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Summary of Contents for Strebel S-CBX 85
- Page 1 STREBEL S-CBX Boiler Range Models 85 - 105 - 125 - 155 Wall Hung High Efficiency Condensing Boiler Installation, Operating & Maintenance Manual Please read and understand before commencing installation and leave the manual with the customer for future reference.
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Page 3: Table Of Contents
OCATION OF VERSION NUMBERS 3.2.1 Technical specifications datasheet ................9 ................... 11 PECIFICATIONS ATASHEET DIMENSIONS & CONNECTIONS ...................... 12 S-CBX 85 & 105 ........................12 S-CBX 125 ..........................13 S-CBX 155 ..........................14 ACCESSORIES AND UNPACKING ....................15 ......................... 15 CCESSORIES ..........................15 NPACKING INSTALLATION OF THE S-CBX ....................... - Page 4 9.5.1 Air contamination ......................32 ....... 33 ROPER VENT INSTALLATION AND TYPE OF GAS VENT OR VENT CONNECTOR ..............34 OILER CATEGORIES TYPES OF FLUE GAS SYSTEMS ........................38 CERTIFIED ............39 IPE HEIGHTS AND MUTUAL DISTANCES ON A FLAT ROOF 9.10 ....................
- Page 5 14.1 ........................85 OILER HISTORY 14.2 ..............85 OILER HISTORY AND TIME STAMPS OILER ISTORY 14.3 ........................86 OCKOUT CODES 14.4 ........................89 LOCKING CODES 14.5 ..........................91 ARNINGS 15 CASCADING ............................92 15.1 ........................92 YSTEM SETUP 15.2 .
- Page 6 22.11 L ....................... 131 ANGUAGE SETTING 22.12 A ......................131 VAILABLE ENU ITEMS 22.12.1 Central Heating (CH) ....................132 22.12.2 Domestic Hot Water (DHW) ..................132 22.12.3 Information ........................ 132 22.12.4 Software Versions ..................... 132 22.12.5 Boiler Status ......................132 22.12.6 Boiler History ......................
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Page 7: Introduction
The user (see chapter 22). ▪ Strebel Ltd are not accountable for any damage caused by incorrect following these instructions. For service and repair purposes use only original Strebel Ltd spare parts. All documentation produced by the manufacturer is subject to copyright law. -
Page 8: Technical Data For S-Cbx Boilers
3 TECHNICAL DATA FOR S-CBX BOILERS 3.1 Functional introduction The S-CBX boilers are central heating boilers with a maximum high efficiency. Such a performance can be reached by, amongst other things, using a special heat exchanger made of stainless steel. This allows the flue gases to cool down below the condensation point, and so release extra heat. -
Page 9: Technical Specifications Datasheet
Classification II2H3P Gas Appliance Type B23(P), C13, C33, C43, C63, C83, C93, C(10)3, C(11)3, C(12)3, C(13)3, C(14)3, C(15)3 Boiler Model S-CBX 85 S-CBX 105 S-CBX 125 S-CBX 155 Dimensions (h x w x d) 845 x 440 x 530 Water content estimated litre 10.4... - Page 10 Boiler Model S-CBX 85 S-CBX 105 S-CBX 125 S-CBX 155 EMISSION Values min-max: 7.9 – 8.4 7.9 – 8.4 7.9 – 8.4 7.9 – 8.4 flue gas G25.3 8.4 – 8.2 8.4 – 8.2 8.4 – 8.2 8.4 – 8.2...
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Page 11: Erp Specifications Datasheet
3.3 ErP Specifications Datasheet Technical parameters according to the European ERP (Energy Related Products) legislation: Type Boiler: S-CBX 85 S-CBX 105 S-CBX 125 S-CBX 155 Condensing boiler: Low temperature boiler: B11 boiler: Cogeneration space heater: Combination heater: Unit: Value Value... -
Page 12: Dimensions & Connections
4 DIMENSIONS & CONNECTIONS 4.1 S-CBX 85 & 105 Twin Pipe Concentric / Coaxial Connections Twin Pipe Concentric BSP 1” Flow BSP 1” Return Condensate Flexible hose Ø 25/21 mm BSP ¾” 100 mm 100-150 mm Flue gas 100 mm... -
Page 13: S-Cbx 125
4.2 S-CBX 125 Twin Pipe Concentric / Coaxial Connections Twin Pipe Concentric BSP 1” Flow BSP 1” Return Condensate Flexible hose Ø 25/21 mm BSP ¾” 100 mm 100-150 mm Flue gas 100 mm 100-150 mm Air inlet... -
Page 14: S-Cbx 155
4.3 S-CBX 155 Twin Pipe Only Connections Twin Pipe BSP 1¼” Flow BSP 1¼” Return Condensate Flexible hose Ø 25/21 mm BSP 1” 150 mm Flue gas 150 mm Air inlet... -
Page 15: Accessories And Unpacking
External flow temperature sensor for system side of the low loss header: E04.016.304 10kOhm@25°C Calorifier Temperature Sensor: 10kOhm@25°C E400277 Boiler Circulating Pump for S-CBX 85 & 105 S022.500.011 Boiler Circulating Pump for S-CBX 125 S022.500.012 Boiler Circulating Pump for S-CBX 155 S022.500.013... -
Page 16: Installation Of The S-Cbx
6 INSTALLATION OF THE S-CBX 6.1 Installation Clearances On all sides of the boiler at least 50 mm of clearance should be applied to walls or wall units, 300 mm above the top side of the boiler and 250 mm from the bottom/pump of the boiler. Clearances to wall, ceiling and floor in mm A: Front B: Top... -
Page 17: Mounting The Boiler
The boiler must be positioned and installed by a skilled installer in accordance with all applicable standards and regulations. Commissioning of the boiler must be done by a skilled service/commissioning engineer, who is trained for this type of boiler. 6.3 Mounting the boiler Before mounting and installing the boiler the following connections should be considered: •... -
Page 18: Connections
7 CONNECTIONS 7.1 Boiler connections 1 – Flow (Hot water out) 2 – Return (Cold water in) 3 – Gas 4 – Condensate trap cleaning point 5 – Condensate drain 6 – Automatic air vent. 3 4 5 6 Strain on the gas valve and fittings may result in vibration, premature component failure and leakage and may result in a fire, explosion, property damage or serious injury. -
Page 19: Flow And Return Connections
The condensate trap must always be filled to the edge with water, before replacing to the unit. 7.3 Flow and return connections Use T-pieces for externally mounting the pressure relief valve and the boiler bleed valve BOILER for servicing the boiler. We advise to install two service valves in the flow and return pipes underneath the boiler, so the boiler can be isolated from the heating system and eventually... -
Page 20: Non-Return Valve
7.6 NON-Return valve. All S-CBX boilers have a non-return valve installed in the gas-air mixing pipe just before the burner. Flue gas recirculation is prevented by the non-return valve. The prevention of recirculation also reduces standby losses through the flue of the boiler. This creates a higher thermal efficiency. 7.7 Bypass The boiler has no internal bypass. -
Page 21: Installing A Strainer And/Or Dirt Separator
Always install a strainer (water filter) SYSTEM WITH DIRT SEPARATOR and / or a dirt separator on the system WATER side after a low loss header / Strebel DIRT SEPARATOR WATER FLOW TO LLH / RETURN FROM boiler guard / plate heat exchanger on... -
Page 22: Use Of Glycol
The pH and water quality of the system should be checked on a yearly basis when antifreeze is used in a system. Replace the antifreeze every 5 years or sooner based on the instructions from the manufacturer or if the pH is out of the required range. -
Page 23: Flush The System With Fresh Water
Treatment type Preventive Curative When using chemicals or any kind of additions: Protector F1 Follow the instructions provided by the Cleaner F3 manufacturer. X100 Read the suppliers manual for the X200 maximum allowable level/mixing ratio X300 that can be used with the boiler. Warranty X400 will be void if these instructions are not X500... -
Page 24: De-Air Sequence
7.16 De-Air sequence. The De-Air sequence it is a safety function starting at every power ON and is used to remove the air from the heat- exchanger. The De-Air sequence also starts after a general reset (such as the locking error reset or 24 hours reset) The display will show ‘dAir’... -
Page 25: Water Pressure
7.18 Water pressure The installation should be designed and built to conform to all applicable regulations and standards, including the right safety valves. IMPORTANT: Always keep the pressure in the boiler lower than the value at which its safety relief valve opens. Sensor A water pressure sensor has been built into the boiler. -
Page 26: Example Of A Multiple Boiler Heating Circuit With Low Loss Header
7.19.2 E XAMPLE OF A MULTIPLE BOILER HEATING CIRCUIT WITH LOW LOSS HEADER NON-RETURN VALVE BOILER BOILER (low resistance type) NOT SPRING LOADED HEATING ZONE... -
Page 27: Pump Characteristics
8 PUMP CHARACTERISTICS 8.1 Hydraulic graphs Boiler heat exchanger resistance graph S-CBX 85 HYDRAULIC GRAPH 10.0 FLOW [m BOILER PUMP INSTALLATION ΔT=20K ΔT=25K S-CBX 105 HYDRAULIC GRAPH 10.0 FLOW [m BOILER PUMP INSTALLATION ΔT=20K ΔT=25K... -
Page 28: Modulating Pump For Ch Demand
S-CBX 125 HYDRAULIC GRAPH 10.0 FLOW [m BOILER PUMP INSTALLATION ΔT=20K ΔT=25K S-CBX 155 HYDRAULIC GRAPH 10.0 FLOW [m BOILER PUMP INSTALLATION ΔT=20K ΔT=25K 8.2 Modulating pump for CH demand The control supports PWM modulation for the general pump. The boiler pump is modulated when there is a demand for CH. During any other demand, the PWM pump will run at a fixed speed set by the Default Duty cycle parameter. -
Page 29: Modulating Pump Modes
8.3 Modulating pump modes There are several modulating pump modes implemented in the software. By selecting a different modulating pump mode, the pump behaviour can be changed. The following modulating pump modes are available. Modulating pump mode Details Disabled No pump modulation; the PWM duty cycle is always 0%. Delta temperature modulation Calculated duty cycle to create a delta temperature between the T_Supply and T_Return sensor. -
Page 30: Flue Gas And Air Supply System
9 FLUE GAS AND AIR SUPPLY SYSTEM 9.1 General The boiler has a positive pressure flue system. For a single boiler, the available combined pressure drop for the inlet and outlet system is 200 Pa for the complete boiler range. For a multiple boiler installation, always contact the manufacturer for advice. -
Page 31: Polypropylene
Connecting diameters and tolerances: boiler outside inside insert [mm] [mm] [mm] [mm] S-CBX 85, 105, 125 100 +0,3/ -0,7 101 +0,3/ -0,3 50 +2/ -2 S-CBX 155 150 +0,3/ -0,7 151 +0,5/ -0,5 50 +2/ -2 S-CBX 85, 105, 125... -
Page 32: Air Supply
9.4 Air supply When an air supply duct is connected from the outside of the building to the boiler, the boiler will operate as a room- independent boiler (closed boiler). The air supply duct can be made of PVC, PP or Stainless steel 9.4.1 OMBUSTION AIR QUALITY Combustion air must be free of contaminants. -
Page 33: Proper Vent Installation And Type Of Gas Vent Or Vent Connector
Corrosive Contaminants and Sources Products to avoid: Spray cans containing chloro/fluorocarbons Permanent wave solutions Chlorinated waxes/cleaners Chlorine-based swimming pool chemicals Calcium chloride used for thawing Sodium chloride used for water softening Refrigerant leaks Paint or varnish removers Hydrochloric acid/muriatic acid Cements and glues Antistatic fabric softeners used in clothes dryers Chlorine-type bleaches, detergents, and cleaning solvents found in household laundry... -
Page 34: Boiler Categories - Types Of Flue Gas Systems
9.7 Boiler categories - types of flue gas systems. Type according EN 15502-2-1: 2012 Performance Description Flue outlet Open * Roof terminal Air supply from * Without draught diverter room * Boiler room air supply. * P = overpressure systems See: Typical examples - example C Be aware: The installation room has to have sufficient... - Page 35 Concentric roof terminal Closed * Flue terminal at the roof. Air supply from * Air supply inlet and flue gas outlet located outside at the same air pressure zone (a combined roof terminal e.g.). See: Typical examples - example B concentric/ parallel adaptor C63 - example...
- Page 36 C(4)3 Type C4. A type C appliance connected via its two ducts to a single or a common duct system and for a natural draught. This common duct system consists of two ducts connected to a terminal, which at the same time admits fresh air to the burner and discharges the products of combustion to the outside through orifices that are either...
- Page 37 C(12)3 Type C(12). A type C appliance connected via one of its ducts to a common flue duct system 14). The appliance is connected via a second of its ducts to a terminal, which supplies air to the appliance from outside the building. A type C(12) appliance is designed to become connected to a common flue duct that is designed to operate under...
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Page 38: C63 Certified
C(15)3 Type C(15). A type C appliance that is designed for connection via its flue duct to a vertical terminal and via its air inlet duct to an existing common air inlet vertical duct. The terminal at the same time admits fresh air to the burner and discharges the products of combustion to the outside through orifices that are either concentric or close enough to... -
Page 39: Pipe Heights And Mutual Distances On A Flat Roof
9.9 Pipe heights and mutual distances on a flat roof Height A This is the height of the air inlet. A rain hood should prevent rainwater entering the air supply system. When the air inlet and outlet are mounted on a flat roof, the inlet should be at least 600mm above the roof service and at least 300mm above the maximum snow level. -
Page 40: Flue Terminal Positioning
9.10 Flue Terminal Positioning... -
Page 41: Horizontal Flue Run Risk Assessment
9.11 Horizontal Flue Run Risk Assessment Using the below risk assessment, you can work out if the horizontal flue run is suitable or not. If the flue run is unsuitable then it is recommended to change the terminal position to either a horizontal position which answers “no”... - Page 42 9.11.1 F 12 – IGURE LINE...
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Page 43: Flue Gas And Air Supply Resistance Table
In the next section, for five typical flue gas outlet & air inlet configurations the maximum lengths of the straight pipes will be calculated. First all component resistance values are given in the next table: S-CBX S-CBX S-CBX PARALLEL S-CBX 85 FLUE GAS OUTLET Ø RESISTANCE [Pa] straight tube/m zeta=0 11.3... - Page 44 Boiler S-CBX S-CBX S-CBX S-CBX CONCENTRIC Ø mm CONCENTRIC RESISTANCE [Pa] FLUE GAS OUTLET AIR INLET straight tube/m 45° bend 11.3 90° bend 12.1 18.3 100/150 roof terminal 26.1 37.0 55.7 ROOF wall terminal 12.8 19.2 adaptor straight tube/m 10.5 15.8 45°...
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Page 45: Typical Examples
Concentric pipe for flue gas/air supply (roof-mounted) Concentric pipe for flue gas/air supply (wall-mounted) Be Aware: We used the specific resistance values of Strebel Ltd flue gas and air intake parts for these examples. Other suppliers may have different values! 9.13.1 E... -
Page 46: Example B: Twin Pipe System With Concentric Roof Terminal
9.13.2 E B: T XAMPLE WIN PIPE SYSTEM WITH CONCENTRIC ROOF TERMINAL Calculation example with given lengths: checking resistance Boiler type: S-CBX 125 Diameter: 100 mm Number Pa total Straight tube /m total 30.0 Bend 90° 18.3 36.6 concentric Roof terminal 55.7 55.7 100/150... - Page 47 Air inlet concentric/ parallel adaptor Example B Example A Example A (C63) S-CBX S-CBX S-CBX Boiler Type → S-CBX 85 Diameter air pipe [mm] Diameter flue pipe [mm] Diam. roof terminals [mm] Maximum pipe length (flue & air total pipe length) includes: 4 bends 90°...
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Page 48: Example C: Single Flue Gas Outlet. Air Supply From Boiler Room
9.13.3 E C: S XAMPLE INGLE FLUE GAS OUTLET IR SUPPLY FROM BOILER ROOM Calculation example with given lengths: checking resistance Boiler type: S-CBX 105 Diameter: 100 mm Number Pa total Straight tube m¹ total 42.9 Bend 90° 12.1 24.2 Bend 45°... -
Page 49: Example D: Concentric Flue Gas/Air Supply Pipe (Roof-Mounted)
9.13.4 D: C XAMPLE ONCENTRIC FLUE GAS AIR SUPPLY PIPE ROOF MOUNTED Calculation example with given lengths: checking resistance Boiler type: S-CBX 85 Diameter: 100/150 mm. Pa total quantity Straight tube m total 26.4 Bend 90° 25.5 Bend 45° 10.6... - Page 50 Examples D and E maximum pipe lengths Example D (C33) S-CBX S-CBX Boiler Type → S-CBX 85 S-CBX 155 Diameter concentric pipe [mm] 100/150 100/150 100/150 Concentric roof terminal [mm] 100/150 100/150 100/150 Maximum pipe length POSSIBLE includes: 2 bends 90°...
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Page 51: Cascading
DN150/200 DN200 DN200/300 boiler appliances S-CBX 85 S-CBX S-CBX S-CBX Remark 1: DN 150/200 means: the diameter of the horizontal collector including the bend = 150 mm and after the bend the diameter of the vertical section is 200 mm with an adaptor of 150->200 mm Remark 2: Horizontal length between shaft and last collector = 1 m. -
Page 52: Electrical Installation
11 ELECTRICAL INSTALLATION 11.1 General • For operation, the boiler needs a power supply of 230 VAC 50Hz. • The boiler main supply connection is phase/neutral sensitive. • The wiring for the connections can be entered at the bottom of the boiler through the cable glands. •... -
Page 53: Explanation Of The Low Voltage Connections
11.3 Explanation of the low voltage connections. OUTDOOR SENSOR If an outdoor temperature sensor is connected, the boiler will control the supply water temperature by using a calculated setting based on outdoor reset curve, which is related to the outdoor temperature. SYSTEM SENSOR If a low loss header is used, this sensor measures the flow temperature at the system side. -
Page 54: Explanation Of The High Voltage Connections
11.4 Explanation of the high voltage connections. 1-2-3-PE DIVERTER VALVE DHW indirect tank If an indirect domestic hot water tank is installed, a 3-way valve or a pump (P2) can be used to divert hot water to the heating coil of the tank. This 3-way valve will open, or pump will power on, when the indirect tank has a heat demand. -
Page 55: Ladder/Logic Diagram
11.5 Ladder/Logic Diagram... -
Page 56: Electrical Schematics
11.6 Electrical schematics... -
Page 58: Sensor Availability
11.7 Sensor availability The following table shows the sensor availability for all CH and DHW control modes. Sensors not mentioned in the table are optionally available for other functions CH Mode T_Supply T_Return T_DHW T_Outdoor 0-10 Volt Water Flow DHW RT Switch M = Mandatory, O = Optional, --- = Disabled. -
Page 59: Programmable In- And Outputs
11.9 Programmable in- and outputs It’s possible to re-program some in- and outputs to other functions. To do this use below list and go to: Menu\settings\boiler settings\"1122" (installer password) \boiler parameters boiler parameter name default setting description terminal (117) Prog. Input 2. DHW flow switch LV 16-17 (118) -
Page 60: Burner Controller And Display
12 BURNER CONTROLLER AND DISPLAY. 12.1 Display and buttons On / off switch. Switches electrical power to the boiler Connector for computer cable Reset lockout error Main Menu Escape / Return to the status overview Right Enter a menu item or confirm selection in Status overview (when directly setting Actual setpoint or DHW setpoint) Left Return to previous menu item or Status overview... -
Page 61: Display Icons
12.1.1 D ISPLAY ICONS The following table gives a short description of the icons that can be visible on the main screen during operating: Icon Description Boiler Status CH control state RT_Input Central Heating demand (Central Heating controller (Room thermostat open of state) closed) 0 = Idle... -
Page 62: Entering The Menu
12.2.2 E NTERING THE MENU Enter the menu by pressing the MENU button once. The header in the display shows you are inside the main menu. While scrolling through the menu you will see that the selected menu item is shown in a white rectangle. Central Heating (CH) Domestic Hot Water (DHW) Information... -
Page 63: Protected Menu Items
12.2.3 P ROTECTED MENU ITEMS Some menu items are protected and only accessible via a password* The following password screen will then appear: Users are only allowed to change parameters not needing a password. Installers have to use the password 1122 to change parameters protected by a password. -
Page 64: Boiler History
12.3 Boiler history The boiler history found in the information menu displays several history counters that keep track of the boiler usage. The history cannot be erased and will continue for the burner controller life cycle. The following boiler history data is available: (Sub) Menu item Description Successful Ignitions... -
Page 65: General
The error log screen will show on the first line: Boiler ID for which boiler the error was detected (cascade system only), Error Code, (internal) Error Number, Error Type (Lockout/Blocking). The second line will show the Error Description. The bottom line will show the Time Stamp (date and time) when the error was detected (in the format as configured in the Date Time Settings menu), and also the selected error index from the total number of errors in the (filtered) error log. -
Page 66: Appliance Selection
*Ignition speed is the same as Pre-Purge Speed and Post Purge speed. The following appliances are available: PCB 1 – S-CBX 85 & 105 Appliance type 50 – S-CBX 85 on Natural Gas. Appliance type 51 – S-CBX 85 on LPG. Appliance type 52 – S-CBX 105 on Natural Gas. -
Page 67: Flame Detection
12.6.1 F LAME DETECTION When the boiler is firing, and the flame is not detected anymore, the gas valve will be closed, and the control will perform a post-purge, after which a restart will take place. When the flame disappears three times within one heat demand, the control will lockout. The presence of a flame is measured through the flame rod that points into the flame. -
Page 68: Control Functions
12.7 Control functions Dependent on the required functions of the appliance and connected sensors and components, several operation modes for Central Heating (CH) and Domestic Hot Water (DHW) can be selected. 12.7.1 R ; CH 0 (D OOM THERMOSTAT ONLY MODE EFAULT SETTING For this mode the CH mode should be set to 0 and no outdoor sensor is needed. -
Page 69: Ch With An Outdoor Temperature Reset And Thermostat; Ch Mode 1
12.7.2 CH THERMOSTAT; CH WITH AN OUTDOOR TEMPERATURE RESET AND MODE If the parameter CH_Mode is set to 1, the “Outdoor temperature reset with room thermostat” mode is selected. This mode will only function when an outdoor temperature sensor is connected. If the outdoor sensor is connected, the boiler automatically uses Reset_Curve_Boiler_Maximum. - Page 70 Setpoint adjustment It is possible to adjust the calculated setpoint with parameter CH_Setpoint_Diff. The calculated setpoint can be increased or decreased with a maximum of 10 ºC (18 °F). The CH setpoint limits (Reset_Curve_Boiler_Minimum and Reset_Curve_Boiler_Maximum) are respected while adjusting the setpoint. Apart from the calculated setpoint the functionality is the same as described in chapter 12.7.1.
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Page 71: Ch With Constant Circulation System Outdoor Reset; Ch Mode 2
12.7.3 CH RESET; CH WITH CONSTANT CIRCULATION SYSTEM OUTDOOR MODE When CH_Mode is set to 2, full weather compensator is chosen. For this mode an outdoor sensor has to be connected. The CH_Setpoint is calculated on the same way as described in chapter 12.7.2. However, the demand does not depend on the Room Thermostat input but on the outdoor temperature and the outdoor reset setpoint. -
Page 72: Central Heating With Analogue Input Control Of Setpoint; Ch Mode 4
12.7.5 C ; CH ENTRAL EATING WITH ANALOGUE INPUT CONTROL OF SETPOINT MODE CH mode is set to 4. In this mode of operation, the boiler CH setpoint is controlled by an analogue input signal provided by a remote means such as a Building Management System or a system controller. The analogue input 0-10 VDC is used to adjust the boiler setpoint between the CH_Setpoint_Min and the CH_Setpoint_Max settings. -
Page 73: Ch With Analogue Input Control Of Power Output; Ch Mode 5
12.7.6 ; CH WITH ANALOGUE INPUT CONTROL OF POWER OUTPUT MODE In this mode of operation, the boiler power (boiler input) is controlled by an analogue input signal provided by a remote means such as a Building Management System or a system controller. The analogue input 0-10 VDC is used to adjust the boiler power output between the minimum boiler input and the maximum boiler input settings. -
Page 74: Demand For Domestic Hot Water
12.8 Demand for Domestic Hot Water 12.8.1 N ; DHW OMESTIC ATER MODE No domestic hot water is available. The T_DHW_Out sensor does not need to be connected. 12.8.2 DHW S ; DHW TORAGE WITH SENSOR MODE Mode 1: DHW is prepared by warming up a store. Either a DHW pump or 3-way valve can be used to switch to DHW mode. -
Page 75: Dhw Storage With Thermostat; Dhw Mode 2
The pump continues DHW_Post_Pump_Period. Based on a DHW temperature rise of 50 °C (90 °F) following minimum and maximum DHW flows are advised: Boiler model Minimum flow (litre/ min) Maximum flow (litre/ min) S-CBX 85 23.5 S-CBX 105 27.9 S-CBX 125 34.3... -
Page 76: Anti-Legionella Protection
12.8.5 A LEGIONELLA PROTECTION Anti-Legionella protection is enabled for DHW modes with an external tank with a sensor (DHW Mode 1) or for the direct fired water heater (DHW Mode 6 & 7) and when DHW is not switched OFF. To prevent legionella a special function is implemented in the software. -
Page 77: Display Menu Structure Summary
12.8.6 D ISPLAY MENU STRUCTURE SUMMARY Menu Structure Display: Access Description: level 1. Central Heating (CH) User Enter the Central Heating (CH) menu 2. Domestic Hot Water (DHW) User Enter the Domestic Hot Water (DHW) menu 3. Information User Enter the Information menu 4. - Page 78 3.2 Boiler status min. max. Default unit Access Description: level Flow Temperature °C User Actual supply flow temperature Flow 2 Temperature °C User Actual supply 2 flow temperature Return Temperature DHW Temperature °C User Actual DHW temperature DCW Temperature °C User Actual DCW temperature Outside Temperature...
- Page 79 4.1 General settings min. max. Default unit Access Description: level 4.1.1 Language User Enter the Language menu 4.1.2 Unit Type User Enter the Unit Type menu 4.1.3 Date & Time User Enter the Date & Time menu 4.1.4 Cascade Mode User Enter the Cascade Mode menu 4.1.5 Other Settings...
- Page 80 4.2 Boiler settings min. max. Default unit Access Description: level 4.2.1 Boiler Parameters installer Enter the Boiler Parameters menu 4.2.2 Module Cascade installer Enter the Module Cascade Settings Settings menu 4.2.3 Boiler Cascade installer Enter the Boiler Cascade Settings Settings menu 5 System test min.
- Page 81 min. max. Default unit Access Description: 4.2.1 Boiler parameters level play DHW Tank Supply Extra Installer Set the DHW tank supply ⁰C setpoint offset DHW Priority Installer Set the DHW priority mode DHW Max. Priority Time min. Installer Set the maximum DHW priority time DHW Pump Overrun sec.
- Page 82 4.2.2 Module Cascade min. max. Default unit Access Description: Settings level play Burner Address Stand Installer Set the cascade burner alone address Permit Emergency Mode Yes/ Installer Enable/disable the cascade emergency mode Emergency Setpoint °C Installer Set the emergency mode setpoint Delay Per Start Next Mod.
- Page 83 4.2.3 Boiler Cascade min. max. Default unit Access Description: Settings level play Boiler Address stand Installer Set the cascade boiler alone address Permit Emergency Mode Yes/ Installer Enable/disable the cascade emergency mode Emergency Setpoint °C Installer Set the emergency mode setpoint Delay Per Start Next Blr 1275...
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Page 84: Temperature Protection
13 TEMPERATURE PROTECTION The difference between Flow temperature and Return Temperature is continuously monitored. A too big difference can indicate a defective pump or a clogged heat exchanger. To protect the boiler, the burner controller reduces the input when the temperature difference ΔT becomes too high: At maximum boiler input ΔT is limited to 35°C (63 °F) - (Hx_Diff_DeltaT_Min ) In between 35°C (63 °F) and 43 °C (77 °F) boiler input modulates between minimum and maximum. -
Page 85: Error Information
14 ERROR INFORMATION. Errors can be divided in three groups: • Manual reset locking errors (can only be reset by the reset button). • Blocking errors (will disappear when error is gone) • Warnings (will disappear when the warning is gone, not stored in the controls e2prom) The boiler pump will continue to run during most locking and blocking error codes. -
Page 86: Lockout Codes
14.3 Lockout codes Lock Error Description Cause Solving code E2PROM_READ Internal software error wrongly reset PCB or replace PCB _ERROR programmed PCB and or display unit or PB IGNIT_ERROR Five unsuccessful ignition no gas, wrongly check gas supply and attempts in a row adjusted gas valve adjust gas valve, reset GV_RELAY_... - Page 87 Lock Error Description Cause Solving code MAX_TEMP_ The external overheat Burner door clixon Check burner door gasket ERROR protection is enabled or the tripped because of and replace burner door T_Supply sensor measures overheating of the gasket and reset clixon on a temp.
- Page 88 Lock Error Description Cause Solving code LWCO_1_ Low water cut off 1 error There is no water in Check if there is enough ERROR the heat exchanger water in the heat exchanger or not electrically if not so fill up the system connected LWCO_2_ Low water cut off 2 error...
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Page 89: Blocking Codes
14.4 Blocking codes Lockout Error Description Cause Solving code WD_ERROR_R Internal software error wrongly reset PCB or replace PCB programmed PCB and or display unit or PB WD_ERROR_R Internal software error wrongly reset PCB or replace PCB programmed PCB and or display unit or PB WD_ERROR_ST Internal software error... - Page 90 Lockout Error Description Cause Solving code LOW_WATER_P Low water pressure, Not enough water Fill up the system and RESSURE_SEN generated when the pressure check if there are any pressure drops below water leakages Minimal Pressure, or when the pressure drops below 0.3 bar (4.5 PSI) WD_COMM_ER Watchdog communication...
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Page 91: Warnings
Lockout Error Description Cause Solving code WD_CONFIG_E Watchdog fan configuration wrongly program- reset PCB or replace PCB RROR setting error med PCB or PB and or display unit FILL_WARNING Error is generated The water refill the system until the immediately when the pressure is below pressure is above 1 Bar or pressure drops below... -
Page 92: Cascading
15 CASCADING 15.1 System setup The boiler controller can control multiple boilers in a cascade setup. A system sensor is necessary to measure the cascade system supply temperature. The sensor is connected to the boiler control. A pump output is also available to run the system pump, as well as an output for the DHW pump. When the CH supply temperature is calculated based on an outdoor sensor, only one outdoor sensor is needed. -
Page 93: Setting Up The Cascade Parameters
15.2.1 S ETTING UP THE CASCADE PARAMETERS Enter the main menu by pushing the menu button now select settings by toggling the up and down arrow and enter settings by pushing the enter button. Now select Boiler Settings Select the Module Cascade Settings Change burner address into Managing or Dependent. -
Page 94: Cascade - Heating Only Managing Boiler
Setting the boiler address: NOTICE Address rules The cascade managing address (parameter 184) must be set to ‘Managing’ on the managing boiler. The cascade depending addresses (parameter 184) must be set in a logical numbered order from 1: Dep. 1, Dep. -
Page 95: Cascade - Domestic Hot Water Settings
15.2.3 – D ASCADE OMESTIC ATER ETTINGS In the installer DHW menu of the managing boiler control the DHW_Mode should be set. Available DHW modes in cascade are mode 1 = sensor or 2 = Control Thermostat (see chapter 12.8 "Demand for Domestic Hot Water"). - Page 96 • Quick Stopping Burners: If the T_System is Hyst_Up_Quick_Stop degrees above the Cascade_Setpoint, the burners are stopped at intervals of Quick_Stop_Next_Depending_Delay, for example 30 sec. Starting and Stopping Burners With a small difference between T_System and the Cascade_Setpoint the call for a start or stop of respectively the next or last depending burner is executed.
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Page 97: Cascade - Power Balance Mode
Relevant variables Specific Parameters Level (Default) Value Range Start_Next_Depending_Delay 2: Installer 200 (sec) 0…1275 Start Delay Time Stop_Next_Depending_Delay 2: Installer 180 (sec) 0…1275 Stop Delay Time Quick_Start_Next_Depending_Delay 2: Installer 50 (sec) 0…1275 Quick Start Interval Quick_Stop_Next_Depending_Delay 2: Installer 30 (sec) 0…1275 Quick Stop Interval Hyst_Down_Start_Burner... -
Page 98: Power Mode = 1 (Minimum Boilers On)
15.2.7 P = 1 (M OWER MODE INIMUM BOILERS ON Power Mode 1 guarantees to have as minimum as possible dependent ON in order to reach the T_System. The modulation of most boilers/burners is forced to 100%, and the last 2 boilers/burners are PID controlled by the setpoint (Cascade_Setpoint) from the managing burner in relation to the system temperature (T_System). -
Page 99: Power Mode 2 - Maximum Burners On
15.2.8 P 2 – M OWER MODE AXIMUM BURNERS ON Power mode 2 is designed to have as many depending burners on as possible. When the average burner power of the active depending burners is above a set minimum power, another burner is started Burner start-up The next burner is started under the following conditions: •... -
Page 100: Boiler Rotation
15.3 Boiler rotation The boiler rotation function can change the start/stop sequence for the cascade boilers. The parameter Boiler_Rotation_Interval sets the number of days after which the sequence is updated. When Boiler_Rotation_Interval is set to 0 boiler rotation is disabled. When the parameter Burner_Rotation_Interval is updated the boiler rotation days left will be initialized to the new Burner_Rotation_Interval setting. -
Page 101: Cascade Error Handling
15.4 Cascade Error handling 15.4.1 C ASCADE ROST PROTECTION Frost protection on a cascade is active on two levels 1. Frost protection for burner cascade The ‘frost protection’ function for a burner cascade is related to the boiler sensor temperatures. When the supply / return temperatures of the managing boiler are below: Cascade_Frost_ Protection: The cascade CH/system pump and the general pump of the managing... -
Page 102: System Test
16 SYSTEM TEST. For testing the system at fixed power rates, a system test can be activated via the Installer menu. Via the system test the boiler can be started without CH or DHW being present. The system test has priority. The following modes are available: System test mode Description... -
Page 103: Commissioning The Boiler
17 COMMISSIONING THE BOILER 17.1 First: flushing the boiler with water After installation of the boiler the first step, before commissioning, is to flush the boiler and the whole heating installation with fresh water to remove pollution, debris and other materials that might cause a blocking. This must also be done with heating installations, where only the boiler is replaced. -
Page 104: Mounting Condensate Trap
17.4 Mounting Condensate Trap When mounting the bottom part of the condensate trap, before commissioning the boiler and/or after maintenance, it must ALWAYS be completely filled with water. This is a safety measure: the water in the condensate trap keeps the flue gases from leaking out of the heat exchanger via the condensate drain. -
Page 105: Adjusting And Setting The Boiler
2) 3) boiler type max load min load max load min load max load min load S-CBX 85, 105, 125 8.4/ 6.0 7.9/ 6.9 8.2/ 6.1 8.4/5.7 10.0/ 5.7 10.0/ 5.7 & 155. 1) All values measured without front door. -
Page 106: Setting Screws Venturi- And Gas Valves: Drawings
18.1.2 S ETTING SCREWS VENTURI AND GAS VALVES DRAWINGS Location of the setting screws: Gas Pressure High Fire: nipple [3] screw [2] Low Fire: screw [1] High Fire: venturi adjustment screw: use hex key 4 mm (5/32 Allen wrench) High Fire: screw [2] Low Fire: gas valve adjustment screw: Torx T40. -
Page 107: Adjustment Procedures
18.2 Adjustment procedures Procedure 1: adjust at High Fire Carry out the next steps: 1. From status screen, press MENU . → "Central Heating/ Information/ Settings/ System Test" 2. Press UP/DOWN ↑↓ to select "System Test" 3. Press CONFIRM to activate the system test. →... -
Page 108: Conversion From Natural Gas To Propane
(LPG). There is one main PCB board that does the S-CBX 85 & 105 on both natural gas and LPG supply and one board that does the S-CBX 125 & 155 on both natural gas and LPG. Detailed below. - Page 109 Installing the orifice (see also picture below): Needed tools: wrench 55 or pipe wrench, Hex key 5 mm and Hex key 4 mm 1. Close the external gas shutoff valve and disconnect the electrical power before opening the boiler. 2. Use a wrench to open the coupling in the gas line in the boiler. The three screws, with which the venturi is mounted onto the fan, can now be removed.
- Page 110 8. To return to the status screen, press ESCAPE or MENU 3 times, or RESET once. PCB 1 Boiler type Fuel Supply appliance type S-CBX 85 Natural Gas S-CBX 85 Propane (LPG) S-CBX 105 Natural Gas S-CBX 105 Propane (LPG)
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Page 111: Start Up Checklist
Installation date Cascade installation (Y/N) (YES/NO) After filling in form please send a copy by e-mail to: Number of boilers salesoffice@strebel.co.uk. Type of boilers in cascade Venting information Direct vent or using combustion air from indoor? indoor / outdoor Air inlet... - Page 112 Water circulation & temperature regulation (for DHW) Piping diameter Total length of straight pipe between boiler & tank Number of elbows Number of tees Temperature rise between inlet and outlet after 5 min. cold-start operating max. power °C / °F Water temperature setpoint Test of Water Flow Switch (DHW)? (Yes/NO)
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Page 113: Inspection, Maintenance And Service
19 INSPECTION, MAINTENANCE AND SERVICE. 19.1 General For a good, safe and long-time operation of the boiler and to maintain warranty it is mandatory to carry out inspection, maintenance and service on the boiler at least once a year. Inspection, maintenance and service of the boiler should also be carried out on the following occasions: •... - Page 114 Water leakage The water pressure of the heating installation should be more than 1.0 bar (21 psi) and at a maximum of 6.0 bar (87 psi) in normal operation. When the water pressure drops below the minimum occasionally, there might be a water leak.
- Page 115 Burner Check the burner surface to see if it has damages, signs of rust and/or cracks. When the burner surface is damaged the burner must be replaced. The burner can be cleaned by using a soft (non-metallic) brush. The dust can be removed with a vacuum cleaner or pressurized air.
- Page 116 Burner door thermostat Needed Tool: Wrench 16 mm. This thermostat is activated if the temperature of the burner door has been too high. In this case, it has to be replaced (spare part). Replacement: - Disconnect the wiring and remove the thermostat. - Tighten the burner door’s thermostat with a torque of 2 Nm.
- Page 117 Fiber braid replacement If the high temp braided rope is damaged and needs to be changed, it has to be replaced by new braids using the method described below. The high temp braided rope is maintained by silicone glue. - Remove electrodes. - Remove the braids by sliding under the periphery a thin tool to loosen the braids and remove it.
- Page 118 Insulation The insulation of the heat exchanger (located on the rear wall inside the heat exchanger and burner door) must be inspected. If this insulation disc shows any signs of (water) damage or degradation it should be exchanged. Also check if there are any indications in the burner room of a high condensate level (caused by a blocked condensate trap) that might have wetted the rear wall insulation.
- Page 119 Install the new insulation: - Put two dots of glue silicone, temperature-resistant (Loctite 5366 or Ottoseal S17), according to the location indicated. - Make sure that the burner is in proper condition, remove any possible insulation residues on the burner. - Put a plastic protection skirt around the burner to protect the insulation from the burner.
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Page 120: Mounting The Burner Door
Gas/air ratio With every service check and/or maintenance of the boiler always check the gas/air ratio by measuring the CO percentage (flue gas) at the maximum and minimum load of the boiler. If necessary, adjust these values. See for information chapter “Adjusting and setting the boiler” chapter 18. Pump (supplied separated from the boiler) Check the electrical parts and the motor of the pump for a correct functioning. -
Page 121: Maintenance Checklist
19.3 Maintenance Checklist Allowing the boiler to operate with a dirty combustion chamber will hurt operation. Failure to clean the heat exchanger as required by the manual and dictated by the operating location could result in boiler failure, property damage, personal injury, or death. WARNING Such product failures ARE NOT covered under warranty Periodic maintenance should be performed once a year by a qualified service technician to assure that all the... -
Page 122: User Instructions
20 USER INSTRUCTIONS After installing and commissioning of the boiler, demonstrate the operation of the entire central heating system to the end-user. The user should be made familiar with all safety precautions of the boiler and the installation. The user should be instructed that service and maintenance of the boiler is required every twelve months. Regular service and maintenance is essential for a safe and proper operation of the boiler. -
Page 123: Installation Examples
21 INSTALLATION EXAMPLES The following schematics present several examples of heating installations: All schematics are purely functional. Safety components, bypass, control devices and so on must be added conform all applicable standards and regulations. WARNING System Example 1 Low Voltage Connections BOILER Name Wire terminal... - Page 124 System Example 3 Low Voltage Connections BOILER Name Wire terminal HEATING Room thermostat 12-13 ZONE outdoor temperature sensor flow temperature sensor low loss header High Voltage Connections boiler pump 4-PE-5 System heating pump 6-PE-7 System Example 4 Low Voltage Connections Name Wire terminal BOILER...
- Page 125 System Example 5 Low Voltage Connections BOILER Name Wire terminal HEATING Room thermostat 12-13 ZONE flow temperature sensor outdoor temperature sensor Tank thermostat or sensor low loss header DHW indirect Tank non-return valve (low resistance type) High Voltage Connections boiler pump 4-PE-5 HWS primary pump 2-3-PE...
- Page 126 System Example 7 BOILER 1 BOILER 2 BOILER 3 BOILER 4 managing depending 1 depending 2 depending 3 HEATING ZONE Low Voltage Connections Name Wire terminal Room thermostat 12-13 outdoor temperature sensor flow temperature sensor Tank thermostat or sensor DHW indirect Tank non-return valve (low resistance type) low loss header High Voltage Connections...
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Page 127: User's Part
22 USER’S PART. This section is written for the user Strebel Ltd is not accountable for any damage caused by incorrect following these instructions. For service and repair purposes use only original Strebel Ltd spare parts. All documentation produced by the manufacturer is subject to copyright law. -
Page 128: Display And Buttons
22.5 Display and buttons On / off switch. Switches electrical power to the boiler Connector for computer cable Reset lockout error Main Menu Escape / Return to the status overview Right Enter a menu item or confirm selection in Status overview (when directly setting Actual setpoint or DHW setpoint) Left Return to previous menu item or Status overview... -
Page 129: Display Icons
22.6 Display Icons Icon Description Central Heating demand Domestic Hot Water demand Indicates that the appliance burner is ON Cascade Emergency Mode active Error notification 22.7 Starting the boiler. If the boiler is not on make sure the gas switch beneath the boiler is open and the power cord is connected to the mains, use the on/off button to switch the boiler on. -
Page 130: Changing The Setpoint And/Or Enabling Ch/Dhw
22.8 Changing the Setpoint and/or Enabling CH/DHW. This can be done directly via the Status overview (as shown above) or via the MENU. When CH is active, you can adjust the Actual setpoint directly on the bottom of the Status overview. When DHW is active, you can adjust the DHW setpoint directly on the bottom of the Status overview. -
Page 131: The Menu (Button)
22.9 The MENU (Button). Enter the menu by pressing the MENU button once. The header in the screen shows you are inside the main menu. Whilst scrolling through the menu you will see that the selected menu item is shown in a white rectangle. At the right, there will be an icon shown, depending on the selected item. -
Page 132: Domestic Hot Water (Dhw)
22.12.1 C (CH) ENTRAL EATING Menu / Parameter Description Value / Unit CH Setpoint Set the CH setpoint °C/°F Outdoor reset Enter the Outdoor Reset menu 22.12.2 D (DHW) OMESTIC ATER Menu / Parameter Description Value / Unit DHW Setpoint Set the DHW setpoint °C/°F DHW Store Setpoint... -
Page 133: Service
22.12.8 S ERVICE Menu / Parameter Description Value / Unit Service history Display the service history Burn hours since last service Display the burn hours since last service hrs. Burn hours till service Display the hours remaining until next service hrs. -
Page 134: Other Settings
22.12.17 O THER ETTINGS Menu / Parameter Description Value / Unit Modbus Address Select the Modbus communication address 0…255 Modbus Stopbits Select the number of Modbus communication stopbits 1 – 2 Startup Settings Select the start-up logo (if enabled) 22.12.18 B OILER SETTINGS Menu / Parameter Description... -
Page 135: Service Reminder
22.15 Service reminder If set, the Service reminder will remind the owner/user of the appliance to service the appliance at a specified Service Interval (Factory setting). When service is not done within the specified time, a Service reminder will be shown on the screen, alternating with the normal status display. The Service Interval can be set as the number of burn hours or the number of operational (appliance is powered) hours. -
Page 136: System Test
22.16 System test For testing the system at fixed power rates, a system test can be activated via the menu. Via the system test the boiler can be started without CH or DHW being present. The system test has priority. The following modes are available: System test mode Description... - Page 138 01276 685405 info@strebel.co.uk www.strebel.co.uk STREBEL LTD RESERVE THE RIGHT TO CHANGE ANY SPECIFICATIONS ON THIS BOILER RANGE WITHOUT NOTICE Further information on our complete product range is available from our website. CAST IRON – CONDENSING – STEEL SHELL – WATER HEATERS – RENEWABLES...
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