andrews MAXXflo EVO CWH 150/302 Installation And Maintenance Manual
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andrews MAXXflo EVO CWH 150/302 Installation And Maintenance Manual

High effi ciency condensing stainless steel storage water heater
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INSTALLATION AND MAINTENANCE MANUAL
MAXXfl o EVO
High effi ciency condensing stainless steel storage water heater
CWH 150/302
Please read and understand these instructions before commencing installation and leave this manual with the customer for future reference.
Andrews. Built to perform.
M10419

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  • Page 1 INSTALLATION AND MAINTENANCE MANUAL MAXXfl o EVO High effi ciency condensing stainless steel storage water heater CWH 150/302 Please read and understand these instructions before commencing installation and leave this manual with the customer for future reference. Andrews. Built to perform. M10419...
  • Page 2 Blank Page General MAXXfl o EVO 150/302...

  • Page 3: Table Of Contents

    Table of Contents Subject Page General & Safety Information Description of heater ................For whom is this manual intended? ............Symbols used in this guide ..............Safety General safety ..................Regulations and standards ..............UKCA & CE Marking ................Technical Data Technical data ..................

  • Page 4: General & Safety Information

    1.0 GENERAL & SAFETY INFORMATION 1.1 DESCRIPTION OF HEATER This Andrews Water Heaters MAXXfl o EVO is a gas fi red, low NOx, twin heat engine, cascading, direct fi red water heater, with an integrated stainless steel tank. Fully automatic electronic controls are integrated into the heater, with a wide range of control and sensor options available.

  • Page 5: Symbols Used In This Guide

    1.3 SYMBOLS USED IN THIS GUIDE DANGER! Indicates serious danger to personal safety and life DANGER of electric shock! Indicates serious danger from electricity to personal safety and life WARNING! Very hot water can cause severe burns and in extreme cases death CAUTION! Indicates a potentially dangerous situation for the heater and the environment...

  • Page 6: Safety

    This heater is designed to be used in a domestic hot water supply and storage system. Any other use of this heater will be considered improper. Andrews Water Heat- ers declines any responsibility for any damage or injuries caused by an improper use. In order to use the heater according to its designed scope, it is essential to carefully follow the instructions given in this guide.

  • Page 7: Regulations And Standards

    CAUTION If the water system is not in use for periods exceeding 14 days, there is an increased risk of corrosion on all copper parts and an increase in bacterial growth. Follow the recognised measures for Anti-legionella in section 5.4.2. to manage this risk 2.2 REGULATIONS AND STANDARDS This heater must be installed in accordance with relevant Standard Specifi...

  • Page 8: Ukca & Ce Marking

    2.3 UKCA & CE MARKING There is one data plate located on the heater. This is mounted on the outside of the heater (left hand side) CATEGORY: I2H FLUE TYPES: B23,C13,C33,C53,C63 0558-22 0063-22 NG ONLY ADJUSTED FOR G20 @ 20mbar MAXXflo EVO 7800597 MODEL:...

  • Page 9: Technical Data

    3.0 TECHNICAL DATA 3.1 TECHNICAL DATA MAXXflo EVO Product name 150/302 Daily electricity consumption 0.221 elec Declared load profile Sound power level, indoors Daily fuel consumption 24.619 fuel Emissions of nitrogen oxides mg/kWh Weekly fuel consumption with smart controls fuel, week, smart Weekly electricity consumption with smart controls elec, week, smart Weekly fuel consumption without smart controls...

  • Page 10: Product Fiche

    3.2 PRODUCT FICHE MAXXflo EVO Product name 150/302 Declared load profile Water heating energy efficiency class ---- Water heating energy efficiency ηwh % AEC kWh Annual energy consumption AFC GJ Other load profiles for which the water heater is suitable to use and corresponding water heating efficiency and annual electricity consumption Thermostat temperature setting...

  • Page 11: Performance Data

    3.3 PERFORMANCE DATA PERFORMANCE Unit 150/302 Q Maximum Heat Input net (gross) 135.0 (149.9) Q Minimum Heat Input net (gross) 29.0 (32.2) Output Max (Min) 147.2 (31.5) V Maximum Gas Consumption G20 / G31 13.7 / 5.6 Flue gas temperature max (70 C Anti-legionella) at max output G20 / G31 9.0 / 9.8...

  • Page 12: General Dimensions And Connections

    3.4 GENERAL DIMENSIONS & CONNECTIONS TANK INSPECTION CONCENTRIC FLUE/AIR HATCH 130mm/200mm GAS INLET 1" BSP CHECK VALVE 1.5" BSP (m) REMOVABLE AIR DUCT SPIGOT PLATE MULTIPLE CABLE ENTRY POINT SECONDARY RETURN 1" BSP (m) 2x TP VALVES - 28mm MCWS 1.5"...

  • Page 13: System Schematic Examples

    3.5 SYSTEM SCHEMATIC EXAMPLES EXAMPLE 1: SINGLE MAXXfl o EVO (SCHEMATIC) MAXXfl o EVO Maximum circulation rate Q4 pump Model MAXXfl o EVO Flow (m EXAMPLE 2: PARALLEL MAXXfl o EVO (SCHEMATIC) MAXXfl o EVO MAXXfl o EVO Technical Data MAXXfl...
  • Page 14 3.5 SYSTEM SCHEMATIC EXAMPLES (CONTINUED) EXAMPLES 1 & 2: SINGLE AND PARALLEL MAXXfl o EVO (SETUP) Q4 DHW circulation DHW return pump sensor kit 1 amp max (optional) (supplied by others) p/no: 7720071 Main related parameter settings: Menu Parameter Settings 1647 If the function is turned OFF, circulation pump Q4 will be switched OFF while the “Legionella”...
  • Page 15 3.5 SYSTEM SCHEMATIC EXAMPLES (CONTINUED) EXAMPLE 3: MAXXfl o EVO & BUFFER SS300-10 (SCHEMATIC) BUFFER SS300-10 MAXXfl o EVO Technical Data MAXXfl o EVO 150/302...
  • Page 16 3.5 SYSTEM SCHEMATIC EXAMPLES (CONTINUED) EXAMPLE 3: MAXXFLO EVO & STORAGE TANK (SCHEMATIC) K21 Transfer pump 1 amp Max (Supplied by others) Q4 DHW DHW return Circulation AGU2.5 Expansion module sensor kit pump (supplied with Buff er SS300-10) (optional) 1 amp Max p/no: 7720071 (supplied by others)
  • Page 17 3.5 SYSTEM SCHEMATIC EXAMPLES (CONTINUED) EXAMPLE 4: BMS CONNECTIONS Modbus Enable B- REF Fault Flame (top burner) Flame (bottom burner) Technical Data MAXXfl o EVO 150/302...

  • Page 18: Wiring Diagrams

    3.6 WIRING DIAGRAM (MAXXfl o EVO 150 kW MODEL) PCB1 Technical Data MAXXfl o EVO 150/302...
  • Page 19 3.6 WIRING DIAGRAM (MAXXfl o EVO 150 kW MODEL) PCB2 Technical Data MAXXfl o EVO 150/302...

  • Page 20: Installation

    4.0 INSTALLATION 4.1 LOCATING THE HEATER The location selected for installation of the heater must allow the provision of a satisfactory fl ue, an ad- equate air supply (for type B ), a drain and be well illuminated. A purpose built plant room or compartment is strongly recommended.
  • Page 21 Remove the four screws (D) either side of the GUI display unit at high level. Loosen the two screws (E) at low level inside the case to remove the case retaining bracket (F). Pull the inner cover forwards and remove completely. Please note: CWH 150kW models have two removable transit brackets (G) that will need to be removed and recycled prior to removing the inner cover for the fi...

  • Page 22: Cold Water Supply

    The MAXXfl o EVO range of storage water heaters are designed to operate from a mains fed unvented water supply. An unvented system kit is available from Andrews Water Heaters. However, the heater may be connect- ed to an open vent supply provided the minimum supply pressure of 0.8 bar are maintained at all times.

  • Page 23: Unvented Design

    4.4 UNVENTED DESIGN DANGER Unvented systems should only be fi tted by an approved installer When using the heater on an unvented hot water storage system, the Unvented System Kit, part number 7726954, available from the manufacturer must be fi tted. When used in an unvented system, the heater will supply hot water at a maximum of 6 bar or at the pressure available at the mains feed if this is lower.

  • Page 24: Secondary Return Design (Dhw Circulation Pump)

    4.5 SECONDARY RETURN DESIGN (DHW CIRCULATION PUMP) A Secondary Return circuit may be fi tted to the 1” nipple at the top of the heater. In all cases, for serviceability, the recirculation pipe must be fi tted with a stop valve immediately before the connection point. MAXXfl...

  • Page 25: Condensate Disposal

    4.6 CONDENSATE DISPOSAL Condensation is formed in the normal operation of the heater and this must be continuously discharged into a drain. Given the acidity level of condense discharge (pH 3.5 - 4.5) only plastic material can be used for the discharge pipe work.

  • Page 26: Flue Systems And Ventilation

    4.7.2 SUITABLE FLUE MATERIAL When using a fl ue system that has not been supplied by Andrews Water Heaters, make sure that they are certifi ed for the type and use. Check the text string printed on the fl ue system to ensure the correct materials are selected.
  • Page 27 4.7.3 GENERAL VENTILATION REQUIREMENTS (TYPE B CLASSIFICATION) DANGER Flue type B - Is an open fl ue appliance where air is drawn from the room or compartment in which the heater is installed and therefore the room or compartment must be ventilated to out- side air.
  • Page 28 4.7.5 OPEN FLUE APPLIANCE IN A ENCLOSURE VENTILATED DIRECT TO OUTSIDE AIR Installations within a compartment ventilated directly to outside air must be ventilated at high and low level. The minimum free area of permanently open vents must be as follows:- Minimum free vent area Heater Model Low level...
  • Page 29 4.7.7 FLUE TERMINAL POSITIONS - B TYPE (OPEN FLUE) Terminals should be so positioned as to avoid products of combustion entering openings into buildings or other fl ues or vents Code Minimum distance (mm) MAXXfl o EVO 150 Directly below an opening, air brick, opening window etc 2500 Above an opening, air brick, opening window etc 2,170...
  • Page 30 4.7.8 ROOM SEALED FLUE (C & C ) SYSTEM There are four approved room sealed arrangements where both the air inlet and fl ue discharge terminate out- side the building. Flue and air ducts are supplied to a concentric design using 130/200mm fl ue. See section 4.7.10 for compo- nent choices.
  • Page 31 4.7.10 MAXXfl o EVO 150 KW FLUE PARTS Part number: Flue Kits - Description 7620229 VERT FLUE KIT CWH EVO 90 120 150 7620230 HORIZ FLUE TERM CWH EVO 90 120 150 Part number: Optional Flue Parts - Description 7620232 90˚...
  • Page 32 For maximum fl ue lengths see Minimum clearance section 4.8 between vertical Over 5.0m use fl ue condense trap terminals (see item L section 4.7.13) FLAT ROOF FLASHING E217 For maximum fl ue lengths see For maximum section 4.8 fl ue lengths see section 4.8 ANGLED ROOF...
  • Page 33 4.7.12 MAXXfl o EVO 150 KW FLUE SYSTEM DIMENSIONS ALL Ø130/200mm CONCENTRIC FLUE FLUE CONDENSE TRAP VERTICAL FLUE TERMINAL CONDENSE TRAP PART No 7620233 C/W CLAMP PART No E211 PART No 7620229 Ø200 Ø32 Ø40 Ø130 Ø198/199 1780 45 ELBOW C/W CLAMP 90 ELBOW C/W CLAMP PART No 7726992 PART No 7620232...
  • Page 34 4.7.13 FLUE TERMINAL POSITIONS - C TYPE (CONCENTRIC / TWIN) Terminals should be so positioned as to avoid products of combustion entering openings into buildings or other fl ues or vents Code Description Min distance (mm) Directly below an opening, air brick, opening window etc 2,500 Above an opening, air brick, opening window etc 1,100...
  • Page 35 4.8 MAXIMUM FLUE EQUIVALENT LENGTHS Permitted Flue Equivalent Length (FEL) for type B fl ue 40 metres Permitted Flue Equivalent Length (FEL) for type C fl ue 20 metres Permitted Flue Equivalent Length (FEL) for type C fl ue 40 metres The fl...

  • Page 36: Gas Connections

    4.9 GAS CONNECTIONS 4.9.1 GAS SUPPLY The installation of the gas supply must conform, to the Standards and Codes of Practice listed in Section 2.3 of this manual. This water heater is intended to be installed only on a gas supply with a governed meter. The gas meter, regulator and supply pipework must be sized so as to provide an adequate supply to the heater in addition to any other appliances connected to the supply (see 3.3 for gas consumption rates).

  • Page 37: Electrical & Communication Connections

    4.10 ELECTRICAL & COMMUNICATION CONNECTIONS DANGER This heater must be earthed DANGER Isolate the mains electrical supply to the heater before starting any work and observe all relevant safety precautions External wiring to the heater must be installed in accordance with current Regulations for the wiring of buildings and to any Local Regulations that may apply.
  • Page 38 (if fi tted) and can be used by the optional OZW672 Web Server, to provide access to the heater via the Internet or mobile phone app. Please contact Andrews Water Heaters for further advice.

  • Page 39: Commissioning

    5.0 COMMISSIONING GENERAL After installation of pipe work and fi ttings the water systems can then be fi lled and evacuated of all air before commencing commissioning. This is best done with the door and inner cover removed (see 4.2 for details) 5.1 FILLING AND REMOVAL OF AIR 5.1.1 DHW TANK AND SYSTEM In order to ensure safe removal of air from the hot water system, please perform the following:...
  • Page 40 5.1.2 FILLING THE CONDENSATE TRAPS Before operating the burners it is fi rst necessary to ensure that both condensation traps are fi lled with water. This is best done before the fi nal connection is made to the condensate drain. The following actions are sug- gested: 1.
  • Page 41 5.2 COMMISSIONING THE HEAT ENGINES 5.2.1 IMPORTANT NOTES CAUTION The gas mixture and burner off -set gas rate (minimum load rate) is preset by the manufacturer. Please DO NOT attempt to change the settings of the off -set governor behind the sealed cover. Off...
  • Page 42 • Use the control thumb wheel to select “Setup” page and press the thumb wheel to select “Special operations” (see below) Regional settings Special operations Expert • Use the thumb wheel to select the “Chimney sweep” function and use the thumb wheel to activate this function.
  • Page 43 If you are experiencing CO readings that exceed 200 ppm after 20 minutes of burner operation, please fi rst check that your gas analyser is functioning correctly and then contact Andrews Water Heaters on the customer support number given on the rear cover of this manual, for advice.
  • Page 44 If the Commissioning controller is not used the following commissioning procedure must be followed: • Set the time and date Using the GUI screen Refer to section 5.1 in the “CONTROLS OPERATING INSTRUCTIONS MANUAL” • Set the DHW heating times for daytime use using the GUI screen Refer to section 3.3 in the “CONTROLS OPERATING INSTRUCTIONS MANUAL”...
  • Page 45 If you are experiencing CO readings that exceed 200ppm after 20 minutes of burner operation, please fi rst check that your gas analyser is functioning correctly and then contact Andrews Water Heaters on the customer support number given on the rear cover of this manual, for advice.
  • Page 46 5.2.4 HEAT ENGINE COMMISSIONING COMPLETION • Refi t fan PWM connector onto the top heat exchanger, then press the RESET toggle switch for 1 second to clear the control lockout. • Once the lockout has been cleared from the display (bell symbol is not being displayed) close the door of the heater and secure it with the two door clips.
  • Page 47 5.3 CONVERSION FROM SECOND FAMILY (NATURAL GAS - G20) TO THIRD FAMILY OF GASES (PROPANE - G31) This water heater is supplied from the factory already set up for G20 Natural Gas, but each heater can be converted on site to operate on Liquefi ed Propane Gas (G31). CAUTION This conversion MUST be carried out by a competent qualifi...
  • Page 48 • Secure the venturi onto the fan using 2 screws • Secure the venturi onto the gas valve with the remaining 3 screws. Ensure the rubber seal and orifi ce remains in place inside the gas valve outlet. • Replace the air intake hose onto the venturi. Compress the spring clip when fi tting in place Model MAXXfl...

  • Page 49: Frost Protection And Legionella

    5.4 FROST PROTECTION & LEGIONELLA 5.4.1 FROST PROTECTION The Heater is fi tted with automatic Frost Protection. Provided there is mains power, gas connected and the heater is not in a lockout condition, if the temperature registered by the DHW tank temperature sensor falls below 5°C the heat engine will ignite to bring DHW tank temperature up to 6°C before turning off...
  • Page 50 Menu for Anti-legionella function Line no Description Factory default Notes 1640 Legionella Function Off Choose to have the legionella function activated on a fi xed weekday (parameter 1642), every (parameter 1641) number of days or switch the function off . 1641 Legionella function periodically 7 days...

  • Page 51: Final Checks And User Handover

    5.5 FINAL CHECKS & USER HANDOVER 5.5.1 SETTING THE TIME CLOCK AND DHW TIME PROGRAM NB. The DHW time clock is factory programmed to optimise this heaters effi ciency at the declared load profi le under Eco-design Regulations. It is essential that the time / date is set correctly and the DHW operation times have been pro- grammed according to the requirements of the end user.
  • Page 52 5.5.3 CLEANING THE HEATER The casing is fi nished with a polyester coating and will mark if abrasive cleaners are used. It should be cleaned using standard non abrasive cleaning products. A soft cloth used with soap and warm water should be suffi cient to clean the casing.

  • Page 53: Fault Finding

    5.6 FAULT FINDING 5.6.1 OPERATION SEQUENCE To operate this heater you must have suffi cient gas volume and be of the correct gas type. Electricity supply, 220-240v 50Hz and a valid demand from the DHW system. ALL MODELS 1. The circulation pump is turned on. 2.

  • Page 54: Maintenance

    6.0 MAINTENANCE DANGER In all cases, before work commences turn off the Mains Electricity and Gas Supply to the heater 6.1 ROUTINE INSPECTION INTERVALS AND REQUIREMENTS To ensure continued effi cient operation of the heater it is recommended that it is checked and serv- iced at regular intervals.
  • Page 55 6.1.1.1 INSPECT AND CLEAN BURNER ASSEMBLY To view the burner and the inside of the heat exchanger it is recommended that you remove the front of the heat exchanger complete with the fan, venturi and gas valve. The following steps need to be completed before the combustion chamber and burner can be inspected:- •...
  • Page 56 6.1.1.1 INSPECT AND CLEAN BURNER ASSEMBLY (CONT) Removed burner assembly Once assembly is free from the heat exchanger, carry out the following inspection: • Inspect the black silicone and rope gaskets on the inside of the heat exchanger door. Replace seals if there are any signs of damage and in any case replacement of the silicone gasket every two years is recommended.
  • Page 57 • White vinegar can be used to remove stubborn deposits, by spraying the vinegar onto the coils and then waiting fi ve minutes before scrubbing with a nylon brush and fi nally rinsing away all deposits with clean water, until the condense pipe runs clear. •...
  • Page 58 6.1.1.2 SPARK ELECTRODE AND IONISATION ELECTRODE In order to maintain optimum reliability, it is recommended that both sets of electrodes are replaced every two years regardless of their condition. Both of these electrodes are best inspected when they are still in place and the entire heat exchanger door has been removed (see 6.1.1.1), but can also be inspected by carrying out the following : •...
  • Page 59 6.1.1.4. CONDENSATE PIPEWORK AND CONDENSATE TRAP Inspect all joints in the internal condensate pipework (A) for leaks. The internal pipes (A) should be clear, fl exible and no signs of any cracking should be visible. Investigate closer any white coloured areas that may appear on the internal condensate pipe work.
  • Page 60 6.1.1.6 INSPECT AND FLUSH DHW STORAGE TANK The storage tank should be inspected annually and cleaned if required. To gain access for inspection please carry out the following procedure: • Turn off the electrical supply to the appliance • Shut of the cold water supply to the tank •...

  • Page 61: Removing And Changing Components

    6.2 REMOVING AND CHANGING COMPONENTS DANGER NONE OF THE CONTROLS ARE REPAIRABLE . IF THEY ARE NOT FUNCTIONING THEY MUST BE REPLACED In all cases, before work commences turn off the mains electricity and gas supply. The following items do not require isolating water before removal: 1.
  • Page 62 6.2.2 FLUE TEMPERATURE SENSOR (B8) This is located at the Flue outlet of the heat exchanger. • Unplug the sensor from the loom (squeeze the catch to release). Connector Flue sensor • Remove sensor by unscrewing anti-clockwise • Replacement is the reverse. 6.2.3 COMMON FLOW TEMPERATURE SENSOR (B10) This is located on the top left hand side of the case, to the left of the top control PCB •...
  • Page 63 6.2.5 LMS14 PCB MASTER & SLAVE REPLACEMENT ATTENTION Electrostatic sensitive PCB - Handle PCB by edges only and if available wear an earth wristband This is located on the bridge. It is important that the correct PCB replacement is used. Check that the model matches the replacement PCB •...
  • Page 64 6.2.6 SPARK GENERATOR Power connections: • Remove the power connections Pink • Remove the ignition cable White = 2 • Remove the 2 fi xing screws Fixing screws • Replacement is the reverse 6.2.7 COMBUSTION FAN The combustion fan is best removed when the whole burner assembly has been detached from the heat ex- changer (see 6.1.1.1), but can also be removed individually if these steps are followed: •...
  • Page 65 6.2.8 GAS VALVE • Turn off the gas supply at the burner gas cock isolator Electrical connector 4 x securing bolts • Carefully remove the electrical connectors of the gas valve • Remove the allen bolts securing the gas pipe to the valve •...
  • Page 66 6.2.10 BACK FLOW PREVENTION VALVE • Remove the 8 Torx screws holding the cover plate onto the air arm and gently pull cover away from the seal. • The Back Flow Prevention Valve (BFPV) is located inside the cover itself and can be slid out for inspection. •...
  • Page 67 CAUTION Changing the following components will require some draining of the water system. After reassembly, it is essential that all the air is removed from the heat exchanger before the heater is operated. Failing to do so may damage the heat exchanger and invalidate the warranty. 6.2.12 HEAT EXCHANGER •...
  • Page 68 • Remove the 6 heat exchanger door bolts and remove the whole burner assembly and put to one side. Removed burner assembly • Unscrew the fl ow and return pipework from the heat exchanger. • Unscrew the fl ow and return sensors form the heat exchanger and retain •...
  • Page 69 6.2.13 CIRCULATION PUMP Q1 • Close the shut off valve before and after the pump (see 6.2.12) • Use the drain points between the shut off valves to remove water from the pump. • Remove the PWM and power connectors, using a small fl at blade screwdriver to lift the white tab before pulling each connector free.

  • Page 70: Flushing/Descaling The Heat Exchangers

    6.3 FLUSHING/DESCALING THE HEAT EXCHANGERS A fl ushing kit (P/N 7800417) is available from Andrews Water Heaters. This kit enables easier connection directly onto the heat exchanger and speeds up descaling. Follow the instructions provided in the kit. Flushing procedure (twin heat exchanger models)

  • Page 71: Component Parts Illustrations

    6.4 COMPONENT ILLUSTRATIONS TANK & SUNDRY SPARES 111b 112b Item No. Description Part Number RETURN SENSOR KIT 7720071 TEMP SENSOR DHW TANK B3 7709329 28MM OBTUSE COMP. ELBOW 7709372 OPTION - CASTOR ASSEMBLY 7709385 CONDENSATE TRAP 7617073 TEMPERATURE/PRESSURE RELIEF VALVE 10 BAR/95°C 7727952 111b 1”...
  • Page 72 6.4 COMPONENT ILLUSTRATIONS INNER COVER & DOOR SPARES Item No. Description Part Number DOOR FOR MAXXfl o EVO 150KW 7805974 DOOR CLOSING LATCH SET 7709375 DOOR HINGE SET 7709376 DOOR GASKET MAXXfl o EVO 300L 7709378 INNER COVER MAXXfl o EVO 300L 7709380 INNER COVER FIXING SCREWS 7709381...
  • Page 73 6.4 COMPONENT ILLUSTRATIONS (CONTINUED) GENERAL COMPONENTS Item No. Description Part Number CABLE GLAND 7709386 SPARK GENERATOR 7709314 LEAD FOR SPARK ELECTRODE 7709313 PRESS. SENSOR WATER 7709328 22MM RIGID FAN GAS COCK 7709371 PUMP FOR MAXXfl o EVO 7709310 PUMP / NRV GASKET 7720039 TEMP.
  • Page 74 6.4 COMPONENTS ILLUSTRATIONS (CONTINUED) DRAIN COMPONENTS FLUE COMPONENTS Item No. Description Part Number FLUE SYSTEM TWIN H/E MAXXfl o EVO 7709361 FLUE SEAL SET TWIN H/E MAXXfl o EVO 7709363 REMOVABLE 200MM AIR DUCT PLATE ASSY 7776499 CONDENSATE SYSTEM TWIN H/E 7818126 Maintenance MAXXfl...
  • Page 75 6.4 COMPONENTS ILLUSTRATIONS (CONTINUED) HEAT ENGINE SPARES 506c 509d 516c 519b 520d Maintenance MAXXfl o EVO 150/302...
  • Page 76 6.4 COMPONENTS ILLUSTRATIONS (CONTINUED) HEAT ENGINE SPARES (CONTINUED) Item No. Description Part Number TEMP. SENSOR FLOW RETURN B2/B7 7709317 TEMP. SENSOR FLUE B8 7709318 H/E SILICONE DOOR SEAL 7709294 H/E ROPE DOOR SEAL 7709295 H/E BURNER DOOR ASSY 7720060 H/E NUT SET FOR BURNER DOOR 7709297 506c BURNER FOR 75KW HEX...
  • Page 77 6.4 COMPONENTS ILLUSTRATIONS (CONTINUED) WIRING CENTRE SPARES 603f SLAVE SPARES 611c Item No. Description Part Number OCI345 COMMUNIC. DEV. C/W CABLE 7709285 MODBUS CLIP-IN MODULE KIT 7720069 OPTION - CLIP IN EXPANSION MODULE KIT 7720070 603f CONTROL PCB FOR MAXXfl o EVO 150 7805981 CONTROL PCB FUSES (2 PACK) 7709324...
  • Page 78 6.4 COMPONENTS ILLUSTRATIONS (CONTINUED) COPPER PIPEWORK SPARES 800b 802a 802b 816b 817c 807b 807a 809c Item No. Description Part Number 800b PIPE GAS MANIFOLD 150KW 7805983 802a PIPE UP. 30&45KW H/E GAS 22MM 7709352 802b PIPE UP. 60&75KW H/E GAS 22MM 7709353 807a PIPE LO 30&45KW H/E GAS 22MM...

  • Page 79: Recommended Spares Requirements

    6.5 RECOMMENDED SPARES REQUIREMENTS Emergency parts recommended to be kept on site The following components are recommended to ensure fast recovery times in the event of a heater compo- nent failure. An engineer attending a breakdown on site can immediately use the contents of the 1st aid kit to make a rapid repair.

  • Page 80: Error Codes

    6.6 ERROR CODES Error Error Code Description Diag. Notes Code Code Boiler temperature 1, sensor Other Boiler fl ow sensor (B2) is outside normal limits error Boiler fl ow sensor (B2) is short-circuit. Check connection for possible contamination or faulty sensor. Boiler fl...
  • Page 81 6.6 ERROR CODES (CONTINUED) Error Error Code Description Diag. Notes Code Code SLT Lockout 306 431 Electronic temperature limits exceeded. General overheating 432 433 issue. Check for pump operation, trapped air and heat ex- 434 435 changer blockages. Monitor temperatures of system to estab- 436 756 lish problem area.
  • Page 82 6.6 ERROR CODES (CONTINUED) Error Error Code Description Diag. Notes Code Code Loss of fl ame during opera- Count of loss-of-fl ame incidents exceeded (a maximum of 15 tion loss of fl ame incidents are permitted in a 24 hour period ) Flame lost in operation during safety time, before the start of the modulation phase.
  • Page 83 6.6 ERROR CODES (CONTINUED) Error Error Code Description Diag. Notes Code Code Fault input 1 User defi ned OZW672 input D1 has been activated. Fault input 2 User defi ned OZW672 input D2 has been activated. Unit in parameterisation mode 770 Code will be displayed when a programming stick is used but should clear when programming is complete.
  • Page 84 6.6 ERROR CODES (CONTINUED) Error Error Code Description Diag. Notes Code Code Extraneous light Ionisation current detected before whilst in standby mode. Check ionisation current (“Diagnostics producer” parameter 8329). If the current present is greater than 0.61 whilst the burner is in standby, turn off the gas supply to check gas valve is closing completely.
  • Page 85 SENSOR RESISTANCE VALUES NTC 10K Sensors NTC 20K Sensors (all sensors except for fl ue sensor) (fl ue sensor only) Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance (Ohms) (Ohms) (Ohms) (Ohms) 67,650 1,845 32,555 2,989 40,491 1,377 25,339 2,490 25,099 1,043 19,873...
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  • Page 88 FM00866 EMS514880 13755 April 2022...

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