Strebel SC-B Installation, Operating, & Maintenance Instructions Download Page 16

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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

Horizontal duct , 5 meter

5 x 5.8

29.0 Pa

Vertical duct, 8 meter

8 x 5.8

46.4 Pa

Bends 90°:x 2

2 x 5.8

11.6 Pa

T-pieces:

x.4

5.8

23.2

Roof terminal

5.8

5.8 Pa

Total

116 Pa

Flue gas exhaust Choosing a diameter of: 180 mm

Resistance

Horizontal flue , 5 meter

5 x 8.4

42.0 Pa

Vertical flue, 8 meter

8 x 8.4

67.2 Pa

Bends 90°: x 2

2 x 8.4

16.8 Pa

T-pieces:

x.4

8.4

33.6

Roof terminal

8.4

8.4 Pa

Total

168.0 Pa

Total resistance of the system : 116 Pa+168Pa = 284 Pa

Total resistance is 284 Pa; higher than 250 Pa,(at which the Boiler output stays the same as stated on the
data plate) therefore according to the table on page

, the output will be lowered by about 3%.

This means, that the total output will be 780 kW – 3% = 756 kW

6.7 Chosing a diameter of 150 mm for the whole 780 kW system,

Air inlet system

: (uses flue material)

Choosing a diameter of: 150 mm

Resistance

Horizontal duct, 5 meter

5 x 15

75 Pa

Vertical duct, 8 meter

8 x 15

120 Pa

Bends 90°: x. 2

2 x 15

30 Pa

T-pieces: x. 4

4 x 15

60 Pa

Roof terminal

15 Pa

Total

300 Pa

Flue

Choosing a diameter of: 150 mm

Resistance

Horizontal Flue, 5 meter

5 x 23

115 Pa

Vertical Flue, 8 meter

8 x 23

204 Pa

Bends 90°: x. 2

2 x 23

46 Pa

T-pieces:

102

Roof terminal

23 Pa

Total

490 Pa

Total resistance: 300+490 = 790 Pa. It is clear, that the resistance is higher than the 250 Pa, even higher than
the

maximum 600 Pa

;

the diameter of 150 mm is too small

Summary of Contents for SC-B

Page 1: ...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: ...nd gas outlet system 12 6 5 1 SC B Flue resistance table and example calculation 1 13 6 5 2 Single cascade table air inlet resistance 14 6 5 3 Single cascade table flue resistance 15 6 6 Example flue resistance calculation 2 16 6 7 Example flue resistance calculation 3 16 6 8 Condense water drain 17 6 9 Central heating material 17 6 9 1 Central Heating circuit 17 6 9 2 The expansion vessel 17 6 9 ...

Page 3: ...version 31 9 LONG TERM SHUTDOWN 32 10 LOCK OUT USER COMPLAINT 33 11 TROUBLESHOOTING 34 11 1 Cause of the fault 34 11 2 Troubleshooting table 36 12 INSPECTION AND MAINTENANCE 38 12 1 General 38 12 2 Inspection 38 12 3 Maintenance 39 13 LPG Settings SCB 60 to 120 40 SCB 150 to 180 41 14 EXPLODED VIEWS AND SPARES 42 14 1Burner fan gas pipe heat exchanger casing S CB60 S CB120 43 14 1 1Spare Parts S C...

Page 4: ...hority recommendations Wiring to the appliance must be in accordance with the IEE BS 7671 Wiring Regulations the Health and Safety Document No 635 The Electricity at Work Regulations 1989 and any local regulations that apply Relevant British standards insofar as the relevant areas that are not covered by these instructions BS 5440 Parts 1 and 2 Flues and Ventilation CP 342 Part 2 1994 Code of prac...

Page 5: ...Page 5 of 51 2 TYPICAL SYSTEM LAYOUTS 2 1 Single Boiler Layout ...

Page 6: ...Page 6 of 51 2 2 Typical Cascade Layout Equipment shown may not be supplied Please see tender for the actual equipment supplied ...

Page 7: ...110 Nominal output at 80 60ºC kW 55 73 90 109 136 163 Nominal output at 50 30ºC kW 15 60 20 80 25 100 30 120 36 150 45 180 Norm efficiency 75 60ºC RAL UZ61 107 107 107 107 107 107 NO x emission RAL 61 mg kWh 15 15 15 15 15 15 CO emission RAL 61 mg kWh 20 20 20 20 20 20 Table 1 Data Boiler control includes Cascade control for up to 8 boilers requires flow temperature sensor at extra cost see item G...

Page 8: ...5 C the boiler needs to have a high efficiency approved stainless steel or plastic flue system Aluminium flue systems are not allowed to be connected to these boilers Adequate drain points must be added to the flue system with a u trap 4 2 Controls 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...

Page 9: ...SET FOR NATURAL GAS G20 On delivery immediately check that the Strebel S CB is complete and without any defects Report any damage immediately to the supplier or Strebel Ltd 1 After removing the carton the easiest way to take the boiler off the pallet is as follows 2 Lift the pallet including the boiler at the side of the flue outlet to a vertical position 3 The boiler has a polystyrene block which...

Page 10: ...20 Co axial flue is standard supply on 60kw to 100kw Boilers Parallel flueing requires an adaptor at extra cost Parallel flueing is standard on the SCB 120 Co axial adaptor available at extra cost Co Axial connection at the rear Separate exhaust and air inlet connections are Flue exhaust at the rear and air inlet at the front S CB Concentric Flue D S CB D 60 80 80 125 mm 100 100 150 mm 120 100 150...

Page 11: ...le to hold the weight of the boiler Both the air supply if room sealed and the flues are to be connected to the outside wall and or the roof see safety guidelines page 4 Install horizontal Flue parts under 1 fall in the direction of the boiler one centimetre for every linear metre complete with extra drain points with a 60mm water trap The installation area must be dry and frost free and conform t...

Page 12: ...t the base of any vertical flue exhaust run 60 mm minimum u traps should be utilized 6 5 The air inlet and flue gas outlet system The Boiler is normally room sealed the casing is airtight with air entering through the air supply connection only Always ensure the casing is placed over the boiler when the boiler is in operation The available pressure for the inlet and flue system is 250 Pa unless da...

Page 13: ... X X 0 5 0 5 1 1 5 45 bend 80 2 5 4 6 5 8 14 X 45 bend 100 1 1 7 2 3 2 4 5 6 45 bend 130 0 2 0 4 0 6 0 8 1 1 5 45 bend 150 X X 0 2 0 4 0 8 1 8 90 bend 80 5 8 12 15 20 X 90 bend 100 2 3 5 4 6 9 X 90 bend 130 0 45 0 8 1 2 1 5 2 3 90 bend 150 X X 0 5 0 7 1 1 1 5 straight tube mt 125 80 8 5 11 5 X X X X straight tube mt 150 100 2 5 4 5 5 8 0 15 20 45 Concentric bend 125 80 4 2 5 5 X X X X 45 Concentri...

Page 14: ...mm Pa m 200 mm Pa m 250 mm Pa m 60 4 1 0 35 90 7 2 0 6 120 10 4 1 0 4 150 15 6 1 5 0 6 180 24 9 2 1 0 5 210 12 2 5 1 4 0 6 240 15 3 1 8 0 7 270 18 4 2 2 0 8 300 21 5 2 6 0 9 330 25 7 3 1 1 0 8 360 8 3 4 1 3 0 9 390 9 3 8 1 5 1 420 10 5 5 3 1 7 1 2 450 12 5 8 2 1 3 480 13 6 3 2 3 1 4 510 14 6 5 2 6 1 5 540 15 7 2 9 1 8 570 16 8 3 3 2 1 600 18 9 3 6 2 3 0 65 630 20 10 3 9 2 4 0 7 660 22 11 4 2 2 5 0...

Page 15: ...90 19 7 4 0 1 4 720 20 5 7 5 4 3 1 5 750 22 8 2 4 6 1 6 780 23 8 4 4 9 1 7 810 24 8 7 5 2 1 8 840 25 9 5 6 1 9 870 26 9 5 6 2 1 900 27 10 1 6 4 2 2 930 28 10 6 6 8 2 3 960 29 12 7 3 2 4 990 30 13 8 0 2 5 1020 31 14 8 8 2 6 Resistance of the different parts of the inlet system Bends 90 equal to 1 meter straight flue of the same diameter Bends 45 equal to 0 5 meter straight flue of the same diameter...

Page 16: ...8Pa 284 Pa Total resistance is 284 Pa higher than 250 Pa at which the Boiler output stays the same as stated on the data plate therefore according to the table on page 12 the output will be lowered by about 3 This means that the total output will be 780 kW 3 756 kW 6 7 Chosing a diameter of 150 mm for the whole 780 kW system Air inlet system uses flue material Choosing a diameter of 150 mm Resista...

Page 17: ...plate heat exchanger This will prevent contamination of the boiler heat exchanger with magnetite If the plastic material is not to the DIN standard failure to provide such separation will void the warranty of any boiler parts relating to water 6 9 1 Central Heating circuit The S CB has no pressure relief safety valve This should be fitted in the flow of the system in close proximity to the boiler ...

Page 18: ... cycle starts as soon as the power supply to the boiler is activated 6 10 Low loss header Low Loss Headers must be used with the S CB Boiler Typical Cascade Layout For Low Loss Header size Flow and Return size see table Low Loss Header Common Flow Return Note to Design Engineer See Quotation for equipment supplied OUTPUT H1 H2 H3 D4 D1 KW mm mm mm inch inch 60 330 370 465 3 1 1 2 80 340 380 480 3 ...

Page 19: ... 19 20 21 22 23 24 25 26 27 28 29 34 35 36 33536 Connector strip Strebel S CB Heating curve When an outside temperature sensor has been connected the boiler will respond to the program of weather compensation but not when 0 to 10 volt control is used Through the parameter menu the heating curve see page 20 can be set to do this use the parameter menu with the interface cable together with a laptop...

Page 20: ... When the outside temperature sensor is not connected the boiler is controlled by the roomstat or On Off control when connected to plug no 13 and 14 3 4 Flow temperature sensor In cascade the flow temperature sensor for the central heating circuit is connected to these terminals and placed directly on the flow to the installation after any low loss header This flow sensor can work in conjunction w...

Page 21: ...ossibilities 1 When no on off control is connected the boiler temperature is controlled by the maximum flow temperature set by the CH Control Knob on the Panel In this case a link has to be used between 13 and 14 When an outside temperature sensor is connected the boiler is controlled through the heating curve which can be shifted with the CH Control knob on the Panel 2 When an On Off Control with...

Page 22: ... 22 23 When a zone 2 circuit low temp is installed the pump for this circuit has to be connected to the terminals N and L2 and the PE to the main PE terminal at the right side of the panel 24 25 26 not used secondary circuit Mixing Valve for zone 2 low temp where the L2 is the Closing hydraulic connection closing when the temperature is rising 27 28 29 HTG Pump Heating pump relay 27 28 30 31 No co...

Page 23: ...180 The total load connected for external diverter valves and or pumps should not exceed a maximum of 255 Watt 1 1A Any external pump should be connected to the boiler via a relay When the total of the connected pumps and valves exceeds 255 Watt these items must be controlled through relays 7 5 Sample Cascade Electrical Layout All items are not used on every installation Notes a When using 0 10 Vo...

Page 24: ...Page 24 of 51 7 6 Electrical circuit diagram Fig 2 Electrical circuit diagram PCB with plug numbers 60 80 100 120 KW SINGLE GAS VALVE 150 180 KW DUAL GAS VALVE Ferrite Article no 7427113 ...

Page 25: ...ck out situation the cause of this Lock out is shown in a code on the display The code is flashing on and off 4 Green LED named Flame When the burner is working and firing properly there is ionisation the LED is green in case there is no Heat Demand the LED is off 5 Press button named RESET When the display is flashing there is a lock out situation by pressing this button the boiler will start aga...

Page 26: ...coefficient and have the values shown below If the CH water temperature rises very sharply the boiler will be blocked by combined action of the supply and return sensors until the water temperature has fallen again Temperature C Resistance Sensor 1 2 3 4 5 7 Ohm Temperature C Resistance Sensor 6 Ohm 0 32550 30 171800 5 25340 25 129800 10 19870 20 98930 15 15700 15 76020 20 12490 10 58880 25 10000 ...

Page 27: ...else F2 condition Not used C5 Wait for cooling down b Codes flashing on and off A code which is flashing on and off will show that the boiler is in a lock out position and will not restart automatically The RESET button needs to be pressed until the flashing lock out code disappears Without any adjustments or repairs to the appliance it is likely that the same lock out will happen again so please ...

Page 28: ... again the RESET button FL temperature Flow temperature rE temperature Return temperature dH temperature Hot water temperature o temperature Outside temperature 8 5 Filling and venting the Boiler and the system in preparation for light up Fill the central heating boiler and the heating system using the appropriate filling method The correct fill pressure is 0 5 bar max 6 bar Pay attention to the f...

Page 29: ...ntrol to a higher value to start the burner for CH 8 7 Adjusting and setting the output or when checking or replacing a new gas control valve Set the valve via measuring the CO2 percentage LPG is set by CO see page 40 41 and gas consumption rate The flue may effect the Boiler output see pages 13 14 and 15 Use this method to set both the minimum and the maximum output first set the maximum output a...

Page 30: ...r unscrewing the plastic cap For gas valve adjustments see illustration on Page 29 Fig 4 5 Gas consumption Boiler S CB 60 S CB 80 S CB 100 S CB 120 S CB 150 S CB 180 Natural gas G20 0 098 m per minute 0 130 m per minute 0 164 m per minute 0 196 m per minute 0 245 m per minute 0 293 m per minute LPG See 40 41 See 40 41 See40 41 See 40 41 See 40 41 See 40 41 Table 4 Maximum settings Type of gas Natu...

Page 31: ... S CB180 you only are allowed to set the gas valve on the right hand side DO NOT ADJUST THE LEFT HAND SIDE GAS VALVE For Gas Valve Adjustment see illustration on page 29 Figure 4 8 8 Gas conversion Converting from Nat gas to LPG Boilers with a single gas valve SCB 60 up to 120 kW See page 40 Boilers with a two gas valves SCB 150 up to 180 kW See page 41 NOTE Set LPG by CO emission Setting LPG CO i...

Page 32: ...ll stop after a short delay If the boiler has to be put out of operation the following action must be taken Close the gas cock Remove the electrical plug from the wall socket or switch off the mains power In the event of possible frost damage drain both the boiler and the system When draining the boiler drain the system first Then open the two drain cocks of the boiler Put the O I switch to positi...

Page 33: ... Parameters incorrectly programmeerd PE Revise programme Burner Control has malfunction nc Switch power off then on No communication in cascade mode nc Check cables to all boilers and Bus address numbers Burner defect H1 Press reset button There are several faults or complaints that the display is unable to convey Some of these faults or complaints are Complaint Cause of the fault see page 34 to 3...

Page 34: ...fect 20 Connecting plug to gas valve connected incorrectly or moist inside 21 Power plug of the pump connected incorrectly 22 Siphon blocked 23 Opening and closing manual de aerator after bleeding 24 Three way valve has been damaged 25 Too much resistance in the flue system or flue system is restricted or blocked 26 Flue system having a leak to the inlet system re circulation of flue gas only in c...

Page 35: ...am of the clock thermostat should start earlier in the morning 55 Flow and return on the boiler have been changed around 56 Cable or plug to the three way valve connected incorrectly 57 Priority sensor S3 not placed correctly or defect 60 Cable harness connectors incorrectly mounted on the PCB 61 Gas safety valve defect 62 After programming using the computer confirms the new settings 63 Incorrect...

Page 36: ...hould fit tightly around the plug pins check the position of the cable socket possibly adjust before the plug slides in 21 Check that the plug s are fitting tightly 22 Open the drain line left hand side of the boiler by unscrewing the cap Keep a jug on hand to catch the amount of water drained Poke through the line using a pen moving left upward and right upward Take the burner unit from the boile...

Page 37: ...eck the mains lead the wall box for voltage main fuse 51 Check the programmed parameters 52 Check the type of room thermostat and the indication on the sticker of the connector strips on the boiler 53 Change the pulse width program see parameter manual 54 Change the wake up times of the clock thermostat 55 Flow is on the left hand side of the boiler return on the right hand side 56 Check three way...

Page 38: ...n the condense siphon and remove any dirt f If a laptop computer is available connect this computer and check the service page for error messages starts and failed successful starting attempts g Fire the boiler on maximum output and measure the output and the CO2 percentage CO on LPG h Fire the boiler on minimum output and measure the output and the CO2 percentage CO on LPG i Note the noise of the...

Page 39: ...t may be the cause of these faults ref g See under h ref h Adjust the gas setting at the gas safety valve as necessary under minimum output ref i If the CH pump has become noisy certainly when the pump has been working for more than five years it is recommended to replace the pump motor as a precaution ref j Never clean the burner itself it is not required If dirt has built up on the inside of the...

Page 40: ... the control panel to the maximum to check the max CO value reset if required the CO to less than 100 ppm with help of the Throttle screw When fitting a new gas valve 1 Open the throttle see page 29 screw 2 anti clockwise completely then turn screw 8 half turns clock wise 2 Press the service switch with a pen The appliance should start if there is no ignition open the throttle anti clockwise about...

Page 41: ...you could get too much CO in the analyser 7 Set the screw 2 to obtain a reading of about 100 ppm CO CO is not important it will be around 9 5 8 Turn the red control knob on the control panel to the left to about 9 O clock 9 Set the screw 2 to obtain about 50 ppm CO 10 Turn the red wheel to the minimum 11 Set the screw 1 to give a CO value less than 10 ppm 12 Turn the red control knob on the contro...

Page 42: ...Page 42 of 51 14 EXPLODED VIEW DIAGRAMS ...

Page 43: ...Page 43 of 51 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 44: ...s outlet 194 150 9 Insulation burner chamber E07 010 098 40 Adapter flue gas outlet 80 80 E01 008 014 10 Heat exchanger 6 3 40 Adapter flue gas outlet 80 100 E01 008 008 10 Heat exchanger 8 4 40 Adapter flue gas outlet 100 130 E01 008 009 10 Heat exchanger 10 6 41 Seal ring 80 mm E07 004 023 11 NTC sensor E04 016 287 41 Seal ring 100 mm E07 004 024 12 Insulation burner door E07 010 093 41 Seal rin...

Page 45: ...Page 45 of 51 14 2 Burner fan gas pipe heat exchanger casing S CB 150 S CB 180 Figure 5 S CB150 S CB 180 ...

Page 46: ...t Electrode E07 001 024 63 Burner 12 6 E04 012 028 63 Burner 15 8 E04 012 029 64 Gasket burner air gas inlet pipe E07 001 029 65 ø5x14 mm Torx screw 66 Air gas inlet pipe 12 6 15 8 E03 010 016 67 M8x8 DIN912 screw 68 Gasket air gas inlet pipe fan A150 68 Gasket air gas inlet pipe fan A180 69 Fan E04 016 290 70 O ring 111x3 NBR E07 002 029 71 Air gas mixing box 72 Gasvalve right E04 016 014 72 Gasv...

Page 47: ......

Page 48: ...mp Spare S CB 60 S CB 120 Spare parts S CB60 120 Duo Z GB page 3 Article name Order code 90 Check valve x E04 015 005 91 Pump complete E04 016 298 91a Pump motor E04 016 310 91b Pumphouse 130 mm E04 015 064 92 Drain 3 8 E04 008 002 ...

Page 49: ...Page 49 of 51 14 4 Pipes pump S CB 150 180 Figure 6 S CB 150 S CB 180 ...

Page 50: ...16 306 2 External Flow temperature sensor after low velocity header 10kOhm 25 C to be wired to the boiler 3 4 E04 016 304 3 Calorifier temperature sensor 10kOhm 25 C to be connected to the boiler 7 8 E04 016 303 4 Conversion set from concentric to parallel flue and air terminal for SCB 60 80 E61 001 158 5 Conversion set from concentric to parallel flue air terminal for SCB80 100 120 E61 001 159 7 ...

Page 51: ...nery 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 ...

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