Strebel S-CB Wall Hung Condensing Boiler Range Installation, Operating & Maintenance Manual Page 1 Version 10 2011 pubdt
1 SAFETY GUIDELINES This manual is written for: The installer System design engineer The service engineer The following symbol is used in this manual: Giving extra attention for the safety of persons and their surrounding. Read all these instructions before commencing installation. Read the instructions before installation, to ensure that all work is done correctly. Keep these instructions together with the user manual near the boiler for quick reference.
Contents SAFETY GUIDELINES Page 2 INSTALLATION OF THE SCB UNPACKING 4 INTRODUCTION 5 IMPORTANT INFORMATION 6 GENERAL DATA S-CB BOILERS 7&8 4. DIMENSIONS CONNECTIONS FLUES 9 &10 6.
Unpacking The Strebel S CB includes the following documents and accessories: Installation instructions for the installer. User instruction (incorporated). 1 suspension bracket. Fuses and 3 nuts for mounting the burner plate (attached to the front of the gas valve). 1 siphon with tightening nut and gasket. Reducing couplings (where required) for flue gas discharge and air supply. THE BOILER IS SET FOR NATURAL GAS G20.
INTRODUCTION Warning: 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 (alternative pages 23&24)must be installed in the system and a strainer installed in the return pipework. Installation of ancillaries and devices must be installed as shown on pages 19 or 20. B. Minimum static water pressure must be more than 1 bar.
IMPORTANT INFORMATION Flues Flues must be to current regulations and conform to the clean air act. Ventilation Ventilation must be to current regulations Gas Pressure Gas Pressure at the Appliance must be to current regulations Electrical connections Electrical connections must be to current regulations. Water Quality See pages 27 & 28 for important information on system water quality. Condensate Drainage Points to remember when routing condense pipework. The pipework must be plastic.
GENERAL DATA Product Identification Number CE 0063 BP3254 Dimensions (h x w x d) mm 842 x 476 x 486 Classification 898 x 476 x 677 II2H3P (for NL II2L3P) Gas Appliance Type B23; C13X, C23X, C33X, C43X, C53X, C63X, C83X Type Boiler 60 80 100 120 150 180 Water content est. Litre 3.9 5 6.5 8.3 10.4 12.
Temp. flue gas est. @ comb. air temp 20ºC Available pressure for the Flue system** °C ≈ 85-95 Pa 200 Max. flow temp. °C Power supply V / Hz Power consumption W Protection class 90 90 90 90 90 90 230 / 50 230 / 50 230 / 50 230 / 50 230 / 50 230 / 50 355 355 355 375 460 460 IPX4D IPX4D IPX4D IPX4D IPX4D IPX4D NOTES * Emissions measured during unit certification ** Maximum combined resistance of flue gas and air supply piping at high fire.
SCB 60Coaxial to !120Flue Co-Axial/concentric Standard SCB 60—120 connection at the rear. Twin Pipe Flue using adaptors at extra cost A SCB A B 155 150 80 100 120 112 135 60 B Install horizontal Flue parts under 5.2% fall in the direction of the boiler Coaxial flue is standard supply on 60kw to 120kw Boilers.
SCB 150 & 180 PARALLEL FLUES F/R Flow/Return 1½” Male A1/FG Flue exhaust/Air inlet 130 /130 mm C Condensate Hose 25/21 x 750 G Gas 1” Male Co-Axial/concentric connection at the rear. Separate exhaust and air inlet connections are: Flue exhaust at the rear and air inlet at the front Install horizontal Flue parts under 5.2% fall in the direction of the boiler (more than 5 centimetre for every linear metre) complete with extra drain points with a 60mm water trap.
FLUE RUN & FLUE TERMINAL INFORMATION The SCB Boiler has a fan pressure capable of overcoming 200pa of Flue resistance and Air inlet resistance both added together. See the Table on page 42 for flue part resistances. Flue positioning should avoid flue products being drawn in by other Boilers see the information below. When using separate air intakes 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.
COAXIAL FLUE & FLUE EXHAUST, PITCHED ROOF & WALL POSITIONS D D C A W D Above 70 Kw net input G Below 70kw net input 2000mm G From Ground W Side of opening 1000 mm Window W Side of opening 300mm Window A Adjacent to a Terminal A Adjacent to a Terminal V Vertically from 1500 mm a Terminal V Vertically from 1500 mm a Terminal C Internal or External Corner 300 mm C Internal or External Corner 300 mm P Distance from Roof Line 600 mm P Distance from Roof Line 600 mm Distance 600m
PLACING & FITTING THE BOILER CONSIDER THE FOLLOWING Prepare the Boiler for mounting on a non combustible surface. Determine the positions for the flow and return pipes using the suspension bracket (see next page) or a suspension frame, if any. When marking the holes, ensure that the suspension bracket or frame is level. Drill the holes for the flow and return pipes if required then hook the heating boiler (the Boiler is Heavy see table on page 7.
440m 395mm 60 75 MOUNTING BRACKET 8mm 15mm 8mm THE BOILER MUST BE LEVEL TO DRAIN THE CONDENSATE The SCB boiler is supplied with two adjustable threaded M8 nuts on the rear of the boiler casing. These nuts must be adjusted during the boiler installation, to ensure that the boiler is mounted perfectly horizontally from front to back (i.e. the boiler should not slope to, or away from, the wall on which it is mounted).
All lines/piping must be mounted free of tension. The weight of all the installation components should be supported separately from the boiler so there will be no standing force on the connections. This could influence the mounting position of the boiler. Always install isolating valves, so 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.
Water quality The pH value of the water must be within the following limits: 7.5 < pH < 9.5. This pH value is reached with the stable conditions. These stable conditions will occur, when after filling the heating system (pH around 7) with fresh water, the water will lose it’s air because of the air bleeding operation and heating up (dead water conditions). Water hardness must be within the following limits: 3.5° Clark (50 ppm CaCO3) < Total Hardness < 10.
Automatic air vent An automatic air vent is mounted on the boiler to remove the air from the water circuit. REMINDER: This automatic air vent is only used for bleeding the air in the heat exchanger of the boiler. One or more external automatic air vent(s) and/or air separators must always be mounted in the heating system to take out the air trapped in the heating circuit. DE-AERATION PROGRAM. When the unit is fired for the first time the unit starts a de-aeration program.
Condense Water Drain The condense Water drain is underneath the Boiler at the centre, it has a 3/4” hose attached. Insert the flexible hose into a tundish or oversized PLASTIC waste, never use copper or steel. A waste trap may be required in the normal way. Condense water must flow easily away from the boiler. Blockage of the pipe could damage the Boiler and void the warranty. Additional condense drain points should be added to the flue exhaust , on runs of over 3 mt.
Low Loss Header Low Loss Headers MUST be used (page 23 differs) with the S-CB Boiler Range. Low Loss Header details are below: 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.
Typical System Layouts Single Boiler System Layout Also see information on pages 15 to 17 S-CB Boiler 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 .
2.2 Typical Cascade Boiler System Layout S-CB Boiler 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.
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Please note the compulsory use of AAV’s in the primary loop SCB Boiler SCB Boiler Please note the compulsory use of AAV’s in the primary loop Plate Heat Exchanger AAV AAV AAV 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 Size the Common flow & return headers using the information on page 19 System side pumps and hydraulic detail not shown.
System side pumps not shown but they should be sized to overcome the system resistance and the plate resistance.
INSTALLATION INSTRUCTIONS FOR THE ELECTRICIAN Connecting to the mains power supply The electrical connections to the S-CB are made via discreet plugs and sockets which are located within the boiler casing, on top of the control panel. Connections must only be made using appropriate diameter multi strand flexible cables. Cable entry must only be via the rubber gland cable points with the rubber glands located at the bottom of the appliance.
Extensive Information relating to the control and parameters is available in the Electrical Control Commission Manual Description of Controls Connections 1-2 OUTDOOR SENSOR When an outside temperature sensor is connected, the boiler will control the flow water temperature by using a calculated setting, which is relative to the outside temperature. PARAMETER : No parameter settings needed.
9-10 EMPTY 11-12 EXTERNAL WATER PRESSURE SWITCH A water pressure sensor is mounted in the boiler. As an option an external water pressure switch can be installed. The sensor can be replaced by the water pressure switch, which can be wired to the terminals. When terminals 11-12 are not bridged/made, the boiler will lock-out. PARAMETER: A parameter change is needed. 13-14 ON/OFF CONTROL OPTION 1: An ON/OFF thermostat can be connected.
Please note additional sensors or relays may be required at extra cost Sensor values SENSOR SENSOR TYPE SENSOR VALUE S1 Internal flow sensor NTC-10K-B3977 S2 Internal return sensor NTC-10K-B3977 S3 External flow sensor NTC-10K-B3977 S4 Calorifier/tank sensor NTC-10K-B3977 S5 Outdoor sensor NTC-12K-B3740 S6 Flue gas sensor NTC-10K-B3977 Conversion table temperature vs. resistance except outside sensor.
Control Schemes Note: No power supplies etc. Shown. All Boilers require a power supply etc and local isolation. The following drawing shows control ideas for the SCB . Compulsory use of the electronic cascade system is required when using a pressurised common flue NOTE: separate flues provide the most efficient operation on any multiple Boiler system. Simple Relay control (using volt free contacts ) of the SCB.( NON ELECTRONIC CASCADE SYSTEM ) The relay makes terminals 13 & 14 in each Boiler.
Control Schemes Note: No power supplies etc. shown All Boilers require a power supply etc. and local isolation. The following drawings show control ideas for the SCB . Only 3 Boilers are shown, up to 12 boilers can be used on the cascade system using a 2 wire bus connection to each Boiler NOTE the compulsory use of the cascade system is required when using a common pressurized flue however separate flues provide the most efficient system. .
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PREPARATION FOR COMMISSIONING THE BOILER First: Flushing the boiler with water After installation of the boiler the first step, before commissioning, is to power flush the whole heating installation with fresh water to remove pollution, debris and other materials that might cause a blocking. Do not flush dirt into the Boiler rinse the Boiler with clean water after the system is fully cleaned. This must also be done with heating installations even where only one boiler is replaced.
Commissioning The gas pressure needed for the boiler to work correctly under full output is a minimum of 20 mbar (to current regulations, if greater) with all plant running. REMINDER Please fill the Syphon. Activate the boiler by pressing the ON/OFF button for at least 5 seconds. After this the following display will appear: Display message Reason H E A T I > > > 1 2 3 : N G : . N o 4 o d e m a n d C ( 1 2 3 . 4 o C ) Boiler is active, but there is no heat demand. 34.
When there is no water present in the boiler or the water pressure is too low/high, the boiler will go into lock-out and will show a corresponding message in the display. By pressing the [SERVICE] button of the boiler, the boiler can be started without a heating demand. The boiler will start to fire and also the pump will start to run. Firing of the boiler without a water flow (but filled with water!) will cause “boiling noises”.
Display message Reason H e a t e x c h a n g a t 9 9 9 , r 5 i s k h r s The max delta temperature T1-T2 has exceeded the blocking temperature more than three times. Set in the parameters P2 CQ-P2 CV (∆T>P2 CV (binnen t=P2 CQ). When this T2-T1 value exceeds the lock-out setting, the boiler will switch off and the following lock out code will be shown at the display.
When the boiler receives a heat demand the electronics will start the operation of the boiler. Before the boiler is used, the boiler burner must be adjusted and set at the minimum and maximum load. ADJUSTING AND SETTING THE BURNER The burner must always be adjusted and set when a new boiler is installed ,a service and maintenance check is done or the gas control safety valve is replaced After the above actions always check the gas/air ratio of the combustion figure (CO 2) at minimum and maximum input.
Setting at the minimum load To start up the boiler in service mode press the [SERVICE] button for around 3 seconds. After that the boiler will start up and when the service mode is activated the following screen will appear. Display message H E A T I N G : > > > 1 2 3 . S e r v i c e 4 o C ( 1 2 3 Reason Boiler is activated and operates at service mode at 26% (minimum). . 2 6 % 4 o C ) Use the [▼] button to increase the actual load of the service (percentage) to the minimum.
INSPECTION AND MAINTENANCE General The boiler requires inspection at least once every 12 months. never use a steel brush during servicing As a rule of thumb, inspection/maintenance is to be carried out also when the boiler generates a number of similar error codes. If used 365 day 24 hr operation the boiler will need checking and servicing more often. Inspection and Service also carry out Maintenance see next page An inspection should cover at least the following matters. a. b.
Maintenance Depending on the outcome of the inspection/service, (preventative) maintenance should be considered as follows. Firstly comments from the user should be taken seriously, then: a. The pressure of the system should be set between 1 and 4 bar unless 6bar version. Find possible leaks in the system and have these fixed. Check that the water additive concentration is in accordance with the manufacturers instructions. b.
SCB Coaxial to Twin Pipe (Parallel) Flue Conversion Kits SCB60 Conversion Kit SCB80 Conversion Kit SCB100 / SCB120 Conversion Kit Part No. EH 6-E61.001.162 Part No. EH 6-E61.001.163 Part No. EH 6-E61.001.
- Flue Resistance Table Page 42
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 1F Albany Park Industrial Estate Frimley Road Camberley Surrey GU16 7PB Tel: Fax: Email: Website: 01276 685 422 01276 685 405 info@strebel.co.uk www.strebel.co.uk We are pleased to inform you that additional information and literature is also available on our website.
