A.O. Smith SGS-28 Installation, User And Service Manual Download Page 4 | Manualshive

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Regulations

Gas Safety (installations and Use) Regulations 1998 (as

amended).

It is law that all gas appliances are installed by competent persons, in accordance with the
above regulations. Failure to install appliances correctly could lead to prosecution. It is in
your own interest and that of safety, to ensure that this law is complied with.

The installation of the water heater MUST be in accordance with the relevant requirements
of the Gas Safety Regulations, Building Regulations, IEE Regulations and the Water Supply
(water fittings) Regulations. The installation should also be in accordance with any
relevant requirements of the HSE, local gas region and local authority and the relevant
recommendations of the following documents:

British and European Standards

BS 6891:
Installation of low pressure gas pipework of up to 35 mm (R1¼) in domestic
premises (2nd family gas) - Specification. Note: for lager installations see IGE/UP/2
below.
BS 6798:
Specification for installation and maintenance of gas-fired boilers of rated input not
exceeding 70 kW net.
BS 6644:
Specification for installation of gas-fired hot water boilers of rated inputs between 70
kW (net) and 1.8 MW (net) (2nd and 3rd family gases).
BS 6700:
Design, installation, testing and maintenance of services supplying water for
domestic use within buildings and their cartilages - Specifications
BS EN 806-2:
Specification for installations inside buildings conveying water for human
consumption. Part 2: Design.
BS 5546:
Specification for installation of hot water supplies for domestic purposes, using gas-
fired appliances of rated input not exceeding 70 kW.
BS 5440:
Flueing and ventilation for gas appliances of rated input not exceeding 70 kW net
(1st, 2nd and 3rd family gases).

Part 1: Specification for installation of gas appliances to chimneys and for
maintenance of chimneys.
Part 2: Specification for installation and maintenance of ventilation for gas
appliances.

Institute of Gas Engineers and Managers (IGEM) Publications

IGE/UP/1:
Soundness testing and purging of industrial and commercial gas installations.
IGE/UP/1A:
Soundness testing and direct purging of small low pressure industrial and commercial
natural gas installations.
IGE/UP/2:
Gas installation pipework, boosters and compressors on industrial and commercial
premises.
IGE/UP/10:
Installation of flued gas appliances in industrial and commercial premises.

CIBSE Publications

Guide G:
Public Health Engineering

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Summary of Contents for SGS-28

Page 1: ...0311753 Innovation has a name Installation User and Service Manual Condensing High Efficiency Gas Solar Water Heater SGS 28 30 50 60 80 100 120 SGS 3017 Changes Reserved ...

Page 2: ...A O Smith UK Unit B8 Amstrong Mall Southwood Business Park Farnborough Hampshire GU14 0NR www aosmith co uk A O Smith Water Heaters is a trading name of Advance Services Sales Ltd Reg your installer ...

Page 3: ...s manual use other than in accordance with the General Conditions registered at the Chamber of Commerce For more information refer to the General Conditions These are available on request free of charge We believe that this manual provides you with accurate and complete descriptions of all relevant components If you nonetheless find errors or inaccuracies in this manual please inform A O Smith Thi...

Page 4: ... boilers of rated inputs between 70 kW net and 1 8 MW net 2nd and 3rd family gases BS 6700 Design installation testing and maintenance of services supplying water for domestic use within buildings and their cartilages Specifications BS EN 806 2 Specification for installations inside buildings conveying water for human consumption Part 2 Design BS 5546 Specification for installation of hot water su...

Page 5: ...x 70 5500 AB Veldhoven The Netherlands Telephone 0870 AOSMITH free 0870 267 64 84 General 31 40 294 25 00 Fax 31 40 294 25 39 E mail info aosmith nl Website www aosmith co uk In the event of problems with your gas electricity or water supply connections contact your supplier 0311753_SGS_28 120_II_UKUK_V2 0 2017 05 03 5 ...

Page 6: ...6 ...

Page 7: ...ribes the correct installation and maintenance procedures Target group The information in this manual applies to three target groups users installation engineers service and maintenance engineers The User part is intended for the end users The Installation Maintenance and Service part is intended for the installation engineers and the service and maintenance engineers Notation conventions This man...

Page 8: ...eed special attention Note A note gives more information on a topic Caution Obey the caution instructions to prevent damage of the water heater Warning Obey the warning instructions to prevent danger of personal injury and serious damage to the water heater Document identification Article number Language Version 0311753 EN 2 0 n c w 8 ...

Page 9: ... User part 13 1 Introduction 15 2 Safety 17 3 Interface 19 3 1 Operator interface 19 3 2 Explanation of icons 19 3 3 Control switch 20 3 4 Buttons 20 3 5 PC connection 21 3 6 Status of the water heater 21 3 6 1 Operating modes 21 3 6 2 Error conditions 22 3 6 3 Service conditions 23 3 6 4 Anode warning 23 3 6 5 Q T Sensor warning 23 3 6 6 Collector temperature warning 23 0311753_SGS_28 120_II_UKUK...

Page 10: ...ram 30 4 3 7 Adding times to a week program 33 4 3 8 Deleting times from a week program 34 4 3 9 Extra period 35 4 3 10 Settings 37 Installation Maintenance and Service part 41 5 Introduction 43 5 1 About the water heater 43 5 2 The appliance s heating cycle 43 5 3 Working principle 43 5 4 Operating cycle 45 6 Safety 47 6 1 Safety instructions 47 6 2 Instructions on the water heater 48 6 3 Safety ...

Page 11: ...1 Preparation 66 7 8 2 Mains power 66 7 8 3 Optional electrical connections 67 7 8 4 Electrical connection of the solar heating system 68 7 9 Commissioning 70 7 9 1 Filling 70 7 9 2 Procedure for checking the supply pressure 72 7 9 3 Procedure for checking the gas control valve pressure 74 7 9 4 CO2 adjustment 75 7 9 5 Switching pressure measurement 77 7 9 6 Turn on the water heater 78 7 10 Decomm...

Page 12: ... 93 10 3 Gas side maintenance 93 10 3 1 Clean the burner 93 10 3 2 Clean the heat exchanger 93 10 4 Solar collector maintenance 94 10 5 Finalization 94 11 Troubleshooting 95 11 1 Errors and warnings 95 11 1 1 General errors 96 11 1 2 Displayed errors 97 11 1 3 Warnings 102 12 Appendices 105 12 1 Technical details 105 12 2 Dimensions 109 12 3 Gas details 113 12 4 Week program card 115 12 5 Electric...

Page 13: ...User part 0311753_SGS_28 120_II_UKUK_V2 0 2017 05 03 13 ...

Page 14: ...14 ...

Page 15: ...hrough the water inlet 1 The heated water leaves the tank at the top through the hot water outlet 2 To operate the water heater the operator interface 3 and control switch 4 are used Fig SGS water heater 1 2 3 4 1 Water inlet 2 Water outlet 3 Operator interface 4 Control switch 0311753_SGS_28 120_II_UKUK_V2 0 2017 05 03 15 ...

Page 16: ...16 User part ...

Page 17: ...ter Some propellants bleaching agents and degreasing agents etc disperse of explosive vapors and or cause accelerated corrosion If the water heater is used in a room where such substances are stored or used the warranty will be void Caution Installation maintenance and service may only by carried out by a qualified engineer Caution The water heater is not intended for use by persons with reduced p...

Page 18: ...18 User part ...

Page 19: ...e main menu see section 4 3 The service program This chapter is specifically intended for the service and maintenance engineer and installation engineer In this manual the display of the operator interface is shown as in the figure both with and without icons 3 2 Explanation of icons The table explains the meanings of the icons Name Explanation Heat demand Heat demand detected Purge Pre and post p...

Page 20: ...the water heater and the mains power supply 3 4 Buttons The use of these buttons is explained with the help of the figure showing the main menu see section 4 3 The buttons are Buttons for UP and DOWN Enter ENTER Reset button RESET The arrows and indicate that you can scroll up and or down Use and to scroll The cursor points to the option to be activated In the display as shown in the figure you ca...

Page 21: ...D 3 6 1 2 ON In this mode the water heater 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 see section 4 1 1 line three the programmed water temperature Tset line four is empty when the water heater is idle or depending on the operating cycle see section 4 1 1 displays a text such as HEAT...

Page 22: ...ine three the next scheduled switch on time line four displays the text PERIOD ACTIVATED In all modes the temperature may at any moment drop below the desired temperature The water heater then enters an operating cycle This operating cycle see section 4 1 1 is identical for all basic operating modes Note Setting and if necessary programming of the basic operating modes are described in the main me...

Page 23: ...e warning This message appears when the anode protection is no longer active If the message appears you must contact your service and maintenance engineer Note The water heater continues to function when this message appears If you ignore the anode warning the tank protection cannot be guaranteed The warranty will be void 3 6 5 Q T Sensor warning This message appears if the Q T sensor has not been...

Page 24: ...24 User part ...

Page 25: ...liance is now in ON mode If there is a heat demand the appliance will run through the heating cycle see section 4 1 1 If the heating cycle is not run there is no heat demand if this is the case Tset will probably need to be set see section 4 3 3 4 1 1 The appliance s heating cycle The entire cycle is explained in the following example which assumes the water heater is in operating mode ON Note The...

Page 26: ...nd are dimmed The icon is activated After a number of seconds pre glow the gas control valve is opened and ignition takes place The icon is activated The message IGNITION appears After ignition the flame is detected and the appliance will be running This means that actual heating has started The icon is dimmed The icon is activated The message RUNNING appears When the water is up to temperature th...

Page 27: ...water heater will heat the water to 20 C Tset before dropping back to mode OFF Caution The anode protection remains active when the OFF mode is selected Note These values of 5 C and 20 C cannot be adjusted Note If the water heater is not used for longer than two months and the water is not drained air bubbles may form in the water heater This can lead to air in the water pipes 4 2 2 Isolate from t...

Page 28: ...espond to demand only during pre programmed periods see section 4 3 4 Outside those periods only frost protection is active EXTRA PERIOD Select this option to overrule OFF mode or PROG mode i e Week program so that a single temporary period see section 4 3 9 of heat demand will be fulfilled SETTINGS Select this option to set the language and the time see section 4 3 10 You can also use this option...

Page 29: ...ecrease the value Confirm with ENTER After confirming the appliance enters ON mode Note If the preset temperature is higher than the current water temperature then the appliance might not immediately start the heating cycle To prevent excessively frequent switching on and off there is a heating margin The standard setting for this margin is 5 C The appliance starts heating up if the water temperat...

Page 30: ...ging the appliance s standard week program see section 4 3 6 Adding times to a week program see section 4 3 7 Deleting times from a week program see section 4 3 8 4 3 5 Starting and stopping the week program The week program can be started up from any other operating mode as follows WEEK PROGRAM START OPERATION Confirm with ENTER A week program can be shut down simply by activating a different ope...

Page 31: ... the mode of the program controlled pump 4 3 6 1 Week program setting the switch on time Bring the cursor to SU Confirm with ENTER The day indicated by blinks Use and to set the desired day In the example this is SU Sunday Confirm with ENTER The cursor moves to the hour digits which will blink Use and to set the hours In the example this is 08 Confirm with ENTER The cursor moves to the minute digi...

Page 32: ...m setting the program controlled pump If required a pump can be controlled during the period Use and to set PUMP ON The pump 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 ENTER The cursor moves to SAVE Confirm with ENTER The display shown in the figure will appear If you wish you can use to sc...

Page 33: ... program an extra period in which the switch on time is set to 18 00 and the corresponding switch off time to 22 00 The water temperature will be set to 75ºC and the pump will run continuously Proceed as follows Set the switch on time see section 4 3 6 1 Set the switch off time see section 4 3 6 2 Set the water temperature see section 4 3 6 3 Set the program controlled pump see section 4 3 6 4 To ...

Page 34: ...RAM OVERVIEW Confirm with ENTER Scroll with to PROGRAM OVERVIEW Confirm with ENTER The display shows the menu for the week program Scroll with to DELETE Confirm with ENTER To warn you that you are now working in the delete sub menu the cursor is replaced with an exclamation mark and the period settings will blink Scroll with to the day to be deleted For example SU Sunday in the second period See t...

Page 35: ... the active week program or without taking the water heater out of OFF mode frost protection active If the water heater is running under an extra period then this is indicated in the display with the text EXTRA During the extra period if the water temperature becomes too low the water heater will run through the operating cycle see section 4 1 1 then return to the extra period The same settings ca...

Page 36: ...gits of the switch off period Setting the switch off time Use and to set the hours In the example this is 012 Confirm with ENTER The cursor moves to the minute digits which will blink Use and to set the minutes In the example this is 45 Confirm with ENTER The cursor moves to the water temperature See the figure Setting the water temperature Use and to set the water temperature In the example this ...

Page 37: ... and time Displayable water heater specifications this category is only relevant to the installation engineer and or service and maintenance engineer Regulation interval water temperature Ignition speed of fan Working speed of fan 4 3 10 1 Setting menu language To set menu language Call up the menu for selecting the language as follows SETTINGS Confirm with ENTER The display shows the menu for set...

Page 38: ...ide Sunday Scroll with and to the desired day Confirm with ENTER The day has been set The display shows the submenu for adjusting the time The cursor moves to the hour digits which will blink Scroll with and to the current hour for example 15 Confirm with ENTER The cursor moves to the minute digits which will blink Scroll with and to the next minute for example 45 Confirm the minute setting with E...

Page 39: ...ectrical data see section 12 1 Call up the menu to display the water heater specifications as follows SETTINGS Confirm with ENTER Scroll with to SPECIFICATIONS Confirm with ENTER The display shows the sub menu for displaying water heater specifications Scroll with to the section to be displayed for example REGULATION INTERVAL The corresponding display appears n 1 2 3 0311753_SGS_28 120_II_UKUK_V2 ...

Page 40: ...40 User part ...

Page 41: ...Installation Maintenance and Service part 0311753_SGS_28 120_II_UKUK_V2 0 2017 05 03 41 ...

Page 42: ...42 User part ...

Page 43: ...rs the bottom of the tank through the cold water inlet 14 Once the water heater and the storage reservoir are completely filled with water they are both constantly under mains water pressure When hot water is drawn from the water heater it is immediately replenished with hot water from the storage tank which in turn is replenished with cold water The water in the storage tank is heated by a heat e...

Page 44: ...5 24 23 22 3 58 19 29 10 8 14 16 18 20 30 21 17 18 20 17 21 30 59 16 Fig Water heater SGS 80 100 120 1 2 5 7 4 6 28 9 11 13 12 15 24 23 22 3 58 19 29 10 8 14 16 18 20 30 21 17 1 Cover 2 Hot water outlet 3 Electrical connector block 4 Controller 5 Pressure switch 6 Control panel 7 Temperature sensor T1 8 Combustion chamber 9 Anode 10 Tank 11 Heat exchanger 12 Inspection and cleaning opening 13 Temp...

Page 45: ...heating the water but only if the temperature of the heating fluid S1 is greater than the temperature measured at the appliance sensor S2 by a given adjustable amount When T1 Tset Tsolar limit heating by the solar heating system stops There is one exception to this rule which is when Tsolar limit is set to a higher value than Tset Hysteresis The moment that T1 falls below Tset Tsolar diff hysteres...

Page 46: ...Note T1 can rise above Tset However this is only possible if Tsolar limit is increased via the service menu n 46 Installation Maintenance and Service part ...

Page 47: ...nd the flue gas discharge components Make sure that the venting system does not exceed the maximum number of 45º and 90º bends and the maximum pipe length Caution Make sure that the diameter and length of the gas supply pipe are large enough to supply sufficient capacity to the water heater Caution Make sure that the condensate drain is connected to the waste water discharge using an open connecti...

Page 48: ...ater The water heater has some safety instructions on its cover The text Read the installation instructions before installing the appliance The text Read the user instructions before putting the appliance into operation Also the packaging has some safety instructions The text Read the installation instructions before installing the appliance The text Read the user instructions before putting the a...

Page 49: ... tank that are related to safety Safety Description Anti frost S2 S3 5 ºC The frost protection cuts in The water is heated to 20 C Against overheating of water S2 S3 85 ºC The high limit safeguard serves to prevent overheating and or excessive formation of scale in the storage tank If the high limit safeguard is activated the heating is stopped This causes the water in the storage tank to cool dow...

Page 50: ...om flowing backwards from the tank into the cold water supply system The pressure reducing valve protects the water heater against excess mains water pressure refer to the general and electric specifications in the appendices see section 12 These components are installed in the cold water inlet see section 7 4 2 6 3 2 2 Vented installation With a vented installation excess pressure is taken up by ...

Page 51: ... system enters error mode The error is also visible on the display of the water heater 6 3 4 Safety of the solar heating system 6 3 4 1 Expansion vessel The solar heating system must be equipped with an expansion vessel An expansion vessel serves to limit pressure variations in the system The expansion vessel in the solar heating system can withstand a maximum pressure of 600 kPa 6 bar The supply ...

Page 52: ... be recycled When you discard devices at the end of their service life you must obey local legislation related to waste disposal Never discard your old device together with regular waste Put the device into a municipal waste collection depot for electrical and electronic equipment If necessary ask your supplier or your service and maintenance engineer for advice 52 Installation Maintenance and Ser...

Page 53: ...lly to prevent damage to the water heater 7 2 Conditions The water heater is suitable for room sealed and for open combustion For room sealed combustion the air inlet does not depend on the installation site For open combustion you must comply with the local applicable directives and ventilation regulations for open water heaters 7 2 1 Ambient conditions The installation site must be frost free If...

Page 54: ... 2 4 Working clearances For access to the water heater it is recommended that the following clearances are observed see figure AA around the water heater s control column and cleaning openings 100 cm BB all sides of the water heater 50 cm Top of the water heater 100 cm Fig Working clearances SGS 28 60 Fig Working clearances SGS 80 120 A A AA B B B B A A AA Note When installing the water heater be ...

Page 55: ...e the storage tank space for anode replacement 100 cm Note When installing the storage tank be aware that any leakage can cause damage to the immediate environment or floors below the level of the boiler room If this is the case the water heater should be installed above a waste water drain or in a suitable metal leak tray n 0311753_SGS_28 120_II_UKUK_V2 0 2017 05 03 55 ...

Page 56: ...at exchanger 3 T P valve 12 Temperature gauge recommended 37 Combined Q T sensor optional G Heat exchanger return 4 Stop valve recommended H Overflow protection 5 Non return valve mandatory 13 Condensation drain mandatory 38 Solar heating system pump station modulating mandatory S1 Collector sensor mandatory 6 Circulation pump optional pump flow 1500 l h e g Grundfos ST 15 11 2 14 Draw off points ...

Page 57: ... bar Because the pressure in the water pipe at times can exceed 8 bar you must fit an approved pressure reducing valve 1 Fit a non return valve 5 and an expansion vessel 16 Fit an expansion valve 15 and connect the overflow side to an open waste water pipe 7 4 1 2 Hot water side See B in the installation diagram Note Insulating long hot water pipes prevents unnecessary energy loss Optional fit a t...

Page 58: ...temperature of the tap water Fit a stop valve 4 in the hot water outlet pipe for servicing If a circulation pipe is required continue by installing the circulation pipe see section 7 4 1 3 7 4 2 3 Circulation pipe See C in the 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 Fit...

Page 59: ...ct the lead to the solar heating system controller and sensor S2 see electrical diagram and connections table see section 7 8 4 1 Connect the communication cable between the solar heating system controller and the water heater see electrical diagram and connections table see section 7 8 4 1 Warning The installation diagram shows a pump station with an integrated non return valve This type of pump ...

Page 60: ...local regulations The water heater is intended to be connected to a separately approved and marketed venting system This manual does not discus installation type B23 When you need a B23 system contact A O Smith for more information Caution Always make sure that the flue gas outlet discharges into an area approved for the correct type of installation Caution The use of a different wall or roof term...

Page 61: ...m 130 mm Diameter air inlet 150 mm 200 mm Description parts A O Smith Part number A O Smith Part number Wall terminal set A wall terminal 1 a 500 mm concentric pipe and a 90 bend 0302504 0311465 Wall terminal 0302505 0302313 Roof terminal set A roof terminal 2 a 1000 mm concentric pipe and a roof plate 0311463 0311464 Roof terminal 0311458 0306390 Concentric pipe 500 mm 0302499 0302301 Concentric ...

Page 62: ...ns stated in the table must be fulfilled Even if you use less than the stated maximum number of bends the maximum pipe length still may not be exceeded Even if you use less than the stated maximum pipe length the maximum number of bends still may not be exceeded 7 7 2 C13 C33 parallel systems Use a wall terminal set or a roof terminal set to install a C13 or a C33 parallel venting system Descripti...

Page 63: ...el venting systems Description Unit SGS 26 60 1 SGS 80 120 2 Default Diameter flue discharge air inlet mm 2x100 2x130 Maximum length air inlet m 55 65 Maximum length flue gas outlet m 55 65 Lequivalent 45 bend m 1 2 1 4 Lequivalent 90 bend m 4 6 2 4 Diameter enlargement Diameter flue discharge air inlet mm 2x130 2x150 Maximum length air inlet m 100 100 Maximum length flue gas outlet m 100 100 Lequ...

Page 64: ...l length exceeds the maximum length as stated in the table 7 7 3 C43 C53 C63 systems The length of the air inlet and flue gas outlet is the same for C43 C53 and C63 systems as for C13 and C33 systems Refer to C13 C33 concentric systems for the maximum pipe lengths of concentric systems Refer to C13 C33 parallel systems for the maximum pipe lengths of parallel systems and non concentric systems Not...

Page 65: ... Material flue gas outlet Thick walled aluminum Thick walled aluminum Material air inlet Diameter flue gas outlet 100 0 6 0 6 mm 130 0 6 0 6 mm Diameter air inlet Refer to C13 C33 parallel systems for the A O Smith part numbers The same parts can be used for the C43 C53 and C63 parallel systems Use the adapter box concentric to parallel water heater side part number 0312209 for C63 parallel system...

Page 66: ...Primary Secondary pump ON OFF link N L A N L1 A N L2 A X1 X2 A N L3 A X3 X4 X5 X6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 to 20 21 22 23 24 7 8 2 Mains power Note The water heater is supplied without a power cable and isolator Use a power cable with cores of at least 3 x 1 0 mm2 and a double pole isolator with a contact gap of at least 3 mm Connect the water heater to the mains power supply Connect...

Page 67: ...ontroller is 100W Connect neutral N live L and earth A to terminals 13 14 and 15 as indicated in the table see section 7 8 1 Fit the cable in the strain relief If you have no more connections to make Fit the cover on the terminal block Fit the covers onto the water heater 7 8 3 3 External ON mode switch External ON OFF is an option for connecting an external ON OFF switch In the OFF position the p...

Page 68: ...1 Preparation Remove the cover snap on type from the terminal block for the collector This has the following terminals 7 8 4 2 Connecting the mains power Note Just as with the water heater controller the solar heating system controller must have a permanent electrical connection to the mains power supply There must be a double pole isolator installed in the permanent connection This is the same do...

Page 69: ...n relief Continue see section 7 8 4 7 7 8 4 6 Connecting top tank sensor Using the blade connectors connect the sensor S3 lead to the sensor Connect the other end to terminals 1 and 3 of J14 Fit the cables in the strain relief Continue see section 7 8 4 7 7 8 4 7 Connecting communication cable Note The communication cable must always be connected otherwise neither the appliance nor the solar heati...

Page 70: ...e A Cold water flows into the water heater Fill the water heater until a full water jet flows from the nearest draw off point The water heater is completely full Open all draw off points to bleed the entire installation of air The water heater is now under water supply pressure Make sure that no water comes out of the expansion valve 15 or the T P valve 3 If water comes out Examine if the water su...

Page 71: ...lier of the appliance For any other system you should follow the procedure for that system Warning To avoid contaminating the glycol you should flush the solar heating system through with water before filling Flushing with water Connect a water supply to the filling point of the pump station Connect a drain hose to the drain point Open the taps of both supply and drain point Open the water supply ...

Page 72: ...hose in an environment friendly manner and according to local regulations 7 9 2 Procedure for checking the supply pressure To check the supply pressure proceed as follows Isolate the appliance from the power supply see section 4 2 2 Carefully remove the covers from the appliance The electrical section is now visible SGS 28 to 60 There is a test nipple before the gas control valve for natural gas a...

Page 73: ...gnite You must wait about 1 minute after the display shows the text RUNNING before reading the dynamic pressures the fan needs this time to get up to full speed so that you can get a reliable reading Use the pressure gauge to read the supply pressure and compare it against the value from the gas table see section 12 3 Note Consult the mains gas supply company if the supply pressure is not correct ...

Page 74: ... supply Connect a pressure gauge to the test nipple Switch on the power to the appliance using the isolator on the appliance Switch the controller ON by setting the 0 I switch to position I The display will now show INTERNAL CHECK for about 10 seconds and will then go to the main menu 7 9 3 1 Procedure for checking the gas control valve pressure Select SERVICE OPERATION FULL LOAD from the service ...

Page 75: ... the appliance until it is cold or by raising the value for Tset in the SERVICE menu Use for this Full load measurement From the service menu select SERVICE OPERATION FULL LOAD Confirm with ENTER The appliance is now in FULL LOAD mode and will ignite The appliance is now running at FULL LOAD Read the value from the CO2 meter and wait until this measured value has remained stable for some time This...

Page 76: ... start the appliance up Switch off the appliance Turn off the gas supply to the appliance Put the covers back on the appliance Contact the appliance s supplier Partial load measurement From the service menu select SERVICE OPERATION PARTIAL LOAD Confirm with ENTER The appliance is now in PARTIAL LOAD mode and will ignite The appliance is now running at PARTIAL LOAD Read the value from the CO2 meter...

Page 77: ...le of the flue gas outlet pipe Shut off the gas supply Replace the covers 7 9 5 Switching pressure measurement To measure the switching pressure proceed as follows Isolate the appliance from the power supply see section 4 2 2 Carefully remove the covers from the appliance The electrical section is now visible Remove the black caps from the measurement point of the pressure switch Connect the of th...

Page 78: ...Drain the water heater 7 10 1 Turn off the water heater Refer to the procedure in the user part to Turn off the water heater see section 4 2 and isolate the water heater from the mains power supply 7 10 2 Draining 7 10 2 1 Draining unvented installations Some service activities require the water heater to be drained The procedure is as follows Activate the MENU with Position the cursor in front of...

Page 79: ...ty measures are required when working with the diluted glycol solution specified by the manufacturer For more information about the fluid please contact the manufacturer Activate the MENU with Position the cursor in front of OFF Confirm OFF with ENTER Wait until the fan has stopped The icon is then dimmed Caution Failure to wait until the fan stops can cause damage to the water heater Warning The ...

Page 80: ...Remove the hose Note Dispose of the drained glycol in an environment friendly manner and according to local regulations 14 n 80 Installation Maintenance and Service part ...

Page 81: ...You can order the conversion kit you need from the supplier of your water heater The conversion kit contains all the parts needed to do the conversion and a description of how to do the conversion The following conversions are possible Conversion from natural gas to LPG Conversion from LPG to natural gas Conversion from natural gas to natural gas Caution After the conversion make sure that the wat...

Page 82: ...82 Installation Maintenance and Service part ...

Page 83: ... the service interval Service mode Setting legionella prevention Solar heating system configuration Setting the central heating configuration These sub menus are briefly described in the following paragraphs Note The notation convention for the service menu is identical to that of the main menu see section 4 3 1 The difference is you use to bring up the service program instead of which brings up t...

Page 84: ...figure shows an example of Lock out errors In this case the text ERROR HISTORY is followed by L Note For an overview of all errors and the possible causes please refer to the relevant chapter see section 11 1 9 2 3 Display the water heater history The water heater history sub menu is used to display the burning hours the number of ignitions the number of flame errors and the number of ignition err...

Page 85: ...OPERATION to display the SERVICE OPERATION menu and can be used to switch between PARTIAL LOAD and FULL LOAD If there is a heat demand the water heater will first run through a startup cycle then continue to operate in FULL LOAD or PARTIAL LOAD mode If there is no heat demand the installation engineer must create one This can be done by draining the water heater until it is cold or by temporarily ...

Page 86: ... By default this period is set to Monday from 02 00 to 03 00 hours 9 2 7 1 Switching legionella prevention on and off To switch legionella prevention on or off select ANTI LEGIONELLA Select NO to switch legionella prevention off Select YES to switch legionella prevention on The following screen appears Select START to activate the period currently displayed The following display appears This displ...

Page 87: ...y Call up this menu as follows SETTINGS SOLAR TEST SOLAR PUMP The following display appears When START is selected the pump will start to run for two minutes Once the 2 minutes have elapsed the pump stops running again 9 2 8 3 Setting the solar limit The solar limit temperature is the maximum water temperature obtained in the appliance via the solar heating system measured by sensor T1 This value ...

Page 88: ... as follows SETTINGS SOLAR Q T SENSOR 9 2 8 6 Displaying contribution This option enables you to read out how much energy the solar heating system supplies For this data to be displayed the installation must be equipped with a Q T sensor see section 9 2 8 5 Three values are reported on the display ACTUAL actual energy the amount of energy currently being supplied LAST 24hr energy supplied over las...

Page 89: ...tral heating configuration Use this menu to specify whether a central heating system is connected to the installation Note This function is not yet available SETTINGS HEATING n 0311753_SGS_28 120_II_UKUK_V2 0 2017 05 03 89 ...

Page 90: ...90 Installation Maintenance and Service part ...

Page 91: ...spare parts look at the data plate for the full serial number the water heater model and the used gas category Use this information when you order the spare parts Do the following maintenance activities Preparation see section 10 1 Water side maintenance see section 10 2 Gas side maintenance see section 10 3 Solar collector maintenance see section 10 4 Finalization see section 10 5 10 1 Preparatio...

Page 92: ... from the discharge points of all valves and remove any scale deposits that may be present Drain the water heater see draining see section 7 10 2 10 2 Water side maintenance To do water side maintenance Descale the tank see section 10 2 1 Clean the condensate drain see section 10 2 2 10 2 1 Descale the tank Scale and lime build up prevent effective conduction of the heat to the water Periodic clea...

Page 93: ...3 Gas side maintenance Do gas side maintenance when the water heater does not operate correctly the air pressure differential is not correct and or the CO2 value is not correct To do gas side maintenance Clean the burner see section 10 3 1 Clean the heat exchanger see section 10 3 2 10 3 1 Clean the burner Detach the burner Remove all contamination present on the burner Fit the burner 10 3 2 Clean...

Page 94: ...Check the switching pressure of the pressure switch see section 7 9 5 Erase the message SERVICE REQUIRED The displayed message can be reset in either of two ways Temporary reset To postpone the message press once The message will reappear on the display 7 days later Full reset To fully reset the message press and hold both and at the same time for 5 sec On completion of the full reset of the messa...

Page 95: ...r resets automatically to resume operation The code is displayed continuously and the back light of the display blinks Errors are reported on the display as follows Line one an error code and a brief description The code consists of a letter and two digits Lines two three and four a long description alternating with a recommended action See the figures The first shows a possible error the second s...

Page 96: ...ion Tighten the threaded connection There is a condensate leakage Make sure that the condensation water discharge is working properly If necessary correct the water discharge There is a leakage from another nearby water heater or pipe segment Trace the leakage There is a leakage from the water heater tank Contact the supplier of your water heater Explosive ignition The gas supply pressure is incor...

Page 97: ...ur service and maintenance engineer if the error persists Code and description Cause Measure S01 blocking error Open circuit from temperature sensor T2 at the bottom of the tank Sensor is not correctly connected Connect the sensor lead to JP3 Damaged cable and or defective sensor Replace the cable and or sensor S02 blocking error Open circuit from sensor 1 of temperature sensor T1 at the top of ta...

Page 98: ...or sensor S13 blocking error Short circuit in sensor 2 of temperature sensor T1 at the top of the tank 1 Short circuit in sensor circuit Replace the cable and or sensor S14 blocking error Short circuit from dummy 1 Short circuit in sensor circuit Replace the cable dummy sensor 2 S15 blocking error Short circuit from dummy 2 Short circuit in sensor circuit Replace the cable dummy sensor 2 S17 block...

Page 99: ... between the pressure switch and the controller If necessary replace the wiring Pressure switch not closing Check the speed of the fan see section 12 1 Check that the hoses on the pressure switch and the air supply hose between fan and burner are correctly fitted Refit them if necessary Check for cracks in the hoses on the pressure switch and in the air supply hose between fan and burner If necess...

Page 100: ...ect roof or wall flue terminal has been installed see section 7 7 If necessary install the correct roof or wall flue terminal Check that the roof or wall flue terminal discharges into a permitted area F06 blocking error Short circuit between flame probe and earth Damaged cable in contact with metal surface or bent flame probe Check the wiring and the flame probe Replace the wiring and or flame pro...

Page 101: ...error message from the controller EEPROM read error 50 Hz error Internal communication error Internal error message from the controller 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 C03 blocking error Reset error Too many resets in too short a period Wait for the error to disappear max...

Page 102: ...anty will void Anode protection is not working The cables between the potentiostat and anodes are loose or have been connected incorrectly The earth connection of the anodes is loose The water heater is not filled with water Connect the wiring correctly and the warning will disappear If the wiring is correct but the warning remains check that the earth connection is good and whether the tank is fi...

Page 103: ...inutes pumping the fluid in the solar system round If Tcol Tcollector max after this has elapsed the pump will stop running for 30 minutes After 30 minutes the pump will start running again and the controller of the solar heating system checks whether Tcol is less than Tcollector max Drain back systems The solar system s pump stops running immediately for 30 minutes After 30 minutes the pump will ...

Page 104: ...104 Installation Maintenance and Service part ...

Page 105: ...C 2 12 2 12 2 12 2 12 Hysteresis downwards default value C 5 4 4 4 Solar differential adjustment range C 0 8 0 8 0 8 0 8 Solar differential default value C 7 2 2 2 Solar limit adjustment range C 65 80 65 80 65 80 65 80 Solar limit default value C 65 65 65 65 Number of electrical anodes 1 2 2 2 Observed pressure differential across the pressure switch Pa 165 165 165 165 Pressure differential to ope...

Page 106: ...5 T P overflow pressure kPa bar 700 7 T P overflow temperature C 97 Description Unit SGS 28 SGS 30 SGS 50 SGS 60 Load profile XXL XXL XXL XXL Energy Efficiency Class Energy Label A A A A Energy Efficiency 91 91 91 90 Daily Electricity Consumption kWh 0 251 0 254 0 255 0 256 Daily Fuel Consumption kWh GCV 26 501 26 552 26 562 26 632 Mixed Water 40 C V40 ltr 1255 Additional Load Profile 3XL 3XL Ener...

Page 107: ... 5 5 Solar limit adjustment range C 65 80 65 80 65 80 Solar limit default value C 65 65 65 Number of electrical anodes 2 2 2 Observed pressure differential across the pressure switch Pa 260 260 260 Pressure differential to open the pressure switch Pa 210 210 210 Heating time ΔT 45 C min 18 15 12 Electrical Electrical power consumption of the appliance W 95 145 240 Electrical power consumption of t...

Page 108: ... Load profile 3XL 3XL 3XL Energy Efficiency Class Energy Label Energy Efficiency 93 93 92 Daily Electricity Consumption kWh 0 281 0 290 0 301 Daily Fuel Consumption kWh GCV 49 811 49 922 50 060 Mixed Water 40 C V40 ltr 1368 Additional Load Profile Energy Efficiency Daily Electricity Consumption kWh Daily Fuel Consumption kWh GCV Mixed Water 40 C V40 ltr 108 Installation Maintenance and Service par...

Page 109: ...hot water outlet mm 1485 2015 2015 2015 Ny y position of hot water outlet mm 205 205 205 205 P Height of cleaning opening mm 265 270 270 270 R Height of drain valve connection mm 180 170 170 170 S Height of T P valve connection mm 995 1505 1505 1505 W Height of condensation drain mm 245 245 245 245 1 Cold water supply connection external R 1 1 2 R 1 1 2 R 1 1 2 R 1 1 2 2 Hot water outlet male R 1 ...

Page 110: ...Fig Dimensions SGS 28 30 50 60 110 Installation Maintenance and Service part ...

Page 111: ...ot water outlet mm 2060 2060 2060 Ny y position of hot water outlet mm 205 205 205 P Height of cleaning opening mm 290 290 290 R Height of drain valve connection mm 225 225 225 S Height of T P valve connection mm 1425 1425 1425 W Height of condensation drain mm 240 240 240 1 Cold water supply connection external R 1 1 2 R 1 1 2 R 1 1 2 2 Hot water outlet male R 1 1 2 R 1 1 2 R 1 1 2 3 Gas control ...

Page 112: ...Fig Dimensions SGS 80 100 120 112 Installation Maintenance and Service part ...

Page 113: ... temperature nominal load ºC 44 54 63 68 Gas category 3P G31 Diameter of the venturi restrictor mm 6 00 6 00 6 00 6 00 Nominal Load gross kW 31 5 32 6 51 1 62 0 Nominal output kW 31 0 32 7 50 3 60 4 Supply pressure mbar 37 50 37 50 37 50 37 50 Gas control valve pressure mbar 12 0 2 0 12 0 2 0 12 0 2 0 12 0 2 0 CO2 full load vol 10 0 1 0 10 0 1 0 10 0 1 0 10 0 1 0 O2 full load vol 5 7 1 8 5 7 1 8 5...

Page 114: ...41 9 172 9 211 1 Flue gas temperature nominal load ºC 52 55 60 Gas category 3P G31 Diameter of the venturi restrictor mm 6 60 6 60 6 60 Nominal Load gross kW 84 8 103 3 126 1 Nominal output kW 84 2 100 7 121 8 Supply pressure mbar 37 50 37 50 37 50 Gas control valve pressure mbar CO2 full load vol 9 6 1 0 9 6 1 0 9 6 1 0 O2 full load vol 6 3 1 8 6 3 1 8 6 3 1 8 Gas consumption kh h 6 1 7 4 9 0 NOx...

Page 115: ...ON OFF OFF 3 ON ºC ON OFF OFF 4 ON ºC ON OFF OFF 5 ON ºC ON OFF OFF 6 ON ºC ON OFF OFF 7 ON ºC ON OFF OFF 8 ON ºC ON OFF OFF 9 ON ºC ON OFF OFF 10 ON ºC ON OFF OFF 11 ON ºC ON OFF OFF 12 ON ºC ON OFF OFF 13 ON ºC ON OFF OFF 14 ON ºC ON OFF OFF 15 ON ºC ON OFF OFF 16 ON ºC ON OFF OFF 17 ON ºC ON OFF OFF 0311753_SGS_28 120_II_UKUK_V2 0 2017 05 03 115 ...

Page 116: ...18 ON ºC ON OFF OFF 19 ON ºC ON OFF OFF 20 ON ºC ON OFF OFF 21 ON ºC ON OFF OFF Example Period Day Time Tset Pump 1 ON MO 14 30 70 ºC ON OFF OFF MO 16 15 116 Installation Maintenance and Service part ...

Page 117: ... 6 12 11 16 15 14 13 19 18 17 20 24 21 22 23 J33 A R J38 J37 X X J34 J35 J39 J36 4 4 M X X 4 X 2 1 3 2 1 1 2 3 1 2 3 4 2 1 1 5 6 2 3 7 8 4 5 1 5 1 1 6 2 1 4 1 2 5 6 3 6 1 2 4 3 1 7 1 1 2 9 7 5 3 1 11 13 15 10 4 2 8 6 16 12 14 7 1 6 2 4 5 1 3 5 1 3 1 2 4 5 5 7 4 4 2 0 I 2 1 1 L N 3 2 1 X X X X 2 4 3 1 N F N L Primair N L L N Secundair 230VAC 50Hz J G H 3 1 2 4 1 2 3 4 3 1 4 2 4 2 5 1 1 3 5 2 3 3 1 ...

Page 118: ...nsformer A Earth K Double pole isolator JP3 Temperature sensor T2 connection N Neutral L Controller O I switch L Live input of controller M Display JP4 Dummy connection L1 Live input of isolating transformer primary side N Fan JP5 Temperature sensor T1 connection O Temperature sensor T2 bottom of tank L2 Live output of isolating transformer secondary side JP6 Selection resistor and pressure switch...

Page 119: ... sensor S2 tank J16 Connection of BUS link communication EE Combined Q T sensor incl temperature sensor S4 solar collector return Terminal strip connections J18 Connection of PWM signal solar heating system pump A Earth N Neutral FF Communication between the water heater controller and the solar heating system controller BUS link L Live input of controller F2 Fuse T 3 15A 250 V L3 Live input for t...

Page 120: ...ERVAL PROGRAM OVERVIEW SERVICE OPERATION EXTRA PERIOD FULL LOAD PARTIAL LOAD SETTINGS LANGUAGE ANTI LEGIONELLA DAY TIME SOLAR CONFIGURATION SPECIFICATIONS DRAIN BACK REGULATION INTERVAL TEST SOLAR PUMP IGNITION SPEED SOLAR LIMIT TEMEPRATURE SOLAR DIFFERENCE WORKING SPEED CONTRIBUTION Q T SENSOR TEMPERATURES HEATING CONFIGURATIONS HEATING SETPOINT HEATING CONNECTED 120 Installation Maintenance and ...

Page 121: ...12 8 Declaration of conformity 0311753_SGS_28 120_II_UKUK_V2 0 2017 05 03 121 ...

Page 122: ...ernment and local authority installation and building codes rules and regulations in force at the time of installation The water heater remains installed at the original site of installation The water heater is used exclusively with drinking water which at all times can freely circulate a separately installed heat exchanger is mandatory for heating saline water or corrosive water The tank is safeg...

Page 123: ... shall not be borne by A O Smith Article 7 Claims A claim on grounds of the specified warranty must be submitted to the dealer from whom the water heater was purchased or to another authorised dealer for A O Smith Water Products Company products Inspection of the water heater as referred to in Articles 1 and 2 shall take place in one of the laboratories of A O Smith Water Products Company Article ...

Page 124: ...124 Installation Maintenance and Service part ...

Page 125: ...Index A About this manual 7 Appendices 105 C Copyright 3 I Installation 53 P Preface 3 T Trademark 3 Troubleshooting 95 0311753_SGS_28 120_II_UKUK_V2 0 2017 05 03 125 ...

Page 126: ...126 Installation Maintenance and Service part ...

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