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MEGAFLO Eco SystemReady Product Manual

Unvented indirect hot water cylinders
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MEGAFLO Eco SystemReady
Unvented Indirect
Hot Water Cylinders
MEGAFLO Eco SystemReady Product Guide

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Summary of Contents for MEGAFLO Eco SystemReady

  • Page 1 MEGAFLO Eco SystemReady Unvented Indirect Hot Water Cylinders MEGAFLO Eco SystemReady Product Guide...
  • Page 2 Contents Product Specification ..................................Page 3 Installation and Commissioning Instrucions ..........................Page 12 Maintenance and Servicing ................................Page 27 User Guide ......................................Page 36 Unvented Hot Water Cylinder...
  • Page 3 • Introduction • Checklist • General Requirements • Water Supply • Power Supply • The Environment • Specification and Dimensions Unvented Hot Water Cylinder...

  • Page 4: The Benchmark Tm Scheme

    Building Regulation Part L. The Megaflo eco SystemReady SB unvented water heater can be fed directly from the cold water mains supply to the property without the need for separate feed cisterns or vent pipes. It is supplied fitted with all its necessary inlet and safety controls for compliance with Building Regulations.

  • Page 5: Component Checklist

    Component Check List Before commencing installation, check that all components for your Megaflo eco SystemReady SB unit are contained in the package. The following components are supplied: Factory Fitted: mmersion heater(s) and thermal controls • I • 8 Bar pressure relief valve (incorporating a check valve) (Figure 5) page 14 •...

  • Page 6: General Requirements

    The weight of the units are noted on Table 3, page 9. If you choose to install the Megaflo eco SystemReady SB in the highest point in the property (e.g. loft space), it is advisable to install an additional automatic air vent (AAV) (available as a spare, part number 95 605 050) above the pump to enable air to be removed from the system.

  • Page 7: Outlet / Terminal Fittings (Taps, Etc.)

    The Megaflo eco SystemReady SB has an operating pressure of 3 bar which is controlled by the 3 bar pressure reducing valve. The 3 Bar pressure reducing valve can be connected to a maximum mains supply pressure of 1.6 MPa (16 bar).

  • Page 8: Specifications And Dimensions

    Specifications and Dimensions Outline Specifications Maximum mains water supply pressure (to 3 bar pressure reducing valve) 1.6 MPa (16 bar) Operating pressure (pressure reducing valve set pressure – non adjustable) 0.3 MPa (3 bar) Expansion relief valve set pressure 0.8 MPa (8 bar) Temperature / pressure relief valve set temp / pressure 90ºC / 1MPa (10 bar) Immersion heater rating (a.c.
  • Page 9 Figure 2 - Megaflo eco SystemReady Indirect Ø 579 TEMPERATURE/PRESSURE RELIEF VALVE 30° 27° 47° 45° Dimensions (Plan View) DASHED LINE DENOTES MINIMUM SPACE REQUIREMENT Indirect Model(s) Energy efficiency class Storage volume V in litres 125.0 145.0 170.0 210.0 250.0 300.0...
  • Page 10 Table 3 - Technical Specification UNIT WEIGHT (kg) COIL SPECIFICATIONS SIZE RECOVERY (MINS) SURFACE (SQ/M) RATING (kW) EMPTY FULL HEAT-UP (MINS) 18.3 125L 0.58 145L 0.72 18.7 24.3 170L 0.79 24.3 210L 0.79 250L 0.79 23.9 300L 0.79 24.5 NOTE Coil heating performance based on a primary flow rate of 15L/min at 80°C.
  • Page 11 NOTES. Unvented Hot Water Cylinder...
  • Page 12 • General Installation • Commissioning Unvented Hot Water Cylinder...

  • Page 13: General Installation

    The 3 bar pressure reducing valve can be connected anywhere on the cold water mains supply prior to the Megaflo eco SystemReady SB unit. There is no requirement to site it close to the unit, it can be located at a point where the mains supply enters the premises if this is more convenient but you must install a non-return valve just after the reducing valve for ease of maintenance.
  • Page 14 8 bar pressure relief valve (See Figure 5 below) Should a balanced pressure cold water draw off supply be required for the cold water outlets, this should be taken off between the 3 bar pressure reducing valve and 8 bar pressure relief valve (see Figure 6, page 15). Branches to drinking water outlets should be taken before the valve to avoid the possibility of warm expanded water being drawn from the tap.
  • Page 15 Figure 6 - Schematic installation diagram using 3 Bar Pressure Reducing Valve in conjunction with 8 Bar Pressure Relief Valve Unvented Hot Water Cylinder...

  • Page 16: Check Valve

    Outlet Pipework Ideally the pipework from the Megaflo eco SystemReady SB to the outlet fittings should be in 22mm pipe with short runs of 15mm pipe to showers and basin taps. Small bore pipe can also be used to suit some taps, but runs should be of minimum length.
  • Page 17 Under no circumstances should the factory fitted temperature / pressure relief valve be removed other than by authorised heateam personnel. To do so will invalidate any guarantee or claim. ii) The 3 bar pressure reducing valve must be fitted to the mains water supply to the Megaflo eco SystemReady SB unit.
  • Page 18 The following extract is taken from the latest G3 Regulations Discharge pipes from safety devices Discharge pipe D1 3.50 Safety devices such as temperature relief valves or combined temperature and pressure and pressure relief valves (see paragraphs 3.13 or 3.18) should discharge either directly or by way of a manifold via a short length of metal pipe (D1) to a tundish. 3.51 The diameter of discharge pipe (D1) should be not less than the nominal outlet size of the temperature relief valve.

  • Page 19: Discharge Pipework

    Discharge Pipework It is a requirement of Building Regulations that any discharge from an unvented system is conveyed to where it is visible, but will not cause danger to persons in or about the building. The tundish and discharge pipes should be fitted in accordance with the requirements and guidance notes of Building Regulations.

  • Page 20: Installation-Primary Circuit

    MUST be fitted to the primary flow to the indirect coil. This valve is factory wired in series with the indirect thermal cut-out such that the primary flow to the heating coil is interrupted should the Megaflo eco SystemReady SB unit overheat.

  • Page 21: Heating System Controls

    Heating System Controls The controls provided with the Megaflo eco SystemReady SB will ensure the safe operation of the unit within a central heating system. Connection to the various system components is made via the wiring centre fitted to the front of the Megaflo eco SystemReady SB (see Figure 14, page 23) and the terminal identification labels within the wiring centre to aid in connecting the various external system components such as the mains supply, programmer and boiler.
  • Page 22 Figure 11 - Indirect Wiring Layout Control Housing Details Element connections Indirect control 1.5mm² 3 core wiring HOFR sheathed cable Figure 12 - Adjustment details Thermal cut-out reset button Spindle positions = Minimum temp = Maximium temp = Approx 60°C Rotate spindle clockwise for temperature increase and counter-clockwise...
  • Page 23 Figure 13 - Schematic Wiring Diagram - Indirect Circuit PROGRAMMABLE PROGRAMMER - HEATING ZONE 1 MEGAFLO INDIRECT MEGAFLO (DHW) & DOMESTIC HOT WATER ROOM THERMOSTAT THERMAL CONTROLS ZONE VALVE (NOT SUPPLIED) FOR ZONE 2 (SUPPLIED FITTED) (SUPPLIED FITTED) (NOT SUPPLIED)
  • Page 24 The primary flow to the Megaflo eco SystemReady SB should become hot, if it does not, check for a wiring or piping error. Allow the Megaflo eco unit to heat up and check that the hot water thermostat and 2-Port motorised valve operate correctly.
  • Page 25 Benchmark Log Book On completion of the installation and commissioning procedures detailed in this manual, the Benchmark “Installation, Commissioning and Service Record Log, pages 34 and 35” should be completed and signed off by the competent installer or commissioning engineer in the relevant sections. The various system features, location of system controls, user instructions and what to do in the event of a system failure should be explained to the customer.
  • Page 26 NOTES. Unvented Hot Water Cylinder...
  • Page 27 • Maintenance • Fault Finding • Servicing • Spares • Benchmark Unvented Hot Water Cylinder...

  • Page 28: Maintenance Maintenance Requirements

    In hard water areas consideration should be given to periodically descaling the immersion heater elements. To do this the Megaflo eco SystemReady SB unit will need to be drained, details below list how to drain the unit and remove the immersion heater(s).

  • Page 29: Fault Finding

    The Fault Finding chart (Table 6 below) will enable operational faults to be identified and their possible causes rectified. Any work carried out on the Megaflo eco SystemReady SB unvented water heater and its associated controls MUST be carried out by a competent installer for unvented water heating systems. In case of doubt contact the Megaflo eco SystemReady SB Service Department, Section 4, page 40.
  • Page 30 Spares Spare parts A full range of spare parts are available for the Megaflo eco SystemReady SB range. Refer to the Technical Data label on the unit to identify the model installed and ensure the correct part is ordered. Description Part no.
  • Page 31 Pressure Reducing Valve Cartridge (3 Bar) Strainer Mesh Figure 15 - Exploded view of 3 Bar Inlet Control Valve 3 Bar Pressure Reducing Valve - Complete 95:605:886 Figure 16 - Exploded View of 8 Bar Pressure Relief Valve Expansion Relief Cartridge 8 Bar Pressure Relief Valve, Complete 95:605:893 Isolating valve can be used either with...
  • Page 32 Figure 18: Indirect Exploded View Indirect Control Assembly For 210 litre and above a further indirect control assembly accessory is available 95:970:554 Direct combined Mounting plate (indirect) thermostat and 95:607:931 thermal cut-out Indirect combined 95:612:717 thermostat and thermal cut-out Terminal cover (indirect) 95:612:716 95:614:118 Backnut...
  • Page 33 Figure 19: SystemReady Exploded View 8 bar pressure relief valve T&P Valve 95:605:893 95:605:810 Filling loop and connections Tundish 95:607:096 95:605:838 Wiring centre 95:612:702 2 port motorised valve (22mm connections) 95:605:819 Drain valve 95:605:051 Unvented Hot Water Cylinder...
  • Page 34 Unvented Hot Water Cylinder...
  • Page 35 Unvented Hot Water Cylinder...
  • Page 36 Spares Stockists Electric Water Heating Co. 2 Horsecroft Place Pinnacles Harlow Essex CM19 5BT E-Mail: sales@ewh.co.uk Special Product Division Units 9 & 10 Hexagon Business Centre Springfield Road Hayes Middlesex UB40 0TY Parts Center Network 65 Business Park Bentley Wood Way Burnley Lancashire BB11 5ST...
  • Page 37 • User Instructions • Guarantee • Customer Service Unvented Hot Water Cylinder...

  • Page 38: User Instructions

    Indirect units are fitted with an indirect thermostat which controls a 2-port motorised valve and hence the temperature of the water in the Megaflo eco SystemReady SB unit. The thermostat is factory set to give a water storage temperature of...
  • Page 39 Turn off the heat source to the cylinder via programmers / immersion isolation switch(es). ii) Turn off the water supply to the Megaflo eco SystemReady SB unit by turning off the isolating valve on the 3 bar pressure reducing valve if fitted at this point or at the 8 bar pressure relief valve if fitted there. Turn the blue handle so that it lies at 90º...
  • Page 40 • The MEGAFLO product has not been modified or tampered with in any way, other than by a Heatrae Sadia or Baxi Customer Support approved engineer.
  • Page 41 Baxi Group Baxi Customer Support approved engineer in accordance with the requirements set out in the maintenance section of the installation instructions. • Access is available, at reasonable times and upon reasonable notice, to the MEGAFLO product to allow for any inspection repair or replacement.
  • Page 42 Please contact Baxi Customer Support on 0844 871 1535 for details. *In domestic† properties, lifetime is the period during which the first owner of the MEGAFLO or new build home continues to own the property. Should the property be sold, the new owner and any subsequent owners will receive a 30 year warranty from the date the original owner purchased the MEGAFLO or new home with a MEGAFLO installed.
  • Page 43 Notes Unvented Hot Water Cylinder...

  • Page 44: Customer Service

    Customer service Telephone: Megaflo 0344 8711535 Hurricane Way Norwich Facsimile: Norfolk 0344 8711528 NR6 6EA E-mail: megafloservice@heateam.co.uk 36006169 _issue_04...

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