A.O. Smith GWV - 120, GWV - 200, GWV - 150 User Manual

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120 150 200

Installation

User and

Service Manual

WATER PRODUCTS

COMPANY

A DIVISION OF A. O. SMITH CORPORATION

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www.aosmithinternational.com

your installer

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Read this manual carefully

Trademarks

Liability

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.

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.

Any brand names mentioned in this manual are registered trademarks of their respective owners.

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: +31 40 294 25 00

Fax: +31 40 294 25 39

E-mail : info@aosmith.nl

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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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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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

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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

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1 Introduction

1.1 About the appliance

1.2 What to do if you smell gas

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.

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!

1.3 Regulations

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.

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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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

1.5 Maintenance

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

Symbol Target group

(End) user

Installation engineer

Service and maintenance engineer

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

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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.

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1.7 Overview of this

The table provides an overview of the contents of this document.

document

Contents of this document

Chapter Target groups Description

Working principle of the appliance

Installation This chapter describes the installation activity to be

Filling This chapter describes how to fill the appliance.

Draining This chapter describes how to drain the appliance.

The control panel This chapter describes the general control of the

Status of the appliance This chapter describes the status (mode or condition) that

Starting and running This chapter describes how to start the appliance running.

Shutting down This chapter describes how to shut the appliance down for

This chapter describes how the appliance functions.

completed before you actually start up the appliance.

appliance using the display.

the appliance may have, and possible actions to take.

The general heating cycle of the appliance is also described.

a brief or long period of time.

Main menu This chapter describes the main menu of the display. This

is the actual menu for the user, however the installation engineer and service and maintenance engineers will also need to use this menu.

Service program This chapter describes the service menu. It is mainly

intended for the installation engineer and service and maintenance engineers. End users may also refer to this chapter for additional information about the appliance.

Troubleshooting This chapter is mainly intended for the installation

engineer and the service and maintenance engineer. It describes appliance errors. These errors are indicated on the display. A troubleshooting table of possible causes and solutions is provided. End users may also refer to this chapter for additional information about the appliance.

Maintenance frequency This chapter describes how to determine the optimum

frequency at which to carry out maintenance. Both the end user and the service and maintenance engineer are responsible for regular maintenance. They need to reach clear agreement on this.

Note

If the appliance is not regularly maintained, the

warranty will become void.

Performing maintenance This chapter sets out the maintenance tasks to be carried

out during a service.

Warranty (certificate) This chapter states the warranty terms and conditions.

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2 Working principle of

the appliance

2.1 Introduction

2.2 General working principle of the appliance

Topics covered in this chapter:

• General working principle of the appliance;

• The appliance's heating cycle;

• Protection for the appliance;

• Safety of the installation.

The figure shows a cut-away view of the appliance.

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Working principle of the appliance

Cut-away view of the appliance

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IMD-

18 16 15 14

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Legend

1. Hot water outlet

2. Insulation layer

3. Electrical connector block

4. Aluminium strips

5. ThermoControl (electronic

controller)

6. Flue gas discharge

7. Jacket cover plate

8. Air supply

9. Gas controls

10. Fan

11. Drain valve

12. Pressure switch

13. Air distributor plate

14. Flame probe

15. Hot surface igniter/flame probe connector

16. Injectors

17. Glow plug

18. Bar burners

19. Combustion chamber

20. Heat exchanger

21. Inspection glass

In this appliance, the cold water enters the bottom of the storage tank through the cold water inlet (24). The system pump (22) ensures that the water flows into the appliance. The water is heated by the heat exchanger (20) in the combustion chamber (19).

The heated water leaves the appliance via the return valve (26) and then, once heated, flows into the storage tank (32).

To prevent condensation from forming in the appliance, the water that flows into it via the supply line (25) must not be colder than 30 the very first time, or after it has been shut down for a long period.

Once the appliance and the storage tank are completely filled with water, they are permanently pressurised by the water pipes. As hot water is drawn from the storage tank, cold water is immediately added.

Water flows into the appliance through the ribbed elements (20). This ribbing ensures better heat transfer. There are aluminium strips (4) on these elements. These slow down the flue gases, improving the yield. The air required for combustion is forcibly delivered by the fan (10).

The appliance has two identical gas controls (9) of which one will be open (partial load) or both (full load). Thanks to the modulated supply of gas and air (8), the optimum gas/air mixture is always achieved. The flue gases are removed via the flue gas outlet pipe (6). The air supply and flue gas outlet are always in parallel.

The insulation layer (2) prevents heat loss. To protect against corrosion, the storage tank is enamelled on the inside. Anodes provide extra protection against corrosion.

For maintenance, the storage tank has an aperture for inspection and cleaning.

22. System pump:

23. Temperature sensor T

24. Cold water inlet

25. Inlet line

26. Return line

27. Return valve

28. Supply valve

29. Flow-through switch:

30. Temperature sensor T

31. Temperature sensor T

32. Storage tank

33. P-valve

C. This will only be the case

2.3 The appliance's heating cycle

The appliance uses sensor T3 (23) to determine whether the water temperature set (T (T system pump on and the flow-through switch (29) will give a signal to the controller. The appliance will ignite and the water will be heated. Once T3 gets above T the heating cycle; the system pump (22) keeps running (12.12 "Setting the

pump running-on time") for a little while.

The electronic controller assumes a certain margin when ending a heat demand. We refer to this margin as the hysteresis (12.2 "Setting the

hysteresis").

) has been reached. When T3is lower than the set water temperature

set

), the electronic controller registers a "heat demand". This will switch the

set

, the demand for heat has been met and the electronic control stops

set

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Working principle of the appliance

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2.4 Protection for the appliance

2.4.1 Introduction

The electronic controller monitors the water temperature and ensures safe combustion. This is achieved by:

• the Water temperature protection

• the Gas control

• the Fan

• the Pressure switch

• the Flame probe

• the Flow-through switch

2.4.2 Water temperature protection

The electronic controller monitors the water temperature with temperature sensors T

Temperature protection

Safety Description

, T2, T3 > 98°C The appliance switches back to partial load once the heat demand has been

For additional safety

, T2, T3 > 99°C

met.

A lockout error of the appliance occurs. The controller must be manually reset before the appliance can resume operation (8.3 "Error conditions"). The reset may only be performed if T

, T2 and T3 as shown in the table.

< 90°C.

2.4.3 Gas control

When heat is required, the controller (5) opens the left-hand gas control (9) so that the gas can flow into the premix bar burners (18) of the first tray of burners. The air is mixed in with the gas at the front of the burners. The hot surface igniter (17) ignites the leftmost burner. The adjacent burners then ignite from left to right.

If more heat is demanded, the controller opens the second gas control (9) as well. There is no separate igniter for the ignition of the second tray of burners.

The gas controls have two valves as safety devices. The valves shut off the gas supply.

Smooth ignition is achieved by opening the gas controls with a delay ("softlite").

2.4.4 Fan

The fan (10) provides an optimum air supply (8) when there is a heat demand. This air comes into a separate chamber on the air distribution plate (13). Overpressure is created in the space and the air can only escape the appliance via the premix bar burners (18).

As a safety feature, the fan ensures that any gases present in the combustion chamber are removed, both before and after combustion. We refer to this as pre-purge and post-purge.

The fan speed is continuously monitored by the electronic controller (5). The electronic controller takes control if the speed of rotation varies too much from the set value.

2.4.5 Pressure switch

The pressure switch (12) guarantees the air supply during pre-purging and when the appliance is operational. The standard position of the pressure switch is open. When sufficient pressure difference is reached, the pressure switch closes. However, in the event of a fault, the pressure switch is tripped open, and the heating cycle is interrupted.

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Pressure measurements are made at the air distribution plate (high pressure) and in a Venturi in the burners (low pressure).

The table shows the trip point per appliance.

Note

The trip point of the pressure switch is not adjustable.

Pressure switch trip points

Appliance Closing pressure

differential

GWV 120 >

GWV 150 >

GWV 200 >

80 Pa < 66 Pa

89 Pa < 75 Pa

107 Pa < 92 Pa

2.4.6 Flame probe

To ensure that no gas can flow when there is no combustion, the water heater has a flame probe (14). The electronic controller uses this probe for flame detection, by means of ionisation detection. The electronic control closes the gas valve as soon as it detects that no flame is present.

2.4.7 Flow-through switch

the flow-through switch (29) guarantees the flow of water through the appliance (before operation and while the appliance is running). The standard position of the flow-through switch is open. When the flow is sufficient, the switch closes and the heating cycle starts. If the flow of water through the appliance gets too low, then the switch opens, which interrupts the heating cycle; this is to prevent overheating.

Flow measurement is done in the return line between the appliance and the storage tank.

Opening pressure differential

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2.5 Safety of the installation

2.5.1 Unvented installation

2.5.2 Vented installation

Working principle of the appliance

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As well as the standard safeties in the appliance (2.4 "Protection for the

appliance"), it must also be protected by an inlet combination and a pressure-

reducing valve. A P-valve is also used.

With unvented installation, an expansion valve and expansion vessel prevent excessive pressure in appliance. This prevents damage being caused to the enamelled coating (in the appliance) or to the heat exchanger. A non-return valve prevents excessive pressure build-up in the water supply system. This valve also prevents water from flowing backwards from the storage tank into the cold water supply system. The pressure-reducing valve protects the installation against excessively high water supply pressures (> 8 bar). These components are fitted (3.6 "Water connections, Vented") to the cold water pipe.

With a vented installation, excess pressure is taken up by the open water tank. The height of the head tank determines the working pressure in the appliance, which may not exceed 8 bar. The appliance must also be fitted with a vent pipe from the hot water pipe, which opens into the cold water tank.

Normally, the vent pipe should discharge into a separate discharge channel/drain or otherwise to the open cold water head tank. The appliance should also be fitted with a stop valve (3.6.2 "Hot water side") on the hot water side.

2.5.3 Inlet combination and pressure-reducing valve

An excessively high pressure in the storage tank can damage the enamelled layer. An inlet combination and pressure-reducing valve prevents this. The inlet combination acts as a stop valve, non-return valve and overflow valve. If the water supply pressure is too high (> 8 bar), a pressure-reducing valve must be used. Both components must be fitted in the cold water supply (3.6 "Water

connections, Vented").

2.5.4 P-valve

The appliance has a P-valve (33) as standard. A P-valve (Pressure Relief Valve) monitors the pressure in the installation. If the pressure gets too high (> 10 bar), the valve will open. The water can now flow out of the installation. Because the installation is under water supply pressure, cold water will automatically flow into the storage tank. The valve remains open until the unsafe situation (< 10 bar) has been resolved.

18 Instruction manual GWV

Page 19

3 Installation

Warning

Installation work should be carried out by an approved installation engineer in compliance with the general and local regulations imposed by the gas, water and power supply companies and the fire service.

The appliance may only be installed in a room that complies with the requirements stated in national and local ventilation regulations (1.3 "Regulations").

3.1 Introduction

3.2 Packaging

This chapter describes the installation activities to be carried out before you actually start using the appliance (9 "Starting and running"), namely:

• Packaging;

• Environmental conditions;

• Technical specifications;

• Installation diagram;

• Water connections, Vented,

• Gas connection;

• Air supply and flue;

• Electrical connection;

• Checking the supply pressure and burner pressure.

For a possible conversion to a different gas category, see conversion (4 "Conversion to a different gas category").

To avoid damaging the appliance, remove the packaging carefully.

We recommend unpacking the appliance at or near its intended location.

Caution

The appliance may only be manoeuvred in an upright position. Take care that the appliance is not damaged after unpacking.

Instruction manual GWV 19

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Installation

3.3 Environmental conditions

Caution

An open appliance may not be used in rooms where chemical substances are stored or used due to the risk of explosion and corrosion of the appliance. Some propellants, bleaching agents and degreasing agents etc. disperse vapours that are explosive and/or cause accelerated corrosion. If the appliance is used in a room in which such substances are present, the warranty will be void.

The appliance is suitable for both open and closed combustion.

For closed combustion, the air supply required is independent of the room in which it is installed. In this event, there are no additional ventilation requirements. Appliance types possible here are C13 and C33.

The appliances can also be installed as open appliances and may then only be placed in an open boiler room. The appliance type is B23.

3.3.1 Air humidity and ambient temperature

The boiler room must be frost-free, or be protected against frost. The table shows the environmental conditions that must be adhered to for correct functioning of the electronics present in the appliance to be guaranteed.

Air humidity and ambient temperature specifications

Air humidity and ambient temperature

Air humidity max. 93% RV at +25°C

Ambient temperature Functional: 0 <

T < 60°C

3.3.2 Maximum floor loading

Allow for the weight of the appliance and the storage tank with respect to the maximum floor loading; refer to the tables.

Specifications of the weight of the appliance, with respect to the maximum floor loads.

Weight of the appliance (kg)

GWV 120 225

GWV 150 250

GWV 200 300

Specifications of the weight of the storage tank, with respect to the maximum floor loads.

Weight of the storage tank filled with water (kg)

ST 400 505

ST 500 630

ST 600 855

ST 750 965

ST 1000 1315

20 Instruction manual GWV

Page 21

3.3.3 Water composition

The appliance is intended for heating drinking water. The drinking water must comply with the regulations governing drinking water for human consumption. The table gives an overview of the specifications.

Water specifications

Water composition

Hardness (alkaline earth ions)

Conductivity > 125 µS/cm

Acidity (pH value) 7,0 < pH value < 9.5

Note

If the water specifications deviate from those stated in the table, the storage

tank protection cannot be guaranteed (16 "Warranty (certificate)").

If the water hardness is greater than 4° dH, please contact A.O. Smith.

3.3.4 Working clearances

For access to the appliance and the storage tank it is recommended that the following clearances are observed:

• Around the appliance and the storage tank: 50 cm.

• Above the storage tank (room to replace the anodes):

- 100 cm if using fixed anodes, or

- 50 cm if using flexible anodes.

If the available clearance is less than 100 cm, flexible magnesium anodes may be ordered.

> 1.00 mmol/l:

• German hardness > 5.6° dH

• French hardness > 10.0° fH

• British hardness > 7.0° eH

Note

When installing the appliance and storage tank, be aware that any leakage can cause damage to the immediate environment or floors below. If this is the case, the appliance should be installed above a wastewater drain or in a suitable metal leak tray.

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Installation

3.4 Technical specifications

3.4.1 Dimensions of the appliance

Check the dimensions (3.4.1 "Dimensions of the appliance"), the gas data (3.4.3 "Gas data") and other specifications (3.4.2 "General and electrical

specifications") of the appliance.

Plan and elevation of the appliance

IMD-0483 R

22 Instruction manual GWV

Page 23

Dimensions (all measurements in mm unless otherwise indicated)

Size Description GWV 120 GWV 150 GWV 200

A Overall height 835 835 835

B Height of pump connection + heat

exchanger outlet

C Length of appliance 910 1065 1465

D Length including flow switch 1230 1495 1895

E Width of appliance 625 625 625

F Air supply diameter 150 150 200

G Diameter of flue gas discharge 150 150 200

H Centre-to-centre distance between air

supply/flue gas outlet

I Air supply distance 160 240 260

J Air supply/flue gas discharge distance 185 185 185

K Height of gas connection 760 760 760

L Height of drain valve connection 345 345 345

M Length including pump 1500 1680 2100

1 Supply connection (external) R 1

2 Return connection (internal) Rp 1

3 Gas connection (external) R 1 R 1 R 1

4 Drain valve connection (internal)

5 P-valve connection (internal)

350 350 350

300 300 480

/4"

R 2 R 2

Rp 2 Rp 2

/4"

3.4.2 General and electrical specifications

Chimney data

Chimney

Not insulated (max. length) m 8 8 8

Not insulated (number of bends) - 2 2 2

Not insulated with condensation removal (max. length)

Not insulated with condensation removal (number of bends)

Insulated (max. length) m 20 20 20

Insulated (number of bends) - 2 2 2

Tap capacity (Tcold = 10°C) Unit GWV 120 GWV 150 GWV 200

Maximum temperature regulated °C 85 85 85

continuous ∆T=28°C l/h 3041 3787 4838

continuous ∆T=44°C l/h 1935 2410 3078

continuous ∆T=50°C l/h 1703 2121 2709

continuous ∆T=55°C l/h 1548 1928 2463

continuous ∆T=70°C l/h 1216 1515 1935

1) Stated lengths and bends apply for both flue gas removal and air supply

Tap capacity

Unit GWV 120 GWV 150 GWV 200

m202020

-222

Instruction manual GWV 23

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Installation

Contact ratings

Unit GWV 120 GWV 150 GWV 200

Electrical power consumption W 200 210 350

Supply voltage VAC 230 (+10 -15%) - 50Hz

Operating pressure

Unit GWV 120 GWV 150 GWV 200

Operating pressure bar 8 8 8

3.4.3 Gas data

Gas data

Description II

Gas category 2H: G20 - 20 mbar

Orifice diameter mm 2,31 2,31 2,31

(1) = Blank plate (2) = Burner pressure regulator

Nominal load (upper value) kW 122,2 152,1 194,3

Nominal output kW 99,0 123,3 157,5

Supply pressure mbar 20 20 20

Burner pressure mbar 2 x 8.9 2 x 9.3 2 x 8.0

Gas consumption* m

Number of burners (total) - 8 10 15

Gas category 3P: G31 – 37 mbar

Orifice diameter mm 1,50 1,50 1,50

(1) = Blank plate (2) = Burner pressure regulator (3) = High/low regulator

Nominal load (upper value) kW 111,1 138,8 216,6

Nominal output kW 90,0 112,5 175,5

Supply pressure mbar 37 37 37

Burner pressure mbar 2 x 13.3 2 x 12.7 2 x 14.5

Gas consumption kg/h 7,8 9,7 15,1

Number of burners (total) - 8 10 15

* Gas consumption at 15°C and 1013.25 mbar

2H3P

Unit GWV 120 GWV 150 GWV 200

222

/h 11,5 14,3 18,4

222

24 Instruction manual GWV

Page 25

3.5 Installation diagram

Unvented

This figure shows the installation diagram. This diagram is used in the sections in which the actual connection process is described.

Installation diagram

14 14 14

Vented

IMD-0486 R2

14 14 14

IMD-0487 R2

Instruction manual GWV 25

Page 26

Legend

Only applicable numbers are mentioned.

1. pressure-reducing valve (mandatory if the mains

water pressure exceeds 8 bar)

2. inlet combination (mandatory)

3. expansion valve

4. stop valve (recommended)

5. non-return valve (mandatory)

6. circulation pump (optional)

9. drain valve

10. manual gas valve (mandatory)

11. service stop valve

12. temperature gauge (recommended)

Installation

14. hot water draw-off points

15. expansion valve (mandatory)

16. expansion vessel (mandatory)

18. water tank

19. float valve

23. P-valve A. cold water supply B. hot water supply C. circulation pipe D. gas supply E. overflow pipe H. overflow safety

3.6 Water connections, Vented

3.6.1 Cold water side

3.6.2 Hot water side

3.6.3 Circulation pipe

Warning

The installation should be carried out by an authorised installation engineer,

in compliance with general and local regulations (1.3 "Regulations").

See (A) in the installation diagram (3.5 "Installation diagram").

1. Fit an approved stop valve (4) on the cold water side between the cold water head tank (18) and the appliance, as required by regulations (1.3 "Regulations").

See (B) in the installation diagram (3.5 "Installation diagram").

Note

Insulating long hot water pipes prevents unnecessary energy loss.

1. Fit the T&P valve (3).

2. Optional: fit a temperature gauge (12) so you can check the temperature of the tap water.

3. Fit a stop valve (11) in the hot water outlet pipe for servicing.

4. If a circulation pipe is required, continue by installing the circulation pipe (3.6.3 "Circulation pipe").

See (C) in the installation diagram (3.5 "Installation diagram").

If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort and reduces water wastage.

1. Fit a circulation pump (6) of the correct capacity for the length and resistance of the circulation system.

2. Fit a non-return valve (5) behind the circulation pump to guarantee the direction of circulation.

3. Fit two stop valves for service purposes (4).

4. Connect the circulation pipe up to a connection of the storage tank.

3.6.4 System pump

The pump revs can be set using an adjuster unit. This setting depends on the length of the pipes X between the storage tank and the appliance.

26 Instruction manual GWV

Page 27

Distance X

GWV 120 GWV 150 GWV 200

Pipe diameter Ø 42 (1

Distance X

/2") Ø 54 (2") Ø 54 (2")

• 0 < X < 2 metres, rev setting 1

• 2 < X < 4 metres, rev setting 2

• 4 < X < 6 metres, rev setting 3

You set the revs using the pump's adjuster unit. Proceed as follows:

1. Unscrew the pump's cap.

2. The pump's adjuster unit can be seen.

3. Take the adjuster unit out.

4. Remove the cap of the adjuster unit.

IMD-0519 R

5. Turn the adjuster unit so that the number of the rev setting required can be seen.

Instruction manual GWV 27

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Installation

IMD-0520 R

6. Put the cap back on the adjuster unit.

7. Insert the adjuster unit back in the pump.

8. Fit the cap back on the pump.

3.7 Water connections, Unvented

3.7.1 Cold water side

3.7.2 Hot water side

Warning

The installation should be carried out by an authorised installation engineer,

in compliance with general and local regulations (1.3 "Regulations").

See (A) in the installation diagram (3.5 "Installation diagram").

1. Fit an approved stop valve (4) on the cold water side as required by applicable regulations (1.3 "Regulations").

2. The maximum working pressure of the appliance is 8 bar. Because the pressure in the water pipe at times can exceed 8 bar, you must fit an approved pressure-reducing valve (1).

3. Fit a non-return valve (5) and an expansion vessel (16).

4. Fit an expansion valve (15) and connect the overflow side to an open wastewater pipe.

See (B) in the installation diagram (3.5 "Installation diagram").

Note

Insulating long hot water pipes will prevent unnecessary energy loss.

1. Optional: fit a temperature gauge (12) so you can check the temperature of the tap water.

2. Fit the T&P valve (3).

3. Fit a stop valve (11) in the hot water outlet pipe for servicing.

3.7.3 Circulation pipe

See (C) in the installation diagram (3.5 "Installation diagram").

If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort and reduces water wastage.

1. Fit a circulation pump (6) of the correct capacity for the length and resistance of the circulation system.

2. Fit a non-return valve (5) behind the circulation pump to guarantee the direction of circulation.

3. Fit two stop valves for service purposes (4).

4. Connect the circulation pipe up to a connection of the storage tank

28 Instruction manual GWV

Page 29

3.8 Gas connection

3.9 Air supply and flue

3.9.1 Introduction

Warning

The installation should be carried out by an authorised installation engineer,

in compliance with general and local regulations (1.3 "Regulations").

Caution

Make sure that the diameter and length of the gas supply pipe are large

enough to supply sufficient capacity to the appliance.

See (D) in the installation diagram (3.5 "Installation diagram").

1. Fit a manual gas valve (10) in the gas supply pipe.

2. Blow the gas pipe clean before use.

3. Close the gas system.

4. Fit the gas supply pipe to the gas system.

Warning

After fitting, check for leaks.

This section covers the following subjects:

• Requirements for flue gas discharge materials

• Parallel connections

• Specifications

3.9.2 Requirements for flue gas discharge materials

Warning

Installation must be carried out by an authorised installation engineer, in

compliance with general and local regulations (1.3 "Regulations").

Types of appliances

The appliances are approved for appliance types C13, C33 and B23. The figure and table give information about appliance types C13 and C33. For an explanation of the possibilities, please contact the manufacturer.

Instruction manual GWV 29

Page 30

0503 R0

Installation

C13: appliance with wall conduit

IMD-

C33: appliance with roof conduit

IMD-0509 R0

Note

Make sure that the chimney discharges into an area where this is permitted

for this category of appliance.

30 Instruction manual GWV

Page 31

3.9.3 Parallel connections

The air supply duct and flue gas outlet duct for the GWV 120, 150 and 200 exit the appliance separately. They must be connected (3.9.2 "Requirements for

flue gas discharge materials") to the concentric wall conduit or roof conduit

using a transition piece.

The following requirements must also be fulfilled:

• The maximum allowed chimney length (A+B (C)) has the following dimensions:

- 8 metres of uninsulated pipe including 2 bends;

- 20 metres of uninsulated pipe including 2 bends. With a condensation

outlet in the flue gas outlet, within 8 metres of the appliance;

- 20 metres of insulated pipe including 2 bends;

Caution

Contact the supplier for the installation of an insulated pipe.

• maximum number of 45° or 90° bends allowed is 2.

• If you make use of horizontal piping, then this must slope towards the appliance at a minimum of 5 mm per metre running length!

• The transition piece to convert the air supply and flue gas discharge from parallel to concentric must be placed immediately before the roof or wall flue terminal.

• The duct length of the air supply must be approximately the same as that of the flue gas discharge chimney. Make sure that the chimney discharges into an area where this is permitted for this type of appliance.

3.9.4 Specifications

Note

For C13 and C33-category appliances, we prescribe the use of a roof or wall conduit approved for the appliance. Use of an incorrect roof or wall flue conduit can cause the installation to malfunction.

Instruction manual GWV 31

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Installation

Specifications for transition piece and concentric wall flue terminal (C13)

Subject Description

Wall flue terminal set:

• 1x wall flue terminal (incl. transition piece)

• 1x wall plate

• 1x clamping ring

• 2x pipe, 500mm

• 3x bend, 90°

Pipe material Construction Parallel

Pipe diameters Flue gas

No other wall flue terminal is permitted. Use this item number to order the wall conduit set from supplier,

manufacturer or wholesaler.

Item No. GWV 120: 0308 241

GWV 150: 0308 241 GWV 200: 0308 242

Construction Concentric

Manufacturer Muelink & Grol

Type GWV 120: M2000 MDV SE 150

GWV 150: M2000 MDV SE 150 GWV 200: M2000 MDV SE 200

Flue gas discharge

Air supply Thick-walled aluminium with lipped sealing ring

discharge

Air supply GWV 120: Ø 150 mm

Thick-walled aluminium with lipped sealing ring

GWV 120: Ø 150 mm GWV 150: Ø 150 mm GWV 200: Ø 200 mm

GWV 150: Ø 150 mm GWV 200: Ø 200 mm

Specifications for transition piece and concentric roof conduit (C33)

Subject Description

Roof flue terminal set:

• 1x roof flue terminal (incl. transition piece)

• 1x adhesive sheet

• 1x clamping ring

• 2x pipe, 1000 mm

• 1x bend, 90°

Pipe material Construction Parallel

Pipe diameters Flue gas

No other wall flue terminal is permitted. Use this item number to order the wall conduit set from supplier,

manufacturer or wholesaler.

Item No. GWV 120: 0308 239

GWV 150: 0308 239 GWV 200: 0308 240

Construction Concentric

Manufacturer Muelink & Grol

Type GWV 120: DDV-VR 150/150-150/220

GWV 150: DDV-VR 150/150-150/220 GWV 200: DDV-VR 200/200-200/300

Flue gas discharge

Air supply Thick-walled aluminium with lipped sealing ring

discharge

Air supply GWV 120: Ø 150 mm

Thick-walled aluminium with lipped sealing ring

GWV 120: Ø 150 mm GWV 150: Ø 150 mm GWV 200: Ø 200 mm

GWV 150: Ø 150 mm GWV 200: Ø 200 mm

32 Instruction manual GWV

Page 33

Specification of condensation outlet for uninsulated lengths greater than 8 metres and no more than 20 metres

Subject Description

Condensation outlet set

• 1x clamping ring

•1x trap

• 2x pipe Ø 32x500 mm

• 2x bend, Ø 32 90

Pipe material Construction Parallel

Pipe diameters Outlet GWV 120: Ø 150 mm

Item No. GWV 120: 0308 278

GWV 150: 0308 278 GWV 200: 0308 279

Construction n/a

Manufacturer Muelink & Grol

Type n/a

Outlet Thick-walled aluminium with lipped sealing ring

GWV 150: Ø 150 mm GWV 200: Ø 200 mm

3.10 Electrical connection

Warning

The installation should be carried out by an authorised installation engineer,

in compliance with general and local regulations (1.3 "Regulations").

3.10.1 Introduction

Topics covered in this paragraph, in sequence:

• Preparation;

• Connecting the mains voltage;

A program-controlled pump, and external on/off switch and an alarm can optionally be fitted to the appliance. For these options, see:

• Connecting a program-controlled pump;

• Connecting an external on/off switch;

• Connecting an alarm signal ('Alarm OUT');

• Sensor wiring

Note

The optional components are not included in the rating for electrical power

consumption stated in the table (3.4.2 "General and electrical specifications").

3.10.2 Preparation

Caution

The appliance is phase-sensitive. It is absolutely essential to connect the mains live (L) to the live of the appliance, and the mains neutral (N) to the neutral of the appliance.

The figure shows a view of the electrical connector block, and the table shows the appropriate connections.

Instruction manual GWV 33

Page 34

050

Legend

A. screws B. protector plate C. connector block

Installation

Connector block

IMD-

As part of the preparations, you should first remove the protective plate from the electrical section.

1. Loosen the 2 screws (A) of the electrical section, and remove the protective cap (B) from the electrical section. The connector block (C) is now visible.

Note

Consult the table for the connections and consult the electrical diagram for

the electrical component connections.

4 R1

34 Instruction manual GWV

Page 35

Electrical connector block

19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

7X6X5X4

Terminal Name Function

19 Earth connection

18 X

17 X

16 X

15 X

14 Earth connection

13 X

12 X

11 Earth connection

10 X

9N Program-controlled pump

6N System pump

3N Mains voltage (230VAC-50Hz)

External on/off switch

n/a

Alarm signal

n/a

X3X

X1NL

3.10.3 Connecting the mains voltage

The appliance is supplied without a power cable and isolator.

Note

To provide the appliance with voltage, the appliance must be permanently connected to the mains voltage. A double-pole isolator with a contact gap of at least 3 mm must be fitted between this permanent connection and the appliance. The power cable must have cores of at least 3 x 1.0 mm2.

Warning

Leave the appliance isolated until you are ready to start it up.

1. Pass the power cable through the right-hand strain relief.

2. Connect the cable to terminals 1-2-3 of the DIN rail.

3. Connect the power cable to the double-pole isolator.

4. If you do not need to make any more connections:

- Fit the protector plate onto the electrical connector block.

3.10.4 Connecting a program-controlled pump

1. Pass the cable through the third strain relief from the right.

2. Connect the cable to terminals 7-8-9 of the DIN rail.

3. Connect the wire up to the pump.

Instruction manual GWV 35

Page 36

Installation

4. If you do not need to make any more connections:

- Fit the protector plate onto the electrical connector block.

3.10.5 Connecting an external on/off switch

There is an option for connecting an external ON/OFF switch. In the OFF position, the programmed operating state is active. In the ON position, the programmed operating mode is overruled, and the "ON mode" is active.

1. Pass the power cable through the left-hand strain relief.

2. Connect the cables (X table (3.10.2 "Preparation").

3. Connect the wires up to the external switch.

4. If you do not need to make any more connections:

- Fit the protector plate onto the electrical connector block.

3.10.6 Connecting an alarm signal ('Alarm OUT')

Alarm OUT is a potential free terminal that is switched when an error is detected. This can be used to signal errors, for example with a bulb. A 230V circuit can be powered directly. For other voltages, a specific relay prescribed by AO Smith is required.

1. Pass the lead through the strain relief.

2. Connect the phase cables (X to the table on page 34. If required, connect earth ( ) to terminal 11.

3. Connect the wires up to the fault sensor.

4. If you do not need to make any more connections:

- Fit the protector plate onto the electrical connector block.

and X6) to terminals 17 and 18 according to the

and X3) up to terminals 12 and 13 according

3.10.7 Sensor wiring

3.11 Checking the supply pressure and burner pressure

Four connectors are fitted to the left-hand side of the appliance. These connectors connect four components up to the electronic controller. From top to bottom, these are:

• Flow-through switch

• Storage tank

• Cold water in

• Hot water out

The wiring to these components is assembled in the factory. Only the wire to the storage tank still needs connecting up to the sensor.

Note

Before starting the appliance and/or checking the supply pressure and

burner pressure, you must fill (5 "Filling") the appliance.

Caution

Before starting up for the first time or after conversion, you must always

check the supply pressure and burner pressure.

Note

The easiest way to check the gas pressures is by using two pressure

gauges. This procedure assumes that these two gauges are available.

36 Instruction manual GWV

Page 37

Legend

Only applicable numbers are mentioned.

1. supply pressure test nipple

2. burner pressure test nipple

3. burner pressure regulator

4. burner pressure control cap

5. burner pressure control

adjusting screw

Gas control

3.11.1 Preparation

To check the supply pressure and burner pressure, proceed as follows:

1. Isolate (10.3 "Isolating the appliance from the mains") the appliance from the power supply.

2. Undo the screws of the front cover.

3.11.2 Procedure for checking pressures

1. There are two test nipples on both gas controls:

- a supply pressure nipple (1)

- a burner pressure nipple (2)

Sealing screws are located inside the test nipples. Loosen both sealing screws by a few turns. Do no completely undo them, as it may be awkward retightening them.

2. Connect a pressure gauge to the burner pressure nipple (2).

3. Open the gas supply and vent the gas supply line through the supply pressure nipple (1).

4. Connect a pressure gauge to the supply pressure nipple (1) when gas starts to flow from this nipple.

5. Switch on the power to the appliance using the isolator on the appliance.

6. Switch the electronic controller ON by setting the 0/I switch to position I.

IMD-0510 R

Instruction manual GWV 37

Page 38

Installation

The display will now show go to the main menu.

INTERNAL CHECK

GENE SI S

IMD-0511 R1

INTERNAL CHECK

for about 10 seconds and

MENU »OFF ^ ON È WEEK PROGRAM

7. Activate the "ON mode" by going through the following steps:

- Press the blue arrow once ( ) to position the cursor in front of press . The display shown here will appear.

»START OPERATION ^ CHANGE SETPOINT È Tset=65C

- Confirm the

The appliance is now in the "ON mode" and will ignite.

8. When the display shows the text minute before reading the dynamic pressures (the fan needs this time to run up to full rotational speed).

9. Use the pressure gauge to read the supply pressure at the test nipple (1) (3.4.3 "Gas data").

Note

Consult the mains gas supply company if the supply pressure is not correct.

10. Use the pressure gauge to read the burner pressure at nipple (2) (3.4.3 "Gas data").

If the burner pressure is not correct, you can adjust the pressure according to the procedure (3.11.3 "Adjusting the pressure").

START OPERATION

RUNNING 2

by pressing .

, you must wait about 1

and

3.11.3 Adjusting the pressure

1. Remove the cap (4) from the burner pressure regulator (3).

2. Correct the burner pressure by turning the adjusting screw (5), depending on the correction required:

- Adjustment screw anticlockwise: burner pressure decreases.

- Adjustment screw clockwise: burner pressure increases.

38 Instruction manual GWV

Page 39

3. Cover the opening of the adjusting screw and check the burner pressure against the value given in the gas table (3.4.3 "Gas data").

4. If the pressure is not set correctly, repeat the preceding steps until the correct pressure is attained.

5. Fit the cap (4) back on the burner pressure regulator.

6. Activate the "OFF mode" of the electronic controller:

MENU »OFF ^ ON È WEEK PROGRAM

7. If the press .

- Use and to place the cursor beside

- Confirm with .

8. Wait until the fan has stopped, and switch the electronic controller off.

Caution Failure to wait until the fan stops can cause damage to the appliance.

9. Finish off (3.11.4 "Finalising").

is not displayed:

OFF

3.11.4 Finalising

1. Shut off the gas supply.

2. Disconnect the two pressure gauges and retighten the sealing screws in the test nipples in the gas controls.

3. Put the front panel back.

Note

Before starting the appliance up, take time to fill in the warranty card supplied with the appliance. This enables us to guarantee the quality of our systems, and to further enhance our warranty procedure.

Please return this card as soon as possible. Your customer will then receive a warranty certificate with our warranty conditions.

Instruction manual GWV 39

Page 40

Installation

40 Instruction manual GWV

Page 41

4 Conversion to a

different gas category

Caution

The conversion may only by carried out by an authorised installation

engineer.

If the appliance must operate on a family of gases (LP gas or natural gas) or other gas category than that for which the appliance has been set at the factory, the appliance will have be adapted using a special conversion kit.

Caution

You must check the supply pressure and burner pressure once the

conversion is complete.

The conversion instructions are not part of this manual.

Contact A.O. Smith if conversion is needed.

Instruction manual GWV 41

Page 42

Conversion to a different gas category

42 Instruction manual GWV

Page 43

gis

5 Filling

5.1 Installation diagram

Unvented

This figure shows the installation diagram. This diagram is used in the sections in which the actual connection process is described.

Installation diagram

14 14 14

IMD-0486 R2

Instruction manual GWV 43

Page 44

Ven ted

Filling

gis

14 14 14

Legend

Only applicable numbers are mentioned.

1. pressure-reducing valve (mandatory if the mains water pressure exceeds 8 bar)

2. inlet combination (mandatory)

3. expansion valve

4. stop valve (recommended)

5. non-return valve (mandatory)

6. circulation pump (optional)

9. drain valve

10. manual gas valve (mandatory)

11. service stop valve

12. temperature gauge (recommended)

5.2 Filling unvented

installations

To fill the appliance, proceed as follows:

1. Open the stop valve (11) in the hot water pipe and, if present, the stop valves (4) for the circulation pump (6).

2. Close the drain valve (9).

3. Open the nearest hot water draw-off point (14).

4. Open the stop valves (11) between the storage tank and the appliance.

5. Open the stop valve (4) on the cold water side (A) so that cold water flows into the appliance.

6. Completely fill the appliance. When a full water jet flows from the nearest draw-off point, the appliance is full.

7. Bleed the entire installation of air, for example by opening all draw-off points.

8. Bleed the pump.

14. hot water draw-off points

15. expansion valve (mandatory)

16. expansion vessel (mandatory)

18. water tank

19. float valve

23. P-valve A. cold water supply B. hot water supply C. circulation pipe D. gas supply E. overflow pipe H. overflow safety

IMD-0487 R2

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9. The appliance is now under water supply pressure. There should be no water coming out of the expansion valve (15) or out of the P-valve (23). If there is, the cause might be:

- The water supply pressure is greater than the specified 8 bar.

Rectify this by fitting a pressure reducing valve (1).

- The expansion valve in the protected cold supply setup is defective or

incorrectly fitted.

5.3 Filling vented installations

To fill the appliance, proceed as follows:

1. Open the stop valve (11) in the hot water pipe and, if present, the stop valves (4) for the circulation pump (6).

2. Close the drain valve (9).

3. Open the nearest hot water draw-off point (14).

4. Open the stop valves (11) between the storage tank and the appliance.

5. Open the stop valve (4) on the cold water side (A) so that cold water flows into the appliance.

6. Completely fill the appliance. When a full water jet flows from the nearest draw-off point, the appliance is full.

7. Bleed the entire installation of air, for example by opening all draw-off points.

8. Bleed the pump.

9. The appliance is now under water supply pressure. There should be no water coming out of the P-valve (23). If this does happen, the P-valve might be defective or incorrectly fitted.

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6 Draining

6.1 Installation diagram

Unvented

This figure shows the installation diagram. This diagram is used in the sections in which the actual connection process is described.

Installation diagram

14 14 14

IMD-0486 R2

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Ven ted

Draining

gis

14 14 14

Legend

Only applicable numbers are mentioned.

1. pressure-reducing valve (mandatory if the mains water pressure exceeds 8 bar)

2. inlet combination (mandatory)

3. expansion valve

4. stop valve (recommended)

5. non-return valve (mandatory)

6. circulation pump (optional)

9. drain valve

10. manual gas valve (mandatory)

11. service stop valve

12. temperature gauge (recommended)

6.2 Draining unvented

installations

Some service activities require the appliance to be drained. The procedure is as follows:

1. Activate the

14. hot water draw-off points

15. expansion valve (mandatory)

16. expansion vessel (mandatory)

18. water tank

19. float valve

23. P-valve A. cold water supply B. hot water supply C. circulation pipe D. gas supply E. overflow pipe H. overflow safety

with .

IMD-0487 R2

MENU »OFF ^ ON È WEEK PROGRAM

OFF

2. Position the cursor in front of

OFF

3. Confirm

with .

4. Wait until the fan has stopped. The symbol is then dimmed.

Caution Failure to wait until the fan stops purging can cause damage to the

appliance.

48 Instruction manual GWV

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5. Switch the appliance OFF (position 0) using the ON/OFF switch on the control panel.

GENES I S

IMD-0511 R 1

6. Isolate the water heater from the power supply by putting the isolator between the appliance and the mains power supply to position 0.

7. Shut off the gas supply (10).

8. Close the stop valve (11) in the hot water pipe.

9. Close the supply valve (4) in the cold water supply (A).

10. Open the drain valve (9).

11. Bleed the appliance (or installation) so that it drains completely.

6.3 Draining vented installations

Some service activities require the appliance to be drained. The procedure is as follows:

1. Activate the

2. Position the cursor in front of

3. Confirm

4. Wait until the fan has stopped. The symbol is then dimmed.

Caution Failure to wait until the fan stops purging can cause damage to the

appliance.

5. Switch the appliance OFF (position 0) using the ON/OFF switch on the control panel.

OFF

with .

GENES I S

OFF

IMD-0511 R 1

6. Isolate the water heater from the power supply by putting the isolator between the appliance and the mains power supply to position 0.

7. Shut off the gas supply (10).

8. Close the stop valve (11) in the hot water pipe.

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9. Close the stop valve (4) between the water tank and the cold water inlet (A).

10. Open the drain valve (9).

11. Bleed the appliance (or installation) so that it drains completely.

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7 The control panel

7.1 Introduction

Topics covered in this chapter:

• Operation;

• Meaning of icons;

• Electronic controller ON/OFF switch;

• Navigation buttons;

• PC connection.

7.2 Operation

The entire appliance is controlled and monitored by the ThermoControl (the electronic control).The figure shows the electronic controller.

GENE SI S

^»START OPERATION È CHANGE SETPOINT

Tset=70ÉC

7.3 Meaning of icons

The table explains the meanings of the icons.

Icons and their meaning

Name Meaning

Heat demand Heat demand detected

Purge Pre- and post-purge using

fan

Pressure switch Pressure switch is closed

Glowing (Pre)glow

Gas control Gas control open/ignition

Flame detection Appliance operational

IMD-0511 R1

The control panel is completely menu-driven, and comprises:

• a 4-line display with 20 characters per line;

• 6 pushbuttons for operating the appliance (below the display);

• 6 graphical symbols (above the display);

• a connector for a service PC;

• an ON/OFF switch.

The pushbuttons are divided into three groups:

• Navigation buttons:

- Buttons for UP , and DOWN ;

-Enter: ;

- Reset button:

• The main menu (11 "Main menu"): ;

• the service program (12 "Service program"): . This chapter is specifically intended for the service and maintenance engineer and installation engineer.

In this manual, the display of the electronic controller is shown as in the figure, both with and without icons.

7.4 Electronic controller ON/OFF switch

The ON/OFF switch of the electronic controller is used to switch the appliance ON and OFF.

INTERNAL CHECK

After switching on, the text appears on the display for about 10 seconds. Themain menu (11 "Main menu") then appears. If no selection is made in the main menu, the appliance automatically switches to the OFF mode (8.2 "Operating modes").

Note

To isolate the appliance electrically, you must use the isolator between the appliance and the mains power supply.

INTERNAL CHECK

7.5 Navigation buttons

The use of these buttons is explained with the help of the figure that shows the main menu (11 "Main

menu").

The navigation buttons are:

• Buttons for UP , and DOWN ;

• Enter: ;

• Reset button: .

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The ^ and È indicate that you can scroll up and/or down. Use the and buttons to scroll.

MENU OFF ^»ON È WEEK PROGRAM

EXTRA PERIOD SETTINGS

The cursor » points to the option to be activated. In the display as shown in the figure, you can scroll through the main menu.

The main menu comprises:

WEEK PROGRAM, EXTRA PERIOD SETTINGS EXTRA PERIOD

Press to confirm the selected option.

With the button, you go back one page in a menu and all options selected in the current menu are discarded.

. You have to scroll down further to see the

and

OFF, ON

SETTINGS

The control panel

and

texts.

gis

Note

The button is also used to reset the

appliance after a fault.

7.6 PC connection

The PC connection is solely intended to enable technicians from A.O. Smith to display the status and history of the appliance. These details can be important for troubleshooting and/or responding to complaints.

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8 Status of the

appliance

8.1 Introduction

Topics covered in this chapter, in sequence:

• Operating modes

• Error conditions

• Service condition

• Warning

8.2 Operating modes

When running, the appliance has four basic operating modes, namely:

•

OFF

•

PROG

•

EXTRA

8.2.1

In this mode, the frost protection is activated. The figure shows the display with the following information:

• line one: the text

• line two: the time, the day and T

• lines three and four: the text

OFF 13:45 Thursday 6ÉC FROST PROTECTION ACTIVATED

8.2.2

In this mode, the appliance continually responds to the hot water demand. The figure shows the display with the following information:

• line one: the text ON;

• line two: the time, the day and T1 and T3

• line three: the programmed water temperature

• line four: is empty when the appliance is idle, or

ON 13:45 Thursday 67ÉC

OFF

FROST PROTECTION ACTIVATED

alternately (2.3 "The appliance's heating cycle").

;

set

depending on the heating cycle (2.3 "The

appliance's heating cycle"), displays a text such as

HEAT DEMAND

Tset 75ÉC

8.2.3

In this mode a preset week program is active, and the appliance responds continually to demand within the time periods set in the week program. There are two distinct situations possible in this mode:

PROG 10:00 Monday 76ÉC MO 11:15 Tset 75ÉC

1. The current time falls within a set time period

PROG 12:00 Monday 76ÉC MO 11:15 PERIOD ACTIVATED

2. The current time falls outside a set time period

PROG

of the week program.

The figure shows the display with the following

information:

PROG

;

Ts et

and T3

of the active

- line one: the text

- line two: the time, the day and T alternately (2.3 "The appliance's heating

cycle");

- line three: the next scheduled switch-off time and the water temperature period;

- line four: is empty when the appliance is idle, or depending on the heating cycle (2.3 "The

appliance's heating cycle"), displays a text

such as

of the week program.

The figure shows the display with the following information:

- line one: the text

- line two: the time, the day alternately (2.3 "The appliance's heating

cycle");

- line three: the next scheduled switch-on time;

- line four: displays the text

PERIOD ACTIVATED

HEAT DEMAND

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In all modes, the temperature may at any moment drop below the desired temperature. The appliance then enters a heating cycle. This heating cycle is identical (2.3 "The appliance's heating cycle") for all basic operating modes.

Note

Setting and programming the basic operating modes is described in the chapter on the Main menu (11 "Main menu").

8.2.4

In this mode, a single extra period is programmed and activated. In this mode, the temporarily overruled to meet a single period of heat demand. When the period has passed, the appliance automatically returns to the previous operating mode. The figure shows the display with the following information:

• line one: the text

• line two: the time, the day and T

• line three: the switch-on or switch-off time and the

• line four: the text

EXTRA 12:30 Thursday 76ÉC TH 12:45 Tset 75ÉC PERIOD ACTIVATED

EXTRA

PROG

and ON modes are

EXTRA

;

and T3

alternately (2.3 "The appliance's heating cycle");

related water temperature setting;

PERIOD ACTIVATED

8.3 Error conditions

The figure shows an example of an error condition. If the appliance enters this condition, the display will show the following information:

• line one: error code comprising a letter and two

digits, followed by the error description;

• lines two to four: alternately, a brief explanation of

the error, and a brief action to resolve the error.

S04: SENSOR ERROR

CHECK

SENSOR OR DUMMY

The display does not show what type of error has been detected. A comprehensive overview of the errors is provided elsewhere in the manual (13 "Troubleshooting").

If, as end-user, you find the appliance in an error condition, you may attempt to restart the appliance by pressing the button once.

However, if the error returns or occurs several times in a short time, you must contact your service and maintenance engineer.

8.4 Service condition

The figure shows the message

!!! WARNING !!!

MAX. BURNINGHOURS:

SERVICE REQUIRED

appear, then the appliance is in need of a service and maintenance inspection. In that case, contact your service and maintenance engineer.

Note

The message the number of expired burning hours and the preset service interval. Should the service interval have been incorrectly selected, contact the service and maintenance engineer for instructions on how to adjust this. Information on the maintenance frequency is provided elsewhere in the manual (14 "Maintenance frequency").

. Should this message

SERVICE REQUIRED

is based on

8.5 Warning

The figure shows the message:

!!! WARNING !!!

SHORT CYCLE

PREVENTION

The appliance will continue to run under partial load. Explanations of the warnings are provided elsewhere in the manual (13 "Troubleshooting").

Caution

The displayed action to resolve the error may only

be performed by a service and maintenance engineer.

There are various types of errors:

• LOCK OUT ERRORS

When the cause has been removed, these errors require a reset with the button before the appliance can resume operation.

• BLOCKING ERRORS

These errors disappear automatically once the cause of the error has been removed, after which the appliance resumes operation by itself.

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9 Starting and running

9.1 Introduction

Topics covered in this chapter, in sequence:

• Starting and running.

• The appliance's heating cycle.

9.2 Starting and running

Start the appliance as follows:

1. Fill the appliance (5 "Filling").

2. Open (3.5 "Installation diagram") the manual gas valve.

3. Switch on the power to the appliance using the isolator between the appliance and the power supply.

4. Switch the electronic controller ON by setting the ON/OFF switch to position I.

»START OPERATION ^ CHANGE SETPOINT È Tset=65ÉC

6. Confirm the

The appliance is now in "ON mode". If there is a heat demand, the appliance will run through the heating cycle (2.3 "The appliance's heating

cycle").

If the heating cycle is not run, there is no heat demand; if this is the case, Tset will probably need to be set (11.4 "Setting the water temperature").

START OPERATION

by pressing

GENE SI S

IMD-0511 R1

The display will now show about 10 seconds and go to the main menu.

INTERNAL CHECK

MENU »OFF ^ ON È WEEK PROGRAM

for

9.3 The appliance's heating cycle

The appliance's heating cycle is activated when the measured water temperature (T3) falls below the threshold value (T the currently selected appliance operating mode. If the appliance is in the "OFF mode" (frost protection), for example, this value is 5°C. If the appliance is in the "ON mode", this set point can be selected, for example, 65°C.

The heating cycle runs successively through the following states:

1. HEAT DEMAND;

2. PRE-PURGE;

3. PRESSURE SWITCH;

4. PRE-GLOW;

5. IGNITION;

6. RUNNING 1;

7. RUNNING 2;

8. POST-PURGE.

The complete cycle is explained in the following example, which assumes the appliance is in the basic

mode

operating modes.

Note

The same heating cycle applies to the other

). This set point value depends on

set

5. Press the blue arrow once ( ) to position the cursor in front of ON and press . The display shown in the figure will appear.

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Once the appliance starts, it will run through the following steps:

1. The water temperature drops below the set

temperature of (for example) controller detects a demand and starts the heating cycle.

- The icon is activated.

- The message

HEAT DEMAND

°C. The electronic

appears.

ON Ê 13:45 Thursday 63ÉC

Tset 65ÉC

HEAT DEMAND

2. Following heat demand, the fan is powered up and the pre-purge begins. This lasts about 15 seconds. During this phase, any residual gases are removed.

- The icon is activated.

- The message

PRE PURGE

appears.

ON Ê Ê 13:45 Thursday 63ÉC

Tset 65ÉC

PRE PURGE

3. During the pre-purge, the pressure switch closes.

- The icon is activated.

- The message

appears.

PRESSURE SWITCH

ON Ê Ê Ê 13:45 Thursday 63ÉC

Tset 65ÉC

PRESSURE SWITCH

4. After a little time, the pre-purge ceases and the electronic controller reduces the speed of the fan to the rotational speed for ignition. This is followed by the (pre-)glow of the hot surface igniter.

- The and icons are removed.

- The icon is activated.

ON Ê Ê 13:45 Thursday 63ÉC

Tset 65ÉC

GLOW PLUG

5. After a number of seconds pre-glow, the partial load gas control is opened and ignition takes place.

- The icon is activated.

- The

IGNITION

message appears.

ON Ê Ê Ê 13:45 Thursday 63ÉC

Tset 65ÉC

IGNITION

6. After ignition, the flame is detected and the appliance will be running. This means that actual heating has started. The rotational speed of the fan then increases to the normal running speed for the partial load phase, and the pressure switch closes:

- The icon is removed.

- The and icons are activated.

- The

RUNNING 1

message appears.

ON ÊÊÊ Ê 13:45 Thursday 63ÉC

Tset 65ÉC

RUNNING 1

7. If the temperature difference between T is greater than the downward hysteresis plus the stage difference, then second gas control (full loaf gas control) is opened and the other burners ignite.

8. After ignition of the full load phase, the flame on these burners is not detected separately; the appliance is however operational. The rotational speed of the fan then increases to the normal running speed for the fully loaded phase:

- The

RUNNING 2

message appears.

and T3

set

ON ÊÊÊ Ê 13:45 Thursday 63ÉC

Tset 65ÉC

RUNNING 2

9. When the water is almost up to temperature (T minus stage difference), the gas control for the full load phase closes and the fan's rate drops to the revs for the partially loaded phase.

- The , , and icons remain activated.

- The

RUNNING 1

message appears.

set

56 Instruction manual GWV

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10. When the water is up to temperature, the heat demand drops off and the post-purge starts. This lasts about 25 seconds.

- The , and icons are removed.

- The icon is activated.

- The message

ON Ê Ê 13:45 Thursday 65ÉC

POST PURGE

11. Following the post-purge, the fan stops and the pressure switch opens:

- The and icons are removed.

-The

POST PURGE

ON 14:05 Thursday 65ÉC

POST PURGE

Tset 65ÉC

message is removed.

appears.

With any subsequent heat demand, the heating cycle will resume from step 1.

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10 Shutting down

10.1 Introduction

This chapter describes:

• Shutting the installation down for a brief period

("OFF mode");

• Isolating the appliance from the mains;

• Shutting the appliance and storage tank down for

a long period.

10.2 Shutting the installation down for a

brief period ("OFF mode")

To shut the installation down for a brief period, you must activate the frost protection.

You can use the frost protection to prevent water freezing in the appliance.

Activate the frost protection as follows:

1. Press the button to select the main menu.

2. Use and to position the cursor in front of

Confirm with .

OFF 13:45 Thursday 6ÉC FROST PROTECTION ACTIVATED

The frost protection cuts in if the water temperature

FROST

drops below 5°C. The text line one of the display. The appliance heats the water to 20°C (T

Note

These values of 5°C and 20°C cannot be adjusted.

) and drops back to the

set

will then appear on

OFF

mode.

OFF

10.3 Isolating the appliance from the mains

The appliance should only be isolated from mains power in the correct way. The correct procedure is as follows:

1. Activate the

2. Position the cursor in front of

3. Confirm

OFF

with .

OFF

4. Wait until the fan has stopped. The icon then goes out.

5. Switch the appliance OFF (position 0) using the ON/OFF switch on the control panel.

GENE SI S

IMD-0511 R1

6. Isolate the appliance from the power supply by

setting the isolator between the appliance and the mains power supply to position 0.

10.4 Shutting the appliance and storage

tank down for a long period

Drain the appliance and storage tank if you are shutting the installation down for a longer period of time. Proceed as follows:

1. Isolate the appliance from the power supply (10.3 "Isolating the appliance from the

mains").

2. Shut off the gas supply.

3. Close the stop valve in the hot water pipe.

4. Close the supply valve of the protected cold supply setup.

5. Open the drain valve

6. Open the air valves to the appliance and storage tank so that the water can run out of them completely.

MENU »OFF ^ ON È WEEK PROGRAM

Caution Failure to wait until the fan stops purging can

cause damage to the appliance.

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11 Main menu

11.1 Introduction

The

is reached by pressing the button of the

electronic controller.

»OFF ^ ON È WEEK PROGRAM

EXTRA PERIOD SETTINGS

The main menu comprises:

•

OFF

Select this option if you wish to shut the appliance down (10 "Shutting down") for a brief period, but do not wish to drain it. In this mode, the frost protection is active. This prevents water from freezing in the appliance.

• In this mode, the appliance continually responds to the hot water demand (11.3 "Switching on the "ON

mode"").

WEEK PROGRAM

• Select this option to allow the appliance to respond to demand only during pre-programmed periods (11.5 "Week program"). Outside those periods, only frost protection is active.

•

EXTRA PERIOD

Use this option to overrule the positions (=weekly program) to meet the demand for hot water for a temporary period (11.10 "Extra

period").

SETTINGS

• Select this option to set (11.12 "Settings") the language and the time. You can also use this option to display the control range (temperature), and the ignition and running speeds of the fan.

Note

If you fail to make any selection with the main

menu open, then after 30 seconds, the appliance will automatically return to the mode it was previously in.

OFF, ON

PROG

Confirm with .

This means:

1. : Activate the main menu with .

SETTINGS

SETTINGS LANGUAGE

LANGUAGE

4. Confirm with . After entering , you will have activated the

: Use the and/or buttons to go to and confirm with .

: Use the and/or buttons to go to

LANGUAGE

submenu.

11.3 Switching on the "ON mode"

You can switch the appliance to the ON mode from any operational mode, as follows:

1. :

Confirm with .

Note

First consult the chapter about switching

on (9 "Starting and running") too.

START OPERATION

11.4 Setting the water temperature

11.4.1 Setting the water temperature via

the SET POINT menu

The water temperature can be adjusted between 40°C and 85°C.

Set the water temperature via:

1. :

Confirm with .

START OPERATION ^»CHANGE SETPOINT È Tset=65ÉC

2. Use:

• to increase the value;

• to decrease the value.

CHANGE SETPOINT

11.2 Notational convention for menu-related instructions

The

( ) of the electronic controller is divided into submenus. For example, functions reached from the main menu. The

SETTINGS

For example,

SETTINGS LANGUAGE

notational convention:

• :

menu is divided into submenus in turn.

LANGUAGE

. So, for example, to select the menu, this manual uses the following

SETTINGS

is a submenu of

LANGUAGE

is one of the

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• Confirm with .After confirming, the appliance enters "ON mode".

SET POINT

» 65ÉC

Note

If the temperature setting is higher than the current water temperature, it is possible that the appliance will not immediately start heating. To prevent excessively frequent switching on and off, there is a heating margin. The standard margin setting is 4°C. The appliance starts heating up if the water temperature is 4°C below the SETPOINT. We refer to this margin as the hysteresis. The service and maintenance engineer can set (12.2 "Setting the

hysteresis") the hysteresis value.

11.4.2 Setting water temperature during

ON mode

The water temperature can also be directly adjusted when the appliance is in the "ON mode". Simply use:

• to increase the value;

• to decrease the value.

• Confirm with .

ON 13:45 Thursday 65ÉC

Tset»65ÉC

• Starting and stopping the week program

• Changing the appliance's standard week program

• Adding times to a week program

• Deleting times from a week program

11.6 Starting and stopping the week program

The week program can be started up from any other operating mode, as follows:

1. :

A week program can be shut down simply by activating a different operating mode, for example the "ON mode".

WEEK PROGRAM

Confirm with .

START OPERATION

11.7 Changing the appliance's standard week program

Note

First enter the desired week program on the

program card supplied.

A week program is made up of a number of programmable periods in which you can have the appliance switch on and off. A period consists of:

• switch-on time: day of the week, hours and

minutes:

• switch-off time: hours and minutes;

• the water temperature setting;

• on/off setting for a program-controlled pump.

11.5 Week program

Using the week program, you can set the water temperature for the days and times you want.

If the appliance is running under a week program, this is indicated on the display by the line (see the figure). The second line shows the time of day, the day of the week and the temperature. The third line shows the next switching time of the week program and the programmed temperature. The fourth line shows the

PROG 07:55 Monday 64ÉC MO 08:00 Tset 75ÉC PROGRAM ACTIVATED

The appliance's default week program switches the appliance on every day at 00:00 and off at 23:59. The default water temperature setting is 65°C.

If you want, you can change every setting in the appliance's standard week program.

If the water temperature becomes too low while the week program is running, the appliance will run through the heating cycle (2.3 "The appliance's

heating cycle") and return to the week program.

This following are discussed:

PROGRAM ACTIVATED

PROG

text on the first

text.

Note

The switch-on and switch-off times may only be on the same day of the week. A maximum of three periods may be programmed per day. You can program a maximum of 21 periods.

Call the menu for the week program up as follows:

• :

WEEK PROGRAM

Confirm with .

WEEK PROGRAM

START OPERATION ^»PROGRAM OVERVIEW È

PROGRAM OVERVIEW

62 Instruction manual GWV

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The display shows the menu for the week program (see figure below). With the default setting, the program switches on and off every day at 00:00 and 23:59 respectively, the water temperature is 65ºC and

the pump is switched on (

DAY TIME Tset ON »SU 00:00 65ÉC P OFF SU 23:59 ON MO 00:00 65ÉC P

OFF MO 23:59 ON TU 00:00 65ÉC P OFF TU 23:59 ON WE 00:00 65ÉC P OFF WE 23:59 ON TH 00:00 65ÉC P OFF TH 23:59 ON FR 00:00 65ÉC P OFF FR 23:59 ON SA 00:00 65ÉC P OFF SA 23:59

INSERT DELETE START OPERATION

Example

As an example, we will set the switch-on time for Sunday to 08:15 and the corresponding switch-off time to 12:45. The water temperature will be set to 75ºC and the pump will run continuously. The following settings are entered one by one using the menus: the switch-on time, the switch-off time, the desired water temperature and the mode of the program-controlled pump.

The cursor moves to the minute digits, which flash.

ON SU 08»15 OFF SU 08:15 Tset 65ÉC PUMP ON SAVE

Note

Because the switch-off time can never be earlier than the switch-on time, the switch-off time setting is automatically adjusted with the switch-on time.

4. Use and to set the minutes. In the example,

this is 15.

Confirm with .

The cursor moves to the switch-off hour digits,

which flash.

ON SU 08:15 OFF SU»08:15 Tset 65ÉC PUMP ON SAVE

11.7.2 Week program: setting switch-off

time

1. Use and to set the hour. In the example, this

Confirm with .

The cursor moves to the minute digits, which flash.

ON SU 08:15 OFF SU 12»15 Tset 65ÉC PUMP ON SAVE

11.7.1 Week program: setting the switchon time

1. Position the cursor at SU

Confirm with .

ON »SU 08:00 OFF SU 08:00 Tset 65ÉC PUMP ON SAVE

The day indicated by the

2. Use and to set the desired day. In the

example, this is

Confirm with .

ON SU»08:00 OFF SU 08:00 Tset 65ÉC PUMP ON SAVE

The cursor moves to the hour digits, which flash.

3. Use and to set the hour. In the example, this

Confirm with .

will blink.

(Sunday).

2. Use and to set the minutes. In the example,

this is

Confirm with .

The cursor moves to the desired water temperature.

ON SU 08:15 OFF SU 12:45 Tset»65ÉC PUMP ON SAVE

11.7.3 Week program: setting the water temperature

1. Use and to set the water temperature. In the

example this is 75°C.

Confirm with .

The cursor moves to

ON SU 08:15 OFF SU 12:45 Tset 75ÉC PUMP»ON SAVE

PUMP ON

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11.7.4 Week program: setting the programcontrolled pump

1. If required, a pump can be controlled during the

period. Use and to set ensures a regular circulation of hot water in the hot water pipes. You can skip this step if you there is no pump in your hot water circuit.

Confirm with .

The cursor moves to

ON SU 08:15 OFF SU 12:45 Tset 75ÉC PUMP ON »SAVE

2. Confirm with .

The display shown in the figure will appear.

DAY TIME Tset ON »SU 08:15 75ÉC P OFF SU 12:45 ON MO 00:00 65ÉC P

OFF MO 23:59 ON TU 00:00 65ÉC P OFF TU 23:59

3. If you wish, you can use to scroll to another day, and change more switch-on (11.7.1 "Week

program: setting the switch-on time") and switch-

off times (11.7.2 "Week program: setting switch-off

time").

4. After changing all desired switch-on and switch off times, you can start running the week program:

Use to scroll to Confirm with .

START OPERATION

PUMP ON

SAVE

The pump

11.8 Adding times to a week program

The menu for to a week program is reached via:

1. :

Confirm with .

WEEK PROGRAM

START OPERATION

^»PROGRAM OVERVIEW È

INSERT

WEEK PROGRAM

switch-on and switch-off times

PROGRAM OVERVIEW

The display shows the menu for the week program. The cursor points to the active period.

DAY TIME Tset ON »SU 08:15 75ÉC P OFF SU 12:45 ON MO 00:00 65ÉC P

....................

OFF SA 23:59

INSERT DELETE START OPERATION

2. Scroll to

Confirm with .

The submenu for adding a period will appear.

ON »SU 08:15 OFFSU12:45 Tset 65ÉC PUMP ON SAVE

Example

Asan example, we will program an extra period in which the switch-on time is set to 18:00, and the switch-off time to 22:00. The water temperature will be set to 75ºC and the pump will run continuously.

DAY TIME Tset ON »SU 18:00 75ÉC P OFF SU 22:00 ON MO 00:00 65ÉC P

OFF MO 23:59

....................

OFF SA 23:59

INSERT DELETE START OPERATION

3. Do the following:

a. Set the switch-on time (11.7.1 "Week program:

setting the switch-on time").

b. Set the switch-off time (11.7.2 "Week program:

setting switch-off time").

c. Set the water temperature (11.7.3 "Week

program: setting the water temperature").

d. Set the program-controlled

pump (11.7.4 "Week program: setting the

program-controlled pump").

5. To activate the week program with the new period added, scroll to confirm with .

INSERT

START OPERATION

and

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11.9 Deleting times from a week program

All switch-on/off times are shown sequentially in the display. Assume that the switch-on/off times for the appliance are programmed as in the figure.

DAY TIME Tset ON »SU 08:15 75ÉC P OFF SU 12:45 ON SU 18:00 75ÉC P

OFF SU 22:00

....................

OFF SA 23:59

INSERT DELETE START OPERATION

To delete a period, proceed as follows:

WEEK PROGRAM

START OPERATION ^»PROGRAM OVERVIEW È

The display shows the menu for the week program.

1. Scroll to

Confirm with .

To warn you that you are now working in the "delete" submenu, the cursor is replaced with an exclamation mark (!) and the period settings flash.

DAY TIME Tset ON !SU 08:15 75ÉC P OFF SU 12:45 ON SU 18:00 75ÉC P

OFF SU 22:00

....................

OFF SA 23:59

INSERT DELETE START OPERATION

2. Scroll with to the day to be deleted. For example, the second period on the figure.

Confirm with .

DAY TIME Tset ON !SU 18:00 75ÉC P OFF SU 22:00 ON MO 00:00 65ÉC P

OFF MO 23:59

....................

OFF SA 23:59

INSERT DELETE START OPERATION

DELETE

(Sunday). See

3. The lines showing switch-on/off times are replaced

DELETE BLOCK?

Confirm with (or use to cancel)

DAY TIME Tset ON DELETE OFF BLOCK? ON MO 00:00 65ÉC P

The switching period has been deleted. You will return now to the week program menu. The cursor points to the first programmed period.

DAY TIME Tset ON SU 08:15 75ÉC P OFF SU 12:45 ON MO 00:00 65ÉC P

OFF MO 23:59

....................

OFF SA 23:59

INSERT DELETE START OPERATION

4. Use to scroll to

Confirm with .

The week program is active.

. See the figure.

START OPERATION

11.10 Extra period

Use an extra period when you either want to have the appliance switch on and off for a certain period, either without modifying the active week program, or without taking the appliance out of the ON or OFF mode (frost protection active).

If the appliance is running an "extra period", this is

EXTRA

indicated in the display with

EXTRA 10:00 Monday 76ÉC MO 11:15 Tset 75ÉC PERIOD ACTIVATED

If the water temperature becomes too low during the extra period, the appliance will run through the heating cycle (2.3 "The appliance's heating cycle") and fall back into the extra period.

The same settings can be made for an extra period as for a week program (11.7 "Changing the appliance's

standard week program") period.

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11.11 Programming an extra period

1. Call up the menu for entering an extra period via:

2. :

^ WEEK PROGRAM È»EXTRA PERIOD

EXTRA PERIOD

Confirm with .

The display show the settings for the extra period.

11.11.1 Setting the switch-on time

1. Use and to set the day. In the example, this is

Confirm with .

The cursor moves to the hour digits, which flash.

ON SU»08:00 OFF SU 08:00 Tset 65ÉC PUMP ON START

2. Use and to set the switch-on hour to the desired value. In the example, this is

Confirm with .

The cursor moves to the minute digits, which flash.

ON SU 08:15 OFF SU 12»15 Tset 65ÉC PUMP ON START

2. Use and to set the minutes. In the example,

this is

Confirm with .

The cursor moves to the water temperature. See the figure.

ON SU 08:15 OFF SU 12:45 Tset»65ÉC PUMP ON START

11.11.3 Setting the water temperature

1. Use and to set the water temperature. In the example this is 75°C.

Confirm with .

The cursor moves to

ON SU 08:15 OFF SU 12:45 Tset 75ÉC PUMP»ON START

PUMP ON

ON SU 08»15 OFF SU 08:15 Tset 65ÉC PUMP ON START

Note

Because the switch-off time can never be earlier than the switch-on time, the switch-off time setting is automatically adjusted with the switch-on time.

3. Use and to set the minutes. In the example,

this is

Confirm with .

The cursor moves to the hour digits of the switchoff period.

ON SU 08:15 OFF SU»08:15 Tset 65ÉC PUMP ON START

11.11.2 Setting the switch-off time

1. Use and to set the hour. In the example, this

Confirm with .

11.11.4 Setting the program-controlled pump

1. If required, a pump can be controlled during the

period. Use and to set ensures a regular circulation of hot water in the hot water pipes. You can skip this step if you there is no pump in your hot water circuit.

Confirm with .

The cursor moves to

ON SU 08:15 OFF SU 12:45 Tset 75ÉC PUMP ON »START

2. Confirm with .

The extra period has been programmed.

Note

When the extra period is finished, the controller returns to the ON, OFF or The following week, the extra period will NOT be switched on automatically.

PUMP ON

START

WEEK PROGRAM

The pump

mode.

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11.12 Settings

Using the settings and read certain appliance data:

• Adjustable settings

• Displayable appliance specifications, this

SETTINGS

- Language of the menu.

- Current day of week and time.

category is only relevant to the installation engineer and/or service and maintenance engineer

- Control range (water temperature).

- Ignition speed of fan.

- Working speed of fan.

option, you can adjust certain

11.12.1 Setting menu language

To set menu language:

WEEK PROGRAM ^ EXTRA PERIOD È»SETTINGS

1. Call up the menu for selecting the language as follows:

2. :

SETTINGS »LANGUAGE ^ DAY/TIME È SPECIFICATIONS

3. The cursor is positioned in front of

LANGUAGE

^ NEDERLANDS È»DEUTSCH

4. Scroll to the desired language with .

The language is set.

SETTINGS

Confirm with .

The display shows the menu for settings.

Confirm with .

The display shows the language selection menu.

ENGLISH

FRANCAIS ITALIANO CZECH

Confirm with .

LANGUAGE

11.12.2 Setting day and time

To enter the time and day:

WEEK PROGRAM ^ EXTRA PERIOD È»SETTINGS

1. Call up the menu for entering the day and time as follows:

2. :

3. Scroll to

SETTINGS

^»DAY/TIME È SPECIFICATIONS

DAY

4. The cursor is positioned in front of

TIME »00:00

5. The cursor moves to the hour digits, which flash.

TIME 15»00

SETTINGS

Confirm with .

The display shows the menu for settings.

DAY/TIME

Confirm with .

LANGUAGE

The display shows the submenu for adjusting the day.

»Sunday

Scroll to the desired day using and .

Confirm with .

The day has been set. The display shows the submenu for adjusting the time.

Scroll w to the current hour, for example 15, using

and .

Confirm with .

using and

Monday Tuesday

Wednesday Thursday Friday Saturday

Sunday

6. The cursor moves to the minute digits, which flash.

Scroll to the minute to come, for example 45, using

and .

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Confirm the minute setting with

TIME 15»45

The time has been set.

Note

The appliance takes no account of summer time.

11.12.3 Displaying appliance specifications

Note

This category is only relevant to the installation

engineer and/or service and maintenance engineer.

The table shows the correct settings.

GWV 120

Ignition rotation speed (rpm)

Working revs 1 (partial load) (rpm)

Working revs 2 (full load) (rpm)

Adjustability

(

1620

2040

2340

40 - 85

Confirm with .

SETTINGS

LANGUAGE ^ DAY/TIME È»SPECIFICATIONS

The display shows the submenu for displaying

appliance specifications.

SPECIFICATIONS

REGULATION INTERVAL

IGNITION SPEED

WORKING SPEED

3. Scroll with to the section to be displayed, for example

The relevant display appears.

REGULATION INTERVAL

85ÉC

GWV 150 GWV 200

Ignition rotation speed (rpm)

Working revs 1 (partial load) (rpm)

Working revs 2 (full load) (rpm)

Adjustability

(

Bring up the menu to display the appliance specifications via:

1. :

^ EXTRA PERIOD È»SETTINGS

2. Scroll to

SETTINGS

Confirm with .

WEEK PROGRAM

SPECIFICATIONS

1500 1800

2340 2460

2700 2820

40 - 85 40 - 85

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12 Service program

12.1 Introduction

The service program is used by the installation engineer or service and maintenance engineer for:

• Setting the hysteresis;

• Displaying the error history;

• Displaying the appliance history;

• Displaying the appliance selection;

• Switching the pump on or off;

• Setting the service interval;

• Setting the display contrast;

• Setting the display backlight switching period;

• Setting the display scroll speed;

• Setting the stage difference for the appliance;

• Setting the pump running-on time.

SERVICE MENU »HYSTERESIS ^ HISTORY OF ERRORS È APPLIANCE HISTORY

SELECT APPLIANCE PUMP RELAY SERVICE INTERVAL DISPLAY CONTRAST BACKLIGHT TIME

SCROLL SPEED STAGE DIFFERENCE PUMP POST PURGE

These submenus are briefly described in the following paragraphs. If you are not familiar in general with how to use the displays and menus, first read the relevant (7 "The control panel") chapter.

Note

The notation convention for the service menu is identical to that of the main menu (11.2 "Notational

convention for menu-related instructions"). The

difference is that you use to call up the service program, instead of , which calls up the main menu.

12.2 Setting the hysteresis

If the preset temperature (SET POINT) is higher than the current water temperature, the appliance might not immediately start the heating cycle (2.3 "The

appliance's heating cycle"). This is caused by the built-

in safety margin. To prevent excessively frequent switching on and off, there is a heating margin. This margin is called the hysteresis. The hysteresis can be set DOWN (negative hysteresis). The hysteresis can be adjusted between 2°C and 7°C.

Set the hysteresis DOWN as follows:

•:

HYSTERESIS DOWN »4ÉC

HYSTERESIS DOWN

The figure shows an example.

12.3 Displaying the error history

Display the error history as follows:

•:

The controller will display an overview of "Blocking errors" and "Lock out errors". In both cases, the electronic controller reserves 15 lines for the last 15 error messages. If there are fewer than 15 error messages, three points (...) are displayed. The display first shows the "Blocking errors". When is pressed, the "Lock out errors" are displayed.

The figure shows an example of "Blocking errors". The

HISTORY OF ERRORS

HISTORY OF ERRORS(B)

È CO2 50 HZ ERROR

The figure shows an example of "Lock out errors". The

HISTORY OF ERRORS

HISTORY OF ERRORS(L)

È ...

causes, please refer to the relevant chapter (13 "Troubleshooting").

HISTORY OF ERRORS

text is followed by

S04 SENSOR ERROR F06 IONISATION

text is now followed by

F02 FAN F07 FLAME ERROR

Note

For an overview of all errors and the possible

(B)

(L)

12.4 Displaying the appliance history

The appliance history submenu is used to display the burning hours, the number of ignitions, the number of flame errors and the number of ignition errors.

Call up the menu for displaying the appliance history as follows:

•:

APPLIANCE HISTORY

The figure shows an example.

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APPLIANCE HISTORY BURNINGHOURS 000410 ^IGNITIONS 001000 ÈFLAME ERRORS 000021

IGNIT ERROR 000013

Service program

12.5 Displaying the appliance selection

To display the appliance selection, use:

•:

SELECT APPLIANCE »5934 ^ 8576 È 3379

SELECT APPLIANCE

The appliance number can be found on the rating plate.

The appliance selection has been correctly preset in the factory.

6527 2331 3908 2510 7767

12.6 Switching the pump on or off

If a program-controlled pump is installed (3.10.4 "Connecting a program-controlled

pump") then this can be turned ON or OFF via:

•:

PUMP RELAY »ON

PUMP RELAY

The standard setting for the pump is OFF.

OFF

The service interval is based on the number of burning hours. This can be set to 500, 1000 and 1500 hours. The standard setting for number of hours is 500. Once the preset number of hours is reached, a message (8.4 "Service condition"). to this effect will appear. Adjust the service interval via:

•:

SERVICE INTERVAL » 500 ^ 1000 BURNING HOURS È 1500

12.8 Setting the display contrast

Set the display contrast as follows:

•:

DISPLAY CONTRAST

12.9 Setting the display backlight switching

Set the backlight time (the time that the display backlight remains lit after the last button is pressed) as follows:

•:

BACKLIGHT TIME

SERVICE INTERVAL

DISPLAY CONTRAST

The default setting is 100%. The range is 0 to 100%.

The figure shows the related display.

» 90 %

period

BACKLIGHT TIME

The default value is 255 seconds. The range is 0 to 255 seconds.

The figure shows the related display.

» 255 sec

WEEK PROGRAM

If the are active, then the setting for the

EXTRA PERIOD

ON/OFF selection for the pump relay in the service menu.

Example

One of the week program periods is active. During this period, the pump relay setting is OFF. If the pump relay is set ON in the service menu, the pump will nonetheless remain OFF. The pump will only switch ON once the week program period has ended.

12.7 Setting the service interval

To aid servicing, the electronic controller includes a service interval which is used to set the frequency of maintenance interval (14.2 "Determining service

interval") by the service and maintenance engineer,

based on the number of burning hours.

EXTRA PERIOD

WEEK PROGRAM

modes takes priority over the

modes

12.10 Setting the display scroll speed

Adjust the control speed via:

•:

SCROLL SPEED

The default is 10. The range is from 0 through 100. Setting the value too high or low will make scrolling difficult.

» 10

12.11 Setting the stage difference for the appliance

Switching from partial load to full load is handled by the electronic controller, using the stage difference. This value is adjustable.

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The appliance switches from partial load to full load if the temperature difference between the water in the storage tank (T negative hysteresis is greater than this stage difference. Conversely, the apparatus switches from full load to partial load if this temperature difference is smaller than the stage difference.

The stage difference can be adjusted between 2°C and 8°C. The default stage difference is 5°C.

You can set the stage difference using:

) and the set point (T

) minus the

set

•:

STAGE DIFFERENCE

» 5ÉC

STAGE DIFFERENCE

The figure shows an example.

12.12 Setting the pump running-on time

Once the heat demand has been met, the heating cycle stops but the pump continues to run for a short time. The run-on time can be set to 45, 90 or 180 seconds. The default setting is 45 seconds. You can set the run-on time using:

•:

PUMP POST PURGE » 45 sec 90 180

PUMP POST PURGE

The figure shows an example.

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Service program

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13 Troubleshooting

13.1 Introduction

A distinction is made between:

• General errors

General errors are not reported on the display. General errors are:

- Gas smell

- Display does not light up

- Insufficient or no hot water.

- Water leakage

- Explosive ignition.

The manual includes (13.2 "Troubleshooting table for general errors") a table with general errors.

• Displayed errors

Errors are reported on the display as follows:

- One: a code plus a brief description. The code consists of a letter and two digits.

- Two, three and four: a long description, alternating with a recommended action every two seconds. See the figures. The first shows a possible error, the second shows the appropriate checking action.

S02: SENSOR ERROR

HOT WATER OUTLET

SENSOR 1 NOT

CONNECTED

S02: SENSOR ERROR

CHECK OUTLET SENSOR

HEAT EXCHANGER

There are various types of errors, all falling into one of two groups:

- LOCK OUT ERRORS When the cause has been removed, these errors must be reset with the button before the appliance can resume operation.

- BLOCKING ERRORS These errors disappear automatically when the cause of the error is removed, after which the appliance resumes operation by itself.

The manual includes (13.3 "Troubleshooting table for displayed errors") a table of error messages that can appear on the display.

• Displayed warnings

After resolving or removing the cause, the warnings (13.4 "Warnings") can be reset by pressing the button and then .

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13.2 Troubleshooting table for general errors

Warning

Maintenance may only be performed by a qualified service and maintenance engineer.

General errors

Features Cause Measures to take Comment

Gas smell Gas leak

Display is off Appliance is turned off Start the appliance up (9 "Starting and running")

No supply voltage present

Defective fuse(s) Replace fuse(s) To replace the fuses, you must contact your installation engineer.

Water leakage Leakage from a water

connection (threaded)

Leakage from another nearby water appliance or pipe segment

Leak from the storage tank

Warning

Close the main gas valve immediately.

Warning

Do not operate any switches.

Warning

No naked flames.

Warning

Ventilate the boiler room.

1. Check if the isolator is ON.

2. Check that there is power to the isolator.

3. Check whether the ON/OFF switch of the electronic controller is ON (position I).

4. Check whether there is power to the electrical connector block.

5. The measured voltage must be 230 VAC (-15%, +10%).

Tighten the threaded connection If the leak persists, consult your installation engineer

Trace the leak

Consult the supplier and/or manufacturer

Warning

Contact your installation engineer or local gas company

immediately.

See the GWV electrical diagram (17 "Appendices") If the error persists, consult your installation engineer.

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Features Cause Measures to take Comment

Explosive ignition Incorrect supply

pressure and/or burner pressure

Contaminated burner Clean the burner(s) (15.4.2 "Clean the burner(s)")

Contaminated orifice Clean the orifice(s) (15.4.3 "Clean the injector(s)")

Hot water supply insufficient or absent

Appliance is turned off Start the appliance up (9 "Starting and running")

No supply voltage present

Hot water supply is used up

The controller is in OFF mode.

Temperature (T set too low.

set

Set the correct supply pressure and/or burner pressure. (3.11 "Checking the supply pressure and burner

pressure")

1. Check if the isolator is ON.

2. Check that there is power to the isolator.

3. Check whether the ON/OFF switch of the electronic controller is ON (position I).

4. Check whether there is power to the electrical connector block.

5. The measured voltage must be 230 VAC (-15%, +10%).

Reduce hot water consumption and give the appliance time to heat up.

Switch the controller to the ON mode (11.3 "Switching on the "ON

mode"")

) is

Adjust (11.4 "Setting the water temperature") temperature (T a higher value.

set

If ignition is not improved, consult your installation engineer.

See the GWV electrical diagram (17 "Appendices") If the error persists, consult your installation engineer.

If there continues to be insufficient hot water, or none at all, consult your installation engineer.

) to

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13.3 Troubleshooting table for displayed errors

Displayed errors

Code + description Cause Measures to take Comment

S01 (blocking error)

Open circuit for temperature sensor T inlet to heat exchanger

S02 (blocking error)

Open circuit for sensor 1 of temperature sensor T heat exchanger

S03 (blocking error)

Open circuit for sensor 2 of temperature sensor T heat exchanger

S04 (blocking error)

Open circuit in dummy 1

S05 (blocking error)

Open circuit in dummy 2

S06 (blocking error)

Open circuit for temperature sensor T at the bottom of the storage tank.

, outlet of

Sensor is not (correctly) connected

Damaged cable or

defective sensor

Sensor is not (correctly) connected

Damaged cable or defective sensor

Sensor is not (correctly) connected

Damaged cable or defective sensor

Dummy is not (correctly) connected

Defective dummy Replace the dummy sensor

Dummy is not (correctly) connected

Defective dummy Replace the dummy sensor 2

Sensor is not (correctly) connected.

Damaged cable or

defective sensor

Connect the sensor lead to JP3 See the GWV electrical diagram (17 "Appendices")

Replace sensor T

Connect the sensor lead to JP5 See the GWV electrical diagram (17 "Appendices")

Replace sensor T2

Connect the sensor lead to JP5 See the GWV electrical diagram (17 "Appendices")

Replace sensor T2

Connect the dummy sensor (dummy sensor 1 and 2) leads to JP4. See the GWV electrical diagram (17 "Appendices")

Connect the sensor lead to JP5 See the GWV electrical diagram (17 "Appendices")

Replace the sensor To replace the necessary parts, you must contact your installation

(1)

To replace the necessary parts, you must contact your installation engineer

engineer

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Code + description Cause Measures to take Comment

S11 (blocking error)

Short circuit in sensor circuit

Replace sensor T

To replace the necessary parts, you must contact your installation engineer

Short-circuit for temperature sensor T inlet to heat exchanger

S12 (blocking error)

Circuit for sensor 1 of temperature sensor T is shorted.

S13 (blocking error)

Short-circuit for sensor 2 of temperature sensor T heat exchanger

S14 (blocking error)

Short circuit from dummy 1

S15 (blocking error)

Short circuit from dummy 2

S16 (blocking error)

Circuit for temperature sensor T of the storage tank is shorted

, outlet of

at the bottom

Short circuit in sensor circuit

Replace sensor T

Replace the dummy sensor

Replace sensor T

(1)

(2)

To replace the necessary parts, you must contact your installation engineer

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Code + description Cause Measures to take Comment

F01 (blocking error)

Defect in power supply circuit

F02 (lock out error)

Fan fails to run at correct speed.

Live and neutral connected wrong way round

Condensation on the flame probe

Damaged wiring 1. Check the wiring between the fan and the controller.

Dirty or blocked fan 1. Check if the fan is dirty

Because of a drop in the supply voltage, the fan is not running at the correct speed.

Connect live and neutral correctly (3.10 "Electrical connection"); the appliance is phase-sensitive

1. Disconnect the lead at the flame probe

2. Ignite the appliance three times, with an interrupted ionisation circuit

3. Reconnect the ionisation lead to the flame probe

4. Ignite the appliance again

5. The repeated ignition attempts will have caused the condensation to evaporate

2. If any wires are damaged, the wiring harness must be replaced.

3. Reset appliance controller

2. Check that the rotor can rotate freely

3. Reset appliance controller

1. Check the supply voltage, this must be 230 VAC (-15%, +10%).

2. Reset appliance controller

See the GWV electrical diagram (17 "Appendices")

If the error persists, contact your installation engineer

See the GWV electrical diagram (17 "Appendices")

To have the wiring replaced and a new fan fitted, you must contact your installation engineer

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Code + description Cause Measures to take Comment

F03 (lock out error)

The pressure switch fails to work correctly

Damaged wiring/Open circuit

Pressure switch not closing

1. Check the wiring between the pressure switch and the controller

2. If necessary, replace the wiring

1. Check the running speed of the fan (12.5 "Displaying the

appliance selection")

2. Check that the hoses are fitted correctly to the pressure switch and the ventilator's air supply hose. Refit them if necessary

3. Check for cracks in the hoses on the pressure switch and in the air supply hose for the fan. If necessary, replace the hoses.

4. Check that the flue gas outlet is compliant (3.9 "Air supply and

flue").

5. Measure the pressure differential across the pressure switch. See the table (2.4.5 "Pressure switch"). If there is insufficient pressure difference, clean the heat exchanger. If the pressure differential is acceptable, check that the pressure switch is closing, using a multimeter.

If the error cannot be resolved or is persistent, contact your installation engineer To replace the necessary parts, you must contact your installation engineer

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Code + description Cause Measures to take Comment

F04 (lock out error)

Three unsuccessful ignition attempts.

F05 (lock out error)

Too many flame errors have been signalled.

No gas 1. Open the main gas valve and/or the manual gas valve supplying

the water heater

2. Check the supply pressure to the gas control

3. If necessary, repair the gas supply

Air in the gas pipes Bleed the air out of the gas pipe See Checking the supply pressure and burner pressure for how to

No burner pressure 1. Check the burner pressure to the gas control

2. Check that the gas valve(s) open and shut correctly

3. If necessary, replace the gas control.

Defect in the hot surface igniter circuit

Defect in the ionisation circuit

Supply voltage too low Check the supply voltage, this must be 230 VAC (-15%, +10%).

Incorrect roof or wall conduit. Recirculating flue gases.

1. Check that the hot surface igniter is correctly connected (JP2).

2. Check the wiring of the hot surface igniter.

3. Measure the resistance across the hot surface igniter. This must lie between 2 and 5 ohms.

4. Check that the hot surface igniter lights up during ignition.

5. If necessary, replace the hot surface igniter.

1. Check that the flame probe is correctly connected (JP2)

2. Check the wiring of the flame probe

3. Measure the ionisation current. This must be at least 1.5 microamps.

4. Replace the wiring if necessary.

1. Check that the correct roof or wall flue conduit (3.9 "Air supply

and flue") has been fitted.

2. If necessary, install the correct roof or wall conduit.

3. Check that the roof or wall conduit discharges into a permitted area.

To repair the gas supply, contact your installation engineer

bleed air from the gas line, and measure the supply pressure and burner pressure.

To replace the necessary parts, you must contact your installation engineer

If the error persists, contact your installation engineer. To replace the necessary parts, you must contact your installation engineer

If the error cannot be resolved or is persistent, contact your installation engineer

Instruction manual GWV 80

Page 81

Code + description Cause Measures to take Comment

F06 (blocking error)

Short circuit between flame probe and earth

F07 (lock out error)

A flame has been detected after the gas valve was closed.

F08 (lock out error)

Error message from safety relay

F09 (lock out error)

Water temperature safety.

Damaged cable in contact with metal surface.

Ceramic part of the flame probe is broken/cracked.

Defective gas valves 1. Check whether there is still burner pressure present after the

Flame detection before the gas valve opened.

Temperature T T

is greater than 99oC.

, T2 or

Check the wiring of the flame probe. Replace the wiring if necessary..

1. Check that the ceramic part of the flame probe is still intact in the vicinity of the burner's air distribution plate.

2. If not, the flame probe must be replaced.

gas valves have closed.

2. Check whether a flame is still present after the gas valves have closed.

3. If this is the case, the gas control must be replaced.

1. Reset electronic controller.

2. If the error appears again, replace the electronic controller.

3. If this is the case, the gas control must be replaced.

1. Check that the system pump is functioning.

2. Check the position of the temperature sensor T

3. Reset appliance controller

., T2 and T3.

If the error persists, contact your installation engineer. To replace the necessary parts, you must contact your installation engineer.

If the error cannot be resolved or is persistent, contact your installation engineer

To replace the necessary parts, you must contact your installation engineer

If the error cannot be resolved or is persistent, contact your installation engineer

To replace the necessary parts, you must contact your installation engineer

Error F09 remains active in the event that the water temperature during a reset was higher than 90 water off by opening the nearest hot water tap, so that cold water can flow in. If the error cannot be resolved or is persistent, contact your installation engineer

C. If this is the case, first draw

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Code + description Cause Measures to take Comment

F10 (lock out error)

Restriction on the number of ignition attempts based on pressure switch state changes.

F11 (blocking error)

Flame detection with closed gas valve.

F16 (lock out error)

Flow switch does not close

Pressure switch not closing

Defective gas valves See F07.

Component is not (correctly) connected

Component is not (correctly) connected to the controller

Blocked vane switch Disassemble the flow switch from the T-piece and remove any lime

1. Check the running speed of the fan

2. Check that the hoses are fitted correctly to the pressure switch and the ventilator's air supply hose. Refit them if necessary

3. Check for cracks in the hoses on the pressure switch and in the air supply hose for the fan. If necessary, replace the hoses.

4. Check that the flue gas outlet is satisfactory.

Remove the protective cap from the flow switch and connect the wires to terminals COMM and N.O.

Connect the component's controller to connector JP!2. See the GWV electrical diagram (17 "Appendices")

accretions or baked-on dirt from the van switch.

If the error cannot be resolved or is persistent, contact your installation engineer

To replace the necessary parts, you must contact your installation engineer

If the error cannot be resolved or is persistent, contact your installation engineer

For repairing and cleaning the component, contact your installation engineer.

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Code + description Cause Measures to take Comment

C02 (lock out error)

Error message from the appliance controller.

Internal error message from the appliance controller.

C04 (blocking error)

Appliance selection error

Incorrect reference voltage from the AD converter.

• EEPROM read error

• 50 Hz error

• Internal communication error

• Gas valve relay error

• Safety relay error

• Ignition relay error

• RAM error

• EEPROM error

• EEPROM contents do not match the software version

• Processor software error

Incorrect appliance selection / Incorrect selection resistor

1. Reset electronic controller.

2. Check that the frequency of the power supply is compliant (3.4.2 "General and electrical specifications"). If this is not the case, contact your installation engineer

3. If the frequency is correct but the error persists, replace the electronic controller.

1. Check whether the correct appliance is selected (12.5 "Displaying the appliance selection").

2. If the correct appliance is selected, fit the correct selection resistor.

3. If incorrect appliance selected, select the correct one.

To replace the necessary parts, you must contact your installation engineer

If the error cannot be resolved or is persistent, contact your installation engineer To replace the necessary parts, you must contact your installation engineer

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Code + description Cause Measures to take Comment

E03 (lock-out error)

Error in temperature sensor T heat exchanger

E04 (lock-out error)

Error in dummy sensor

E05 (lock out error)

Controller too long in a blocking error

E07 (lock out error)

Temperature difference across the heat exchanger too large

, outlet of

(2)

(1)

The two temperature sensors in the tank detect a differential of >

C over a period of

at least 60 seconds.

The two dummy sensors in the tank detect a differential of >

C over a period of

10 at least 60 seconds.

The controller has been in a blocking error for at least 20 hours.

Defective pump 1. Check that the pump is working correctly To replace the necessary parts, you must contact your installation

Blocked or bunged up pipe system

Wrong pump mode 1. Check the pump operating mode according to the table If the error cannot be resolved or is persistent, contact your

1. Check sensor position and wiring.

2. If necessary, reset the electronic controller. Replace the sensor if the error persists.

1. Check leads from dummy 1 and dummy 2.

2. If necessary, reset the electronic controller. Replace the dummy sensor if the error persists.

1. Resolve the blocking error and press RESET to remove the lock out error.

1. Replace blocked or distorted parts of the pipe system.

2. Clean the pipes to remove any lime accretions or baked-on dirt.

To replace the necessary parts, you must contact your installation engineer

To resolve the blocking error, see fault description for the error concerned.

engineer

For repairing and cleaning the pipe system, contact your installation engineer.

installation engineer

Note:

(1) Temperature sensor T2 is a '2 in 1' sensor; T2 contains 2 NTCs for maximum thermostat and safety thermostat protection. (2) The dummy flue gas sensor consists of dummy flue gas sensor 1 and dummy flue gas sensor 2.

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13.4 Warnings

Warning

Maintenance may only be performed by a qualified service and maintenance engineer.

Features Cause Measures to take Comment

The display shows the text:

!!! WARNING !!!

WORKING SPEED 2

FAN

NOT CORRECT

(see note 1)

The display shows the text:

!!! WARNING !!!

TEMPERATURE DIFFERENCE

HEAT EXCHANGER

TOO LARGE

(see note 1)

The display shows the text:

!!! WARNING !!!

SHORT

HEATING CYCLES

SAFETY

(see note 2)

Fan is running at the wrong speed during full load.

Defective pump Check that the pump is working correctly To replace the necessary parts, you must contact your

Blocked or bunged up pipe system

Wrong pump mode Check the pump mode (3.6.4 "System pump") If the error cannot be resolved or is persistent, contact your

The appliance is oscillating between full load and partial load.

1. Check running speed 2 of the fan (12.5 "Displaying the

appliance selection")

2. Check whether the flue gas discharge is compliant with the table.

3. Check that the flue gas outlet is not blocked; remove any blockage.

1. Replace blocked or distorted parts of the pipe system.

2. Clean the pipes to remove any lime accretions or baked-on dirt.

1. Change the margin between switching in full load and partial load by changing the stage difference via "service program | stage difference"

If the error cannot be resolved or is persistent, contact your installation engineer. To replace the necessary parts, you must contact your installation engineer.

installation engineer.

For repairing and cleaning the pipe system, contact your installation engineer.

installation engineer.

If the error cannot be resolved or is persistent, contact your installation engineer.

Note:

(1) As a result of this warning, the appliance will switch to partial load and remain active in that mode until the warning is cleared with RESET and ENTER

(2) As a result of this warning, the controller will insert a delay of 180 seconds between switching off the stage in question and then starting it up again.

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Troubleshooting

gis

86 Instruction manual GWV

Page 87

14 Maintenance

frequency

14.1 Introduction

14.2 Determining service interval

Note

Regular maintenance extends the service life of the appliance.

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, three months after installation. Based on this check, the best maintenance frequency can be determined.

To aid servicing, the electronic controller has a service interval with which the service and maintenance engineer can determine the frequency of maintenance, based on the number of burning hours.

The service interval can be set to: 500, 1000 or 1500 burning hours. The standard setting is 500 burning hours.

Example

In the first three months, the appliance has burned for 300 hours. During maintenance, it is evident that one service per year will be sufficient. Therefore, after one year, some 1200 burning hours will have elapsed. The first value below 1200 hours that can be selected is 1000 burning hours.

In this case, the service and maintenance engineer sets the interval to 1000.

In the first three months, the appliance has burned for 300 hours. During maintenance, it is evident (perhaps due to the water quality) that service will be required at least once every 6 months.

Therefore, after six months, some 600 burning hours will have elapsed. The first value below 600 hours that can be selected is 500 burning hours.

In this case, the service and maintenance engineer sets the interval to 500.

!!! WARNING !!!

MAX. BURNINGHOURS:

SERVICE REQUIRED

When the set number of burning hours has elapsed, the

SERVICE REQUIRED

message appears, contact should be made with the service and maintenance engineer.

Instruction manual GWV 87

message will appear on the display. Soon after the

Page 88

Maintenance frequency

88 Instruction manual GWV

Page 89

15 Performing

maintenance

15.1 Introduction

15.2 Preparation for maintenance

Caution

Maintenance may only be performed by a qualified service and

maintenance engineer.

At each service, the appliance undergoes maintenance on both the water side and the gas side. The maintenance must be carried out in the following order.

1. Preparation for maintenance

2. Water-side maintenance

3. Gas-side maintenance

4. Finalizing maintenance

Note

To order spare parts, it is important to write down the appliance type and model, and the full serial number of the appliance. These details can be found on the rating plate. Only by ordering with this information can you be sure to receive the correct spare parts.

To test whether all components are still working properly, complete the following steps:

1. Activate the

2. Use and to position the cursor in front of

3. Confirm

MENU »OFF ^ ON È WEEK PROGRAM

OFF

with .

OFF

4. Wait until the fan has stopped. The icon then goes out.

Caution Failure to wait until the fan stops purging can cause damage to the

appliance.

5. Switch the appliance OFF (position 0) using the ON/OFF switch on the

control panel.

GENES I S

IMD-0511 R 1

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Page 90

Performing maintenance

6. Switch the electronic controller ON by setting the On/Off switch to position I.

INTERNAL CHECK

The display will now show go to the main menu.

MENU »OFF ^ ON È WEEK PROGRAM

7. Activate the 'ON mode' by going through the following steps:

- Press the blue arrow once ( ) to position the cursor in front of press .

- Confirm the

8. If there is no heat demand, increase Tset (11.4 "Setting the water

temperature"). Note the original setting. If there is no demand, draw some

hot water off to create demand.

9. Check whether the heating cycle runs correctly (2.3 "The appliance's

heating cycle").

10. If you have adjusted T

water temperature").

11. Carefully remove the sheeting from the front of the appliance.

12. Check the supply and burner pressures (3.11 "Checking the supply

pressure and burner pressure") and adjust these where necessary.

13. Check that all components of the flue gas system are properly attached.

14. Check the pressure differential across the orifice plate of the pressure switch (see the table). If the pressure difference is too low, the flue gas outlet and air supply should be checked for blockages.

START OPERATION

INTERNAL CHECK

by pressing .

, return it to the original value (11.4 "Setting the

set

for about 10 seconds and

and

Pressure switch differential

Appliance Observed pressure differential across the pressure switch

(Pa)

GWV 120 > 66

GWV 150 >

GWV 200 >

15. Test the operation of the overflow valve of the protected cold supply set-up. The water should spurt out.

16. Test the overflow operation of the P-valve. The water should spurt out.

17. Check the drainage pipes from the discharge points of all valves and remove any scale deposits that may be present.

18. Drain (6 "Draining") the appliance.

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15.3 Water-side maintenance

15.3.1 Introduction

15.3.2 Checking the anodes

15.3.3 Descaling and cleaning the storage tank

The following steps must be carried out on the water side:

1. Checking the anodes

2. Descaling and cleaning the storage tank

Timely replacement of the anodes extends the service life of the appliance. The appliance's anodes must be replaced as soon as they are 60% used or more (take this into consideration when determining the maintenance frequency).

1. Loosen the anodes using suitable tools.

2. Check the anodes, and if necessary, replace them.

Scale and lime buildup prevent effective conduction of the heat to the water. Periodic cleaning and descaling prevents buildup of these deposits. This increases the service life of the appliance, and also improves the heating process.

Take the rate of scale formation into account when deciding on maintenance frequency. Scale formation depends on the local water composition, the water consumption and the water temperature setting. A water temperature setting of maximum 60°C is recommended for prevention of excessive scale buildup.

To guarantee a good, watertight seal around the cleaning opening, replace the gasket, washers, bolts and, if necessary, the lid with new parts before reassembly (see the figure). A special set is obtainable from the supplier/manufacturer.

To simplify descaling and cleaning of the tank, the storage tank has a cleaning opening.

IMD-0512 R

1. Remove the cover plate (1) on the outer jacket (see the figure).

2. Undo the bolts.

3. Remove the cover and the gasket.

4. Inspect the storage tank and remove the loose limescale deposits and contamination.

5. If the scale cannot be removed by hand, then the appliance will need to be descaled using a descaling agent. Contact the supplier for advice on the preferred descaling agent.

6. Close the cleaning opening. To avoid damage to the storage tank, tighten the bolts that fasten the lid with a torque no greater than 50 Nm. Use suitable tools for this.

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Page 92

15.4 Gas-side maintenance

15.4.1 Introduction

15.4.2 Clean the burner(s)

15.4.3 Clean the injector(s)

Performing maintenance

The following steps must be carried out on the gas side:

1. Clean the burner(s)

2. Clean the injector(s)

3. Cleaning the aluminium strips

1. Dismantle first the yellow flexible gas hose, the manifold and then the burner(s).

2. Remove all contamination present on the burner(s).

3. Fit the burner(s)

1. Dismantle the injector(s)

2. Remove all contamination present in the injector(s).

3. Fit the injector(s), then the manifold and then the flexible gas hose.

15.4.4 Cleaning the aluminium strips

15.5 Finalizing maintenance

1. Dismantle the flue gas outlet

2. Use a vacuum cleaner to clean the aluminium strips.

To finalize the maintenance carry out the following steps:

1. Fill the appliance (5 "Filling").

2. Start the appliance (9 "Starting and running").

3. Erase the message then once on .

SERVICE REQUIRED

. Do this by pressing once on

92 Instruction manual GWV

Page 93

gis

16 Warranty (certificate)

To register your warranty, you should complete and return the enclosed warranty card after which a warranty certificate will be sent to you. This certificate gives the owner of a appliance supplied by A.O. Smith Water Products Company B.V. of Veldhoven, The Netherlands (hereinafter "A.O. Smith") the right to the warranty set out below, defining the commitments of A.O. Smith to the owner.

16.1 General warranty

16.2 Appliance warranty

16.3 Conditions for Installation and use

If within one year of the original installation date of an appliance supplied by A.O. Smith following verification, and at the sole option of A.O. Smith, a section or part proves to be defective or fails to function correctly due to manufacturing and/or material defects, then A.O. Smith shall repair or replace this section or part.

If within 5 years of the original installation date of an appliance supplied by A.O. Smith following verification and at the sole option of A.O. Smith, it transpires that the heat exchanger leaks from the water side, A.O. Smith will provide a complete new appliance of the same size and quality. The warranty period given on the replacement appliance shall be equal to the remaining warranty period of the original appliance that was supplied. Notwithstanding the stipulations earlier in this article, in the event that unfiltered or softened water is used, or allowed to stand in the appliance, the warranty shall be reduced to one year from the original installation date.

The warranty set out in article 1 and 2 will apply solely under the following conditions:

a. The appliance is installed under strict adherence to the installation

instructions of A.O. Smith for the specific model, and the relevant local authority installation and building codes, rules and regulations in force.

b. The appliance remains installed at the original site of installation.

c. The appliance is exclusively used with drinking water, which at all times

can freely circulate (a separately installed heat exchanger is mandatory for heating salt water or corrosive water).

d. The storage tank is safeguarded against harmful scaling and lime

accretion by means of periodic maintenance.

e. The water temperatures in the appliance do not exceed the maximum

setting of the thermostats, which form a part of the appliance.

f. The water pressure and/or heat load do not exceed the maximum values

stated on the appliance's rating plate.

g. The appliance is installed in a non-corrosive atmosphere or

environment.

h. The appliance is connected to a protected cold supply arrangement,

which is: approved by the relevant authority; has sufficient capacity for this purpose; supplying a pressure no greater than the working pressure stated on the appliance; and where applicable by a likewise approved temperature and pressure relief valve, fitted in accordance with the installation instructions of A.O. Smith applying to the specific model of the appliance, and further in compliance with the government and local authority installation and building codes, rules and regulations.

i. The storage tank is at all times fitted with cathodic protection. If sacrificial

anodes are used for this, these must be replaced and renewed when, and as soon as, they are 60% consumed or more. When electric anodes are used, it is important to ensure that they continue to work properly.

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Warranty (certificate)

gis

16.4 Exclusions

16.5 Scope of the warranty

16.6 Claims

16.7 Obligations of A.O. Smith

The warranty set out in articles 1 and 2 will not apply in the event of:

a. damage to the appliance caused by an external factor;

b. misuse, neglect (including frost damage), modification, incorrect and/or

unauthorised use of the appliance and any attempt to repair leaks;

c. contaminants or other substances having been allowed to enter the

storage tank;

d. the conductivity of the water being less than 125µS/cm and/or the

hardness (alkaline-earth ions) of the water being less than 1.00 mmol/l (3.3.3 "Water composition");

e. unfiltered, recirculated water flowing through or being stored in the

appliance;

f. any attempts at repair to a defective appliance other than by an

approved service engineer.

The obligations of A.O. Smith by virtue of the warranty provided do not extend beyond delivery free of charge from the warehouse of the parts or components or appliance to be replaced; transport, labour, installation and other costs associated with the replacement will not be borne by A.O. Smith.

A claim on grounds of the specified warranty must be submitted to the dealer from whom the appliance was purchased, or to another authorised dealer for the products of A.O. Smith Water Products Company. Inspection of the appliance as referred to in articles 1 and 2 shall take place in one of the laboratories of A.O. Smith.

A.O. Smith grants no other warranty or guarantee over its appliances nor the (parts or components of) appliances supplied for replacement, other than the warranty expressly set out in this Certificate.

A.O. Smith is not liable for damage to persons or property caused by (parts or components, or the glass-lined steel storage tank of) a (replacement) appliance that it has supplied under the terms of this warranty, nor on any other grounds.

94 Instruction manual GWV

Page 95

17 Appendices

17.1 Introduction

This appendix contains:

• Electrical diagram (17.2 "Electrical diagram")

• Week program card

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Page 96

Appendices

17.2 Electrical diagram

230VAC50Hz

18 17 16 15 14 13 12 11 10

8 7

5 4

2 1

Electrical diagram

X XJ2

F1F3

JP2

J20

J21

J19

J29

JP8

J33

XXX XX

J34

J39

J36

J35

D E

436

J38

1516 1314 1112 910

JP11

78 56 34 12

JP3

4 4

JP4

JP12

JP5

JP6

J37

448

337

226

115

2 3 4 5 6 7

1 = brown, 2 = blue, 3 = yellow/green, 4 = black, 5 = white, 6 = orange, 7 = red

0308191 R1

96 Instruction manual GWV

Page 97

TERMINAL BLOCK CONNECTIONS:

Earth N Neutral L Phase input of controller

Phase input of system pump

Phase input of program-controlled pump

COMPONENTS:

A Controller B Flame probe C Hot surface igniter D Gas control 1 E Gas control 2 F Display GFan H External ON mode switch Jn/a K Alarm signal Ln/a M Program-controlled pump N System pump P Double-pole isolator Q 0/1 switch of controller R Temperature sensor (T1 - heat exchanger inlet) S Dummy T Temperature sensor (T3 -Tank) U Temperature sensor (T2 - heat exchanger outlet) V Selection resistor W Air pressure switch X Flow-through switch

CONTROLLER CONNECTIONS:

J2 Connection for controller power J19 Connection for system pump and alarm signal J20 Connection for gas controls J21 Program-controlled pump connection J29 n/a J33 Fan connection J36 Connection of display to controller JP2 Flame probe and hot surface igniter connection JP3 Temperature sensor T1 connection JP4 Dummy connection JP5 Connection for temperature sensors T2 and T3 JP6 Selection resistor and air pressure switch connection JP8 Extra ON mode switch connection JP12 Connection for flow-through switch F1 Fuse F3 Fuse

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Appendices

98 Instruction manual GWV

Page 99

17.3 Week program card

You can cut the week program card out and keep it near the appliance.

Period DAY TIME Tset Pump

10.

11.

OFF

....°C

ON/ OFF

Period DAY TIME Tset Pump

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

OFF

....°C

ON/ OFF

Example

Period DAY TIME Tset Pump

ON MO

OFF MO

14:30

16:15

70°C

ON/ OFF

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Page 100

Instruction manual GWV 100