Box 70
5500 AB Veldhoven
Netherlands
Telephone: (free) 0870 - AOSMITH
0870 - 267 64 84
General: [phone]
Fax: [phone]
E-mail : [e-mail]
Website: www.aosmithinternational.com
In the event of problems with connecting to the gas, electricity or water supply,
please contact your installation's supplier/installation engineer .

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Instruction manual GWV 5
Table of contents
1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - 9
1.1 About the appliance - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9
1.2 What to do if you smell gas- - - - - - - - - - - - - - - - - - - - - - - - - 9
1.3 Regulations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9
1.4 Target groups - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10
1.5 Maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10
1.6 Forms of notation - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10
1.7 Overview of this document - - - - - - - - - - - - - - - - - - - - - - - - 11
2 Working principle of the appliance- - - - - - - - - - - - - - - 13
2.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13
2.2 General working principle of the appliance - - - - - - - - - - - - - - - - 13
2.3 The appliance's heating cycle - - - - - - - - - - - - - - - - - - - - - - 15
2.4 Protection for the appliance - - - - - - - - - - - - - - - - - - - - - - - 16
2.5 Safety of the installation - - - - - - - - - - - - - - - - - - - - - - - - - 18
3 Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
3.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
3.2 Packaging - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
3.3 Environmental conditions- - - - - - - - - - - - - - - - - - - - - - - - - 20
3.4 Technical specifications - - - - - - - - - - - - - - - - - - - - - - - - - 22
3.5 Installation diagram - - - - - - - - - - - - - - - - - - - - - - - - - - - 25
3.6 Water connections, Vented- - - - - - - - - - - - - - - - - - - - - - - - 26
3.7 Water connections, Unvented - - - - - - - - - - - - - - - - - - - - - - 28
3.8 Gas connection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 29
3.9 Air supply and flue - - - - - - - - - - - - - - - - - - - - - - - - - - - - 29
3.10 Electrical connection - - - - - - - - - - - - - - - - - - - - - - - - - - - 33
3.11 Checking the supply pressure and burner pressure - - - - - - - - - - - - 36
4 Conversion to a different gas category - - - - - - - - - - - - 41
5 Filling - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43
5.1 Installation diagram - - - - - - - - - - - - - - - - - - - - - - - - - - - 43
5.2 Filling unvented installations - - - - - - - - - - - - - - - - - - - - - - - 44
5.3 Filling vented installations - - - - - - - - - - - - - - - - - - - - - - - - 45
6 Draining - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47
6.1 Installation diagram - - - - - - - - - - - - - - - - - - - - - - - - - - - 47
6.2 Draining unvented installations - - - - - - - - - - - - - - - - - - - - - - 48
6.3 Draining vented installations - - - - - - - - - - - - - - - - - - - - - - - 49
7 The control panel- - - - - - - - - - - - - - - - - - - - - - - - 51
7.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51
7.2 Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51
7.3 Meaning of icons- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51
7.4 Electronic controller ON/OFF switch - - - - - - - - - - - - - - - - - - - 51
7.5 Navigation buttons - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51
7.6 PC connection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 52
8 Status of the appliance - - - - - - - - - - - - - - - - - - - - - 53
8.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53
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6Instruction manual GWV
8.2 Operating modes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53
8.3 Error conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54
8.4 Service condition - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54
8.5 Warning - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54
9 Starting and running - - - - - - - - - - - - - - - - - - - - - - 55
9.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 55
9.2 Starting and running- - - - - - - - - - - - - - - - - - - - - - - - - - - - 55
9.3 The appliance's heating cycle - - - - - - - - - - - - - - - - - - - - - - - 55
10 Shutting down - - - - - - - - - - - - - - - - - - - - - - - - - 59
10.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 59
10.2 Shutting the installation down for a brief period ("OFF mode") - - - - - - - 59
10.3 Isolating the appliance from the mains - - - - - - - - - - - - - - - - - - - 59
10.4 Shutting the appliance and storage tank down for a long period - - - - - - 59
11 Main menu - - - - - - - - - - - - - - - - - - - - - - - - - - - 61
11.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 61
11.2 Notational convention for menu-related instructions - - - - - - - - - - - - 61
11.3 Switching on the "ON mode" - - - - - - - - - - - - - - - - - - - - - - - 61
11.4 Setting the water temperature - - - - - - - - - - - - - - - - - - - - - - - 61
11.5 Week program - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 62
11.6 Starting and stopping the week program - - - - - - - - - - - - - - - - - - 62
11.7 Changing the appliance's standard week program - - - - - - - - - - - - - 62
11.8 Adding times to a week program- - - - - - - - - - - - - - - - - - - - - - 64
11.9 Deleting times from a week program- - - - - - - - - - - - - - - - - - - - 65
11.10 Extra period- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 65
11.11 Programming an extra period - - - - - - - - - - - - - - - - - - - - - - - 66
11.12 Settings- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 67
12 Service program - - - - - - - - - - - - - - - - - - - - - - - - 69
12.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 69
12.2 Setting the hysteresis - - - - - - - - - - - - - - - - - - - - - - - - - - - 69
12.3 Displaying the error history - - - - - - - - - - - - - - - - - - - - - - - - 69
12.4 Displaying the appliance history - - - - - - - - - - - - - - - - - - - - - - 69
12.5 Displaying the appliance selection - - - - - - - - - - - - - - - - - - - - - 70
12.6 Switching the pump on or off - - - - - - - - - - - - - - - - - - - - - - - 70
12.7 Setting the service interval - - - - - - - - - - - - - - - - - - - - - - - - 70
12.8 Setting the display contrast - - - - - - - - - - - - - - - - - - - - - - - - 70
12.9 Setting the display backlight switching period - - - - - - - - - - - - - - - 70
12.10 Setting the display scroll speed - - - - - - - - - - - - - - - - - - - - - - 70
12.11 Setting the stage difference for the appliance - - - - - - - - - - - - - - - 70
12.12 Setting the pump running-on time - - - - - - - - - - - - - - - - - - - - - 71
13 Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - 73
13.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 73
13.2 Troubleshooting table for general errors - - - - - - - - - - - - - - - - - - 74
13.3 Troubleshooting table for displayed errors - - - - - - - - - - - - - - - - - 76
13.4 Warnings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 85
14 Maintenance frequency - - - - - - - - - - - - - - - - - - - - - 87
14.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87
14.2 Determining service interval - - - - - - - - - - - - - - - - - - - - - - - - 87

Instruction manual GWV 7
15 Performing maintenance - - - - - - - - - - - - - - - - - - - - 89
15.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 89
15.2 Preparation for maintenance - - - - - - - - - - - - - - - - - - - - - - - 89
15.3 Water-side maintenance - - - - - - - - - - - - - - - - - - - - - - - - - 91
15.4 Gas-side maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - 92
15.5 Finalizing maintenance- - - - - - - - - - - - - - - - - - - - - - - - - - 92
16 Warranty (certificate) - - - - - - - - - - - - - - - - - - - - - - 93
16.1 General warranty - - - - - - - - - - - - - - - - - - - - - - - - - - - - 93
16.2 Appliance warranty- - - - - - - - - - - - - - - - - - - - - - - - - - - - 93
16.3 Conditions for Installation and use - - - - - - - - - - - - - - - - - - - - 93
16.4 Exclusions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94
16.5 Scope of the warranty - - - - - - - - - - - - - - - - - - - - - - - - - - 94
16.6 Claims - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94
16.7 Obligations of A.O. Smith - - - - - - - - - - - - - - - - - - - - - - - - 94
17 Appendices- - - - - - - - - - - - - - - - - - - - - - - - - - - 95
17.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 95
17.2 Electrical diagram - - - - - - - - - - - - - - - - - - - - - - - - - - - - 96
17.3 Week program card - - - - - - - - - - - - - - - - - - - - - - - - - - - 99

Table of contents
8Instruction manual GWV

Instruction manual GWV 9
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1 Introduction
1.1 About the appliance This manual describes how to install, service and use the GWV appliance. This
appliance is a closed, gas-fired water heater with a fan in the air supply. The
appliance is always supplied together with a storage tank.
The possible categories for this appliance are C13, C33, and B23.
The information in this manual applies to the: GWV 120, GWV 150 and GWV
200.
The appliance has been manufactured and equipped in accordance with the
European standard for gas-fired storage water heaters for the production of
domestic hot water (EN 89). The appliances are therefore compliant with the
European Directive for Gas Appliances, and are entitled to bear the CE mark.
Warning
Read this manual carefully before starting up the installation. Failure to read
the manual and to follow the printed instructions may lead to personal injury and
damage to the appliance.
1.2 What to do if you
smell gas
Warning
If there is a gas smell:
No naked flames! No smoking!
Avoid causing sparks! Do not use any electrical equipment or switch, i.e. no
telephones, plugs or bells!
Open windows and doors!
Shut off the mains gas supply valve!
Warn occupants and leave the building!
After leaving the building, alert the gas distribution company or your installation
engineer.
1.3 Regulations As the (end) user, installation engineer or service and maintenance engineer,
you must ensure that the entire installation complies, as a minimum, with the
official local:
• building regulations;
• energy supplier's directives for existing gas installations;
• directives and technical guidelines for natural gas installations;
• safety requirements for low-voltage installations;
• regulations governing the supply of drinking water;
• regulations governing ventilation in buildings;
• regulations governing the supply of air for combustion;
• regulations governing the discharge of products of combustion;
• requirements for installations that consume gas;
• regulations governing indoor waste water disposal;
• regulations imposed by fire brigade, power companies and municipality.
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Introduction
10 Instruction manual GWV
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Furthermore, the installation must comply with the manufacturer's instructions.
Note
Later amendments and/or additions to all regulations, requirements and
guidelines published on or prior to the moment of installing, will apply to the
installation.
1.4 Target groups The three target groups for this manual are:
• (end) users;
• installation engineers;
• service and maintenance engineers.
Symbols on each page indicate the target groups for whom the information is
intended. See the table.
Target group symbols
1.5 Maintenance A service should be carried out at least once a year, both on the water side and
on the gas side. Maintenance frequency depends, among other things, on the
water quality, the average burning time per day and the set water temperature.
Note
To determine the correct maintenance frequency, it is recommended to
arrange for the service and maintenance engineer to check the appliance on
both the water and gas side within three months following installation. Based on
this check, the best maintenance frequency can be determined.
Note
Regular maintenance extends the service life of the appliance.
Note
Both the end user and the service and maintenance engineer are
responsible for regular maintenance. They will need to establish clear
agreements on this.
Note
If the appliance is not regularly maintained, the warranty will become void.
1.6 Forms of notation The following notation is used in this manual:
Note
Important information.
Caution
Ignoring this information can lead to the appliance being damaged.
Warning
Failure to carefully read this information may lead to personal injury and
serious damage to the appliance.
Symbol Target group
(End) user
Installation engineer
Service and maintenance engineer