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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
Wall hung high efficiency condensing boiler
Installation, Operating & Maintenance Manual
2015-04-21 v3

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Summary of Contents for Strebel S-CB Px 120

  • Page 1 STREBEL S-CB Px 120 Wall hung high efficiency condensing boiler Installation, Operating & Maintenance Manual 2015-04-21 v3...
  • Page 2 S-CB Px 120 Manual...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION…………………………………………………………………………………………………..5     SAFETY GUIDELINES ..........................7     TECHNICAL DATA OF THE STREBEL S-CB Px 120 BOILER ..............9     2.1......................9 UNCTIONAL INTRODUCTION     2.2..................10 ECHNICAL SPECIFICATIONS DATASHEET    ...
  • Page 4 Anti-Legionnaires’ disease function (pasteurisation) ............78     11.4........................79 ASCADE CONTROL     11.4.1. Parameter settings for cascaded boilers ................79     11.4.2. Monitor screens ........................ 81     11.4.3. Output control and boiler sequence .................. 81 S-CB Px 120 Manual...
  • Page 5 NNUAL INSPECTION MAINTENANCE     USER INSTRUCTIONS .......................... 103     INSTALLATION EXAMPLES ......................... 104     S-CB Px 120 SPARE PARTS OVERVIEW AND PART NUMBER LIST ..........110     20.1......................110 PARE PARTS DRAWING     20.2.
  • Page 6 S-CB Px 120 Manual...

  • Page 7: Introduction

    Children should be supervised to ensure that they do not play with the appliance. S-CB Px 120 Manual...
  • Page 8 These instructions are written for the installer of Strebel products and contain all necessary information on the installation and adjustment of S-CB Px 120 boilers. Please read these instructions fully before installation to en- sure that all work is carried out correctly.

  • Page 9: Technical Data Of The Strebel S-Cb Px 120 Boiler

    This immediately improves the efficiency considerably. The S-CB Px 120 boiler is standard set for Natural Gas G20 Gases used must meet the European standard EN 437.

  • Page 10: Technical Specifications Datasheet

    When using propane or butane, a special air restrictor kit is needed. See accessories list on page 13 and picture page 86. Below a table is given in which the min. and max. gas supply pressures are mentioned according to EN437 p nominal [mbar] p min [mbar] p max [mbar] S-CB Px 120 Manual...
  • Page 11 Maximum combined resistance of flue gas and air supply piping at high fire With a pressure switch instead of the standard sensor, pressure may go up to 6,0 bar S-CB Px 120 Manual...

  • Page 12: Dimensions

    (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 flow connection Circulation return connection (Circulation pump side) S-CB Px 120 Manual...

  • Page 13: Accessories And Unpacking

    S04.016.586 Propane / butane air restrictor kit S05.000.149 4.2. Unpacking The 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. • One suspension bracket.

  • Page 14: Installation Of The S-Cb Px 120

    INSTALLATION OF THE 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 15: Mounting The Boiler

    3. Lock boiler with locking plate and two bolts 1. Attach mounting bracket to wall with inclined side facing upwards 2. Suspend boiler with suspension bracket on mounting bracket 4. Level boiler using adjusting bolts Boiler suspension Detail boiler suspension S-CB Px 120 Manual...

  • Page 16: Boiler Connections

    Keep the connections fixed in place, as shown in the picture, by using two wrenches. 6.1.2. AS CONNECTION Always install a manual shutter valve in the gas supply line, directly underneath the boiler. NOTICE: This valve is NOT delivered with the boiler. S-CB Px 120 Manual...

  • Page 17: Condensate Drain Connection

    When mounting the siphon, before commissioning the boiler and/or after maintenance, the siphon must ALWAYS be completely filled with water. This is a safety measure: the water in the siphon keeps the flue gases from leaking out of the heat exchanger via the condensate drain. S-CB Px 120 Manual...

  • Page 18: Flow And Return Connections

    The boiler pump must be controlled by the S-CB Px 20 boiler control. If, for any reason, an exter- • nal pump control is applied without written approval of Strebel Ltd, the complete warranty on the S-CB Px 120 boiler and all supplied parts will become invalid.

  • Page 19: Frost Protection

    TO BOILER(S) SYSTEM VALVE VALVE STRAINER (WATER FILTER) SYSTEM WITH STRAINER AND DIRT SEPARATOR WATER RETURN BLEED WATER VALVE FROM DIRT SE- FLOW TO SYSTEM PARATOR BOILER(S) VALVE VALVE STRAINER DIRT (WATER FILTER) BLEED VALVE S-CB Px 120 Manual...

  • Page 20: Water Quality

    Some form of logging should take place, so that continuously filling of the system with large amounts of oxygen rich fresh water, indicating leakage, is detected in time. S-CB Px 120 Manual...

  • Page 21: Water Pressure

    Flush the system with fresh water The water of the boiler and heating circuit should be free of any particles, debris and pollution. Therefore the complete installation must always be thoroughly flushed with clean water before installing and using the boiler(s). S-CB Px 120 Manual...

  • Page 22: Installation Examples

    6.18.2. XAMPLE OF A NORMAL SINGLE BOILER HEATING CIRCUIT PREFERABLE valve air separator dirt separator strainer (water filter) pressure relief valve HEATING ZONE siphon pump automatic air vent expansion vessel low loss header S-CB Px 120 Manual...

  • Page 23: Example Of A Multiple Boiler Heating Circuit

    6.18.3. XAMPLE OF A MULTIPLE BOILER HEATING CIRCUIT NON RETURN VALVE (low resistance type) NOT SPRING LOADED HEATING ZONE S-CB Px 120 Manual...

  • Page 24: Hydraulic Graph Boiler Resistance (Mwc)

    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; the pump will modulate between these two levels. S-CB Px 120 Manual...

  • Page 25: Pumps: Electrical Power Limits

    Directly connect the pump to an external power supply. Control connections of an EC pump can be established in several ways, set by parameter P5BN. See § 11.1.7 on page 71. S-CB Px 120 Manual...

  • Page 26: Flue Gas Discharge And Air Supply System

    When not installed accordingly it may result in condensation building up in the flue gas tube which may cause component failure. It is preferable to use roof terminals. Because of the high capacity, using wall terminals on the S-CB Px 120 •...

  • Page 27: Pipe Heights On A Flat Roof

    I or E L20040 A few examples of flue gas material suitable for Strebel boilers: CE String for Plastic PP: EN14471 T120 P1 W 2 O(30) I C/E L CE String for Stainless Steel: EN1856-1 T250 P1 W V2-L50040 )(50) Be aware by selecting flue gas systems that the minimum requirements are met.

  • Page 28: C63 Certified

    = 0 open outlet H/D = 1,0 zeta = 1,0 zeta = 0,05 conical outlet CONCENTRIC FLUE GAS OUTLET AIR INLET H/D = 1,0 ROOF zeta = 1,0 H/D = 0,5 WALL zeta = 1,5 S-CB Px 120 Manual...

  • Page 29: Maximum Straight Lengths - Five Typical Examples

    → Total resistance is 151 Pa < 160 Pa. This system therefore fulfils the requirements. - All pipe diameters Ø 100 mm (twin pipe) or Ø 100/150 mm (concentric) - All lengths in m - R = resistance - All resistances in Pa S-CB Px 120 Manual...

  • Page 30: Open Version (B23, B23P, B33)

    In this case: The boiler room must be provided with the necessary air inlet opening(s). These air inlet opening(s) must remain open at all times and may not be reduced or closed. S-CB Px 120 Manual...

  • Page 31: Electrical Installation

    The boiler pump must be controlled by the S-CB Px 120 boiler control. If, for any reason, an external pump control is applied without written approval of Strebel Ltd, the complete warranty on the S-CB Px 120 boiler and all supplied parts will become invalid.
  • Page 32 Connection for modulating boiler circulation pump (P1). The pump is powered permanently and modu- lated by the PWM signal of the burner controller. 33-34-35 MAIN POWER SUPPLY TO BOILER 230V~50Hz The power supply connection of the unit. 33 = Phase wire; 34 = Ground wire; 35 = Neutral wire. S-CB Px 120 Manual...

  • Page 33: Electrical Schematics

    9.4. Electrical schematics S-CB Px 120 Manual...
  • Page 34 S-CB Px 120 Manual...

  • Page 35: Sensor Values And Conversion Tables

    Conversion table: temperature vs. resistance, for the outdoor sensor with value NTC-12k B3740. Temperature Resistance Temperature Resistance (°C) (Ω) (°C) (Ω) 36130 28600 22800 18300 171800 14770 129800 12000 98930 9804 76020 8054 58880 6652 45950 5522 S-CB Px 120 Manual...

  • Page 36: User Interface

    Also used for navigating through the menus and for chang- ing values. Button to activate service function (hold for three seconds). SERVICE Schornsteinfeger function (only for Germany). Light: lights when controller detects good flame signal. Lights when burner is burning. S-CB Px 120 Manual...

  • Page 37: Control Panel Menu Structure

    - When heater is turned ON the BASE DISPLAY. - When heater is turned OFF (This period can be set by a parameter) sequence: The messages will show from TOP to BOTTOM each for three seconds. → S-CB Px 120 Manual...
  • Page 38 Shows burning hours DHW, Heating, used. etc. parameter menu Enter password Enter PW Level 1: Enter PW Level 2: three second message three second message confirming access: confirming access: LEVEL 1 LEVEL 2 S-CB Px 120 Manual...

  • Page 39: Display During Operation

    When the burner is firing, also the actual rpm% is shown. 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. S-CB Px 120 Manual...

  • Page 40: Monitor Screens

    Shows when the system pump is "ON" or "OFF". h h : m m D D / M M / Y Y Y Y D a y hh=hour; mm=minutes; DD=day; MM=month; YYYY=yr; day of the week S-CB Px 120 Manual...
  • Page 41 C l o s e d Status of the siphon pressure switch: "Open" or "Closed". N R V C o n t a c t O p e n Status of the non-return valve contact: "Open" or "Closed". S-CB Px 120 Manual...

  • Page 42: Service Function

    The relation between the maximum rpm set point and the maximum actual rpm is given in this table. This table applies also to the service and “Schornsteinfeger” function of the boiler. S-CB Px 120 Manual...

  • Page 43: Schornsteinfeger Function

    The "Schornsteinfeger function" can be activated for the user by programming a parameter (P5 BK). All regular temperature safety controls remain active and the boil- er/water heater pump and the system pump are running. S-CB Px 120 Manual...

  • Page 44: Programming In Standby Mode

    Press [◄] to cancel the changes made (display goes back to operating screen). Press [►] to confirm the changes made. The time and day will start blinking for a few seconds. After this, the display returns to its operating screen. S-CB Px 120 Manual...

  • Page 45: Set Points

    Parameter P6 BB. Heating parallel shift: H e a t i n g P a r s h i ° C Setting the parallel shift of the heating curve related to the outdoor temperature control (parameter P6 BC). S-CB Px 120 Manual...

  • Page 46: Setting The Timer Programs

    This reduction is used outside the pro- grammed DHW periods (parameter P4 AA = 1/2). 10.10. Setting the timer programs Three different programs can be set with the boiler, these are: CH program • DHW program • Anti-Legionnaires’ disease (pasteurisation) program • S-CB Px 120 Manual...
  • Page 47 Press [►] to confirm the changes. The two days will blink for a moment. Press [MENU] to exit. The boiler will reset and go to the operating screen. Press [◄] for next SCREEN > > > Continue on next page HOT WATER program < < < S-CB Px 120 Manual...
  • Page 48 Press [►] to confirm the changes. The two days will blink for a moment. Press [MENU] to exit. The boiler will reset and go to the operating screen. Press [◄] for next SCREEN > > > Continue on next page LEGIONELLA program < < < S-CB Px 120 Manual...

  • Page 49: Setting The Outdoor Specifications

    “1” on the master boiler only. The heating curve that is set on the master boiler is used for controlling the flow temperature of the whole cascade. 0 = No outdoor temperature sensor connected 1 = Outdoor temperature sensor connected S-CB Px 120 Manual...
  • Page 50 The actual parallel shift that is set by the user within the bandwidth allowed according to “P5AQ Max Heat curve Parallel Shift”. is continued → S-CB Px 120 Manual...
  • Page 51 This parameter can be used to change the value of an ohmic contact of the outside sensor; 0 = 12K and 1 = 10K. Default the parameter = 0, so the sensor is assumed to be 12 kΩ. S-CB Px 120 Manual...
  • Page 52 H C n g h t s h f P6 BB - 1 0 ° C H C p a r a s h f P6 BC ° C O u t S 1 2 k 1 0 k P5 AR S-CB Px 120 Manual...

  • Page 53: Checking The Operating History

    1 0 0 0 0 0 S s 1 0 0 0 0 6 Top line: Shows Total Ignition Attempts (Tia) & Failed Ignition Attempts (Fia) Bottom line: Shows Soft Starts last (Ssl) & Soft Starts Total (Sst) S-CB Px 120 Manual...

  • Page 54: Checking The Fault History

    (electronics) since the start of operation. R: Shows the elapsed time in hrs between the moment the fault occurred and the moment it was reset. S-CB Px 120 Manual...

  • Page 55: Setting The Maintenance Specifications

    C a n c e l ; > C o n f i r m Press [◄] to cancel the changes or [►] to confirm the changes. Hereafter the boiler returns to the operating screen. Go to next page S-CB Px 120 Manual...
  • Page 56 C a n c e l ; > C o n f i r m Press [◄] to cancel the changes or [►] to confirm the changes. Hereafter the boiler returns to the operating screen. Go to next page S-CB Px 120 Manual...
  • Page 57 Because it concerns a free programmable function the use of it cannot be used as an argument in warranty cases. Our units must be maintained every twelve months whatever the settings/working of this function. It is and remains the responsibly of the end user to have the unit maintained every twelve months. S-CB Px 120 Manual...

  • Page 58: Setting The User Lock

    After this, the display returns to the operating screen. NOTICE: Using the [MENU] button during the User lock display, will reset the boiler and the boiler will return to the operating screen. Changes will be neglected in this case. S-CB Px 120 Manual...

  • Page 59: Setting The Parameters With The Display Menu

    IMPORTANT: Do not change the parameters P2LC, P2LD, P2ML, P2MM and P5BI; they are present in the con- troller for different purposes than CH control. Changing these parameters may affect boiler operation negatively. Parameter screens + concise explanation see next pages → S-CB Px 120 Manual...
  • Page 60 CH supply temperature. Menu A: Heating c O f ° C Select the cascaded boilers supply temperature control. This parameter is the offset of the selected CH supply tem- perature of EACH boiler of the total cascade. S-CB Px 120 Manual...
  • Page 61 M i n Hot water function of the boiler. This parameter is the se- lectable time period after which the boiler switches from LOW to HIGH set point with an indirect hot water demand. S-CB Px 120 Manual...
  • Page 62 Menu B: Hot water D H d s c D i ° C Function for the direct hot water boiler. This parameter is the hysteresis of the selected HW temper- ature of the boiler. S-CB Px 120 Manual...
  • Page 63 / m a s Function for the cascading of the boiler(s). This parameter determines if only the Master boiler or all boil-ers of the cascade are used for indirect hot water. 0 = All 1 = Master S-CB Px 120 Manual...
  • Page 64 1 0 0 Function for setting the location height (above sea level) of the boiler. NOTICE: dimensions in English feet. One unit = 100 ft. Use this function only in consultation with the supplier / manu- facturer. S-CB Px 120 Manual...
  • Page 65 1 = relay 1, connector 19 and 20 (lock-out) 2 = relay 2, connector 21 and 22 (burner burning) 3 = relay 3, connector 23 and 24 (heat demand) 4 = relay CN10, connector 9 and 18 S-CB Px 120 Manual...

  • Page 66: Fault Codes Display

    Reason: Flue gas temperature exceeds the limit which has been set in the parameters. Display message p u m p Reason: Boiler is not starting after the programmed starting attempts. S-CB Px 120 Manual...
  • Page 67 Reason: Maximum thermostat (clixon) measured a too high flow temperature. p h o n Display message p u m p Reason: The pressure switch detects a high pressure in the flue/siphon system. S-CB Px 120 Manual...

  • Page 68: Blocking Codes

    P2CQ - P2CV. Display message Reason: Temperature difference T2-T1 has exceeded the blocking value, as set in the parame- ters P2CQ - P2CV, more than three times. Display message Reason: Gas supply pressure is (too) low. S-CB Px 120 Manual...

  • Page 69: Messages

    Display message Reason: Maintenance option of the date has been reached. Display message Reason: Maintenance option of total amount of burning hours has been reached. Display message Reason: One of the abovementioned maintenance options has been reached. S-CB Px 120 Manual...

  • Page 70: 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 71: Soft Start Option

    Start-stop through relay 3, connectors 23 and 24 (heat demand) The boiler pump must be controlled by the S-CB Px 120 boiler control. If, for any reason, an external pump control is applied without written approval of Strebel Ltd, the complete warranty on the S-CB Px 120 boiler and all supplied parts will become invalid.

  • Page 72: Heating

    P5 AL Hysteresis = 10°C Temp. set point = 70°C Burner starts at 65°C Set point + Offset - Hysteresis = 70+5-10= 65°C Burner stops at 75°C Set point + Offset = 70 + 5 = 75°C S-CB Px 120 Manual...

  • Page 73: Room Thermostat On/Off

    See also the following graph for the relation between the temperature and the control signal. P2GB off P2GA on P2GC max. P6BA max. temperature set point e.g. 90°C P5AI min. temperature set point e.g. 20°C (default) 0-10 Vdc control signal S-CB Px 120 Manual...

  • Page 74: Vdc Remote Burner Input Control

    When this parameter is activated and: The thermostat terminals are bridged (timer contact closed), the normal day-time temperature is used as set point. The thermostat terminals are not bridged (timer contact open), the night reduced temperature is used as set point. S-CB Px 120 Manual...

  • Page 75: Indirect Hot Water / Calorifier

    Hysteresis DHW tank temperature (display BF) The amount of degrees that the hot water temperature in the indirect water tank/calorifier needs to drop relative to the hot water set point, before the heat demand is transported to the boiler. S-CB Px 120 Manual...

  • Page 76: Low/High Flow Temperature To Tank Coil

    The high level flow temperature to the tank coil(s) in case of a calorifier/indirect hot water demand. P5 CL Low flow temperature time DHW (display B4) The programmed period for changing the set point of the water flow temperature from low to high. The standard factory setting for this function is “OFF”. S-CB Px 120 Manual...

  • Page 77: Heating And Hot Water Switching Time

    SETPOINT The parameter acts in this temperature range ALLOWED TO MODULATE BOILER ON P2KH Gradient heat demand detect DHW tank temperature (display BG) See the given explanation. The standard factory setting for this function is “OFF”. S-CB Px 120 Manual...

  • Page 78: Anti-Legionnaires' Disease Function (Pasteurisation)

    2, at the control panel of the unit without the use of a computer. NOTICE: The use and activation of this function won’t guarantee a Legionnaires’ disease free installa- tion. The responsibility for a Legionnaires' disease free installation remains at the end-user/owner. S-CB Px 120 Manual...

  • Page 79: 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 S-CB Px 120 range boilers. He will be able to check whether the installa- tion functions correctly after the parameter change has been done.
  • Page 80 Master = 0, Slave1 = 1, etc. When the correct parameter is set, this must be confirmed at the confirmation screen. After activation, the value will blink for a few seconds while the parameter is programmed into the boiler. S-CB Px 120 Manual...

  • Page 81: Monitor Screens

    Table: boiler sequence example of an eight boiler cascade. In this table a total of eight boilers (one master, seven slaves) is mentioned as an example, in practice the maxi- mum number in a cascade, without extra (external) control, is twelve boilers. S-CB Px 120 Manual...

  • Page 82: Commissioning The Boiler

    Boiler is active, but there is no heat demand. When no water is present in the boiler or water pressure is too low/high, the boiler will go into lock-out and show a corresponding message in the display. S-CB Px 120 Manual...
  • Page 83 During and after the commissioning of the boiler, the operation of the boiler pump must be checked, before lea- ving the installation room. NOTICE: Always check the running of the pump before firing the boiler. S-CB Px 120 Manual...

  • Page 84: Starting The Boiler

    When mounting the bottom part of the siphon, before commissioning the boiler and/or after maintenance, the siphon must ALWAYS be completely filled with water. This is a safety measure: the water in the siphon keeps the flue gases from leaking into the plant room via the condensate drain. S-CB Px 120 Manual...

  • Page 85: Adjusting And Setting The Burner

    ± 0,3% (O values within ± 0,5%), no setting is needed. In all cases where setting is needed: set the gas valve until measured CO values match table values within ± 0,1% (O values within ± 0,2%). S-CB Px 120 Manual...

  • Page 86: Setting At The Minimum Load

    When needed, adjust the gas valve setting by the adjust- ing screw [1]. See the drawing above. Decrease CO percentage Turn screw [1] left (counter clockwise) Increase CO percentage Turn screw [1] right (clockwise) See next page for additional measurements → S-CB Px 120 Manual...
  • Page 87 After these adjustments, return to normal operation by pressing the [SERVICE] button. IMPORTANT : Make sure that the screw(s) on the measuring points are mounted again, after the work on the gas valve has been finished. S-CB Px 120 Manual...

  • Page 88: Gas Conversion Butane/Propane (B/P)

    Reassemble both the burner door unit on the heat exchanger and the venturi with air restrictor on the fan. • 1. venturi screws 2. plastic ring 3. O-ring 4. air restrictor 5. clamp Picture: application of the air restrictor kit for butane/propane S-CB Px 120 Manual...

  • Page 89: Putting The Boiler Out Of Operation

    In case of possible frost damage: drain both the boiler and the heating system. • NOTICE: Before starting to drain the boiler, first start draining the heating system and subsequently open also the two drains of the boiler. S-CB Px 120 Manual...

  • Page 90: Fault Codes And Blocking Codes

    Check/open all valves that might restrict the water flow through the unit. Check for an external system pump that influences flow through the unit. Check if the system resistance exceeds the spare capacity of the unit pump. S-CB Px 120 Manual...
  • Page 91 Flue sensor is not detected by the boiler PCB. Cause: Bad wiring/connection in the flue gas sensor circuit. Corrective action: Check for loose wiring/connections in the flue gas sensor circuit. Cause: Bad temperature sensor causing a fault signal. Corrective action: Replace flue gas sensor. S-CB Px 120 Manual...
  • Page 92 Check the state of the sparkplug cap and replace it if necessary. Check power supply. Voltage must be 230 Vac nom. Check for proper electrical grounding of unit. Bad ignition transformer. Replace the burner control of the unit. F8 → S-CB Px 120 Manual...
  • Page 93 Check the distance between the electrode pin, earth pin and burner. Check the state of the ignition wire (is also ionisation wire), and replace if necessary Check the state of the igniter earth wire/connection and replace it if necessary. Check for proper electrical grounding of unit. S-CB Px 120 Manual...
  • Page 94 Reason Programming of the parameters completed successfully. Cause: Programming of the parameters completed successfully. Corrective action: This message occurs to confirm the end of programming. Pressing RESET will return the unit in normal operating status. S-CB Px 120 Manual...
  • Page 95 Check/open all valves that might restrict the water flow through the unit. Check for an external system pump that influences the flow through the unit. Check if the system resistance exceeds the spare capacity of the unit pump. S-CB Px 120 Manual...

  • Page 96: Blocking Codes

    A partly shorted sensor will drop its resistance and therefore ‘measure’ a raise in temperature when actually there is none. Check for moist in the sensor connections or replace the sensor. ´Flue temp high´ message continues p.t.o. → S-CB Px 120 Manual...
  • Page 97 Check if there is no leakage in the system that causes the pressure to drop. Fix any leak- age and fill the system. Check if there is an external system pump that sucks water through the boiler, causing an underpressure. (bad installation design). S-CB Px 120 Manual...
  • Page 98 Check for an external system pump that influences flow through the unit. Check if the system resistance exceeds the spare capacity of the unit pump. Make sure the heat exchanger is clean. Heat exchanger fouling (partly blockage) will increase the resistance causing the water flow to drop. S-CB Px 120 Manual...

  • Page 99: Maintenance Reminder Function

    This message function is standard not activated, but can be acti- vated/set by a trained engineer. This function does not overrule the need for annual maintenance. The end user is always respon- sible for arranging annual maintenance. S-CB Px 120 Manual...

  • Page 100: Maintenance

    • Close the gas valve to block gas supply to the boiler • Customer comments Comments and remarks from the customer should be analysed and used to find possible causes for any occurring problems and complaints. S-CB Px 120 Manual...
  • Page 101 Check the electrode, after bending, for any tear/crack and signs of rust. When they are burst/cracked or rusty, replace the electrode. Also replace the electrode when there is a crack in the ceramic insulation of the elec- trode. When the electrode is going to be replaced also the gasket should be renewed. S-CB Px 120 Manual...
  • Page 102 After this the dirt and dust can be removed with a vacuum cleaner and by flushing the burner room with water. Don’t forget afterwards to clean the siphon once again. Cleaning the burner room with acid or alkali products is prohibited. S-CB Px 120 Manual...

  • Page 103: User Instructions

    12 months. Regular service and maintenance is essential for a safe and proper operation of the boiler. Hand over the documents that are supplied with the boiler. S-CB Px 120 Manual...

  • Page 104: Installation Examples

    System type 3 System 3 Name Wire terminal Order nr. Boiler pump Optional heating pump 25-26-27 Modulating room unit 13-14 E04.016.355 with timer Outside temperature E04.016.585 sensor No parameter change required = boiler = heating zone S-CB Px 120 Manual...

  • Page 105: S-Cb P X 120 Spare Parts List With Part Numbers

    Wire terminal Order nr. Boiler pump Optional heating pump 25-26-27 Modulating room unit with 13-14 E04.016.355 timer Flow temperature sensor E04.016.304 Low loss header Outside temperature sen- E04.016.585 No parameter change required = boiler = heating zone S-CB Px 120 Manual...
  • Page 106 Calorifier DHW primary pump 29-30-31 Calorifier thermostat E04.016.303 or tank sensor Low loss header Flow temperature sensor E04.016.304 Non return valve (low resistance type) Outside temperature E04.016.585 sensor Parameter change required = boiler = heating zone S-CB Px 120 Manual...
  • Page 107 DHW primary pump 29-30-31 Calorifier tank Calorifier thermostat E04.016.303 or tank sensor Low loss header Flow temperature E04.016.304 sensor Non return valve (low resistance type) Outside temperature E04.016.585 sensor Parameter change required. = boiler = heating zone S-CB Px 120 Manual...
  • Page 108 E04.016.355 Non return valve (low resistance type) Low loss header Flow temperature sensor E04.016.304 Outside temperature sensor E04.016.585 Parameter change required = boiler master = boiler slave1 = boiler slave2 = boiler slave3 = heating zone S-CB Px 120 Manual...
  • Page 109 Calorifier tank Calorifier thermostat or sensor E04.016.303 Low loss header Flow temperature sensor E04.016.304 Outside temperature sensor E04.016.585 Parameter change required. = boiler master = boiler slave1 = boiler slave2 = boiler slave3 = heating zone S-CB Px 120 Manual...

  • Page 110: S-Cb Px 120 Spare Parts Overview And Part Number List

    S-CB Px 120 SPARE PARTS 20.1. Spare parts exploded view Numbers in the drawing correspond to the parts list on page 112. S-CB Px 120 Manual...
  • Page 111 S-CB Px 120 Manual...
  • Page 112 S07.002.018 O-ring 33x2 NBR S04.000.213 Insulation burnerroom 16 mm S04.016.582 Fuse 5 at (10 pcs) Boiler control S-CB Px 120. State type and serial nr. S04.000.224 Display BIC incl. cable E05.001.062 Rubber plug Ø15 S1711EN Protective cover S-CB Px 120 ENG S04.000.280...
  • Page 113 S1720 Flow pipe assy S-CB Px 120 E09.002.022 Spring coupling E07.002.033 O-ring Ø33,50 x 4,00 S1721 Return pipe assy S-CB Px 120 E04.018.110 Lip seal Ø 100 mm. air inlet E04.016.656 NTC flue gas sensor 1/8" E04.016.274 High limit thermostat 100°C S07.004.024...

  • Page 114: Index

    14, 42, 70, 88, 100 plastic piping in the heating sys- water quality, 20 fault checking, 54, 66 tem, 20 water side connections, 15 fault codes display, 66 positioning the boiler, 15 water treatment, 21 S-CB Px 120 Manual...
  • Page 115 49, 73 S-CB Px 120 Manual...
  • Page 118 Strebel Ltd 1f Albany Park Industrial Estate, Frimley Road, Camberley, Surrey, GU16 7PB. 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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