MEGAFLO Eco Product Manual
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MEGAFLO Eco Product Manual

Unvented direct & indirect hot water cylinders
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MEGAFLO Eco
Unvented Direct & Indirect
Hot Water Cylinders
MEGAFLO Eco Product Guide

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Summary of Contents for MEGAFLO Eco

  • Page 1 MEGAFLO Eco Unvented Direct & Indirect Hot Water Cylinders MEGAFLO Eco Product Guide...
  • Page 2 Contents Product Specification ..................................Page 3 Installation and Commissioning Instructions ..........................Page 11 Maintenance and Servicing ................................Page 27 User Guide ......................................Page 37 Unvented Hot Water Cylinder...
  • Page 3 DIRECT, EXPLODED VIEW • Introduction • Checklist • General Requirements • Water Supply • Power Supply • The Environment • Specification and Dimensions Unvented Hot Water Cylinder...

  • Page 4: Component Checklist

    Building Regulation Part L. The MEGAFLO Eco 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 complete with all its necessary inlet and safety controls, electric immersion heater(s) and, for indirect units, a cylinder thermostat, thermal cut - out, 2-port motorised valve and wiring centre.

  • Page 5: General Requirements

    Storage and Handling Please take care when handling a packaged MEGAFLO Eco. The unit is heavy and must only be moved manually within safe working practices. If the unit is to be stored before installation, it must be placed on a secure, level surface and in a dry, frost free environment.

  • Page 6: Water Supply

    (see Figure 7 p.14). Branches to cold drinking outlets should be taken before the valve. Outlets situated higher than the MEGAFLO Eco unit will give outlet pressures lower than that at the heater, a 10m height difference will result in a 0.1 Mpa (1 bar) pressure reduction at the outlet fitting.

  • Page 7: 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) Pressure Relief Valve 0.8 MPa (8 bar) Temperature and Pressure Relief Valve set temp and pressure 90ºC / 1MPa (10 bar) Immersion heater rating (a.c.
  • Page 8 Ø 579 Figure 2 - MEGAFLO Eco Direct Temperature and Pressure Relief Valve 30° 45° Ø 579 Figure 3 - MEGAFLO Eco Indirect Temperature and Pressure Relief Valve 30° 27° 47° 45° Unvented Hot Water Cylinder...
  • Page 9 Table 2 - Dimensions TYPE DIMENSIONS (mm) SIZE DIRECT INDIRECT 125L 1102 125L 125L 1102 145L 1229 145L 1229 170L 1384 1020 170L 1020 1384 210L 1486 1095 1011 210L 1095 1486 1323 1738 1109 250L 1238 250L 1323 1738 1574 2053 1413...
  • Page 10 Unvented Hot Water Cylinder...
  • Page 11 • General Installation • Indirect Model • Direct Model • Commissioning Unvented Hot Water Cylinder...

  • Page 12: General Installation

    MEGAFLO Eco heater. If a balanced pressure cold water supply is required to a thermostatic shower mixer valve this may be teed off the supply to the MEGAFLO Eco immediately after the 3 bar Pressure Reducing Valve (see Figure 7, p. 14).
  • Page 13 8 Bar Pressure Relief Valve (see Figure 5 below) This should be installed between the 3 bar Pressure Reducing Valve and the MEGAFLO Eco cylinder. 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 7, p.
  • Page 14 Figure 7 - Schematic installation diagram using 3 bar Pressure Reducing Valve in conjunction with 8 bar Pressure Relief Valve Unvented Hot Water Cylinder...
  • Page 15 Drain Tap A drain tap is supplied and should be installed in the cold water supply to the MEGAFLO Eco unit between the 8 bar Pressure Relief Valve and the heater at as low a level as possible (see Figure 1, p. 5). It is recommended that the outlet point of the drain pipe work be at least 1 metre below the level of the heater (this can be achieved by attaching a hose pipe to the drain tap outlet spigot).

  • Page 16: Important Information

    T&P Relief Valve insulation A set of insulating components is supplied with the MEGAFLO Eco water heater and should be installed to gain maximum heat and energy saving benefits. See Figure 9 below, for installation instructions. Warnings i) Under no circumstances should the factory fitted Temperature and Pressure Relief Valve be removed other than by authorised Heatrae Sadia personnel.
  • Page 17 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 18 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 19 MUST be pumped. Gravity circulation will not work due to the special design of the primary heat exchanger. It is recommended that an air bleed point or automatic air vent is incorporated in the primary return pipework close to the MEGAFLO Eco unit. The boiler flow temperature should usually be set to 82ºC (maximum flow temperature to primary heat exchanger 88ºC).
  • Page 20 Immersion heater(s) The MEGAFLO Eco indirect units are supplied with an immersion heater which can be used as an alternative heat source should the boiler supply need to be isolated from the MEGAFLO Eco unit.The immersion heater is located within the controls housing, refer to, sections “Wiring and Operation”(see p. 22) for details of wiring and operation of the immersion heater.

  • Page 21: Wiring Centre

    Figure 13 - 2 port valve in conjunction with a 3 port mid-position valve system (“Y” Plan) MEGAFLO ECO INDIRECT THERMAL CONTROLS MEGAFLO ECO (DHW) 2-PORT (SUPPLIED FITTED) PROGRAMMER VALVE (SUPPLIED) Bl Br G O GY BLUE BROWN GREY ORANGE...
  • Page 22 DIRECT MODEL Immersion Heater(s) The MEGAFLO Eco is supplied with either one (D model), two (DD models), three (DDD models) or four (DDDD models) factory fitted immersion heaters. Each immersion heater is rated 3kW at 240V~. To remove the immersion heater: Open the cover to the upper immersion heater.
  • Page 23 DO NOT BYPASS THE THERMAL CUT-OUT(S) IN ANY CIRCUMSTANCES. DISCONNECT FROM THE MAINS SUPPLY BEFORE REMOVING ANY COVERS. NEVER ATTEMPT TO REPLACE AN IMMERSION HEATER OTHER THAN WITH THE RECOMMENDED MEGAFLO Eco SPARE PART. Figure 15- Schematic wiring diagram - Direct immersion heater with adjustment details Direct Wiring Layout 1.5mm²...
  • Page 24 Unvented Hot Water Cylinder...
  • Page 25 INDIRECT, EXPLODED VIEW • Maintenance • Fault Finding • Servicing • Spares • Benchmark Unvented Hot Water Cylinder...
  • Page 26 Switch off the electrical supply to the immersion heater(s) and shut down the boiler on indirect units. Turn off the mains water supply to the MEGAFLO Eco unit. Attach a hosepipe to the drain cock having sufficient length to take water to a suitable discharge point below the level of the unit, at least one metre below the unit is recommended.
  • Page 27 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 unvented water heater and its associated controls MUST be carried out by a competent installer for unvented water heating systems.
  • Page 28 Spares Spare parts A full range of spare parts are available for the MEGAFLO Eco 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 29 Figure 17 - Exploded View of 3 Bar Inlet Control Valve Pressure Reducing Valve Cartridge (3 Bar) 95:605:891 Strainer Mesh 95:605:889 3 Bar Pressure Reducing Valve - Complete 95:605:886 Figure 18 - Exploded View of 8 Bar Pressure Relief Valve Expansion Relief Cartridge 95:605:888 8 Bar Pressure Relief Valve, Complete...
  • Page 30 Figure 20: Indirect Exploded View Indirect Control Assembly For 210 Litre and above a further Boost Immersion Heater (direct control assembly) accessory is available 95:970:554 See diagram A on page 33 Terminal Cover (indirect) 95:614:118 Direct Combined Thermostat and Indirect Combined Thermal Cut-Out Thermostat and Mounting PLate...
  • Page 31 Figure21: Direct Exploded View Direct Control Assembly Mounting PLate 95:607:929 Terminal Cover (direct) 95:614:119 Direct Combined Thermostat Terminal Shroud and Thermal Cut-Out 95:606:993 95:612:717 Gasket 95:611:822 Titanium Immersion Backnut Heater - Upper 95:607:940 95:606:989 3 Way Terminal Block 95:607:932 Spare components are comman to Upper and Lower Direct Control Assemblies Except for the Upper elements 95:606:989 and Lower element 95:606:988...
  • Page 32 Unvented Hot Water Cylinder...
  • Page 33 Unvented Hot Water Cylinder...
  • Page 34 Spares Stockists Advanced Water Co.Ltd. Unit D5 Enterprise Way Vale Park, Evesham Worcs WR11 1GS Tel: 01386 760066 Fax: 01386 760077 Electric Water Heating Co. 2 Horsecroft Place Pinnacles Harlow Essex CM19 5BT Tel: 0845 0553811 E-Mail: sales@ewh.co.uk Special Product Division Units 9 &...
  • Page 35 • User Instructions • Guarantee • Customer Service Unvented Hot Water Cylinder...

  • Page 36: User Instructions

    Turn off the heat source to the cylinder via programmers / immersion isolation switch(es). ii) Turn off the water supply to the MEGAFLO Eco 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.
  • Page 37 • 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 38 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 39 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 40: Customer Service

    Customer service Telephone: Megaflo 0344 8711535 Hurricane Way Norwich Facsimile: Norfolk 0344 8711528 NR6 6EA E-mail: megafloservice@heateam.co.uk Important notice to installations outside of the UK. References to legislation, legal requirements, regulations, building regulations benchmark, spares stockists, guarantees and warranty are ONLY APPLICABLE WITHIN THE UK.

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