Strebel SC-B Installation, Operating, & Maintenance Instructions
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Strebel SC-B Installation, Operating, & Maintenance Instructions

Strebel sc-b wall-hung condensing boiler
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Strebel SC-B Wall-Hung
Condensing Boiler
INSTALLATION OPERATING & MAINTENANCE INSTRUCTIONS
Version 3.1-Jul/06
Strebel is not liable for any damage caused by incorrectly following these instructions.

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  • Page 1: Sc-B Flue Resistance Table And Example Calculation

    Strebel SC-B Wall-Hung Condensing Boiler INSTALLATION OPERATING & MAINTENANCE INSTRUCTIONS Version 3.1-Jul/06 Strebel is not liable for any damage caused by incorrectly following these instructions.

  • Page 2: Table Of Contents

    6.4. Air Supply & flue gas discharge types 6.5. The air inlet and gas outlet system 6.5.1 SC-B Flue resistance table and example calculation 1 6.5.2 Single & cascade table air inlet resistance 6.5.3 Single & cascade table flue resistance 6.6.

  • Page 3: Example Flue Resistance Calculation

    Page No PUTTING INTO OPERATION 8.1. Control panel, control knobs & L.E.D. 8.2. Sensors 8.3. Run and Fault Codes and Display meanings 8.4. Display buttons 8.4.1 Service Button 8.5. Filling and venting the boiler and system for light up 8.6. Starting the boiler and Commissioning 8.6.1 General...

  • Page 4: Safety Guidelines

    1. SAFETY GUIDELINES Read all these instructions before commencing installation. This appliance is free from any asbestos material. It is the law that all gas appliances and fittings are installed by a competent person (such as a CORGI registered installer) and in accordance with the Gas Safety (installation and Use Regulations), the relevant British standards for installation, codes of practice or rules in force and in accordance with the Manufactures’...

  • Page 5: Typical System Layout

    2. TYPICAL SYSTEM LAYOUTS 2.1 Single Boiler Layout Page 5 of 51...

  • Page 6: Cascade Boiler Layout & Quick Reference

    2.2 Typical Cascade Layout Equipment shown may not be supplied. Please see tender for the actual equipment supplied Page 6 of 51...

  • Page 7: Technical Data S-Cb Boilers

    3. TECNICAL DETAILS General Product Identification Number CE 0063 BP3254 Dimensions (h x w x d) 835 x 458 x 485 890 x 458 x 670 Classification II2H3P Gas Appliance Type B23; C13X,C23X,C33X,C43X, C53X, C63X,C83X Boiler Type S-CB Water content etc. 10,4 12,9 Weight (empty)

  • Page 8: Introduction

    The Strebel S-CB Boiler adjusts to the demand for heat by using flame modulation and external controls. That is on the basis of 1) 0 to 10 volt control. 2) Strebel optimiser control 3) Built in weather compensation with an outside detector. 4) RC or E-BUS .For RC or E-Bus system, see separate booklet.

  • Page 9: Accessories

    5. ACCESSORIES Dependent on the choice of control and hydraulics etc, accessories are available from Strebel at extra cost. See Page 50 for details 6. INSTALLATION OF THE STREBEL S-CB 6.1 Unpacking The Strebel S CB includes the following documents and accessories: •...

  • Page 10: Select The Position Of The Boiler

    6.2 Select the position for the Boiler Select a position in the building with adequate access to the front, side and the bottom of the boiler for future maintenance and servicing. The boiler must have at least 20 mm space at each side. Boiler Type S-CB 60, 80, 100, 120 Co-axial flue is standard supply on 60kw to 100kw Boilers.

  • Page 11: Important Provisions

    Boiler Type S-CB 150 and S-CB 180 150kw and 180kw Boilers are supplied with parallel flue connections an adaptor is available for co axial flue-ing at extra cost Air inlet Flue Parallel Flue Co- Axial Flue D S-CB S-CB 100 /150 130 /150 6.2.1The installation area must have the following provisions: •...

  • Page 12: Mounting The Boiler

    6.3 Mounting the Boiler Prepare the Boiler for mounting as in 6.1.Determine the positions for the flow and return pipes using the suspension bracket 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 onto the bracket or place it upon the frame.
  • Page 13 150/100 *Parallel Roof & wall terminal air inlet/exhaust resistance equals 1 meter straight length of same size Strebel S-CB Example calculation - Boiler type: S-CB 60 S-CB 60 using a co-axial flue system 125/80, with through the roof terminal. For the stated output the boiler has 250 Pa fan pressure...

  • Page 14: Single & Cascade Table Air Inlet Resistance

    6.5.2 Single & Cascade resistance tables of air inlet and flue. The output of the boiler is affected by the resistance of the air inlet and flue system (as a result of controlled gas/air ratios in the Boiler). At a resistance up to 250 Pa, the output will be as indicated on the Boiler data plate.

  • Page 15: Single & Cascade Table Flue Resistance

    6.5.3 Single & Cascade Table Resistance of the Flue in Pa/m SIZE 80mm 100mm 130mm 150mm 180mm 200mm 250mm Output kW Pa/m Pa/m Pa/m Pa/m Pa/m Pa/m Pa/m 11,5 14,5 17,5 20,5 10,1 10,6 1020 Resistance of the different parts of the inlet system: Bends 90°...
  • Page 16 6.6 Example of a Flue Resistance Calculation Boilers: 4 x 150 kW + 1 x 180 kW; Total 780 kW Horizontal air inlet: 5 meter Vertical air inlet to the roof: 8 meter T-pieces over the boilers Number of bends 90°: Roof terminal: Air inlet: Choosing a diameter of: 180 mm Resistance...

  • Page 17: Condense Water Drain

    Fit the expansion vessel in the return of the central heating system (see page 5 & 6 2.1 and 2.2) Expansion vessels and fill units available at extra cost from Strebel. Page 17 of 51...

  • Page 18: S-Cb Internal Pump

    6.9.3 Internal Pump The pump has a speed regulator adjusted to the highest setting: Do not change this setting! The S -CB has a built-in pump control with a standard 3-minute over run. The pump will work at top speed when heat is required. When heat is no longer required, the pump will continue to run for another 3 minutes.

  • Page 19: Installation Instruction For The Electrician

    Primary Pump on/off control must not be used See below Connector strip Strebel S-CB C = Common HD = Heat Demand/Run LO = Lock Out Heating curve When an outside temperature sensor has been connected, the boiler will respond to the program of weather...
  • Page 20 Diagram Outside temperature versus Flow temperature and the K-factor Flow Temperature K-Factor Flow temperature °C K=3,5 K=2,5 K=1,5 K=0,5 Outside Temperature + Outside Temperature Outside temperature °C Outside temperature °C + Plug Connection Description 1 - 2 Outside When an outside temperature sensor is connected, the boiler will be weather Temperature compensated.
  • Page 21 0 Volt is no heat demand and 10 V is maximum output. The DC supply “+” has to be connected to terminal 11, while the “-“ has to be connected to terminal 12. A Flow Temperature sensor is also required available at extra cost from Strebel 13-14...
  • Page 22 18-19- Remote Fault Through the use of an external power (e.g. BMS, 230 VAC or 24 v), one Volt Free Lock-out and contact closes in a Lock Out condition and the other on Heat Demand. remote signal A BMS, lamp or a buzzer can be connected for Heat demand.

  • Page 23: Polarity Sensitivity

    7.3 Phase sensitivity The S-CB boilers are not phase (polarity) sensitive. 7.4 Fuses Main supply fuse should be 5 Amp, slow blow (Not Strebel supply). On the PCB. Board, there are 3 auto fuses and 1 mains fuse. Fuse nr.

  • Page 24: Electrical Circuit Diagram

    7.6 Electrical circuit diagram 60-80-100- 120 KW SINGLE GAS VALVE 150-180 KW DUAL GAS VALVE PCB with plug numbers Ferrite Article no 7427113 Fig 2; Electrical circuit diagram Page 24 of 51...

  • Page 25: Putting Into Operation

    8. PUTTING INTO OPERATION 8.1 Control panel Available control elements for the user (also see 8.4 and 8.41 on page 28) Control Console 1. Pressure Gauge – 0 to 6 bar .Filling pressure minimum: 0.5 bar. 2. Control knob with indication: “CH”- Setting maximum Flow temperature With this knob, the max flow temperature of the Central Heating can be adjusted even when using 0 to 10 volt control.

  • Page 26: Sensors

    DHW temperature (if fitted). S6 = The outside temperature sensor (if fitted). NOT USED. The sensors used in the Strebel S-CB are of the NTC type (negative temperature coefficient) and have the values shown below: Temperature Resistance Sensor 1, 2, 3,...

  • Page 27: Run And Fault Codes And Display Meanings

    8.3 Run and fault Information and Display Meanings Display Two kinds of information may be displayed: a. Display codes Steady and not Flashing on and off. When a code is displayed, it means that there is a heat demand (except the code 0), but the boiler is not working, example, because the temperature is higher than the set temperature.

  • Page 28: Display Buttons

    • Fill water: if desired use X100 (only) additive to the water for the central heating. The pH value should be higher than 5 (if not, we suggest you contact Strebel).Test the water. Use additive as required • Thoroughly flush out the central heating system removing all traces of flux and debris.

  • Page 29: Starting The Boiler And Commissioning

    S-CB 60/80 S-CB 100 / 120 S-CB 150/180 Figure 4; Gas valve(s) Strebel S-CB NOTE: THE SCREW 2 ON THE GAS VALVE BLOCK SCB 60/80/150/180 IS THE SMALL SCREW AS SHOWN 8.6.2 Boiler Commissioning Light Up •...
  • Page 30 IF the setting takes more than 30 minutes the Boiler will return to auto mode. If so, press the SERVICE button again. Also for returning to the normal menu press SERVICE. Set the Boiler via measuring the CO 2 percentage (as shown in the table 4a below), and gas consumption rate. Comment: Measurement of the emissions and CO 2 percentage is via the measuring point in the flue gas pipe, (after unscrewing the plastic cap).

  • Page 31: Setting The Minimum Output

    8.7.2 Setting the minimum output Set the minimum load once the maximum load has been set. In service mode turn the CH knob until the minimum RPM setting has been reached (20 on the display). In order to set or adjust the minimum load, twist the screw [1] for the minimum setting.

  • Page 32: Long Term Shutdown

    9. LONG TERM SHUTDOWN It is recommended to leave the boiler turned on all year round to prevent frost damage in winter and moving parts seizing due to corrosion during other times of the year. To switch the boiler off break the frost protected control circuit (by others) or turn the room thermostat down (minimum power consumption is now assured);...

  • Page 33: Lock Out / User Complaint

    10. LOCK OUT As the burner control goes into Lock Out, the display will show a code (see also 8.3 page 27) which corresponds with the cause of the error; the table below shows the errors. Only by pressing the “Reset-button” the boiler can be reactivated. Meaning Code on Possible cause of the Lock Out...

  • Page 34: Troubleshooting

    11. TROUBLESHOOTING 11.1 Cause of the fault The faults listed on page 33 may have the following causes. Table 6 : Causes of faults Room thermostat incorrectly connected. Room thermostat not turning off, short-circuit in cable. Sensor causing short-circuit in cable or internally. Pump not running;...
  • Page 35 Causes of faults table (cont’d) Setting of the RPM switch of the pump is too low. Sensors changed around (return sensor -S2 and hot water sensor S5). Fuse F1.Automatic re set Fuse F2 Automatic re set Line voltage 230 VAC. Parameter(s) in the installer program entered incorrectly.

  • Page 36: Troubleshooting Table

    11.2 Troubleshooting table Numbers are corresponding with Table 7 Table 7: Troubleshooting table Check cable or replace the cable, check that the cable is connected to the correct connector strip. Replace room thermostat or cable: has the correct thermostat been used? Replace sensor or find cable fault.
  • Page 37 Troubleshooting table (cont’d) Remove the burner control from the boiler by: Removing the ignition cable from the electrode and remove the cable from the console b. Removing the wiring from the spiral – 1X2-pole plug, 1X8-pole plug and the 230V-plug (right side of the front).

  • Page 38: Inspection And Maintenance

    12 INSPECTION AND MAINTENANCE 12.1 General The boiler requires inspection at least once every 12 months. As a rule of thumb, inspection/maintenance is to be carried out when the boiler generates a number of similar error codes. 12.2 Inspection (Items J K L Major Service) An inspection should cover at least the following matters.

  • Page 39: Maintenance

    12.3 Maintenance Depending on the outcome of the inspection, (preventative) maintenance should be considered. Reasons may be: ref. a. Comments and notes from the customer should be taken seriously and an effort should be made to find the cause of any deficiencies and problems. ref.

  • Page 40: Scb 60 To 120

    Boilers with a single gas valve: SCB 60 up to 120 kW: - Converting from Nat. gas to LPG: Turn the small "throttle"(see page 29) screw 2 clockwise about nr. 4 half turns. press the service switch (with a pen). The appliance should start: when there is no ignition, open the throttle 2 (anti - clockwise) with about another half turn.

  • Page 41: Scb 150 To 180

    Boilers with a double gas valve: SCB 150 and 180 kW - Converting from Nat. gas to LPG: 1. Disconnect electrically the left hand gas valve, by separating the white plug and contra plug of the left hand gas valve. 2.

  • Page 42: Exploded Views And Spares

    14 EXPLODED VIEW DIAGRAMS Page 42 of 51...

  • Page 43: Burner, Fan, Gas Pipe, Heat Exchanger, Casing S-Cb60 - S-Cb120

    14.1 Burner /fan/gas pipe/heat exchanger/casing S-CB 60 / S-CB 80 / S-CB 100 / S-CB 120 Figure 4; S-CB60 / S-CB80 / S-CB100 / S-CB120 Page 43 of 51...

  • Page 44: 1Spare Parts S-Cb60 - S-Cb120

    14.1 1 Burner /fan/gas pipe/heat exchanger/casing Spare S-CB 60 - S-CB 120 Spare parts S-CB60/120 Duo-Z GB Article-name Order code Article name Order code 1 Front panel Burner control F-910 E04.016.277 4 Seal ring 80 mm E07.004.023 Tube gland siphon 4 Seal ring 100 mm E07.004.024 Tube gland ø38 mm...

  • Page 45: Burner/Fan/Gas Pipe/Heat Exchanger/Casing S-Cb 150 - S-Cb 180

    14.2 Burner/fan/gas pipe/heat exchanger/casing S-CB 150 – S-CB 180 Figure 5; S-CB150 / S-CB 180 Page 45 of 51...

  • Page 46: Spares Parts

    14.2.1 Burner/fan/gas pipe/heat exchanger/casing Spare S-CB 150 – S-CB 180 Spare parts S-CB150-180 Duo-Z GB Article name Order code Front panel Seal ring 130 E07.004.025 Air inlet connection 130 E01.008.004 52a Gasket air inlet connection 162/135 Automatic air vent E04.015.008 NTC sensor E04.016.287 Insulation burner chamber...

  • Page 48: Spare Parts S-Cb60 - S-Cb120

    14.3.1 Pipes + pump Spare S-CB 60 – S-CB 120 Spare parts S-CB60/120 Duo-Z GB page 3 Article name Order code Check valve ¼"x¼" E04.015.005 Pump complete E04.016.298 91a Pump motor E04.016.310 91b Pumphouse 130 mm E04.015.064 Drain 3/8" E04.008.002 Page 48 of 51...

  • Page 49: Pipelines & Pumps S-Cb150 - S-Cb180

    14.4 Pipes + pump S-CB 150 / 180 Figure 6; S-CB 150 / S-CB 180 Page 49 of 51...

  • Page 50: 1Spare Parts S-Cb150 - S-Cb180

    14.4.1 Pipes + pump Spare S-CB 150 – S-CB 180 Spare parts S-Cb150/ 180 Duo-Z GB Article name Order Code 100 Pump complete E04.016.288 100a Pump motor E04.016.311 100b Pumphouse E04.015.065 101 Drain 3/8" E04.008.002 102 Pressure gauge 6 bar E04.015.062 103 Flange with thread 50-2"...
  • Page 51 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 Page 51 of 51...

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