Strebel S-AF Range Installation
Contents
1. NOTE THE BOILER PUMP IS NOT NORMALLY THE MAIN HEATING CIRCULATION PUMP The electrical connections to the 5 within the boiler casing Connections must only be made using appropriate diameter multi core flexible cables The outside sensor normally for a stand alone Boiler is not used with 0 to 10 volt control Strebel always recommend using relays for Pumps Terminals 3 amp 4 must be used for the Boiler pump as self checking is built into the advanced control 3 amp 4 can energise relays in the main panel if required e The Boiler pump is connected to the Boiler by others to suit site conditions using relays and local isolation where required Connector Block The stated items may be attached using the connections above use relays not supplied for a 3 PH Boiler pump Please pay attention to the Earthing of all components Important Interruption of the mains supply for On Off control must not be used Safe ty devices volt free can be series connected in the control circuit 1 amp 2 but not when using 0 to 10 volt control where 0 volts less than 3volts stops the Boiler NOTE Terminals 1 amp 2 230v are for on off control and safety devices such as low amp high water pressure switches Terminals 1 amp 2 have no effect when using O to 10 volt control When using 0 to 10 volt control 0 volts less than 3 volts stops the boiler therefore safety devices should signal 0 v2. HEATING TECHNOLOGY 0 to 10 VOLT CONTROL The boiler can be set for operation utilising a 0 to 10V signal by others from an external control The 0 to 10V control function is managed through parameter 18 See parameter setting page 58 With active function parameter 18 7 the temperature demand and temperature set point are directly con trolled by the 0 to 10 volt input With a voltage higher than 3V the heat demand is activated and the temperature set point is calculated as the input voltage varies between 3v to 10V the temperature variation corresponds to what is set in the con trol as the minimum or maximum The heat demand is deactivated with a voltage less than 3 Vdc The solid line in the graph below shows the relationship of gt 3v to 10v with 35C to 85C temperature range If Parameter 7 is changed from the default 85c maximum boiler temperature to for example 60c the dashed line shown in the graph below illustrates the resulting temperature changes 90 80 70 30 20 BOILER TEMPERATURE 5 10 0 1 2 3 5 6 7 8 9 10 11 VOLTAGE In this mode all Boiler control functions such as domestic hot water production climatic regula tion etc are managed by the external 0 to 10v control Therefore in order to avoid any problems of overlapping of operating periods the boiler must be in mode see page 39 when utilising 0 to 10 volt control of the Boiler To set the programme for 0 to
3. Page 57 15 HEATING TECHNOLOGY CONTROL PARAMETER SETTING PROCEDURE PROGRAMMING PLEASE SEE THE PARAMETER A a LIST ON THE NEXT PAGE E dM it To enter the parameter area press B mv i for 4 seconds ax 000 JN MN o To enter the adjustable parameter area a a og OG Press 9 together gt E DM n i 101 me Lf To scroll through the parameters a 11 28 Press either E ww Lj Y Or r un FS VY OK To change the parameter setting Press either 17 a LJ 2 NN HM l H P 16 OW To input the setti o input the setting press 0 1 O a liil 2 0 21 7g 2 ON To exit the programme press a JL J 18 i 6 v 17 12 Power down the Boiler to activate the ii DAY 3 OK new settings _ gt _ a WARNING The parameters COMFR ECONM and SHOWR are not active and haven t any influence on the oper ation of the Boiler regardless of the value displayed set Page 58 15 HEATING TECHNOLOGY PARAMETERS Parameter Value Number Power down the boiler to activate parameter adjustments Range These parameters are typical of each model of Boiler see Check of initial parameters change of gas on page Maximum Boiler temperature 45 85
4. _ Wl 2 201 21222 _ _ gt A ll 120 110 50 40 30 20 10 FLOW RATE LEE wo Water flow rate AT 10 degrees 12 90 17 20 20 64 24 08 WARNING Non compliance with the water flow rates recommended may cause malfunctioning of the Boiler Upon commissioning check the rotation of the pump shaft DO NOT operate the pump without water Replacement pumps must have an amperage below the fuse installed in the control board 3 15 Page 20 15 HEATING TECHNOLOGY LOW LOSS HEADERS Low Loss Header Low Loss Headers or Strebel Boiler Guards 19 MUST be used page 25differs with the S AF Boiler Range Low Loss Header details are below Strebel Boiler Guard details available from Strebel Itd Floor standing Boilers pipe connection positions shown for ease of illustration Connections are at the rear Please check the quotation for items that will be supplied Strebel can supply most items shown at extra cost if applicable Note NRV s should be used supplied by others Pumps are required for the system side LOW LOSS HEADER DOC Strainer Interlock with boiler Pressurisation Unit With High amp Low Pressure Switches Low Loss Header amp Flow Return sizes Legend H1 System Flow amp Return Dimension AAV H2 Flow amp Return Header Dimension boiler side
5. K 4 Page 54 STREBEL HEATING TECHNOLOGY fi STREBEL HEATING TECHNOLOGY SETTING THE INBUILT CLOCK OPERATING PERIODS To modify the shutdown time of a the 1 operating period press either shaded button v 1 D 4014 B P 9 12 r Bn OK l validate the above then se lect the 274 operating i 3 Press the shaded button v Ul J TA TK 4 modify the heating time of the 274 operating period Press the either shaded button TO memorize the above then select the shutdown time of the 274 operating period Press the shaded button OK 1 v Page 55 STREBEL HEATING TECHNOLOGY SETTING THE INBUILT CLOCK OPERATING PERIODS To modify the shutdown time 27 x of the 2 operating period Press either shaded button 7 gt gt s 4 454 01 RR EB E DAY 1 memorize the above then s a select the shutdown time of e the 3 operating period f M Press the shaded button J Y Od z v UJI J T Jy v 11 AWAY 2 15 9 DAY B OK Continue in this manner until the end of the first day group of days is programmed For example if only thr
6. Boiler Tem K 1 5 90 K 6 _ 4 _ K23 2 15 140 15 255 15 218 PM15 200 15 182 07 85 80 C 70 C 1 60 C PM15 90 50 C 30 C 25 C 20 C 15 C 10 C 15 C 20 C 25 C 21 Procedure to enable the boiler operation with an external sensor variable temperature and night set back if required it is necessary to change parameters See page 58 External Temperature Set parameter 15 by choosing a curve with a suitable coefficient K see the graph above Set parame ter 23 Night function at value e g 10 C The parameter 23 reduces the set temperature calculat ed by the boiler according to the curve K chosen and the degrees set in this parameter The night reduction is activated by opening the contact TA 1 and 2 or selecting the operating period on the boiler panel If necessary set parameter 7 by choosing the maximum temperature of the boiler regardless of the temperature calculated If necessary set parameter 27 by choosing the minimum temperature of the boiler regardless of the temperature calculated If the boiler is in night reduction and the outside sensor calculates a temperature lower than parameter 27 the boiler is switched off If the boiler is in comfort normal Heating mode the temperature maintained becomes the tempera ture set by parameter 27 The boiler stays switched on until parameter 21 intervenes summer to win ter outside temperature If neces
7. 8 Activation of the chimneysweep function Pos 1 The Boiler lights up normally and reaches the minimum out 107 put Pos 7 The Boiler lights up normally and reaches the maximum out only put Heating re lighting timing AFCT Pos 0 255 0 510 sec 0 255 Heating post circulation timing Pos 0255 0 255 sec 0 255 Maximum heating and domestic hot water output Pos 0255 0 100 anes Pump mode Pos 1 Calorifier pump runs on demand TB 7 amp 8 calling if pro gramed see page 29 Boiler pump runs on demand of TA terminals 1 and 2 calling or 0 to 10v at gt 3 volts Boiler lights up on demand of TB or TA I I UJ N O Pos 4 Calorifier pump ON on demand of TB Boiler pump always ON at the end of the domestic hot water pro duction Boiler lit up on demand of TB or TA Pos 7 Calorifier pump ON on demand of TB Boiler pump ON on demand of TB or TA Boiler lit up on demand of TB or TA Lighting output Pos 0 255 0 100 0 255 2290 Setting of the coefficient K of the climatic curve 0 255 PNOTUSED PNOTUSED Input 0 to10V Control 107 1 Not active input 511 1 7 Active 0 to 10 Control 19 NOT USED 20 NOT USED 21 External temperature of automatic change summer winter Domestic hot water output reduction Pos 100 max 50 50 peau Night reduction _ 040 0o Minimum Boiler temperature 25 45 Page 59 14 15 16 7 1 N
8. m 0011 21 02 FBoerge 1 9 835 06 cs3 Min gas consumption G20 G31 12222221 ee MEM Flue temperature 80 60 max 65 70 12 Flue temperature 809 609 min 60 65 EE NEN Fie temperature 507305 mawmin 5 3 i a MEN Electrical Data 9 15 Imoedodegee ____ _____ _ _ Be 770 Maximum heating pressure Maximum operating temperature 9 1 _____ xs me emere E E mL Ex ms h Page 9 N 5 STREBEL HEATING TECHNOLOGY TECHNICAL DATA Description S RESIDUAL FAN PRESSURE For Boilers using individual flues not common flues it is possible to utilise the Boiler s fan pressure to overcome the resistance of longer flue runs and smaller diameter flues in this case the flue could be pressure condition The air supply and the flue exhaust must be in an equal pres sure area IE same wall Looking at the table below a 115 Kw Boiler could have either A 28 mts of 150mm flue exhaust and take air from the Boiler room B 14 mts of 150mm flue and 14 mts of 100mm ducted air intake 90 amp 45 degree bends are equivalent to 1 5 mts of flue See flue and air connection sizes on page 13 See Flue information on pages 27 TO 30 Suction Ducted Flue Suction Du
9. to 10 volt control See page 51 and 52 for program ming 0 to 10 volt control NOTE When using 0 to 10 Volt control terminals 1 and 2 have no effect on the Boiler operation therefore no link would be required be tween terminals 1 and 2 when using O to 10 volt control thus a hom voltage above 3 volts would be needed on terminals 13 and 14 for the Boiler to start firing others Press the shaded button in each case below 11111 Selecting is for a stand alone Boiler using the inbuilt Boiler controls for Heating amp Hot Water 17 ov 11 a Selecting TW mode is for external control of the Boiler using terminals 1 amp 2 TA or 0 to 10volt control when programmed 0 to 10 volt see page 51 Page 45 15 HEATING TECHNOLOGY The Boiler will carry out the light up phases and will operate until the set boiler temperature is reached e g 72 C We suggest reducing the temperature value as follows to speed up the off test To display the set value press either shaded button To modify the value to a lower temperature e g 53 C to test the Boiler going off hold the shaded button in The final set temperature can be Increased when required by using the button A 15 HEATING TECHNOLOGY ERROR SCREEN AND RE SETS In the case of incorrect light up or malfunctioning an error code 15 displayed For example Blockage sometim
10. Guard see page 19 Check that the Hydraulic system is installed correctly and is to current regulations If the system is 1 Old and has leaks resulting in poor water quality 2 Unable to handle 1 5 bar 3 Utilising plastic material for the flow and return from the radiators or under floor heating and is not oxygen diffusion proof to DIN standard 4726 4729 a separation between the central heating water of the boiler and the system will be required using a plate heat see Illustrations on page 25 amp 26 exchanger This will prevent contamina tion of the boiler heat exchanger with magnetite dirt etc In the instances 1 2 amp 3 failure to provide such separation could void the warranty e essential to prevent possible air intake and water leakage of the central heating system Fresh oxygenated water could damage the heating system and the heat exchanger of the boiler and should therefore be prevented e Check that the electrical system is carried out by qualified engineers in accordance with current regulations e Condensate and pressure relief valve drainage notes see notes on page 19 e Power supply preferably the electrical isolator should be positioned near the boiler The Boiler pump is fitted on site by others to suit site conditions The pump should have local isolation by others and connected to the Boiler terminal strip preferably via a relay by others see page 31 Confirm that the electrical system is carried out by q
11. Lad b gt 4 i P 4 gt A a 2 NV 2 M To set the current time press E NM J 1 2 u E either button which now sets 7 A the minutes v it 231 OK Page 42 15 HEATING TECHNOLOGY To validate the time set memorize it and then set the day press OK n DA Y 3 E gt 4 Co 16 9 To select the day of the week Press either button i eges M gt gt a Ai v ax DAY 3 OK 1 Monday 2 Tuesday 3 Wednesday 4 Thursday 1 ey 5 Friday 6 Saturday 7 Sunday To validate the day of the week set 229 and memorize it press 11 1 ron OK u E IE To leave the programming mode press b pem mv z E 11 WARNING The change from daylight saving time to summer time and vice versa is not managed automatically by the Boiler It is necessary to make the change manually Page 43 15 HEATING TECHNOLOGY SETTING IMPORTANT INITIAL PARAMETERS Checking of parameters relating to Gas Alarm signal Calorifier The parameters 1 to are set in accordance with the table below Check all parameters before commissioning CHECK THE PARAMETERS BELOW BEFORE STARTING COMMISSIONING SEE PAGE 58 FOR TH
12. OR REPLACING AN EXISTING BOILER Select the position for the Boiler Select a position in the building with adequate access to the front and side of the boiler for future maintenance and servicing mounting on a non combustible floor On every side of the boiler at least 50cm of clearance should be applied to walls or wall units 50 cm above the top side of the boiler CONSIDER THE FOLLOWING Determine the positions for the flow and return The Boiler is Heavy see table on page 11 To avoid injury consider the weight of the Boiler The Boiler must be level The following should be considered e Flue System Confirm that the flue system see pages 27 to 30 is suitable for the new con densation Boiler designed and built in accordance with the regulations as straight as possible but sloping to drains room sealed insulated without obstructions or narrowing and fitted with connec tion drains for the condensate e Gas pipe connections Confirm that the gas supply pipework is in accordance with the specific regulations e Air supply system and connections Confirm the ventilation is to regulations e Flow and return pipe connections Check that the hydraulics are sound the system is washed clean of mud and build ups and the supply water system is as described Pages 16 TO 19 The system is provided with efficient devices removing air and impurities up to 5 um e g micro impurity separators and micro air bubble separators or a Strebel Boiler
13. Pipe work P1 Heating Pump s use of a Temperature Gauge on the Flow is SV Safety Valve 34 3bar advisable Condense Drain in plastic via a tundish e The boiler is fitted with an Air Vent to vent the Boiler Automatic Air Vents not the system Also needed are Auto Air Vents as DOC Drain Off Cocks shown fitted to all high points recommended are Drain Off Cocks fitted to all low points of the system Boiler Connection Sizes see page 12 Minimum system Pressure is 1 5 bar if less pressure is available see page 25 amp 26 or contact Strebel Please check regulations in force Technical Department for further advice relating to fill systems Page 22 TYPICAL CASCADE SYSTEM Please note that equipment connected below the dotted line is not supplied with the boilers as standard These are available at extra cost from Strebel l LOW LOSS HEADER Strainer DOC Floor standing Boilers connection positions shown for ease of illustration Connections are at the rear Also see information on pages 16 to 18 See page 19 for more Hydraulic information amp Low Loss Header Sizing LEGEND Dirt amp Air Separator Flow Temperature Sensor Safety Valve 3 4 3bar Condense Drain in plastic via a tundish AAV Automatic Air Vents DOC Drain Off Cocks DP Dosing Pot Boiler Connection Sizes see page 12 Please check regulations in force rel
14. Wheel 12 Condensate exhaust siphon 13 Water trap 14 Flue exhaust connec tion 15 Gas feed pipe The gas pressure switch 3 can be mounted in one of the two positions shown see next page 16 Boiler body 14 17 Cleaning and inspection door 18 Automatic air vent 19 Flow probe 20 Flow manifold 21 Upper panel 22 Burner 23 Fan LI s 16 24 Ignition electrodes ie Sid 20 25 Flame detection probe 08 26 Terminal strip 17 8 27 Side panel ii HT 21 28 Air intake or Connection 2m 8 29 Boiler component container 30 Control panel 22 1 y AN EAN 23 AS gt 30 PLAN VIEW Page 14 STREBEL HEATING TECHNOLOGY SENSOR amp CONTROL DEVICE POSITIONS 1 Automatic air vent 2 Flow temperature sensor 3 Boiler body 4 Gas pressure switch 4B Alternative position of Gas pressure switch located at gas valve 5 Pressure gauge connection 6 Return temperature sensor 7 Water pressure switch 8 Boiler drain cock 9 Condensate drain siphon 10 Safety thermostat 11 Boiler body sensor 12 Flue temperature sensor M1 Water flow R1 Water return GAS gt 01 E 12 gt AWATA 0 HT FI H E OL vis STREBEL HEATING TECHNOLOGY STREBEL HEATING TECHNOLOGY NEW INSTALLATION
15. from a Co axial flue Co Axial flues or any air intake must never draw exhaust products in Co Axial flue is for information only The S AF has a separate flue and air or uses Boiler room air intake Page 28 15 HEATING TECHNOLOGY FLUE OPTIONS Flue distances from Walls amp Air Intakes C Co Axial Flue E Exhaust also 600mm from a parapet wall A Air Inlet Through the wall flue room sealed with compartment ventila tion as regulations Co Axial flue is for information only The S AF has a separate flue and air or uses Boiler room air intake Through the roof flue with Boiler room venti lation from outside as per regulations Through the roof flue room sealed with compartment ventilation as per regulations The air intake must be from a correctly ventilated room or consider a ducted plastic flue complies air inlet from a position on the same wall 600mm away from the exhaust and 300mm from ground level Check the flue and air inlet information for Boilers having there own not common flues flue see pages 13 27 to 30 Flue positioning should avoid flue products being drawn in by other Boilers When Separate air intakes are used these should be at least 600 mm and ideally 1mt away from a flue exhaust Supply Air can always be taken from an adequately ventilated Boiler Room Page 29 15 HEATING TECHNOLOGY COMMON NEGATI
16. hour Example of programme with 4 operating periods maximum possibility of the system T of regulated flow e g 7009 OO a 5 6 5 5 5 First operating period 70 0 C From 6 30 to 8 00 2998 From 11 00 to 13 00 9 3 From 17 00 to 20 00 0 mm 4 From 22 00 to 23 00 D 1 0 00 6 30 8 00 11 00 13 00 17 00 20 00 22 00 23 00 24 00 To enter the programming mode press the shaded button pig y fi 4 To programme the heating and shut down time for each individual day of the 5 week for a groups of days press the 2 2 b shaded button amp v vuU 78 _ LUNEN SEC 7 B3 OK Page 53 SETTING THE INBUILT CLOCK OPERATING PERIODS To set the current time see page 42 amp 43 To select the programming for each individual day of the week or for groups of days Press either shaded button It is possible to select Individual day MON TUE WED THU FRI SAT SUN Or MON FRI Group from Monday to Friday Or SAT SUN Group Saturday and Sunday Or MON SAT Group from Monday to Saturday Or MON SUN Group every day To validate the choice made then select the Heating time of the 1 operating period Press the shaded button OK To modify the Heating start period press either shaded button validate the choice made and then select the shut down time of the 1 operating period Press the shaded button OK
17. please contact Strebel Ltd on 01276 685422 HIGH EFFICIENCY OPERATION The heating boilers from the Strebel S AF series are heating boilers with maximum high efficiency High performance is reached by using a special aluminium body of low water content and high heat exchange area to maximise energy efficiency and thermal output The heat exchanger allows flue gases to cool down below condensation point condensing the flue gases and releasing extra heat resulting in efficiencies of over 100 net calorific The Boiler includes a stainless steel total premix micro flame burner that allows high modulation rati os combustion stability and low pollutant emissions NOx class 5 Also included is a variable speed fan for modulation of the air gas mixture which also enables the Boiler to be flue and air intake type C room sealed or type B chimney and Boiler room ventila tion both depending on the layout of the flue ventilation adopted during the installation The control is provided with self diagnosis with a display of error codes and operating parameters when a failure occurs During design engineering specific solutions have been adopted to obtain an optimum air gas mix on a continuous basis reducing emissions and reducing noise A control stand alone Boiler that if provided with an external sensor at extra cost located on a North Wall allows compensation of the flow temperature based on the outdoor temperature SAFETY CONT
18. residues with products compatible with aluminium i e the material of the boiler At the end of the cleaning operations remove suck the residues from the water trap by opening the inspection door and also clean the condensate siphon REMOVAL OF THE CASING Open and remove the front 1 side 2 and upper 3 panels Page 60 15 HEATING TECHNOLOGY CLEANING THE BURNER To clean the burner Remove the fan and the gas valve connections Unscrew the joint 4 of the gas pipe Unscrew the four fixing screws 5 and remove the burn er fan gas valve assembly 6 from the boiler body Be careful not to damage the gasket 7 Remove the combustion head 8 and clean it carefully by using blown air After cleaning reassemble all components by carrying out the above in reverse Replace and position new gaskets if necessary IMPORTANT Make a gas soundness test Cleaning of the heat exchanger Unscrew the nuts 9 and remove the inspection doors 10 and the relevant gaskets 11 Use a tube brush or another tool to clean the channels of the exchanger Strebel can supply as an accessory a Suitable tool metal blade 12 to mechanically clean the flue duct At the end of cleaning operations check the gaskets and if necessary replace them Re assemble Cleaning of siphon and water trap Unscrew the nuts 13 and remove the inspection door 14 Check and clean the water trap At the
19. the display for internal clock control is When an external sensor is fitted stand alone Boiler the Boiler will com pensate ON OFF OPERATION FROM AN EXTERNAL CONTROL PANEL Note Terminals 1 amp 2 are sometimes referred to as TA in this manual Pressing Q again will select in the display This is for control using terminals 1 amp 2 for on off operation If using 0 to 10 volt if programmed this mode should also be selected When an external sensor is fitted On a stand alone Boiler the Boiler will compensate but not on 0 to 10v control To select stand by Press once again The Symbol in the dis play will be The Boiler will be off When an external sensor is fitted On a stand alone Boiler the Boiler will go to a night depression temperature in this mode Page 39 15 HEATING TECHNOLOGY USING THE INBUILT TIMER CLOCK CONTROL Selectable functions are for a stand alone Boiler SUMMER WINTER and OFF NOTE When r4 is selected and the control of the Boiler on off is from terminals 1 amp 2 or 0 to 10 volt operation the inbuilt timer and selectable functions below should not be used DOMESTIC HOT WATER s r A domestic hot water only stand alone 7 fi Boiler according to the inbuilt timer 7 on n ro 3 v i gi J 18 1 6 Press the shaded button V Z7 shown in the illus
20. uses air from the Boiler room if adequately ventilated and to regulations Flue positioning should avoid flue products being drawn in by other Boilers see the information be low When Separate air intakes are used these should be at least 600 mm and ideally 1mt away from a flue exhaust Supply Air can always be taken from an adequately ventilated Boiler Room In stallers must check that Flues comply with the clean air act as defined by the local authority See BS6644 2005 BS5440 2000 IGE UP 10 ed 2 Flues must be to current regula tions Install horizontal exhaust Flue parts with at least 5 2 more than 5 centimetre for every linear metre fall in the direction of condense traps If the boiler is used for con densation drainage a maximum of 2 5 mt run of flue is allowed when no extra conden sate traps are fitted Above 70 Kw net input Below 70kw net input Distance from Distance from G Above 2000mm G Above 2000mm Ground Ground W Side of opening 1000 mm W_ Side of opening 300mm Window Window Adjacent to a Adjacent to a 300 mm Terminal Terminal Vertically from Vertically from 1500 mm a Terminal a Terminal Internal or Ex Internal 300 mm ternal Corner ternal Corner TEE FERE Co axial flue air 600mm Co axial flue air 500mm inlet above a inlet above a window window M Below an open M Below an open 300mm ing window ing window This example shows a Flue exhaust distance
21. 10 volt operation it is necessary to change parameter 18 as detailed on the next page Parameter 18 should be changed from the default 1 setting to setting 7 NOTE When using 0 to 10 Volt control the terminals 1 and 2 have no effect on the Boiler operation therefore no link or control function would be required between terminals 1 and 2 when using 0 to 10v Page 51 PROGRAMMING 0 to 10 VOLT OPERATION To enter the parameter area press for 4 seconds To enter the adjustable parameter area OG Press together S To scroll through the parameters Press either EC Or To change the parameter setting Press either A i Or v y To input the setting press 0 1 To exit the programme press Power down the Boiler to activate the new settings 0 4 0 4 Page 52 J STREBEL HEATING TECHNOLOGY i 15 0 17 15 HEATING TECHNOLOGY USING THE INBUILT CLOCK OPERATING PERIODS Note Normally for a stand alone Boiler and not usable 9 mode It is possible to programme the Boiler on off times if there is heat demand Note when an external sensor is fitted the Boiler will be compensated with night reduction The programmable operating periods are a maximum of 4 over 24 hours Each of them must be identified by a start time ON and an end time OFF The minimum programming interval is half an
22. E PARAMETER SETTING PROCEDURE SEE PAGE 59 FOR PARAMETERS Do not change parameters unless they are shown below or later in this manual as se rious danger or damage could result Description STREBEL S AF parameter 115 150 200 Output of the appliance 4 7 o Calorifier pump anger 4or Alarms Operation with G20 1 or E If an alarm is connected to terminals 7 amp 8 in the Boiler connection block Set parameter PM 04 to 07 Description arameter STREBEL S AF Values settable 115 150 200 240 280 Calorifier pump Alarms 04 7 Only 4 7 If G31 propane is used set parameters 05 amp 06 to 07 these parameters automatically set the fan revolutions according to the table below STREBEL S AF Values settable Description Parameter 200 240 280 Operation with G31 21 0 115 9 35 5 Nominal output Min 200 0 Dh NS 1650 revs di 4 Frequency 55 5 246 7 55 208 3 61 5 66 290 65 290 oo 1650 5250 1665 7400 1230 5600 The values above cannot be changed they for checking with a suitable meter connected to X23 Page 44 15 HEATING TECHNOLOGY STARTING UP OF THE BOILER EXTERNAL To fire up the Boiler Make sure that there is link or external CONTROL closed control contacts TA between terminals 1 and 2 or 10 volts if
23. HW Cylinder stand alone Boiler with a diverter valve spring return or a pump a 3ph pump would require a relay DHW primary pump and relay not supplied Connection for a Boiler pump Pump included where quoted Page 7 15 HEATING TECHNOLOGY IMPORTANT INFORMATION For trouble free operation of the boiler and to be assured of the full guarantee the following items are required together with other stipulations in this manual A An automatic air and dirt separator installed in the return system side of a low loss header alternative pages 25 amp 26 or Strebel Boiler Guard page 19 combined low loss header amp air and dirt separator must be installed in the system Installation of ancillaries and devices must be installed as shown on pages 21 Minimum static water pressure must be more than 1 5 bar Maximum 6 bar The system is fully flushed free of water leaks water tested and additive utilised where nec essary see pages 16 to 19 for information D The Boiler must be level The Boiler must be vented the auto air vent cap where fitted must be open This automatic air vent is only used for bleeding the air from the heat exchanger of the boiler External automatic air vent s and or air separators must always be mounted in the heating system Open all system auto air vents E Low and high water cut out pressure switches usually in the fill unit connected in the Boiler control circuit in series with o
24. N 23 24 25 26 27 15 HEATING TECHNOLOGY When the S AF is used as a stand alone Boiler controlling DHW Parameter 22 sets the maximum power of the Boiler during the domestic hot water phase The power is adjusted in of the maximum power of the Boiler and 18 limited to the domestic hot water phase only TB demand PM 04 4 pump control MAINTENANCE Periodic maintenance is essential for safety efficiency and long life of the Boiler Internal cleaning of the Boiler and removal of the combustion deposits from the exchange surfaces is an operation to be carried out at least once year It is an essential requirement to reduce Gas consumption and pollutant emissions and maintain performance Before starting maintenance and or cleaning Position the On Off Ip Switch and the main switch Ip of the Boiler to OFF Close the gas isolating valve G2 EXTERNAL CLEANING The casing can be cleaned with water and soap In case of stains use specific products After cleaning carefully dry the Boiler Do not use abrasive products petrol or trichloethylene INTERNAL CLEANING OF THE BOILER BODY AND THE BURNER For correct operation of the Boiler it is necessary to periodically clean the burner and the flue ducts in the heat exchanger Fully remove any dirt from the exchanger in order to avoid possible calcifications of the exchanger dur ing the life of the boiler If necessary chemically remove the
25. Off switch with indication light Main fuse 6 3 A Mn Pressure gauge TST Manual reset thermal safety thermostat Sca Not used unless indicated see page 41 Fpc Boiler pump fuse 3 15A Fpb HWS pump fuse 3 15A If the main screen is not displayed and the red light of the main switch Ip 18 press the selector Sca IL Js 12 24 nz T 18 1 1 37 15 HEATING TECHNOLOGY CONTROL BUTTONS TECHNICAL LEVEL TEMPERATURE SETTINGS Parameters Increase amp Decrease of Heating Temperature ud DISPLAY SETTINGS amp INFORMATION See Page RUN Standard Operation 50 INFO Information PROG Programming amp WORKING MODE SELECTION Parameter Access AUTOMATIC ON OFF USING TERMINALS 1 amp 2 or 0 to SETTING OF OPERATING TIMES 10volts WHEN PROGRAMMED Clock Regulation OFF STAND BY FROST PROTECTION IF SET To enter Parameters settings press 0 Ow EE SETTING OF FUNCTIONS WINTER Heating DHW i SUMMER DHW only i NON Frost Protection if Enabled i Only if DHW controlled by the Boiler Page 38 15 HEATING TECHNOLOGY SETTING THE MODE OF ON OFF OPERATION Pressing selects defeats the inbuilt on off timer Press once twice or three times to select mode ly Pressing once selects the in built on off timer The symbol in
26. PROCEED TESTS To make the functional checks proceed as follows r5 5 Enter the parameter menu see page 59 and select parameter 12 and set it to 255 the Boiler then operates at its Maximum Output i Measure the gas flow rate and gas pressure considering any corrective factors Measure CO and CO using an analyser The test hole for flue analysis must not be on a flue bend and should be positioned at a flue diameter X 2 from the outlet of the Boiler example 200mm flue the test hole should be 400mm from the Boiler flue connection see pages 8 or 49 Compare the values measured with those of the table below considering a 5 tolerance Maximum gas 11 96 15 87 21 16 24 97 29 10 Cu mt HR consumption G20 Minimum gas 2 22 22117 3 76 4 50 5 24 consumption G20 Cu mt HR CO2 Max G20 9 3 CO Min G20 9 1 If the values are not as shown on the table below adjust the gas vales as shown on the next page Page 48 15 HEATING TECHNOLOGY GAS VALVE ADJUSTMENT Gas S AF 200 240 and 280 S AF 115 and 150 Adjust the MAX gas adjusting screw positioned on the gas valve page 14 item 2 until the correct combustion values are displayed on the analyser Wy aA Enter the parameters menu see page 59 select parameter 12 pm and set it to O the Boiler operates at its Minimum Output LM 142 HM te Measure the gas flow rate considering any corrective factors Measu
27. Proving switch supply fitting and control connection logic by others Size the Common flow amp return headers using the information on page 21 Boiler connection sizes see page 12 System side pumps are sized to overcome the Plate Heat exchanger and any system side resistance Any difficulty with existing system pump s be overcome by using a pumped Low Loss Header At the system side and existing system pumps The system side can be open vented with normal pre cautions we strongly recommend sealing the system to prevent any possibility of pump over or sealed using the relevant equipment Page 25 15 HEATING TECHNOLOGY SIMPLE SEPARATION OF BOILERS FROM THE SYSTEM System side pumps are not shown but they should be sized to overcome the system resistance and the plate resistance A further low loss header and pump could be used system side of the low loss header if the sys tem side pumps cannot overcome the plate resistance contact Strebel z PHX Plate Heat Exchanger AAV LNE LLH Low Loss Header hs FTS Flow Temperature Sensor DAS Dirt amp Air Seperator DP Dosing Pot Please check regulations in force relating to fill systems System side can be pressurised suitably sized Pressurisation unit and expansion vessel required or open vented Floor standing Boilers pipe connection positions shown for ease of illustration System side pumps etc not shown Connections a
28. ROL DEVICES S AF Boilers are provided with the following safety and control devices 1 Water pressure switch that stops the boiler operation when the pressure of the hydraulic circuit is lower than 1 3 normal operating pressure is 1 5 bar bar 2 Condensate pressure switch that actuates when the flue pressure in the condense water trap exceeds 0 5 mbar 3 Flue safety sensor that activates when the flue temperature is too high 4 Gas pressure switch that activates if the pressure of the supply gas is lower than 14 mbar Note Gas pressure must be to current regulations 5 Diagnosis of the hydraulic circuit it protects the Boiler against any over temperature checking the difference in temperature between flow and return AT If AT increases to 35 C the gas input is reduced to the minimum value If AT continues to increase the Boiler makes 5 re start attempts If AT still increases to 35 C after 5 attempts the Boiler goes to lock out 6 Manual reset safety thermostat Max 110 C 0 6 The Strebel S AF Boiler adjusts to the demand for heat by using flame modulation and or external controls possibilities are 1 Built in 0 to 10 volt to 10 volt signal from others control 2 Strebel optimiser control at extra cost 3 Built in weather compensation stand alone Boiler with an outside sensor 4 Connection for any volt free the control circuit is 230volt control device The boiler control is equipped with Control for a D
29. STREBEL HEATING TECHNOLOGY Strebel Condensing Boiler Range S AF INSTALLATION amp SERVICE MANUAL S AF inst07 12DT STREBEL HEATING TECHNOLOGY NOTES Page 2 15 HEATING TECHNOLOGY SAFETY GUIDELINES YOUR SAFETY IS OF PARAMOUNT IMPORTANCE BE AWARE OF WHAT IS HAPPENING AROUND YOU AT ALL TIMES AND CONSIDER YOUR SAFETY AND THE SAFETY OF OTHERS IN ADDITION ALWAYS ADHERE TO YOUR OWN COMPANY S HEALTH AND SAFETY RULES Do not use in ear sound equipment other than hearing aids BE AWARE Beware of trip hazards If in doubt ASK Do not carry out technical or cleaning work before disconnecting the Boiler from the electrical supply Always position the general switch of the system and the main switch of the Boiler to OFF Also switch off the gas and water supply but only when the Boiler is not firing Do not modify the safety or control devices without the authorization and the in structions of Strebel Do not pull remove twist the electrical cables from the Boiler even if they are dis connected from the electrical supply Do not block or reduce the size of ventilation openings of the Boiler and of the room where the Boiler is installed These openings are essential for proper combustion Do not block the condensate drain Do not leave containers with flammable substances in the room where the Boiler is installed In case of a water leak isolate the Boiler from the electri
30. UTSIDE SENSOR Direct compensation on stand alone boiler boiler using a sensor at extra cost See next page CALORIFIER SENSOR THERMOSTAT WHEN 4 PUMP CONTROL When a calorifier is installed and the primary pump is controlled by terminals 7 amp 8 on the Boiler single Boiler installation a hot water sensor must be connected to these terminals when PM 04 4 pump control Not normally used on multiple boiler installations 0 to 10 VOLT CONTROL A 01010 volt see page 34 source from others will modulate the boiler temperature 0 volts less than 3 volts being Off 62 10 volts being maximum boiler temperature as programmed 0 to 10 volt control 18 rec ommended for BMS Terminals 1 amp 2 have no function when using 0 to 10 volts La ius NN Page 32 15 HEATING TECHNOLOGY OUTSIDE SENSOR OPTIONAL The outside sensor is usually used with stand alone boilers and is not used with 0 to 10v control for direct boiler compensation but 16 not required for normal operation if unwanted The outside sensor must be installed outside the building on a flat wall surface on a north or north west position colder side and away from flue hoods doors windows and areas directly exposed to sun rays For installation Remove the cover fix the sensor then make the electrical connections Minimum section of cables 1 mm Maximum length of the cables 50 m Connectors non polarized perature
31. VE PRESSURE FLUES When the use of an individual flue for each Boiler is impossible the S AF can be used as shown below providing that the flue system is in neg ative pressure draught condition and has adequate condensate drain points Note that the flue branches to each Boiler are not underneath the main flue header this is to avoid excess condensate entering the Boiler Note that the common flue header is sloped this is now industry good practice in order to protect any flue seal from deterioration There is no minimum height for the Boiler s vertical flue riser but the po sition where the Boiler s riser connects to the main flue header must al low space for servicing 111111 EBENEN The main flue riser must produce enough negative pressure to produce more than 3pa negative pressure at the Boiler flue outlet when all Boilers are on full fire Install horizontal exhaust Flue parts with at least 5 29 o more than 5 centimetre for every linear metre fall in the direction of condense traps Bottom support Bracket Page 30 15 HEATING TECHNOLOGY INSTRUCTIONS FOR THE ELECTRICIAN ALARM INDICATION 1 WHEN PROGRAMMED 230 ON OFF CONTROL 230volt terminal 1 out REMOVE LINK z3LU NV HM NOT OUTSIDE MEIN SENSOR 0 10 BOILER See note PUMP p 2 INTERNAL USE T
32. Water Condition and notes on pages 16 17 and below 3 Chemical washing of the plant by using mains water with the addition of a detergent be cause of a clogged system In the case of 1 or 3 above fill the system with new treated water REQUIRED WATER CONDITION The pH must stay between 6 5 and 8 5 The maximum permissible content of chloride is 250 mg l The total quantity of water to be used including topping up with a total water hardness of 20 F must not exceed 20 litres kW If the water hardness exceeds 20 F use the following formula to calculate the total quantity of water to be used 20 F hardness in F x 20 Example with water hardness of 30 F 20 30 x 20 13 5 In this example if the total quantity of water system topping up is higher than 13 5 1 it is necessary to soften the water The water may only be partly softened until a value of 25 of the initial value so if the initial hardness is 30 F it may only be softened to 7 5 F NOTE If the water hardness is expressed in D the conversion factor is 19D 0 56 F If the analysis of a sample of water that will be used to fill the system is within the values indicated the system can be used otherwise an inhibitor must be used For systems operating at low temperature only add an inhibitor against bacterial proliferation WARNING Do not soften the water according to the principle of ion exchange Never fill the plant with distilled o
33. ating to fill systems EJ STREBEL HEATING TECHNOLOGY Interlock with boiler Pressurisation Unit With High amp Low Pressure Switches LNE Heating Expansion by Vessel DOC System Notes S AF Boilers must be installed using a Low Loss Header or Strebel Boiler Guard note special exception relating to plate heat exchanger use as shown on page 25 amp 26 could apply consult Strebel The use of an Dirt amp Air Separator is compulsory A Strainer must be installed on the Return Pipe work Or consider a Strebel Boiler Guard The use of a Temperature Gauge on the Flow is advisable The boiler is fitted with an Air Vent To vent the Boiler not the system Auto Air Vents should be fitted as shown to all high points and Drain Off Cocks fitted to all low points of the system Minimum system Pressure is 1 5 bar if less pressure is available see page 25 amp 26 and contact Strebel Technical Department for further advice Page 23 15 HEATING TECHNOLOGY ROOF TOP BOILER ROOM Pipework layout for a roof top plant room with pipework and AAV s higher than the Boilers by at least 0 5 Mt LOW LOSS HEADER Strainer Interlock with boiler Pressurisation Unit With High amp Low Pressure Switches Heating Expansion i Floor standing Boilers pipe connection positions shown for ease of illustration Connections are at the rear Boiler Co
34. c supply close the water Supply and promptly inform the installer When the Boiler is not used for a long period carry out the following operations af ter consideration of frost protection of the Boiler and system Position the main switch of the Boiler and the general switch of the system in the OFF position close the gas and water valves and drain the Boiler Always consider frost protec tion This manual is an integrated part of the Boiler It must always accompany the Boiler even if it is sold to another owner or user or transferred to another plant Keep this manual save if it is damaged or lost ask Strebel for another copy WORK SAFELY Page 3 INDEX SAFETY ON DELIVERY OF THE PRODUCT THE S AF BOILER DESCRIPTION SAFETY AND CONTROL DEVICES IMPORTANT INFORMATION TECHNICAL DATA TABLES BOILER DIMENSIONS amp WEIGHT HYDRAULIC amp GAS CONNECTIONS FLUE amp AIR INTAKE CONNECTIONS S AF EXPLODED VIEW SENSOR amp CONTROL DEVICE POSITIONS NEW INSTALLATION OR REPLACING AN EXISTING BOILER HEATING SYSTEM CONDITION SYSTEM WATER REQUIRED WATER CONDITION AIR amp DIRT SEPARATORS CONDENSATE DRAINAGE CIRCULATING PUMP LOW LOSS HEADERS SYSTEM LAYOUTS FLUES AND AIR INTAKES FLUE INFORMATION INSTRUCTIONS FOR THE ELECTRICIAN CONTROL CONNECTIONS EXPLAINED OUTSIDE SENSOR amp COMPENSATION 0 TO 10 VOLT CONTROL ON OFF CONTROL CONTROL DISPLAY Page 4 STREBEL HEATING TECHNOLOGY 22 to 26 27 28 t
35. circuits should be thoroughly cleaned and flushed prior to commissioning or following major remedial works The type and extent of debris dirt and fouling commonly found inside central heating circuits largely depend on the age and nature of the system A thorough system clean not only restores system efficiency and effectiveness but is critical in preparing interior surfaces for effective corrosion and scale inhibition that effect the Boiler Before cleaning the system should be examined to determine the system configuration the age and overall condition of components and the nature of the contamination that needs to be cleaned in order to decide the most appropriate cleaning agent and cleaning method Chemical corrosion inhibitors should be added during the final fill of the system at a concentration recommended by the inhibitor manufacturer Tt is important that full circulation and homogenous distribution of the additive is achieved before sampling system water to confirm the correct inhibitor concentration and subsequent adjustment if necessary Strebel recommend Sentinel Products Page 17 STREBEL HEATING TECHNOLOGY SYSTEM WATER Before opening the Boiler isolation valves always confirm that the system is acceptable one or more the following options should have been observed 1 Fully power flushing of the complete hydraulic system 2 The use of the water already present in the plant is good as it complies with notes on
36. cted Flue STREBEL Residual Fan Air Intake Exhaust Air Intake Exhaust S AF Pressure pa Page 10 5 STREBEL HEATING TECHNOLOGY BOILER DIMENSIONS amp WEIGHT SIDE Please Note The above plan drawing includes the vertical flue connection in measurement D Page 11 15 ONU TECHNOLOGY HYDRAULIC amp GAS CONNECTIONS 15 m I 2 connection ea te 279 Page 12 STREBEL HEATING TECHNOLOGY FLUE AND AIR INTAKE CONNECTION DIMENSIONS FLUE STREBEL S AF Install horizontal exhaust Flue parts with at least 5 2 more than 5 centimetre for every linear metre fall in the direction of condense traps A maximum of 2 5 mt run of flue is allowed if no traps are fitted and the boiler is used for condensation drainage The air intake can be if required used to room seal the Boiler according to current reg ulations or Boiler room air to regulations can be used in the normal way Page 13 A C co S AF EXPLODED VIEW 257 18 30 1625 2 15 25 25 LU eem 26 UM ES 1 Front door 2 Gas valve 3 Gas pressure switch 4 Siphon pressure switch 5 Water pressure switch 6 Return probe 7 Manometer connection 8 Return manifold 9 Fill and drain cock 10 Foot 11
37. ctivates the boiler pump in a frost condition when the Boiler water temperature drops below 5 C programmable When the boiler return temperature drops below the 3 C programmable the burner is also ignited The pump and or burner will shut down as soon as the return temperature has reached 109 programmable this function protects the Boiler The stated temperatures are related to the temperatures measured by the RETURN sensor of the boiler This frost protection function will not fire up the boiler in case of a general blocking of the burner This Frost Protection function is for the boiler and not for the whole central heating system A boiler or system damaged by frost is not covered under warranty Fill the condensate drain siphon Item 9 15 before firing the boiler Heating System Water Condition The natural chemical constituents found in supply water can vary in identity and concentration over a large range of values depending on the source location or season The supply water may have effects on the efficiency of heating systems Some constituents may be detrimental depending on their concentrations The effects of constituents in water can result in metal corrosion circulating particulate debris settled sludge poor water flow or blockage and degradation of boiler parts These effects can be avoided by cleaning and flushing and the application of water treatment and periodic system water maintenance Cleaning Heating
38. ee operating periods are used in a day set both ON and OFF times start and end of the 4 operating period at 24 00 To select another day or group of days Press either shaded 9 s 42 button a 18 4 6 1 a UN A Y a WERT 2 4 exit programming Press the shaded button P LI 4 7 4 5 d E S E JL 7 18 11 2 15 x DY 2 OK Page 56 15 HEATING TECHNOLOGY INFORMATION DISPLAYS a 0 To enter the information mode press the shaded button for 4 seconds P OW xu To scroll though the information A fap 17 press the shaded button To change lan a 2 P gt lt 5 guage settings v it DESCRIPTION NOTE BOILER SET TEMPERATURE CH SL FLOW TEMPERATURE AT THE FLOW SENSOR CH O RETURN TEMPERATURE AT THE RETURN SENSOR CH R SET HEATING TEMPERATURE CH S MAXIMUM HEATING TEMPERATURE CH MX MINIMUM HEATING TEMPERATURE CH MN HW O gt HW SA HW MX HW MN USED REG BUI LD YSELF EXTERNAL SENSOR DO NOT ADJUST ENGLS 0 ENGLISH 1 ITALIAN 0 1 YES 0 gt A LANGUAGE FROST PROTECTION To display the outside temperature measured select EXT C in the menu INFO
39. end of cleaning reas semble the inspection door and check for soundness If nec essary replace the gasket Unscrew the ring nuts 15 and 16 and remove the siphon Check for any water leak Unscrew the ring nut 17 and carefully clean the internal parts of the siphon Re assemble Page 61 15 HEATING TECHNOLOGY CLEANING AND REPLACEMENT OF THE ELECTRODES WARNING JH ng When removing the electrodes be careful not to damage the 11111 7 gaskets 18 and 19 If they are damaged replace them Unscrew the fixing screws of the electrode assembly 20 remove and check It is recommended to replace the electrodes Unscrew the fixing screws of the probe 21 remove it and check it If necessary replace it It is recommended to replace the electrodes when servicing Fully check the combustion after servicing the Boiler The values should be as shown on page 47 within the given tolerance Fault codes are show on page 47 of this manual Stand alone boiler with an external sensor Any fault of the external sensor can be detected by selecting EXT C in the menu INFO will be displayed instead of the value of the external temperature detected Page 62 STREBEL HEATING TECHNOLOGY PROBLEM SOLVING Gas smell Gas supply circuit Check for soundness of gaskets and check that the pressure nipples closed Un burnt substance smell Flue circuit Check Gasket
40. ermostat panel Check the function and the posi tion of the thermostat Page 63 FJ STREBEL HEATING TECHNOLOGY INTERNAL ELECTRICAL DIAGRAM EE ENS Terminal Main 7 Ep Block 1 2 3 415 6 7 sls Pressure Switch of 11 r i Sensor Exhaust Sensor bee Safety Stat Wiater _____ Pressure 720 pto 77 8 Igniter 1 _ pw Pressure s r User Interface Ignition Electrode Electrode 64 STREBEL HEATING TECHNOLOGY Page 65 15 HEATING TECHNOLOGY Declaration of Conformity Under the EC DIRECTIVE on machinery 89 392 EEC 91 386 EEC 93 68 EEC and the EC DIRECTIVE ON ELECTROMAGNETIC COMPATIBILITY 89 336 EEC 91 263 EEC 92 31 EEC 93 68 EEC have been constructed in conformity with the applicable provisions of the EC DIRECTIVE on machinery and the EC DIRECTIVE on EMC Strebel Ltd Strebel Ltd Tel 01276 685 422 1F Albany Park Industrial Estate Fax 01276 685 405 Frimlev Road Email info strebel co uk Website www strebel co uk Camberley Surrey We are pleased to inform you that additional GU16 7 information and literature is also available on our website
41. es referred to as lock out due to no light up 01 E see the fault codes on the next page 4 fi 11 OK 4 P OW To restore normal operating conditions proceed as follows Depending on the type of error displayed it 1s possible to restore normal operating conditions By pressing the button OK on the control panel of the Boiler By removing the voltage to the Boiler then switching back on after 10 seconds By addressing the failure e g reset the safety thermostat on the control panel Checking then fixing the reason for the blocking then resetting b 4 Page 47 STREBEL HEATING TECHNOLOGY FAULT CODE TABLE The boiler does not light up Safety thermostat intervention Gas pressure switch General failure Water pressure switch Siphon pressure switch with boiler SHUTDOWN Fan check NTC sensor heating flow NTC sensor boiler body External NTC sensor Flue NTC sensor interruption Condensate drain intervention probe Ghost flame detected by the probe Return sensor Siphon pressure switch Water pressure switch with boiler firing AT flow return High temperature of the boiler body Gas pressure switch problem Electrical voltage frequency NOTE for alarm signalling to the main control panel see pages 31 amp 32 COMMISSIONING THE PREMIX MICRO FLAME BURNER GAS INPUT CARRY OUT FULL SAFETY CHECKS BEFORE COMMISSIONING THEN SEE PAGE 38 THEN
42. iece Beware the Boiler is Heavy see table on page 11 To avoid injury consider the weight of the Boiler WARNING Use suitable safe working equipment and devices to remove the package and to handle the Boiler The staples on the wooden crate should be made safe to avoid injury or cause damage to the boil er casing HANDLING Remove the package and proceed as follows Remove the front door 1 to facilitate handling Insert two 2 1 pipes of suitable strength into the housings or use a fork lift etc 3 under the Boiler lift and handle it with suitable equipment Do not dispose of the packaging material without consideration of the environment It can be a potential source of danger Dispose of packaging in accordance with the regulations in force The Strebel S AF includes the following documents and accessories Installation instructions for the installer User instruction incorporated The manual provided with the Boiler is an integrated part of the Boiler It should be read carefully before installation and commissioning of the Boiler and kept for future reference or for when the Boiler is transferred to another owner or user Page 6 STREBEL HEATING TECHNOLOGY THE S AF BOILER DESCRIPTION These instructions are written for the installer of Strebel S AF Boilers and contain all the necessary information for the specifying of S AF boilers Please read all these instructions fully If you require further help
43. ng are compatible with the system and maximum operating pressure of 6 bar The condensate drain siphon 15 filled and the pipework 18 installed correctly The wiring connections have been carried out properly IG Everything is according to this manual Electrically power up the Boiler by positioning the on off switch of the plant IG and the main switch of the BOILER Ip to ON The Main Screen will be displayed if not see below If the main screen is not EU FE displayed and the red light of x m the main switch Ip is lit up 2 press the selector Sca Make sure that the boiler is in stand by after pressing the button r several times to select the stand by function Page 41 15 HEATING TECHNOLOGY TIME DISPLAY SET UP Set the time as follows Press the shaded button shown in the illustration below until the read out is shown in the display Use the shaded buttons to select and adjust what is required x PROGRAMME To enable the setting of the current time press P nu ok i 6 o gt lt gt 11 MA 44 4 4 To set the current time press y either button which sets the nrc 7 hours v il DAYA OK To validate the time set memorize it and then set the minutes press OK A b A EX 20 Xue
44. nnection Sizes see page 12 Please check regulations in force relating to fill systems SYSTEM Page 24 STREBEL 257 HEATING TECHNOLOGY BOILERS WITH SEPARATION FROM THE SYSTEM Volt Free Volt Free Enable Strebel S AF Boiler Enable Floor standing Boilers pipe connection positions Su shown for ease of illustration Connections are at the rear Example Flow and Return 10 Main WT Heating Flow Proving Condense Condense Drain Drain NE NR Boiler Boiler Plate Separation Shunt Shunt Kit and Pumps amp rump 1 Pump Te m ah Loop Loop Primary Loop fil fil loop loop 3 p Please Note Example Only All additional items shown with aur i m Boilers are available to purchase at 011 ine 711 Extra Cost excluding Pipe Wales 15A AGL AGL 134 and Fittings Please check regulations in force relat ing to fill systems Lay Lay doc doc Expansion Expansion Vessel Vessel Strebel recommend using a low loss header on this type of system as shown on page 26 therefore no flow proving or closed loop would be required If space dictates otherwise see below Size the primary loop circuit pump to cater for the total mass flow of all the Boilers at 20c delta T The pump head is sized to overcome the plate resistance The Boilers should not start up until the main loop pump is proved by the Flow
45. o 30 STREBEL HEATING TECHNOLOGY CONTROL AND GAUGE POSITIONS 37 CONTROL BUTTONS 38 SETTING THE MODE OF ON OFF OPERATION 29 ON OFF OPERATION FROM AN EXTERNAL CONTROL 39 USING THE INBUILT TIMER CLOCK CONTROL 40 CONTROL COMMISSIONING 41 TIME DISPLAY SET 42 amp 43 SETTING IMPORTANT INITIAL PARAMETERS 44 STARTING UP THE BOILER 45 amp 46 ERROR SCREEN AND RE SETS 47 FAULT CODE TABLE 45 amp 48 COMMISSIONING THE PREMIX MICRO FLAME GAS BURNER INPUT 48 GAS VALVE ADJUSTMENT 49 FROST PROTECTION TEMPERATURE 50 0 TO 10 VOLT CONTROL 51 PROGRAMMING 0 TO 10 VOLT CONTROL 52 USING THE INBUILT CLOCK OPERATING PERIODS 29 SETTING THE INBUILT CLOCK OPERATING PERIODS 54 56 INFORMATION DISPLAYS CONTROL PARAMETER SETTING PROCEDURE PROGRAMMING PARAMETERS MAINTENANCE CLEANING THE BURNER CLEANING AND REPLACING THE ELECTRODES PROBLEM SOLVING INTERNAL ELECTRICAL DIAGRAM Page 5 57 59 60 62 15 HEATING TECHNOLOGY ON DELIVERY OF THE PRODUCT After reading all the safety instructions the installer should unpack and immediately check that the Strebel S AF is complete and without any defects Any damage should be reported immedi ately to the supplier or Strebel Ltd The Boiler should be protected and re packed until the Boiler is fitted The Boilers STREBEL S A F are supplied in a single package on a wooden pallet protected by card board and wooden crate The Boiler is supplied in one p
46. of E LNE gt lt LLH H3 Low Loss Header Height 04 Low Loss Header Diameter Vessel D1 Diameter of common Flow amp Return Headers DOC DOC Boiler Connection Sizes see page 12 Please check regulations in force relat ing to fill systems Also see information on pages 16 to 18 15 HEATING TECHNOLOGY TYPICAL SINGLE BOILER SYSTEM LAYOUT Floor standing Boilers pipe connection positions shown for ease of illustration Connections are at the rear of the Boiler The Low Loss Header could also be in a vertical position with the AAV in the correct place at the top pc Also see information on pages 16 to 18 Please note that all equipment connected below the dotted line is not supplied with the boilers as standard These are available at extra cost from Strebel Interlock with boiler LNE mM Pressurisation Unit With High amp Low GAS LINE Pressure Switches DAL __ _______ Heating Flow 8 Return DOC DOC AAV LNE AAV P1 i Low Loss Header DOC Heating Expansion Vessel DAS Strainer See pages 21 for more Hydraulic information amp System Notes e S AF Boilers must be installed using a Low Loss Pow LOSS Header and the use of an Dirt amp Air Separator LEGEND ALTERNATIVE SEE PAGE 19 is compulsory A DAS Dirt amp Air Separator Strainer must be installed on the Return
47. olts less than 3 volts ELECTRICAL CONNECTIONS In order to have access to the terminal strip MC remove the front casing 1 insert the cables in the cable clamps 2 positioned over the terminal strip MC and make them pass through the conduit 3 in the internal part of the casing An electri cal knock out K O box by others if wanted can be mounted on the rear galvanised casing to cov er item 3 termination First use a hole cutter on the rear of the K O box and grommet as required Once the connections have been made reassemble the front casing 1 Page 31 STREBEL HEATING TECHNOLOGY CONTROL CONNECTIONS EXPLAINED 1820 ON OFF CONTROL OF THE HEATING BOILER After removing the link in terminals 1 amp 2 a volt free control devices can be connected not usable with 0 to 10 volt control see pages 13 amp 14 The circuit 1s 230v live out from terminal 1 BOILER PUMP The Boiler pump 15 energised from these terminals The pump 1s sited to suit site conditions and requires materials and connection by others 3 phase pumps require connections and a relay by others Strebel recommend relays for pumps ALARM INDICATION OR DHW PRIMARY PUMP The outputs of the terminals 7 8 parameter 04 can 1 be configured to control the management of an alarm signal PM 04 7 alarm management 2 be for a stand alone Boiler and power a sensor required at extra cost DHW primary pump For DHW PM 04 4 pump control O
48. r water filter and or a dirt separator in the return pipe system side of the low loss header in such a way that the water going to the boiler is free of any debris particles When using a water strainer or BG always check a week after installation to determine the strainer BG cleaning interval Mount valves before and after all devices Fit air bleed valves Even when fit ting air and dirt separators the system water is very important see page 16 blocked and or partial ly blocked exchangers including failures and or damages caused by such blockage are not covered by the warranty Volt Free Volt Free AAV Enable Strebel S AF Boiler Enable STREBEL BOILER GUARD LE Example Flow Example Flow and Return to and Return to Main Heating CT ar DHW T T as e o Es pr Condense Condense to Drain to Drain E n NE Boiler Shunt Shunt Pump 3 Pump Boiler The Strebel Boiler guard acts as a low loss header dirt and air separator and if a magnet set 18 loop Pressurisation at extra cost fitted a magnet AAV f Unit ite separator 1 ine 711 AGL 13A Heating Expansion Vessel dac CONDENSATE DRAINAGE Points to remember when routing condense pipework The pipework must be plastic Run pipework sloping to outside as steeply as possible Be aware that condensate can freeze so where possible pipework should route internally Increa
49. r demineralised water because it corrodes the aluminium heat ex changer severely If the plant is filled and topped up with softened water to reduce the total hard ness the water must be conditioned in order to keep the pH within the correct threshold to avoid any corrosion Use a log book to record water filling refilling and topping up water quality measurements and wa ter treatment Install a water meter to check the amount of filled refilled and topping up water The conductivity of the non treated plant water must not exceed 600 us cm If the water of the system is treated the instructions of the manufacturer of the product used must be followed The conductivity must not exceed 2000 NOTE If the conductivity is higher than the values indicated above flush the system rinse and fill with clean tap water adding the recommended products If an automatic filling system is used a water meter should be provided in order to identify any leak Do not drain the water from the system during ordinary maintenance even if the quantity is small for example for filter cleaning Always provide the Hydraulic system with suitable isolation valves Systems filled with anti freeze agent require the use of a plate heat exchanger Page 18 15 HEATING TECHNOLOGY AIR amp DIRT SEPARATORS Consider a Strebel Boiler Guard BG combined low loss header dirt and air separator shown be low or install a straine
50. rce If the Boiler is room sealed the Boiler room must have compart ment ventilation DO NOT block or reduce the size of ventilation openings of the boiler room or of the Boiler It is recommended to use flue s complying with EN1856 1 and EN 1856 2 The flue must comply with the regulations in force and be fitted with condensate drains The flue should give a negative pressure at the connection with the Boiler The boiler condensate must only drain the condensate from the boiler and a short flue run Flues over 2 5 mts need extra syphon u traps Supply and route the discharge pipework from the Boiler water trap to a drain The Flue system must be suitably sized for condensing units Unsuitable or wrongly sized flue systems can generate combustion problems and create noise Tilt the flue exhaust by 5 2 and towards condense traps The BOILERS STREBEL S AF are provided with 1 A flue exhaust temperature sensor that in case of abnormal increase in temperature immediately stops the operation of the unit 2 A Condensate pressure switch that actuates when the flue pressure in the condense water trap exceeds 0 5 mbar See page 19 relating to condense Page 27 15 HEATING TECHNOLOGY FLUE INFORMATION The S AF Boiler has a fan pressure capable of overcoming Flue resistance and Air inlet resistance both added together for single Boilers or Boilers with separate flues See the Table on page 10 The S AF Boiler usually
51. re and CO by means of the analyser Compare the values measured with those of the table on page 48 considering a 5 tolerance Flue gas test point by others D 200mm Flue 2D 400mm Or D 150mm Flue 2D 300mm If the values do not correspond to the table on page 48 gradually adjust the MIN gas adjusting screw on the gas valve until the correct combustion values are displayed on the analyser Select again parameter 12 as previously carried out and set it to 250 and make sure that the Boiler is at maxi mum output Re check the combustion readings and if necessary make adjustments at both maximum and min imum output WARNING If the values cannot be achieved check that The flue exhaust ducts or the air inlet ducts have no obstructions The gas pressure is not lower than 18 mbar G20 U K mains gas and 25 mbar G31 The number of revolutions of the fan is correct see page 40 Page 49 15 HEATING TECHNOLOGY FROST PROTECTION TEMPERATURE WITHOUT EXTERNAL SENSOR To set the frost protection temperature Not required when using the Boilers own outside sensor To enter the programming mode press the shaded button 1 fi 4 ON 4 Cr 4 E EP e 4 xm Oni A 21 E LI 41 ASENA ov 3j iy DAY 3 OK 15
52. re at the rear Boiler Connection Sizes see page 12 Page 26 STREBEL HEATING TECHNOLOGY FLUES AND AIR INTAKES NON ROOM SEALED BOILERS Ventilation to BS6644 2005 IGE UP 10 ed 2 SEE CURRENT REGU LATIONS BS5440 is not applicable to the S AF ROOM SEALED BOILERS Type C as defined by B S 6644 2005 Installation in a boiler room The ventilation provided shall be adequate to ensure that the boiler room temperature meets the re quirements as follows The air supplied for boiler room ventilation shall be such that the maximum temperatures within the boiler house shall be as per current regulations 25 C at floor level 100 mm above floor level 32 C at mid level 1 5 m above floor level and 40 C at ceiling level 100 mm below ceiling level Ventilation must be to BS 6644 MULTIPLE BOILER INSTALLATIONS separate flues provide the most efficient operation on any multiple Boiler system Common flues must be in negative pressure see pages 28 to 30 When the boiler room or fitting space complies with the relevant ventilation requirements boilers can be non room sealed i e exhaust only providing ventilation complies with current regulations Alternatively S AF Boilers can be used in a room sealed application See page 13 for flue connection details WARNING The Boiler normally intakes air from the boiler room IT MUST BE PROVIDED with ventilation in ac cordance with regulations in fo
53. sary set parameter 21 summer to winter outside temperature NOTE If necessary it is possible to modify the set calculation with a selected curve offset of 15 or 15 C by actuating trimmer P3 see WIRING DIAGRAM on page 64 directly on the board inside the electrical housing Rotate the trimmer clockwise to the maximum to obtain a 15 C offset When rotat ing the trimmer anticlockwise to minimum a 15 C offset is obtained Page 33 15 HEATING TECHNOLOGY 0 TO 10 VOLT CONTROL Simple control idea for 0 to 10 volt control of One Boiler or Multiple Boilers Note No power supplies etc shown All Boilers require a power supply etc and local isolation Common fault indication 230v on terminals 7 amp 8 Terminals 1 and 2 have no function when using 0 to 10 volt operation The Boiler pump is wired back to the Boiler control panel with isolation all by others to suit site conditions and requirements parameter change is required 18 to display 07 see 51 and 52 Zo ae 0 to 10 15 control wiring 14 BMS CONTROL with 0 to 10v control regime BY OTHERS BMS Control and wiring by others Page 34 15 HEATING TECHNOLOGY ON OFF CONTROL The following drawing shows a simple control idea for the S AF Simple Relay control using volt free contacts of the S AF The relay makes terminals 1 amp 2 230vol
54. seals Flue obstructions Irregular combustion Supply gas pressure Check the setting Dirty burner and or exchanger Check the conditions Dirty suction and or outlet ducts Check the conditions Gas valve settings Check the frequency see page 33 Fan revolutions connector X23 Delays in firing with pulses to the Firing power Parameter 14 to be set Check the setting expressed 90 burner in a more accurate manner of the Boiler The Boiler does not reach the correct Dirty Boiler body Clean the combustion chamber temperature Insufficient burner output Check the burner setting 0 to 10 volt if used not correct Try normal operation using ter Set temperature incorrect minals 1 amp 2 note programme change required The Boiler has reached the right External circulation problem Vent the plant temperature but the heating system is Check the heating pump cold Replace the pump Frequent actuation of the Boiler Safety valve of the plant Check its setting or efficiency safety valve Plant pressure Check the air cushion pressure Check the pressure reducer Check the load valve Plant expansion vessel Check the efficiency The Boiler pump does not work Pump blocked electrical connections Check pump and connections External Boiler controls Check the controls and the con nections Calorifier pump when fitted not Pump blocked electrical connections Check the pump running Check the electrical connection between the pump and the control Calorifier th
55. sing pipework size could help prevent blockage from freezing Pipework running externally should be as short as possible and insulated also consider avoiding ex posed positions Consider trace heating which is thermostatically controlled for the condensate pipework Consider an automatic pump unit specifically for removal of condensate if no drain point is easily accessible Ideally condensate should route to the sewer drain complying with local and national regulations BS 6644 states Alternatively the condensate can be discharged into the rainwater system or a purpose made soak away Always comply with local and National regulations and if in doubt contact the appropriate authority Strebel will commission Boilers on the understanding that the suitability of the condense drainage system is checked by others and that compliance is always checked by others Page 19 15 HEATING TECHNOLOGY PRESSURE DROP mbar CIRCULATING PUMP The Boiler pump must always be energised from the Boiler as the advanced control system checks that the pump starts up when energised The pump is connected to the boiler terminals 3 amp 4 see page 31 by others using relays and local isolation where required The graph below shows the pressure loss curves of the S AF Boiler range PUMPS PROVIDED BY STREBEL ARE MATCHED TO THE BOILER 2111 1135 of ff ot l FY ff YY Y fF 214 _ A
56. t in each Boiler All other control and safety devices control the relay Common fault indi cation 230v on terminals 7 amp 8 One or an unlimited number of Boilers can be activated using this control system providing each Boiler has its own clean relay contacts No external tempera ture sensor fitted therefore no compensation No function when using 0 to 10 volt control Note No power supplies or isolation etc shown All Boilers require an individual power supply etc and local isolation The Boiler pump is wired back to the Boiler control panel with isolation all by others to suit site conditions and requirements ee ee OLD CTS Optimiser Page 35 15 HEATING TECHNOLOGY CONTROL DISPLAY Internal clock operation is defeated in Ww mode STAND DHW NOT FAULT BOILER BOILER BY USED ON OFF A Rh m ES LR i d ge i HALF HOUR 1 SEGMENT ONE HOUR J 18 2 SEGMENTS WEN E _ TIME OR 11 4 SELECTED 4 754 71 71 ULL 5 FLAME LEVEL DAY 4 Qv 3 6 DAY OF WEEK AUTOMATIC SLEEP MODE NOT USED OPERATION CONTROL OPERATION USING TERMINALS 1 amp 2 OR 0 to 10 VOLT OPERATION WHEN PROGRAMMED Page 36 S STREBEL HEATING TECHNOLOGY 1 STREBEL HEATING TECHNOLOGY Tp1 lu Ip Fu Mn TST Tp1 Control Option Position lu User interface On
57. ther controls on terminals 1 amp 2 31 amp 32 or by 0 volt when us ing external 0 to 10 volt control by others See 34 F Control of Boiler on off must never be by interruption of the mains supply G When using a common flue separate flues recommended note when all the boilers are at high fire the flue system see page 30 must be in negative pressure H S AF flue gases have a low temperature below 85 C the boiler needs to have a high efficiency approved stainless steel or approved plastic flue system OW I Suitable condensate pipework as described on page 19 J A gas supply to current regulations with local isolation Gas connection see page 12 K A pressure relief valve PRV is not provided with the Boiler A PRV should be chosen to suit the system L A suitably sized expansion vessel at extra cost is required on all sealed systems M A flue gas test point not on a bend positioned twice the flue diameter distance from the Boil er flue connection Example 200mm flue site the test point 400mm away from the Boiler flue connection see below NOTE A purpose made flue gas test point is normally provided by the flue supplier Flue piece above the dotted line is not included in Strebel supply Flue gas test point by others D 200mm Flue 2D 400mm Or D 150mm Flue 2D 300mm Page 8 15 HEATING TECHNOLOGY TECHNICAL DATA Description fud Grma
58. tration until the AISG M buf Shaded icon is displayed A 2 OK 96 Below WINTER MODE Heating and hot water according to the inbuilt amp fi timer 2 PL Press the shaded button EA NN shown in the illustration until e LELEIJ E i is displayed P 7 c a OK OFF if programmed off will give frost protection to the Boiler Press m A 1 a 11 the shaded button shown in Ss the illustration below until the blank _ E N N shaded box 9 jis displayed ae v LL J 18 6 i 52209 i 40 15 HEATING TECHNOLOGY CONTROL COMMISSIONING PRELIMINARY CHECKS BEFORE ANY COMMISSIONING The S AF leaves the factory set for G20 natural gas operation but can also operate with G31 propane with a parameter setting see page 44 Before commissioning of the Boiler define the type of gas used and also check that The fuel and water system shut off valves are open The mains gas pressure is suitable and the gas line 1s vented The cold hydraulic circuit pressure is higher than 1 5 bar and the circuit is bled of air The expansion vessel is installed suitably sized and preloaded The flue exhaust and the air inlet openings are suitable The type of on off control is by terminals 1 amp 2 or 0 to 10v or the inbuilt timer control The safety valve and its rati
59. ualified engineers in accordance with current regulations e Check that the Expansion vessel is sized correctly for the system Page 16 STREBEL HEATING TECHNOLOGY NEW INSTALLATION OR REPLACING AN EXISTING BOILER The safety valve outlet must route to the drainage system The manufacturer is not responsible for any flooding due to the breakdown of the safety valve The choice and the installation of the system components are made by the Installer who must comply with the standards in force and the rules of good practice Always install isolating valves so that the boiler can be isolated from the heating system when needed Make sure that the safety valve is mounted between the boiler and the isolation valves The pressure relief valve safety valve must always be installed in such a way that it cannot be isolated from the boiler by a valve The specifications and size of the safety valve should be determined by the installer designer and must comply with all applicable regulations By pass There is no inbuilt By Pass in the Boiler Low loss headers or Strebel Boiler Guard page19 should be used for the S AF See page19 amp 21 if this is not practical contact Strebel Pump function The Boiler pump controlled from the boiler starts running when there is a heat demand When a heat demand stops the pump will continue to run for a programmed time Frost protection The boiler has built in frost protection that automatically a
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