A.O. Smith SGS - 100, SGS - 80

Installation

36 Instruction manual SGS

3is

Connector block

In preparation, you must first remove the two plastic covers and the protective

cap of the electrical section.

1. Undo the screws of the plastic covers.

2. Carefully remove the covers from the appliance.

The electrical section is now visible.

3. 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.

Electrical connector block

Legend

A. screws

B. protective cap

C. connector block

IMD-0224 R3

BUS-

link

Frequency

controller

Exter-

nal

ON/OF

Program-

controlled

pump

Alarm Off Isolating transformer Power

primary secondary

X5X6NL

5X3X4X3X4NL

4X1X2NL

2NL

3NL

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Contents

Main Page Instruction manual SGS 3 Read this manual carefully Trademarks Liability More information Page Instruction manual SGS 5 Table of contents 1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - 9 2 Working principle of the appliance- - - - - - - - - - - - - - - 13 3 Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - 19 6 Draining - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51 8 Status of the appliance - - - - - - - - - - - - - - - - - - - - - 57 9 Starting and running - - - - - - - - - - - - - - - - - - - - - - 59 10 Shutting down - - - - - - - - - - - - - - - - - - - - - - - - - 61 11 Main menu - - - - - - - - - - - - - - - - - - - - - - - - - - - 63 12 Service program - - - - - - - - - - - - - - - - - - - - - - - - 71 Page Page Instruction manual SGS 9 1 Introduction 1.1 About the appliance 1.2 What to do if you smell gas 1.3 Regulations 10 Instruction manual SGS 1gis 1.4 Target groups 1.5 Maintenance 1.6 Forms of notation Instruction manual SGS 11 1.7 Overview of this document Page Instruction manual SGS 13 2 Working principle of the appliance 2.1 Introduction 2.2 General working principle of the appliance 14 Instruction manual SGS 2.3 The appliance's heating cycle Instruction manual SGS 15 2.4 Protection for the appliance 2.4.1 Introduction 16 Instruction manual SGS 2.4.2 Appliance water temperature protection 2.4.3 Water temperature protection for the storage tank 2.4.4 Gas valve 2.4.5 Fan Instruction manual SGS 17 2.4.6 Pressure switch 2.4.7 Flame probe 2.5 Safety of the installation 2.5.1 Unvented installation 18 Instruction manual SGS 2.5.4 Protection for the solar heating system Drain-back tank Fluid temperature 2.5.5 Safety of the solar heating system Expansion vessel Expansion valve 3 Installation 3.1 Introduction 3.2 Packaging 3.3 Environmental conditions 20 Instruction manual SGS 3.3.1 Air humidity and ambient temperature 3.3.2 Maximum floor load Maximum floor load Maximum floor load of storage tank Instruction manual SGS 21 3.3.4 Appliance working clearances 3.3.5 Storage tank working clearances Installation 22 Instruction manual SGS 3.4 Technical specifications IMD-0220 R4 3.4.1 Dimensions of the appliance Plan and elevation of the appliance Legend See the table. Instruction manual SGS 23 3.4.2 General and electrical specifications 24 Instruction manual SGS 3.4.3 Gas data Page 26 Instruction manual SGS 3.6 Water connections, Vented 3.6.1 Cold water side 3.6.2 Hot water side Instruction manual SGS 27 3.6.3 Circulation pipe 3.7 Water connections, Unvented 3.7.1 Cold water side 3.7.2 Hot water side 28 Instruction manual SGS 3.7.4 Condensation drainage 3.8 Gas connection 3.9 Solar heating system 3.10 Air supply and flue 3.10.1 Introduction Page Page Instruction manual SGS 31 3.10.3 Concentric connections Page Instruction manual SGS 33 3.10.4 Parallel connections 34 Instruction manual SGS Practical example of parallel flue gas discharge Instruction manual SGS 35 3.11 Electrical connection 3.11.1 Introduction 3.11.2 Preparation Page Instruction manual SGS 37 3.11.3 Connecting the mains voltage 3.11.4 Isolating transformer 3.11.5 Connecting a program-controlled pump 3.11.6 Connecting an extra ON mode switch ("Tank ON") 38 Instruction manual SGS 3.11.7 Connecting an extra error signal ('Alarm OUT' ) 3.11.8 Connecting communication cable to solar heating system 3.12 Electrically connecting the solar heating system controller 3.12.1 Preparation Instruction manual SGS 39 3.12.2 Connecting the mains power 3.12.3 Connecting pump station - modulating pump 3.12.4 Connecting solar collector 3.12.5 Connecting tank sensor 40 Instruction manual SGS 3.12.7 Connecting communication cable 3.12.8 Connecting extra head pump 3.12.9 Connecting Q/T sensor Instruction manual SGS 41 3.13 Checking the supply pressure and burner pressure 3.13.1 Preparation 42 Instruction manual SGS 3.13.2 Procedure to check pressures Instruction manual SGS 43 3.13.3 Adjusting the pressure 3.13.4 Finalising Page 4 Conversion to a different gas category 4is Page 48 Instruction manual SGS 5gis 5.2 Filling unvented installations 5.3 Filling vented installations Instruction manual SGS 49 5.4 Filling solar heating system 5.4.1 Filling solar heating system with glycol 5gis Page 52 Instruction manual SGS 6gis 6.2 Draining unvented installations Instruction manual SGS 53 6.3 Draining vented installations 54 Instruction manual SGS 6gis 6.4 Draining solar heating system 6.4.1 Draining glycol-filled system Instruction manual SGS 55 7 The control panel 7.1 Introduction 7.2 Controls 7.3 Meaning of icons 7.4 Electronic controller ON/OFF switch 7gis 7.5 Navigation buttons 7.6 PC connection Instruction manual SGS 57 8 Status of the appliance 8.3.1 8.3 8.2.2 8.2.1 8gis 8.4 Error conditions 8.5 Service condition Instruction manual SGS 59 9 Starting and running 9.1 Introduction 9.2 Starting the appliance 9.3 The appliance's heating cycle 9gis Instruction manual SGS 61 10 Shutting down 10.1 Introduction 10.2 Shut the appliance down for a brief period ("OFF mode") 10.3 Electrically isolating the appliance 10.4 Shutting the appliance down for a long period Page Instruction manual SGS 63 11 Main menu 11.1 Introduction 11.2 Notational convention for menu-related instructions 11.3 Switching on the "ON mode" 11.4 Setting the water temperature 11.4.1 Setting the water temperature via the SET POINT MENU 64 Instruction manual SGS 11.4.2 Setting water temperature during ON mode 11.5 Week program 11.6 Starting and stopping the week program 11.7 Changing the appliance's standard week program Instruction manual SGS 65 11.7.1 Week program: setting the switch- on time 11.7.2 Week program: setting the switch- off time 11.7.3 Week program: setting the water temperature 66 Instruction manual SGS 11.7.4 Week program: setting the program- controlled pump 11.8 Adding times to a week program Instruction manual SGS 67 11.9 Deleting times from a week program 11.10 Extra period 68 Instruction manual SGS 11.11 Programming an extra period Instruction manual SGS 69 11.12 Se ttings 11.12.1 Setting menu language 11.12.2 Setting day and time 70 Instruction manual SGS 11.12.3 Displaying appliance specifications Instruction manual SGS 71 12 Service program 12.1 Introduction 12.2 Setting the hysteresis 12.3 Displaying the error history 12.4 Displaying the appliance history 12 is 12.5 Display the selected appliance 12.6 Setting the service interval 12.7 Setting legionella prevention 12.7.1 Switching legionella prevention on and off Instruction manual SGS 73 12.8.1 Setting the drain-back tank 12.8.2 Setting the heating fluid type in the solar heating system 12.8.3 Setting threshold temperature of pump in solar heating system 12.8.4 Setting the solar limit temperature 12 is 12.8.7 Reading the energy contribution of the solar heating system 12.9 Setting the central heating configuration Instruction manual SGS 75 13 Troubleshooting 13.1 Introduction Instruction manual SGS 76 13.2 Troubleshooting table for general errors Page Page Instruction manual SGS 79 13.3 Troubleshooting table for displayed errors Page Page Page Page Page Page Page Page Page Page Instruction manual SGS 90 13.4 Displayed warnings Instruction manual SGS 91 14 Maintenance frequency 14.1 Introduction 14.2 Determining service interval Page Instruction manual SGS 93 s 15 Performing maintenance 15.1 Introduction 15.2 Preparation for maintenance 15 s Instruction manual SGS 95 s 15.3 Water-side maintenance 15.3.1 Introduction 15.3.2 Checking the anodes 15.3.3 Descaling and cleaning the appliance and storage tank 15 s Instruction manual SGS 97 16 Warranty (certificate) 16.1 General warranty 16.2 Tank warranty 16.3 Conditions for Installation and use 98 Instruction manual SGS 16 gis 16.4 Exclusions 16.5 Scope of the warranty 16.6 Claims 16.7 Obligations of A.O. Smith 17 Appendices Appendices 100 Instruction manual SGS 17 is 17.2 Menu structure Page Page Page Page Instruction manual SGS 105 17.4.1 Solar system electrical diagram legend Page Instruction manual SGS 107 17.5 Week program card Page Instruction manual SGS 109 Index A B C D 0308 853 1. UK Index P R S