A.O. Smith SGS-28 Installation, User And Service Manual
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A.O. Smith SGS-28 Installation, User And Service Manual

Condensing high efficiency gas-solar water heater
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SGS
Condensing High Efficiency
Gas-Solar Water Heater
SGS - 28/30/50/60/80/100/120
Installation, User and Service
Manual
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Summary of Contents for A.O. Smith SGS-28

  • Page 1 Condensing High Efficiency Gas-Solar Water Heater SGS - 28/30/50/60/80/100/120 Installation, User and Service Manual Innovation has a name.
  • 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.

  • Page 3: Preface

    Nothing from this publication may be copied, reproduced and/or published by means of printing, photocopying or by whatsoever means, without the prior written approval of A.O. Smith Water Products Company. A.O. Smith Water Products Company reserves the right to modify specifications in this manual. Trademarks Brand names in this manual are registered trademarks of their respective owners.

  • Page 4: Regulations

    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.

  • Page 5: Contact Information

    Contact information If you have any comments or questions, please contact: A.O. Smith Water Products Company Adress: PO Box 70 5500 AB Veldhoven The Netherlands Telephone: 0870 - AOSMITH (free) 0870 - 267 64 84 General: +31 40 294 25 00...

  • Page 7: About This Manual

    About this manual Scope This manual gives information about safe and correct use of the water heater and how installation, maintenance and service activities have to be done correctly. You must obey the instructions in this manual. Caution Read this manual carefully before you start the water heater. It can cause personal injury and damage to the water heater when you do not read the manual and/or do not obey the instructions.

  • Page 8: Document Identification

    This manual contains the following text styles/symbols for situations that may endanger users/engineers, cause damage to equipment or need special attention: Note A note gives more information on a topic. 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.

  • Page 9: Table Of Contents

    Table of Contents Preface..................3 Copyright................3 Trademarks............... 3 Warranty................3 Liability................3 Compliance............... 3 Regulations............... 4 Contact information............5 About this manual............... 7 Scope................7 Target group..............7 Notation conventions............7 Document identification............8 User part..............13 Introduction................15 Safety..................17 Interface................... 19 Operator interface............
  • Page 10 Use.................... 25 Turn on the water heater........... 25 4.1.1 The appliance's heating cycle..........25 Turn off the water heater...........27 4.2.1 Turn off for a short period..........27 4.2.2 Isolate from the mains............27 4.2.3 Turn off for a long period........... 28 Main menu..............
  • Page 11 Conditions............... 53 7.2.1 Ambient conditions............53 7.2.2 Maximum floor load............53 7.2.3 Water composition............54 7.2.4 Working clearances............54 7.2.5 Storage tank working clearances........55 Installation diagram............56 Water connections............57 7.4.1 Unvented water connections..........57 7.4.2 Vented water connections..........58 Gas connection..............59 Solar heating system............
  • Page 12 9.2.4 Display the selected water heater........84 9.2.5 Setting the service interval..........85 9.2.6 Service mode..............85 9.2.7 Setting legionella prevention..........86 9.2.8 Solar heating system configuration........87 9.2.9 Setting the central heating configuration......89 Maintenance................91 10.1 Preparation..............91 10.2 Water-side maintenance............ 92 10.2.1 Descale the tank..............

  • Page 13: User Part

    User part 0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03...

  • Page 15: Introduction

    Introduction The SGS water heater stores and heats water for sanitary purposes. Cold water enters the bottom of the tank through 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.
  • Page 16 User part...

  • Page 17: Safety

    Safety A.O. Smith cannot be held responsible for damages or injuries leading back to: • Failure to follow the instructions provided in this manual. • Carelessness during use or maintenance of the water heater. Every user has to study the user part of this manual and has to follow the instructions in this part of the manual strictly.
  • Page 18 User part...

  • Page 19: Interface

    Interface Operator interface The operator interface is completely menu-driven, and comprises: • a 4-line display with 20 characters per line; • 6 buttons for controlling the water heater (below the display); • 6 graphical symbols (above the display); • a connector for a service PC; •...

  • Page 20: Control Switch

    Name Explanation Solar heating system Solar energy is heating the water Control switch The control switch of the controller turns the water heater ON and OFF. Note that in the OFF position the water heater remains electrically live, in order for the continuous pump to stay running.

  • Page 21: Pc Connection

    PC connection The PC connection is exclusively intended to enable technicians from A.O. Smith to read the status and history of the water heater. These details can be important for troubleshooting and/or resolving complaints. Status of the water heater During operation, the display shows the status of the water heater.

  • Page 22: Error Conditions

    3.6.1.4 PROG In this mode a preset week program is active, and the water heater responds continually to demand within the time periods set in the week program. There are two distinct situations possible in this mode: The current time falls within a set time period of the week program. The figure shows the display with the following information: line one: the text PROG;...

  • Page 23: Service Conditions

    3.6.3 Service conditions The figure shows the message SERVICE REQUIRED. If this message appears, the water heater needs a service and maintenance inspection. In this case, contact your service and maintenance engineer. Note Regular maintenance extends the service life of the water heater. Note The message SERVICE REQUIRED is based on the number of expired burning hours and the preset service interval.
  • Page 24 User part...

  • Page 25: Use

    Turn on the water heater Start the water heater as follows: Fill the water heater (see section 7.9.1). Open the manual gas valve. Switch on the power to the water heater using the isolator between the water heater and the power supply. Switch the controller ON by setting the control switch to position I.
  • Page 26 Once demand is registered, the fan is started to vent any gases that may be present. This phase is called pre-purge and lasts about 15 seconds. The icon is activated. The message PRE PURGE appears. During the pre-purge, the pressure switch closes. The icon is activated.

  • Page 27: Turn Off The Water Heater

    Following the post-purge, the fan stops and the pressure switch opens: The icons are dimmed. The message POST PURGE vanishes. With any subsequent heat demand, the heating cycle will resume from step 1. Turn off the water heater 4.2.1 Turn off for a short period To decommission the water heater for a short period, you must activate the frost protection.

  • Page 28: Turn Off For A Long Period

    Isolate the water heater from the power supply by setting the isolator between the water heater and the mains power supply to position 0. Note Setting the main switch between the water heater and the electricity mains to 0 will switch off the power supply to the potentiostat;...

  • Page 29: Switching To On Mode

    LANGUAGE: Using [ ] and/or [ ] to go to LANGUAGE Confirm with [ENTER]. After pressing [ENTER], you will have activated sub-menu LANGUAGE. 4.3.2 Switching to ON mode You can switch the water heater to ON mode from any operational mode, as follows: ]: ON | START OPERATION Confirm with [ENTER].

  • Page 30: Week Program

    4.3.4 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, then this is indicated on the display by the text PROG on the first line (see the figure). The second line shows the time of day, the day of the week and the temperature.
  • Page 31 The display shows the menu for the week program, see the 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 (P). Example As an example, we will set the switch-on time for Sunday to 08:15 hours, and the matching switch-off time to 12:45 hours.
  • Page 32 4.3.6.2 Week program: setting the switch-off time Use [ ] and [ ] to set the hours. In the example, this is 12. 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].

  • Page 33: Adding Times To A Week Program

    4.3.7 Adding times to a week program Call up the menu to INSERT switch-on and switch-off times into a week program as follows: ]: WEEK PROGRAM | PROGRAM OVERVIEW. Confirm with [ENTER]. The display shows the menu for the week program. The cursor points to the active period.

  • Page 34: Deleting Times From A Week Program

    4.3.8 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 water heater are programmed as in the figure. To delete a period, proceed as follows: ]: WEEK PROGRAM | PROGRAM OVERVIEW. Confirm with [ENTER].

  • Page 35: Extra Period

    The lines showing switch-on/off times are replaced by the text DELETE BLOCK?. See the figure. Confirm with [ENTER]. (or use [RESET] to cancel). The switching period has been deleted. You will return now to the week program menu. The cursor points to the first programmed period. Scroll with [ ] to START OPERATION.
  • Page 36 Setting the switch-on time Use [ ] and [ ] to set the day. In the example this is SU. Confirm with [ENTER]. The cursor moves to the hour digits, which will blink. Use [ ] and [ ] to set the switch-on hour to the desired value. In the example, this is 08.

  • Page 37: Settings

    The cursor moves to START. Confirm with [ENTER]. The extra period has been programmed. Note Once the extra period has completed running, the controller returns to the mode ON, OFF or WEEK PROGRAM. The following week, the extra period will NOT be automatically switched back on.

  • Page 38: Setting Day And Time

    4.3.10.2 Setting day and time To enter the time and day: Call up the menu for entering the day and time as follows: ]: SETTINGS. Confirm with [ENTER]. The display shows the menu for settings. Scroll with [ ] and [ ] to DAY/TIME. Confirm with [ENTER].
  • Page 39 4.3.10.3 Displaying water heater specifications Note This category is solely intended for the installation engineer and/or service and maintenance engineer. The corrected data is shown in the table of general and electrical data (see section 12.1). Call up the menu to display the water heater specifications as follows: ]: SETTINGS.
  • Page 40 User part...

  • Page 41: Installation, Maintenance And Service Part

    Installation, Maintenance and Service part 0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03...
  • Page 42 User part...

  • Page 43: Introduction

    Introduction About the water heater The SGS water heater is intended for heating water for sanitary purposes. The SGS is a condensing gas–fired storage water heater with a fan in the air intake. The flue gasses transfer their heat to the water through an efficient heat exchanger. The water heater has a concentric venting connector and can function as an open or as a room- sealed water heater.
  • Page 44 transferred to the cooler water, thereby increasing the performance of the unit. The condensate yielded by this process is discharged via the condens trap (23). Heat losses are prevented by the insulating layer (24) in both the storage tank and the water heater itself.

  • Page 45: Operating Cycle

    Operating cycle The water temperature (T ) at the top of the water heater is used to control when the gas burner is started and stopped. The temperature changes in the water heater are used for switching the solar heating system on and off (using T and S ).
  • Page 46 Note can rise above T . However, this is only possible if T is increased via the solar limit service menu. Installation, Maintenance and Service part...

  • Page 47: Safety

    Safety Safety instructions For safety instructions about the use of the water heater, refer to Safety (see section 2) in the User part of this manual. Warning Installation, maintenance and service must be carried out by a qualified engineer in compliance with the general and local regulations imposed by the gas, water and power supply companies and the fire brigade.

  • Page 48: Instructions On The Water Heater

    Caution The anode protection remains active when the water heater is in OFF mode and the control switch is set to 0. Note Any leakage from the tank and/or connections can cause damage to the immediate environment or floors below the level of the boiler room. Install the water heater above a waste water drain or in a suitable metal leak tray.

  • Page 49: Safety Devices

    Safety devices 6.3.1 Protection for the water heater 6.3.1.1 Water temperature protection Using temperature sensors T (7) and T (13), the controller monitors three temperatures that are important for safety. The table explains the functioning of the temperature sensors. Safety Description Anti-frost The frost protection cuts in.

  • Page 50: Safety Of The Installation

    6.3.2.3 T&P valve A T&P valve is only mandatory in unvented installations. However, A.O. Smith also recommends the use of a T&P valve in vented installations. A T&P (Temperature and Pressure Relief) valve monitors the pressure in the tank and the water temperature at the top of the tank.

  • Page 51: Protection For The Solar Heating System

    6.3.3 Protection for the solar heating system 6.3.3.1 Drain-back tank The solar heating system may optionally be equipped with a drain-back tank. The tank fills itself with the heating fluid when there is no heat demand. This avoids overheating of the solar heating system.

  • Page 52: Environmental Aspects

    Environmental aspects 6.4.1 Recycling The packaging material is environmentally friendly, recyclable and relatively easy to discard. 6.4.2 Disposal Old end-of-life appliances contain materials that need to be recycled. When you discard devices at the end of their service life, you must obey local legislation related to waste disposal.

  • Page 53: Installation

    For more safety instructions, refer to Safety instructions (see section 6.1). Packaging A.O. Smith recommends to unpack the water heater at or near its intended location. Remove the packaging material carefully to prevent damage to the water heater. Conditions The water heater is suitable for room-sealed and for open combustion: •...

  • Page 54: Water Composition

    Bear in mind that the total weight of the installation always comprises a water heater complete with storage tank (completely filled with water). This maximum floor load may be between 400 and 4500 kg. This depends on the type of storage tank. 7.2.3 Water composition The water must comply with the regulations for drinking water for human consumption.

  • Page 55: Storage Tank Working Clearances

    7.2.5 Storage tank working clearances For access to the storage tank, it is recommended that the following clearances are observed: • All sides of the storage tank: 50 cm. • Above 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.

  • Page 56: Installation Diagram

    Installation diagram Fig. Installation diagram U N V E N T E D V E N T E D IM D -07 87 R 0 Pressure reducing valve Manual gas valve Float switch Circulation pipe (mandatory) (mandatory) Pressure valve Gas supply (mandatory) Inlet combination Service stop valve...

  • Page 57: Water Connections

    Caution The installation diagram shows a pump station with an integrated non-return valve. This type of pump unit may only be used with closed systems. In systems with drain-back, installation of a pump unit with non-return valve is prohibited. There are special pump units for these systems.

  • Page 58: Vented Water Connections

    7.4.1.4 Condensation drain Fit a sloping waste water pipe to the condens trap (13) for condensation drainage and connect this via an open connection to the waste water discharge. Caution If the condensation drain is not fitted to the waste water discharge using an open connection, this can cause faults.

  • Page 59: Gas Connection

    Gas connection Caution Make sure that the gas supply pipe has the correct diameter and length to supply sufficient capacity to the water heater. Caution Make sure that the gas supply pipe is clean. Contamination in the pipe can cause damage to the gas control valve, during operation.
  • Page 60 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.

  • Page 61: C13/C33 Concentric Systems

    Diameter flue gas outlet 100 mm 130 mm Diameter air inlet 150 mm 200 mm Description parts A.O. Smith Part A.O. Smith Part number number Wall terminal set 0302504 0311465 A wall terminal (1), a 500 mm concentric pipe and a 90° bend...

  • Page 62: C13/C33 Parallel Systems

    Material flue gas outlet Thick walled aluminum Thick walled aluminum Material air inlet Diameter flue gas outlet +0,6 +0,6 -0,6 -0,6 Diameter air inlet Description parts A.O. Smith Part A.O. Smith Part number number Wall terminal 0302505 0302313 Installation, Maintenance and Service part...
  • Page 63 Roof terminal 0311463 0306390 Adapter box concentric to 0307142 0306801 parallel - terminal side Adapter box concentric to 0304204 0309605 parallel - water heater side Parallel pipe 500 mm 0307160 0306804 Parallel pipe 1000 mm 0307161 0306802 Parallel bend 45° 0310197 0308082 Parallel bend 90°...

  • Page 64: C43/C53/C63 Systems

    The flue gas terminal must comply to the EN 1856-1 requirements. The maximum allowable recirculation rate is 10% under wind conditions. Contact A.O. Smith for more information and/or part numbers of the C43, C53 and C63 venting systems. Installation, Maintenance and Service part...

  • Page 65: Electrical Connections

    Diameter air inlet 150 mm 200 mm Refer to C13/C33 concentric systems for the A.O. Smith part numbers. The same parts can be used for the C43, C53 and C63 concentric systems. Parallel and non-concentric systems Refer to the table for the correct pipe dimensions of the C43, C53 and C63 parallel systems.

  • Page 66: Preparation

    Fig. Terminal block A. Screws B. Cover C. Terminal block 7.8.1 Preparation In preparation, you must first remove the two covers, and the cover of the electrical section. Undo the screws of the covers. Carefully remove the covers from the water heater. The electrical section is now visible.

  • Page 67: Optional Electrical Connections

    7.8.3.1 Isolating transformer For more information about an isolating transformer, or to order an isolating transformer, please contact A.O. Smith. An isolating transformer should be used if there is a case of 'floating neutral'. Note The total power consumed by the appliance goes via the isolating transformer.

  • Page 68: Electrical Connection Of The Solar Heating System

    7.8.3.5 Communication cable to solar heating system You must connect a communication cable between the controllers of the water heater and the solar heating system. Connect the cables (X5 and X6) to terminals 23 and 24 as shown in the table (see section 7.8).
  • Page 69 Fit the cables in the strain relief. Continue (see section 7.8.4.4). 7.8.4.4 Connecting solar collector Note This sensor must be mounted in the solar collector;refer to the solar collector installation manual. Connect the sensor (S1) to the water heater as follows: Connect the sensor to terminal 2 and 4 of J13.

  • Page 70: Commissioning

    7.8.4.8 Connecting Q/T sensor Note You can optionally add a Q/T sensor to the installation. This enables you to calculate the energy contribution of the system. For more information or to order the Q/T sensor, please contact your supplier. Connect the 5V to J12-1. Connect sensor S4 to J12-2.
  • Page 71 The water heater is now under water supply pressure. There should now be no water coming out of the inlet combination expansion valve or (if used) out of the T&P valve (3). If there is, the cause might be: The water supply pressure is greater than the specified value (see section 12.1).

  • Page 72: Procedure For Checking The Supply Pressure

    Use the service menu to switch the pump on (see section 9.2.8.2). Note To ensure that the solar heating system is properly filled, the pump in the solar heating system can be switched on for 2 minutes using the service menu. Repeat steps 6 through 9 until glycol runs out of the air bleed (26).
  • Page 73 IMD-1097a R0 Open the gas supply and vent the gas supply line via the test nipple. Connect a pressure gauge to the test nipple as soon as gas starts to flow from it. 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.

  • Page 74: Procedure For Checking The Gas Control Valve Pressure

    If there is nothing else you need to check or adjust, you can put the covers back on the appliance. 7.9.3 Procedure for checking the gas control valve pressure The procedure for checking the gas control valve pressure is only applicable to appliances that have a pressure-reducing valve.

  • Page 75: Co 2 Adjustment

    Fig. Gas control valve pressure adjustment IMD-1096b R0 7.9.4 adjustment To check the CO value under full load and partial load and to adjust it if necessary, proceed as follows: Isolate the appliance from the power supply (see section 4.2.2). Carefully remove the covers from the appliance.
  • Page 76 Fig. CO adjustment (full load) IMD-1095b R0 Note Turning to the left (anticlockwise) means more gas (higher CO level) and turning to the right (clockwise) means less gas (lower CO level). Note Note After conversion, you must check that the gas control valve is gastight. If you have increased T , set it back to the original value using [ ].

  • Page 77: Switching Pressure Measurement

    Fig. SGS 28 to 60 - CO adjustment (partial load) IMD-1095c R0 Fig. SGS 80 to 120 - CO adjustment (partial load) IMD-1097b R0 Note Turning to the left (anticlockwise) means more less (lower CO level) and turning to the right (clockwise) means more gas (higher CO level).

  • Page 78: Turn On The Water Heater

    Start the appliance (see section 4.1). The appliance will now run the heating cycle (see section 4.1.1). Read the pressure from the meter at the moment when the appliance switches from PRE PURGE to PRESSURE SWITCH. At this point, the appliance's display will show: Check whether the measured value matches the value from the table (see section 12.1).

  • Page 79: Draining Vented Installations

    Open the drain valve (9). 7.10.2.2 Draining vented 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 OFF. Confirm OFF with [ENTER]. Wait until the fan has stopped.
  • Page 80 Remove the hose. Note Dispose of the drained glycol in an environment-friendly manner, and according to local regulations. Installation, Maintenance and Service part...

  • Page 81: Conversion Of Gas Type

    Conversion of gas type Caution Conversion of the water heater may only be carried out by a qualified person. Use a special conversion kit to converse the water heater when: • The water heater has to operate on a different family of gases (liquid petroleum gas or natural gas).
  • Page 82 Installation, Maintenance and Service part...

  • Page 83: Settings

    Settings Operator interface The operator interface is completely menu-driven and enables the user to change settings and to verify the status and history of the water heater. For more information about how to use the operator interface, refer to Operator interface (see section 3).

  • Page 84: Display The Error History

    Please refer to the table for the regulation interval and settings for each water heater. 9.2.2 Display the error history Display the error history as follows: • ]: ERROR HISTORY The controller will display an overview of "Blocking errors" and "Lock out errors". In both cases, note that the controller reserves 15 lines for the last 15 error messages.

  • Page 85: Setting The Service Interval

    9.2.5 Setting the service interval The service interval is a feature of the controller to help the service and maintenance engineer set the frequency of maintenance. The service interval is determined by the number of months that the appliance has been running.

  • Page 86: Setting Legionella Prevention

    To create a heat demand, you can temporarily raise the set point using [ ] to e.g. 70ºC. Confirm with .[ENTER]. After adjusting for the CO value (see section 7.9.4), you must use [ ] to restore the set point to its original value. Press [ ] twice to return to the MENU menu via the SERVICE OPERATION menu.

  • Page 87: Solar Heating System Configuration

    • Now set the day and time the same way as described for setting an extra period in the week menu (see section 4.3.9). In this case however, the pump will be automatically started. • Select START to start. 9.2.8 Solar heating system configuration Use the solar heating system settings menu to reach the menus shown here: 9.2.8.1...
  • Page 88 Please refer to the table for the adjustment range and default value for each appliance. 9.2.8.4 Setting the solar difference The solar difference is a value that influences how the operating cycle of the water heater proceeds. Call up the menu as follows: •...

  • Page 89: Setting The Central Heating Configuration

    9.2.9 Setting the central 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. 0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03...
  • Page 90 Installation, Maintenance and Service part...

  • Page 91: Maintenance

    On the operator interface, the maintenance interval can be set as a reminder. The display shows SERVICE REQUIRED when the pre-set interval has elapsed. To determine the correct interval, A.O. Smith recommends to do a system check on both the water and the gas side, three months after installation.

  • Page 92: Water-Side Maintenance

    The display will now show INTERNAL CHECK for about 10 seconds, and will then go to the main menu. Activate ON mode by going through the following steps: Press once on the blue arrow [ ] to position the cursor beside ON, then press [ENTER].

  • Page 93: Clean The Condensate Drain

    Fig. Cleaning opening IMD-0080 R1 Remove the cover plate (1) on the outer jacket (see the figure). Undo the bolts. Remove the cover and the gasket. Inspect the tank and remove the loose scale deposits and contamination. If the scale cannot be removed by hand, descale the water heater with a descaling agent.

  • Page 94: Solar Collector Maintenance

    10.4 Solar collector maintenance See installation or users' manual for the solar collector. If this topic is not covered in the manual, then contact the supplier of the collectors. 10.5 Finalization To finalize the maintenance, carry out the following steps: Fill the water heater (see section 7.9.1).

  • Page 95: Troubleshooting

    Troubleshooting 11.1 Errors and warnings The water heater can have three different kinds of errors and warnings: • General errors, which are not displayed • Displayed errors, which are divided in two different groups: Lock out errors: when the cause is removed, you can reset the error to resume operation.

  • Page 96: General Errors

    11.1.1 General errors Note For the coding of the connections, refer to the Electrical wiring diagram. Indication Cause Measure Gas smell There is a gas leak • Close the mains gas valve at once. • Do not operate any switches. •...

  • Page 97: Displayed Errors

    Indication Cause Measure Insufficient or no hot The water heater is off. Turn on the water heater (see section 4.1). water There is no supply voltage. Make sure that: • the control switch is set to I. • the isolator is in ON position. •...
  • Page 98 Code and description Cause Measure S06 (blocking error) Sensor is not (correctly) connected Connect the sensor lead to J14 (ports 1 and 3) of the solar controller Open circuit from temperature sensor S Damaged cable and/or defective sensor Replace the cable and/or sensor the top of the storage tank.
  • Page 99 Code and description Cause Measure F02 (lock out error) Defective motor and/or rotor. • Check the motor and rotor • Replace the fan if the motor or rotor is Fan fails to run at correct defective. speed. • Reset controller Damaged wiring •...
  • Page 100 Code and description Cause Measure F04 (lock out error) No gas • Open the main gas supply valve and/or the manual gas supply valve before the Three unsuccessful gas control valve ignition attempts. • Check supply pressure to the gas control valve •...
  • Page 101 Code and description Cause Measure F11 (blocking error) Defective gas control valves See F07. Flame detection with closed gas control valve. F18 (blocking error) No power supply at solar controller • Check that there is power to the solar heating system controller Communication error •...

  • Page 102: Warnings

    Code and description Cause Measure E03 (lock-out error) The two temperature sensors in the tank Check sensor position and wiring. detect a difference of > 10°C over a Reset the controller if necessary. Replace Error in temperature period of at least 60 seconds. the sensor if the error persists.
  • Page 103 Indication Cause Remark Collector temperature too Temperature S is greater than You can let the message disappear high automatically by allowing the heating collector max fluid to cool down. You can also manually eliminate the message by pressing the RESET and ENTER buttons simultaneously.
  • Page 104 Installation, Maintenance and Service part...

  • Page 105: Appendices

    Appendices 12.1 Technical details Description Unit SGS 28 SGS 30 SGS 50 SGS 60 General Contents litres Empty Weight Maximum floor load Maximum operating pressure kPa (bar) 800 (8) 800 (8) 800 (8) 800 (8) (vented) Maximum operating pressure kPa (bar) 550 (5.5) 550 (5.5) 550 (5.5)
  • Page 106 Description Unit SGS 28 SGS 30 SGS 50 SGS 60 Supply voltage volts (-15%, +10% VAC) Mains frequency (± 1Hz) IP class IP 20 IP 20 IP 20 IP 20 Description Unit Value Maximum mains pressure of kPa (bar) 800 (8) cold water supply (vented) Maximum mains pressure of kPa (bar)
  • Page 107 Description Unit SGS 80 SGS 100 SGS 120 General Contents litres Empty Weight Maximum floor load Maximum operating pressure kPa (bar) 800 (8) 800 (8) 800 (8) (vented) Maximum operating pressure kPa (bar) 550 (5.5) 550 (5.5) 550 (5.5) (unvented) Control thermostat - °C 40...80...
  • Page 108 Description Unit Value Maximum mains pressure of kPa (bar) 500 (5) the protected cold supply setup T&P overflow pressure kPa (bar) 700 (7) T&P overflow temperature °C Description Unit SGS 80 SGS 100 SGS 120 Load profile Energy Efficiency Class (Energy Label) Energy Efficiency Daily Electricity Consumption...

  • Page 109: Dimensions

    12.2 Dimensions Size Description Unit SGS 28 SGS 30 SGS 50 SGS 60 Overall height 1485 2015 2015 2015 Position on pallet Appliance diameter Depth Width Diameter of flue gas 100/150 100/150 100/150 100/150 discharge Height of flue gas 1380 1980 1980 1980...
  • Page 110 Fig. Dimensions SGS 28, 30, 50, 60 Installation, Maintenance and Service part...
  • Page 111 Size Description Unit SGS 80 SGS 100 SGS 120 Overall height 2060 2060 2060 Position on pallet Appliance diameter Depth 1000 1000 1000 Width Diameter of flue gas 130/200 130/200 130/200 discharge Height of flue gas 1995 1995 1995 outlet/air supply x position flue gas outlet x position flue gas...
  • Page 112 Fig. Dimensions SGS 80, 100, 120 Installation, Maintenance and Service part...

  • Page 113: Gas Details

    12.3 Gas details Description Unit SGS 28 SGS 30 SGS 50 SGS 60 Gas category 2H: G20 Diameter of the venturi restrictor Nominal Load (gross) 32.2 33.3 52.2 63.3 Nominal output 31.0 32.7 50.3 60.4 Supply pressure mbar (full load) vol% 9.0 ±...
  • Page 114 Description Unit SGS 80 SGS 100 SGS 120 Gas category 2H: G20 Diameter of the venturi 8.60 8.60 8.60 restrictor Nominal Load (gross) 86.6 105.5 128.8 Nominal output 84.2 100.7 121.8 Supply pressure mbar (full load) vol% 8.9 ± 1.0 8.9 ±...

  • Page 115: Week Program Card

    12.4 Week program card You can cut the week program card out and keep it near the water heater. Period Time Pump ... ºC ON / OFF ... ºC ON / OFF ... ºC ON / OFF ... ºC ON / OFF ...
  • Page 116 ... ºC ON / OFF ... ºC ON / OFF ... ºC ON / OFF ... ºC ON / OFF Example Period Time Pump 14:30 70 ºC ON / OFF 16:15 Installation, Maintenance and Service part...

  • Page 117: Electrical Wiring Diagram

    12.5 Electrical wiring diagram X J2 JP11 JP12 21 22 23 Primair Secundair 230VAC 50Hz 0309 687a R0 230VAC 50Hz 0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03...
  • Page 118 Cable colors: Components: Controller connections: Brown Control Power connection for controller Blue Flame probe Extra error signal connection Green Hot surface igniter Gas control valve connection Black Gas control valve Program-controlled pump connection White Burner earth connection Grey/Beige Extra ON mode switch Power connection for the fan Green Program-controlled pump...

  • Page 119: Electrical Wiring Diagram Solar Heating System

    12.6 Electrical wiring diagram solar heating system Cable colors: Components: Controller connections: Brown Control Connection of combined Q/ T sensor (1-2-3-4) Blue Solar heating system pump [VAC] (modulating) (230 VAC) Green Connection of temperature sensor (2-4) Black Solar heating system pump [PWM] (modulating) (PWM-signal) White...

  • Page 120: Menu Structure

    12.7 Menu structure CONTROL SERVICE MAIN MENU PROGRAM HYSTERESE HYSTERESE DOWN HISTORY START OPERATION OF ERRORS CHANGE SETPOINT APPLIANCE HISTORY WEEK- PROGRAM SELECT APPLIANCE START OPERATION SERVICE INTERVAL PROGRAM OVERVIEW SERVICE OPERATION EXTRA PERIOD FULL LOAD SETTINGS PARTIAL LOAD LANGUAGE ANTI LEGIONELLA DAY/TIME SOLAR...

  • Page 121: Declaration Of Conformity

    12.8 Declaration of conformity 0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03...

  • Page 122: Warranty

    Article 2: Tank warranty If, after inspection and at the sole discretion of A.O. Smith, the glass-lined steel tank of a water heater supplied by A.O. Smith proves within 3 years of the original installation date to be leaking due to rust or corrosion occurring on the water side, then A.O.
  • Page 123 (assemblies or parts of) water heaters supplied for replacement, other than the warranty expressly set out in these Articles. Under the terms of the supplied warranty, A.O. Smith is not liable for damage to persons or property caused by (assemblies or parts, or the glass-lined steel tank of) a (replacement) water heater that it has supplied.
  • Page 124 Installation, Maintenance and Service part...

  • Page 125: Index

    Index About this manual....... 7 Appendices........105 Copyright........... 3 Installation........53 Preface..........3 Trademark......... 3 Troubleshooting........ 95 0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03...
  • Page 126 Installation, Maintenance and Service part...

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