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Strebel S-CB PX 120 Installation Operating & Maintenance Manual

Wall hung high efficiency condensing boiler
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STREBEL
S-CB PX 120 Boiler
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.
2017-05-01 v1

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  • Page 1 STREBEL S-CB PX 120 Boiler 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. 2017-05-01 v1...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION…………………………………………………………………………………………………..5 Strebel Ltd is not accountable for any damage caused by incorrect following the mounting instructions. 6 For service and repair purposes use only original Strebel spare parts............. 6 1. SAFETY GUIDELINES ..........................6 2. TECHNICAL DATA OF THE STREBEL S-CB PX 120 ................7 2.1.
  • Page 4 8.7.2. Example B: Twin pipe system with concentric roof terminal (C33) ........28 8.7.3. Example C: Single flue gas outlet. Air supply from boiler room ........30 8.7.4. Example D: Concentric flue gas/air supply pipe (roof-mounted) ........31 8.7.5. Example E: Concentric system Wall outlet C13(wall-mounted) ........31 8.7.6.

  • Page 5: Introduction

    AINTENANCE REMINDER FUNCTION 17. MAINTENANCE ............................106 17.1............................. 106 ENERAL 17.2. & ................... 106 NNUAL INSPECTION MAINTENANCE 18. USER INSTRUCTIONS ...........................109 INSTALLATION EXAMPLES .........................110 19. Strebel S-CB PX 120 ..........................114 19.1............... 114 PARE PARTS EXPLODED VIEW AND PART NUMBERS...

  • Page 6: Strebel Ltd Is Not Accountable For Any Damage Caused By Incorrect Following The Mounting Instructions

    The following symbol is used in this manual: Warning: Important information concerning the safety of persons and/or the appliance. Strebel Ltd is not accountable for any damage caused by incorrect following the mounting instructions. For service and repair purposes use only original Strebel spare parts.

  • Page 7: Technical Data Of The Strebel S-Cb Px 120

    2.1. Functional introduction The S-CB PX 120 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. The heat exchanger allows the flue gases to cool down below the condensation point, releasing extra heat. This immediately improves the efficiency considerably.

  • Page 8: Technical Specifications Datasheet

    CE 0063 BP3254 Classification UK II2H3B/P Gas Appliance Type B23, B23P; C13, C33, C43, C53, C63, C83 Type boiler Strebel S-CB PX 120 Water content est. Litre Weight (empty) Dimensions (h x w x d) 842 x 476 x 486...
  • Page 9 EMISSION [EN437] Nominal values at min-max load: G20/G25.3 8,7 - 9,0 9,3 - 10,3 flue gas 9,3 - 10,4 G30/G31 B/P) NOx class [ EN15502-1] Flue gas temperature at combustion air ≈ 85-95 °C temperature = 20°C Mass flow flue gas [min-max] 11,6 - 57,7 condensing fluegas...

  • Page 10: Erp Specifications Datasheet

    2.3. ERP specifications datasheet Technical parameters according the European ERP (Energy Related Products) legislation: Type Boiler: S-CB PX 120 Condensing boiler: low temperature boiler: B11 boiler: Cogeneration space heater: Combination heater: Unit: Value Rated heat output 107,7 P-rated (P4) at 60-80⁰C 107,7 Heat output (p1) 30% at 30-37⁰C...

  • Page 11: Dimensions

    DIMENSIONS Combustion air inlet connection (hole with sealing ring and pipe support bracket) Ø100 Flue gas outlet R 1" (2x) R ¾" Condensate discharge. Flexible hose Ø25/21 x 800 mm Gas supply connection Circulation return connection (Circulation pump side) Circulation flow connection...

  • Page 12: Accessories And Unpacking

    E400157 (Main cable, signal cable with cable gland, and pump gaskets included) 4.2. Unpacking The Strebel S-CB PX 120 boiler will be supplied with the following documents and accessories: • One “Unpacking instructions” document. • One “Mounting, user and service instructions” manual.

  • Page 13: Installation Of The Strebel S-Cb Px 120

    INSTALLATION OF THE STREBEL S-CB PX 120 5.1. General notes At both sides of the boiler at least 50 mm of clearance should be applied to walls or wall units, 350 mm above the top side of the boiler and enough distance from the bottom side of the boiler, so that the pump can be mounted here.

  • Page 14: Mounting The Boiler

    5.2. Mounting the boiler Before mounting and installing the boiler the following connections should be considered: • Flue gas system and the flue gas pipe connections • Air supply system and connections • Flow and return pipe connection and pump position •...

  • Page 15: Connections Water Side

    CONNECTIONS WATER SIDE. Boiler connections 6.1. 1 - Return CH 2 - Flow CH 3 - Siphon cleaning point 4 - Condensate drain 5 - Gas 6.1.1. OUNTING When mounting the connections, always make sure that no extra tension, forces and/or torques are applied to the connecting pipes and/or the boiler and the boiler sus- pension.

  • Page 16: Condensate Drain Connection

    6.2. Condensate drain connection The condensate drain has a 19mm flexible discharge hose. The siphon must always be filled with water. As a safety measure, the siphon has been provided with a floating ball, which closes the outlet in case of water absence, preventing large flue gas leakage.

  • Page 17: The Expansion Vessel

    The external pump must be mounted in the return pipe of the boiler. • The boiler pump must be controlled by the Strebel S-CB PX 120 control. If, for any reason, an external pump control is applied without written approval of Strebel, the complete warranty on the S-CB PX 120 and all supplied parts will become invalid.

  • Page 18: 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 RE- side after a low loss header / Strebel DIRT SEPARATOR WATER FLOW TURN FROM boiler guard / plate heat exchanger on...

  • Page 19: Plastic Piping In The Heating System

    6.11. Plastic piping in the heating system When plastic pipes are used in the central heating system and NOT oxygen diffusion proof to standard DIN 4726, these should be separated from the boiler system by using a plate heat exchanger. Diffusion (through the plastic) can cause air to enter the heating system.

  • Page 20: Water Pressure

    6.14. Water pressure First and for all, the installation should be designed and built conform 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 valve opens. Sensor A water pressure sensor has been built into the boiler.

  • Page 21: Installation Examples

    6.18. Installation examples 6.18.1. XAMPLE OF A NORMAL SINGLE BOILER HEATING CIRCUIT PREFERABLE valve air separator dirt separator strainer (water filter) HEATING ZONE pressure relief valve siphon pump automatic air vent expansion vessel low loss header 6.18.2. XAMPLE OF A MULTIPLE BOILER HEATING CIRCUIT NON-RETURN VALVE (low resistance...

  • Page 22: Hydraulic Graph Boiler Resistance (Mwc)

    HYDRAULIC GRAPH BOILER RESISTANCE (mWC) 7.1. High efficiency pump The boiler software is set on a modulating pump. High efficiency pump ΔT=25K ΔT=20K 10.0 Resistance Boiler Max. Head Pump Water flow (m³/h)  Head for Installation Min Head Pump “Head Pump” characteristic line based on the UPML 25-105PWM pump. In this graph, a minimum and a maximum head for the pump are depicted;...

  • Page 23: Pumps: Electrical Power Limits

    7.2. Pumps: Electrical Power Limits General - The inrush current of a conventional pump is approximately 2½ x its nominal current. - The maximum current, that the relay on the PCB can switch, is 5 A. The conclusion from this is that nominal currents of pumps, which are controlled by the PCB, may not exceed 2 A. Pump P1 - boiler pump.

  • Page 24: Flue Gas Discharge And Air Supply System

    • It is preferable to use roof terminals. Because of the high capacity, using wall terminals on the S-CB PX 120 can give unpleasant large flue gas clouds. When installed correctly, roof terminals in general give a better flue gas dilution with the surrounding air, and a good transport away from the surroundings and the air inlet.

  • Page 25: Flue Terminal

    Multiple boilers can be connected to a common duct. These flue gas systems for multiple boiler installations must always be engineered as zero or negative pressure systems; this to prevent the risk of recirculation of the flue gases. In circumstances where a zero or negative pressure cannot be achieved, please call Strebel Ltd Technical Department for advice.

  • Page 26: Pipe Heights On A Flat Roof

    8.5. Pipe heights on a flat roof Height A This is the height of the air inlet. A rain hood should prevent rain- water entering the air supply system. When the inlet and outlet are mounted on a flat roof, the inlet should be at least 60 cm above the roof surface and at least 30 cm above the maximum snow level.

  • Page 27: Flue Gas Outlet & Combustion Air Inlet Calculation Examples

    8.6. Flue gas outlet & combustion air inlet calculation examples For six typical flue gas outlet & air inlet configurations the maximum lengths of the straight pipes will be calculated. First the general component values are given in the next table: Resistance R [Pa] * twin pipe Ø...

  • Page 28: Six Typical Examples

    The total resistance is less than 160 Pa. This flue gas / air supply system is functional. Be aware: Strebel specific resistance values are used in this example. Flue and air pipes of other supplier can have other values 8.7.2.
  • Page 29 Examples A (C63) and B (C33) maximum pipe lengths Concentric roof terminal concentric/parallel adaptor Flue outlet Air inlet Example B Example A Example A (C63) Boiler type  PX 120 Diameter air inlet [mm] Diameter flue outlet [mm] Diam. roof terminals [mm] Maximum pipe length 15,0...

  • Page 30: Example C: Single Flue Gas Outlet. Air Supply From Boiler Room

    8.7.3. C: S XAMPLE INGLE FLUE GAS OUTLET IR SUPPLY FROM BOILER ROOM Calculation example with given lengths: checking resistance Boiler type: S-CB PX 120 Diameter: 100 mm Number Pa total Straight tube m¹ total 84,5 Bend 45° Bend 90°...

  • Page 31: Example D: Concentric Flue Gas/Air Supply Pipe (Roof-Mounted)

    8.7.4. D: C XAMPLE ONCENTRIC FLUE GAS AIR SUPPLY PIPE ROOF MOUNTED Calculation example with given lengths: checking resistance Boiler type: S-CB PX 120 (C33) Diameter: 100/150 mm. Number Pa total Straight tube m total Bend 90° Bend 45° Concentric terminal...
  • Page 32 Examples D and E maximum pipe lengths concentric roof terminal concentric wall terminal Example D Example E Example D (C33) Boiler type  PX 120 Diameter concentric pipe [mm] 100/150 Concentric roof terminal [mm] 100/150 Maximum pipe length Example E (C13) Boiler type ...

  • Page 33: Example F: Separate Air Supply Duct & Flue Duct In Different Pressure Zone (C53)

    8.7.6. F: S & (C53) XAMPLE EPARATE AIR SUPPLY DUCT FLUE DUCT IN DIFFERENT PRESSURE ZONE Calculation example with given lengths: checking resistance Boiler type: S-CB PX 120 Diameter: 100 mm Number Pa total Straight tube m¹ total Bend 45°...

  • Page 34: Electrical Installation

    The boiler pump must be controlled by the Strebel PX 120 boiler control. If, for any reason, an external pump control is applied without written approval, the complete warranty on the boiler and all supplied parts will become invalid.
  • Page 35 GENERAL BLOCKING A heat demand that will start the burner will be blocked when terminals 7 and 8 are not bridged. This connection is for the use of external safety devices (terminals must be bridged for allowing burner to fire). 9-10 EXTERNAL WATER PRESSURE SWITCH A water pressure sensor is mounted in the boiler.

  • Page 36: Electrical Schematics

    9.4. Electrical schematics internal connections ionisation and/or ignition display ref.1 clixon/maximum (S7) water thermostat 24vdc CN15 fan Hall CN10 fan control fan PWM +24Vdc PWM pump control flow sensor ntc (S1) 10K CN12 CN11 flue sensor ntc (S6) 10K return sensor ntc (S2) 10K water pressure sensor (water pressure switch will be mounted above 4 Bar)
  • Page 37 boiler casing ignition transformer incl. ionisation input. WIRING COLORS K0=white K6=blue K1=yellow K7=red K2=brown K8=black K3=green K9=purple K4=grey K10=yellow/green K5=orange CN not used CN10 LOCK-OUT BURNER HEAT Divertor Valve Calorifier BURNING DEMAND CH System Boiler circulation CASCADE Pump P3 Pump P1 Mains 230 VAC CONNECTION N.O.

  • Page 38: Sensor Values And Conversion Tables

    9.5. Sensor values and conversion tables SENSOR SENSOR TYPE SENSOR VALUE Internal flow sensor NTC-10K-B3977 Internal return sensor NTC-10K-B3977 External flow sensor NTC-10K-B3977 Calorifier/tank sensor NTC-10K-B3977 Outdoor sensor NTC-12K-B3740 Flue gas sensor NTC-10K-B3977 Conversion table: temperature vs. resistance for all sensors with value NTC-10k B3977 ( = all sensors except the outdoor sensor).

  • Page 39: User Interface

    USER INTERFACE 10.1. Control panel / display unit CONTROL PANEL DISPLAY 2 rows/ each 20 characters ON/OFF MENU RESET ENTER SERVICE COMM. PORT Press and hold for three seconds for stand-by/progr. mode ON/OFF Press and hold for six seconds to switch boiler on/off. RESET ENTER Used as RESET and ENTER button when programming.

  • Page 40: Control Panel Menu Structure

    10.2. Control panel menu structure BASE SCREEN: (appears during operation) HEATING: No demand / Standby / burning NOTICE: Pressing too > > > : 1 1 8 ° C ( 1 2 5 ° C ) long will switch off the boiler.
  • Page 41 CONFIRMATION CHANGE When changes have been made in one of the nine menus below, the user presses ENTER to confirm these changes. To prevent customers making changes by accident, the following happens when changes are made: Step 1: The user presses [ENTER] to confirm the change made or [MENU] to exit the menu without changes.

  • Page 42: Display During Operation

    10.3. Display during operation During normal operation, the text in the display shows the status of the boiler. In the following graphs the several displays during normal operation are explained. Display at HEATING DEMAND Heat demand type: Actual status: H E A T I N G : N o d e m a n d >...

  • Page 43: Monitor Screens

    10.4. Monitor screens During normal operation and stand-by, the “◄” and “►” buttons can be used to show some boiler information, including measured temperatures, settings and data. In the following graphs is explained which values can be shown in the display. When no button is activated for 2 minutes the display will return to its status display. Pressing [◄] or [►] while being at the "operating screen"...
  • Page 44 SCREEN: C a s c D e s i g n 0 = MASTER, 1 ..11 = SLAVES C a s I n f 0 1 2 3 4 5 6 7 8 9 A B Displays number, priority and state of cascade boilers. DESCRIPTION "CASCINFO"...

  • Page 45: Service Function

    10.5. Service function The following graphs describe how to use the service function. Operating screen: H E A T I N G : S T A N D - B Y > > > : 1 2 3 . 4 ° C ( 1 2 3 . 4 ° C ) Press [SERVICE] and hold for 3 seconds.

  • Page 46: Schornsteinfeger Function

    10.6. Schornsteinfeger function The following graphs describe how to use the Schornsteinfeger function. NOTICE: This function is required for Germany and can be activated by parameter (P5 BK). The standard factory setting for this function is “OFF”. The purpose of this function is to have an easy interface for the "Schorn- steinfegers"...

  • Page 47: Programming In Standby Mode

    10.7. Programming in standby mode Standby Use the standby mode for modifying boiler settings without interaction with the boiler control. Changes are effectuated by leaving standby mode. Properties of standby mode: • Keys are active and the menu is accessible. •...

  • Page 48: Set Points

    10.9. Set points The following graphs describe how to program the heating and hot water set points. NOTICE: The hot water set points are only displayed, when the boiler is programmed as an indirect hot water boiler or direct hot water boiler. See parameter P4 AA for the exact boiler configuration.

  • Page 49: Setting The Timer Programs

    NOTICE: DHW set point normal/day time: (parameter P4 AA = 1/2) The maximum actual DHW tem- D H W s e t p o i n t perature will never exceed the value set at “Heating Setpoint” ° C regardless the set DHW This is the water temperature set point that is active during setpoint.
  • Page 50 Operating screen: H E A T I N G : b o i l e r > > > : 1 2 3 4 ° C ( 1 2 3 . 4 ° C ) Press [MENU] Select "Timer" using [◄] & [►] and press [ENTER] Main menu screen: M e n u T i m e r...
  • Page 51 HOT WATER PROGRAM > > > From previous page with HEATING part < < < Setting DHW program times: P r o g r a m D H W M o n 2 3 : 0 0 Press [►] to browse through the values that can be set at the bottom line.

  • Page 52: Setting The Outdoor Specifications

    ANTI LEGIONNAIRES' DISEASE PROGRAM The anti-Legionnaires’ disease (pasteurisation) program of the boiler can only be used when the boiler is set as an “indirect” boiler configuration or a “direct” hot water boiler configuration. Only these configurations can activate the day and time program of the anti-Legionnaires’ disease function. See the following graphs. The standard factory setting for this function is “OFF”.
  • Page 53 OUTDOOR GRAPH (see also next page) HEAT CURVE - main settings P5 AD - Flow temp at outdoor temp low P6 BC - Parallel shift P5 AF - Flow temp at outdoor temp high OUTDOOR TEMPERATURE P5 AE P5 AC outdoor temp high outdoor temp low Curve and values only for illustration purposes, programmed parameter values can deviate!
  • Page 54 HEAT CURVE - additional settings P6 BA - max flow temp P6 BB - Heat curve night shift P5 AH - Warm weather shutdown P2 HA - Outdoor sensor hysteresis P5 AG - min flow temp OUTDOOR TEMPERATURE Curve and values only for illustration purposes, programmed parameter values can deviate! P5 AG Heat curve minimum flow temperature °C...
  • Page 55 DISPLAY The following graphs describe how to program the outdoor graph settings. Operating screen: H E A T I N G : b o i l e r > > > : 1 2 3 . 4 ° C ( 1 2 3 4 °...

  • Page 56: Checking The Operating History

    10.12. Checking the operating history The following graphs describe how to check the operating history of the boiler. Operating screen: H E A T I N G : b o i o f f > > > : 1 2 3 . 4 ° C 1 2 3 .

  • Page 57: Checking The Fault History

    10.13. Checking the fault history The following graphs describe how to check the fault history of the boiler. Operating screen: H E A T I N G : b o l e r o f f > > > : 1 2 3 . 4 °...

  • Page 58: Setting The Maintenance Specifications

    10.14. Setting the maintenance specifications The following graphs describe how to check and program the maintenance settings. The standard factory setting for this function is “OFF”. MAINTENANCE SETTINGS The unit can be programmed in such a way that an automatic maintenance message is displayed. There are three options that can be selected.
  • Page 59 From previous page Screen: Selecting message at certain date. M a i n t e n M o d e D a t e Press [►] to set: The date for the maintenance message. Press [◄] to: Return to maintenance mode selection. Press [►] to browse through the values that can be set at the bottom line.
  • Page 60 From previous page Screen: Message after total amount of burning hours. M a i n t e n M o d e B u r n i n g h o u r s Press [►] to set: The total amount of burning hours for the Maintenance message. Press [◄] to: Return to maintenance mode selection.

  • Page 61: Setting The User Lock

    10.15. Setting the user lock The following graphs describe how to activate the user lock of the display. The standard factory setting for this function is “OFF”. The "USER LOCK" menu. In this menu the boiler can be locked for (end-)users. 0 = UNLOCKED 1 = LOCKED When the boiler is unlocked, the user can enter the...

  • Page 62: Setting The Parameters With The Display Menu

    10.16. Setting the parameters with the display menu The functions of the controller are embedded in de electronics by means of parameters. The values and settings hereof can be programmed by a skilled and trained service engineer with the help of a computer (laptop), the correct software and an interface cable.
  • Page 63 Operating screen: The screen texts on these H E A T I N G : b o i o f f pages are standard part of > > > : 1 2 3 . 4 ° C ( 1 2 3 . 4 ° C ) the software and apply to systems (boilers)
  • Page 64 Menu A: Heating The screen texts on these c P r b pages are standard part of the software and apply to ° C systems (boilers) Select the cascaded boilers supply temperature control. and/or DHW devices (wa- This parameter is the proportional range of the selected CH ter heaters).
  • Page 65 Menu B: Hot water The screen texts on these L e g i o t e m p pages are standard part of ° C the software and apply to systems (boilers) Pasteurisation function of the boiler. This parameter is the se- and/or DHW devices (wa- lected hot water temperature during the pasteurisation func- ter heaters).
  • Page 66 Menu B: Hot water The screen texts on these D H d s c l n t 2 3 pages are standard part of 2 0 0 S e c the software and apply to systems (boilers) Function for the direct hot water boiler. and/or DHW devices (wa- This parameter is the integration time of the selected HW tem- ter heaters).
  • Page 67 Menu C: Cascade Function for the cascading of the boiler(s). This parameter is activated when an external (extra) boiler is connected to the Master boiler. Connect to the Master connec- tions 19-20. Menu C: Cascade C a s / M a Function for the cascading of the boiler(s).
  • Page 68 Menu D: General The screen texts on these M a x C o o l T pages are standard part of the software and apply to Function for setting the maximum overrun time of the fan (max- systems (boilers) imum 10 minutes). and/or DHW devices (wa- 0 = Switch off ter heaters).

  • Page 69: Fault Codes Display

    10.17. Fault codes display The following graphs describe the lock out codes of the boiler. A lock out code can only be removed by a manual resetting of the boiler. NOTICE: Before resetting the boiler always check the boiler, central heating system and all components corresponding to the related lock out description.

  • Page 70: Blocking Codes

    a m / Display message p u m p 9 9 9 Reason Fault during programming of the boiler software parameters. a m m i e n d Display message p u m p 9 9 9 Reason Software parameters have been programmed. Display message T e m p p u m p...

  • Page 71: Maintenance Attention Messages

    Display message e m p 9 9 9 Reason Flue gas temperature has exceeded the limit. Display message G e n o c k 9 9 9 Reason The general blocking circuit is activated during operation = contact 7-8 Display message 9 9 9 Reason Wrong electrical power supply is connected (not 50 or 60 Hz, 220-240 Volt).

  • Page 72: Controlling Options And Settings

    By each setting, the relevant Soft start settings are automatically adjusted, depending on its main setting P4BE, see next section § 11.1.6. Remark: For the S-CB PX 120 it is not necessary to use P4BD because the air restrictor kit for propane/butane must be used.

  • Page 73: Soft Start Option

    Do not use (reserved for future applications). The boiler pump must be controlled by the Strebel S-CB PX 120 boiler control. If, for any reason, an external pump control is applied without written approval, the complete warranty on the boiler and all...

  • Page 74: Heating

    Heating The following chapters describe the different functions of the boiler and their related “controlling behaviour settings” as a central heating boiler. 11.1.8. ONTROLLING BEHAVIOUR SETTINGS The factory settings for all heating applications are working fine and it is therefore advised not to change these settings.

  • Page 75: Room Thermostat On/Off

    11.1.9. OOM THERMOSTAT ON A room thermostat with a fixed set point and using an ON/OFF control can be connected to the boiler (connections 11-12). Changing the flow temperature set point and activation of a timer program can be done by this room ther- mostat or by programming the boiler settings.

  • Page 76: Vdc Remote Burner Input Control

    11.1.13. 0-10 V EMOTE BURNER INPUT CONTROL The burner input is controlled by connecting an external 0-10 Vdc signal to the boiler (connections 13-14). P5 BB Analogue input Config (0=off 1=temp 2=power) (display D1). This parameter must be set at "2" so the supplied 0-10V dc signal will control the burner input. The standard factory setting is “1”, temperature set point control.

  • Page 77: Indirect Hot Water / Calorifier

    11.2. Indirect hot water / calorifier The following chapters describe the different functions of the boiler and their related “controlling behaviour settings” as a central heating boiler with an indirect hot water function. 11.2.1. UMP AND WAY VALVE CONTROL See chapter 0 for several installation examples of the boiler and the preferred functions. When the boiler is used as an indirect boiler for both central heating and hot water function, this hot water function can be activated by using a DHW pump or a 3-way valve.

  • Page 78: Low/High Flow Temperature To Tank Coil

    11.2.4. HIGH FLOW TEMPERATURE TO TANK COIL This function can only be used for an “indirect” programmed boiler (parameter P4 AA = 1). Normally for a regular calorifier a fixed flow temperature of 85°C is supplied to the calorifier heat exchanger in case of a heat demand.

  • Page 79: Heating And Hot Water Switching Time

    11.2.5. EATING AND HOT WATER SWITCHING TIME This function can only be used for an “indirect” programmed boiler (parameter P4 AA = 1). In case there is a heating demand and the unit is operating for this heating demand, also a hot water demand can be activated.

  • Page 80: Anti-Legionnaires' Disease Function (Pasteurisation)

    ’ 11.2.7. EGIONNAIRES DISEASE FUNCTION PASTEURISATION This function can only be used for an “indirect” programmed boiler (parameter P4 AA = 1), on which a DHW program is active. To prevent Legionnaires' disease the boiler (software) provides a function for heating up the hot water storage tank (once a week) to a higher water temperature then the normal active hot water set point.

  • Page 81: Cascade Control

    Changes in parameter may only be carried out by a skilled commissioning/service engineer, who has had specific training for setting up the Strebel S-CB range boilers. He will be able to check whether the installation functions correctly after the parameter change has been done.
  • Page 82 PARAMETERS PARAMETERS PARAMETERS PARAMETERS P5DF = 1 P5DF = 0 P5DF = 0 P5DF = 0 P5DA = 0 P5DA = 1 P5DA = 2 P5DA = 3 Boiler Ketel Ketel Ketel Ketel Boiler Boiler Boiler Master Master Slave 1 Slave 2 Slave 3 Slave 1...

  • Page 83: Monitor Screens

    When cascade connection is programmed correctly the boiler display will show the following. Explanation "Cascade communication indicator" NO CASCADE COMMUNICATION > > > no.1 Always showing the fixed ">>>" CORRECT CASCADE COMMUNICATION > > no.1 > no.2 Showing alternating no.1 & no.2 with 1 second interval. 11.3.2.

  • Page 84: Commissioning The Boiler

    COMMISSIONING THE BOILER 12.1. First: flushing the boiler with water After installation of the boiler the first step, before commissioning, is to flush the whole heating installation with fresh water to remove pollution, debris and other materials that might cause a blocking with the S-CB PX isolated from the system.
  • Page 85 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 the so called “boiling noises”.

  • Page 86: Starting The Boiler

    The graph shows the position of the pressure nipple (3) for the boiler: AMBASSADOR Q Strebel S-CB PX 120 13.2. Firing for the first time After the commissioning of the boiler and the described previous actions, the boiler display will show the following graph.

  • Page 87: Adjusting And Setting The Burner

    ADJUSTING AND SETTING THE BURNER Before carrying out any adjusting of the burner, carefully read this complete chapter. 14.1. Introduction The burner must always be adjusted in the next situations: - A new boiler is installed - As part of a service/maintenance check, in case the CO values turn out to be incorrect.

  • Page 88: Adjustment Values

    14.1.2. DJUSTMENT VALUES To make adjustments easier, values of table 1 are presented in the following figures. The CO values should always be between the values set in this figure. Nominal values can be found in the Technical specifications table at the beginning of this manual. All values are measured without front door.

  • Page 89: Setting Screws Gas Valve: Drawing

     Screw 2 is the SMALL screw immediately next to the pilot screw. Number 3 is the gas pressure in- put measuring nipple. AMBASSADOR Q Strebel S-CB PX 120 Table 2 pre-adjustment settings gas valves (G27 for Poland) number of turns open (counter clockwise) Boiler...

  • Page 90: Adjustment Actions General Scheme

    14.1.4. DJUSTMENT ACTIONS GENERAL SCHEME General scheme for adjustment of the gas valve(s). Check this scheme for an overview. To complete all necessary adjustments in right order, follow case A or B top-down through the scheme (B involves a few extra steps (grey text blocks): GENERAL SCHEME SETTING STEPS Case A Case B...

  • Page 91: Adjusting In Case Of A New Boiler, Or After Maintenance (Case A)

    1 or figures. 14.3.2. HECKING AND ADJUSTING AT MAXIMUM LOAD The S-CB PX 120 has a single gas valve, see the drawings. • First, turn setting screws [2] clockwise until you feel resistance. This means that the valve is closed, do not try to tighten the screw any further in the closed position.
  • Page 92 Decrease CO percentage Turn screw [2] right (clockwise) Increase CO percentage Turn screw [2] left (counter clockwise) The service operation of the boiler will be active for 40 minutes. After this period the boiler will return to normal operation. Procedure 2: adjust at minimum load In case B (gas conversion or replacement of gas valve): consult chapter 14.3.

  • Page 93: Gas Conversion Propane Or B/P

    14.5. Gas conversion propane or B/P To use another type of gas with the boiler, only a conversion kit for butane/propane is needed, which consists of an air restrictor and an O-ring to air tighten the gap between the fan and the venturi. This changing of gas type involves a different calorific value and composition of the gas.
  • Page 94 Instructions for butane/propane kit application The air restrictor is a plastic cap with a slit in it. To apply it, follow the next steps (see picture below): • Disassemble the complete burner door unit, as described in chapter 17.2. • Loosen the three screws (1) that connect the venturi to the fan.

  • Page 95: Putting The Boiler Out Of Operation

    PUTTING THE BOILER OUT OF OPERATION It is recommended to have the boiler operational all year around to prevent any frost damage during the winter and/or rotating parts getting jammed during other times of the year (built in boiler safety features). 15.1.

  • Page 96: Fault Codes And Blocking Codes

    FAULT CODES AND BLOCKING CODES 16.1. Fault codes IMPORTANT: To avoid electric shocks, disconnect electrical supply before performing troubleshooting. To avoid burns, allow the unit to cool before performing troubleshooting. Be aware that a fault code is an indication that the unit or the system needs attention. When repeatedly having faults these should not be neglected.
  • Page 97 F8  Cause: Ignition spark, but no flame. Corrective action: Check if all gas valves in the supply line are completely open. Check if there is no air in the gas supply (start-up new systems). Check if the gas valve opens. When there is power supply to the gas valve, but the valve does not open, the gas valve must be replaced.
  • Page 98 Display message a m e p u m p 9 9 9 h r s Reason Flame signal lost during operation. Cause: Bad gas supply pressure Corrective action: Be aware that the specified gas pressure must be met during all operation conditions. Check if all gas valves in the supply line are completely open.
  • Page 99 o w R e t u r n Display message p u m p 9 9 9 h r s Reason: Temperature difference between flow and return exceeds limita- tion value, or 'Heatexchang at Risk' has occurred 3 times. Cause: The water flow through the unit is too low. Corrective Action: Check functioning of the pump.
  • Page 100 Display message e m p t o o p u m p 9 9 9 h r s Reason Flue gas temp. exceeded 3 times limitation value within a certain period. Cause: Heat exchanger polluted and not able to transfer enough heat to system water. Corrective action: Check and clean heat exchanger.

  • Page 101: Blocking Codes

    Display message t u r n T e m p p u m p 9 9 9 h r s Reason Maximum return temperature exceeds limit value. Cause: Systems that pre-heats the boiler return temperature too much/high. Corrective action: Reduce pre-heat temperature of external heat source. Cause: The need for heat in the system suddenly drops causing hot return water to the boiler.
  • Page 102 Display message C a s c a d e o c k 9 9 9 h r s Reason Connection failure with one of the boilers of the cascade. Cause: The unit is programmed in such a way that none of the boilers in a cascade will fire, if one has a lock-out.
  • Page 103 Display message e m p 9 9 9 h r s Reason Flue gas temperature has exceeded the limit. Cause: Heat exchanger polluted and not able to transfer enough heat to the system water. Corrective action: Check and clean heat exchanger. Cause: Bad flue gas sensor or sensor connection (partly shorted.) Corrective action:...
  • Page 104 Display message O u t d o o r s e n s o r 9 9 9 h r s Reason No outdoor sensor detected. Cause: The unit is programmed to check if an outdoor sensor is present and does not detect an outdoor sensor.

  • Page 105: Maintenance Reminder Function

    16.3. Maintenance reminder function The display shows alternating the base screen and this message, while backlight is blink- ing. The boiler is operating, but will count the exceeding hours. A parameter must be changed, after service, to remove this message. Display message N e e d s e n a n...

  • Page 106: Maintenance

    MAINTENANCE 17.1. General For a good, safe and long-time operation of the boiler it is advised to carry out maintenance and service on the boiler. Maintenance and inspection of the boiler should be carried out at the following occasions: • When a number of similar error codes and/or lock-outs occur.
  • Page 107 Service history The operational and fault history (total amount and since the last service) of the boiler can be retrieved with the help of a computer, correct software and an interface cable. This information can be used to specify the maintenance and service proceedings in relation to the boiler (parts).
  • Page 108 3.5 mm / 0.14 inch D = 8 - 10 mm D = 0.315 - 0.393 inch Point of view in next picture  Burner door gaskets When these gaskets have changed colours at some parts, the rubber has cured and/or has damages, these gas- kets must be replaced.

  • Page 109: User Instructions

    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 15 “Adjusting and setting the burner”. Pump Check the electrical parts and the motor of the pump for a correct functioning.

  • Page 110: Installation Examples

    INSTALLATION EXAMPLES The following schematics present several ways of mounting the heating installation. All schematics are purely functional. Safety components must be added conform all applicable standards and regulations. System type 1 System 6 Name Wire terminal Part no. Boiler pump 30-31-32 E400157 Optional heating pump...
  • Page 111 System type 3 System 8 Name Wire terminal Part no Boiler pump 30-31-32 E400157 Optional heating pump 23-24-25 Modulating room unit 11-12 S04.016.355 with timer Calorifier DHW primary pump 27-28-29 Calorifier thermostat E400277 or tank sensor Low loss header Flow temperature sensor E04.016.304 Non-return valve (low resistance type)
  • Page 112 System type 5 System 10 Name Wire terminal Part no Boiler pump 30-31-32 E400157 Optional heating pump 23-24-25 Modulating room unit with timer 11-12 S04.016.355 Non-return valve (low resistance type) = boiler master = boiler slave1 Low loss header = boiler slave2 = boiler slave3 Flow temperature sensor E04.016.304...
  • Page 113 System type 11 System 11 Name Wire terminal Part no Boiler pump 30-31-32 E400157 Optional heating pump 23-24-25 Modulating room unit with timer 11-12 S04.016.355 Non-return valve (low resistance type) DHW primary pump 27-28-29 Calorifier tank Calorifier thermostat or sensor E400277 Low loss header Flow temperature sensor...

  • Page 114: Strebel S-Cb Px 120

    Strebel S-CB PX 120 19.1. Spare parts exploded view and part numbers...
  • Page 116 Draw No Part Number Description E400148 Side panel left S-CB PX 120 E400147 Front panel S-CB PX 120 Serial number dependent E04.016.583 Ignition cable 35-180 BIC S04.000.372 Electrode set c/w gasket & screws. S04.000.243 Maintenance set 16 mm insulation (A/CD/C)
  • Page 117 NOTES:...
  • Page 118 Strebel Ltd Unit 10, Invincible Industrial Estate, Invincible Road, Farnborough, Hampshire, GU14 7QU. 01276 685422 01276 685405 info@strebel.co.uk www.strebel.co.uk Further information on our complete product range is available from our website. CAST IRON – CONDENSING – STEEL SHELL – WATER HEATERS – RENEWABLES...

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