Heatrae Sadia Megaflo Eco Solar Series Product Manual
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Heatrae Sadia Megaflo Eco Solar Series Product Manual

Unvented direct & indirect solar hot water cylinders
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Unvented Direct & Indirect Solar
Hot Water Cylinders
Megaflo Product Guide

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Summary of Contents for Heatrae Sadia Megaflo Eco Solar Series

  • Page 1 Unvented Direct & Indirect Solar Hot Water Cylinders Megaflo Product Guide...
  • Page 2 Contents Product Specification ..................................Page 3 Installation and Commissioning Instrucions ..........................Page 11 Maintenance and Servicing ................................Page 27 User Guide ......................................Page 36...
  • 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

    THE BENCHMARK SCHEME Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer’s instructions by competent persons and that it meets the requirements of the appropriate Building Regulations.

  • Page 5: General Requirements

    General Requirements Important: Please read and understand this product guide before installing the MEGAFLO Eco Solar water heater. Incorrect installation may invalidate the guarantee. This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of knowledge and experience, unless they have been given supervision or instruction concerning the use of the appliance by a person responsible for their safety.

  • Page 6: Outlet / Terminal Fittings (Taps, Etc.)

    Outlet / Terminal Fittings (Taps, Etc.) The MEGAFLO Eco Solar can be used in conjunction with most types of terminal fittings. It is advantageous in many mixer showers to have balanced hot and cold water supplies, in these instances the balanced cold water supply should be teed off the supply to the MEGAFLO Eco Solar immediately after the Cold Water Combination Valve (See Figure 7 p.14).

  • Page 7: Specifications And Dimensions

    Specifications and Dimensions Outline Specifications Maximum mains water supply pressure (to 3 Bar Pressure ) 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 8 Fig 2 - Megaflo eco Solar Direct Fig 3 - Megaflo eco Solar Indirect Unvented Hot Water Cylinder...
  • Page 9 TABLE 2 - DIMENSIONS DIMENSIONS (m m ) SIZE TYPE Direct 1229 Indirect 1387 1020 Direct 1489 1103 1184 Indirect 1095 1489 1184 1039 Direct 1802 1167 1441 Indirect 1068 1258 1738 1378 1142 Direct 2053 1444 1693 Indirect 2053 1255 1693 1573...
  • Page 10 NOTES. Unvented Hot Water Cylinder...
  • Page 11 • General Installation • Indirect Model • Direct Model • Commissioning Unvented Hot Water Cylinder...

  • Page 12: General Installation

    General Installation Pipe Fittings All pipe connections to the MEGAFLO Eco Solar are made via 22mm compression fittings directly to the unit (nuts and olives supplied). The fittings are also threaded ” BSP male parallel should threaded pipe connections be required. Cold Water Supply A 22mm cold water supply is recommended, however, if a 15mm ( ”) supply exists which provides sufficient flow (see Section1 p.6 “Water...
  • 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 Solar 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. 14). Branches to drinking water outlets should be taken before the Pressure Relief Valve to avoid the possibility of warm expanded water being drawn from the tap.
  • 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 Solar 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 See Figure 9 below, for installation instructions. Warnings i) Under no circumstances should the factory fitted Temperature /Pressure Relief Valve be removed other than by authorised Heatrae Sadia personnel. To do so will invalidate any guarantee or claim.
  • 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 Worked example of discharge pipe sizing The example on page 18 is for a G temperature relief valve with a discharge pipe (D2) having 4 No. elbows and length of 7m from the tundish to the point of discharge. From Table 5: Maximum resistance allowed for a straight length of 22mm copper discharge pipe (D2) from a G temperature relief valve is 9m.
  • Page 20 Unvented Hot Water Cylinder Wiring All electrical wiring should be carried out by a competent electrician and be in accordance with the latest I.E.E. Wiring Regulations. The MEGAFLO Eco Solar Indirect combined thermostat and thermal cut-out are factory pre-wired. The 2-port motorised valve supplied MUST be wired in series with the Indirect controls such that the power supply to the valve is interrupted should either the Thermostat or Thermal cut-out operate.
  • Page 21 5. DO NOT MOUNT WIRING CENTRE ON CYLINDER. 6. THE ABOVE DIAGRAM IS FOR GUIDANCE ONLY, HEATRAE SADIA ACCEPT NO LIABILITY FOR ANY LOSS OR DAMAGE ARISING FROM ANY ERRORS OR OMISSIONS. THAT MAY BE INADVERTENTLY CONTAINED WITHIN THIS DIAGRAM. THE VARIOUS EQUIPMENT MANUFACTURERS SHOULD BE CONSULTED TO CONFIRM THE CORRECT OPERATION OF THEIR PRODUCTS WITHIN THE SYSTEM.

  • Page 22: Direct Model

    DIRECT MODEL Immersion Heater(s) The MEGAFLO Eco Solar Direct is supplied with either one (D models) or two (DD 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. Disconnect the two wires to element tabs, pull out the two thermostat capillaries (remember which way round they go) and move out of the way.

  • Page 23: Maximum Temp

    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 HEATRAE SADIA MEGAFLO Eco SOLAR SPARE PART Figure 15 - Schematic wiring diagram - Direct immersion heaters, with adjustment details Direct Wiring Layout 1.5mm²...

  • Page 24: Control Assembly

    SOLAR PRIMARY CONNECTION TO THE SOLAR PRIMARY CIRCUIT The lower (Solar) coil of the MEGAFLO Eco Solar must be connected to a fully pumped solar primary circuit. The connections are suitable for a 22mm copper pipe direct to compression fittings provided. The connections are also threaded 3/4” BSP male parallel should BSP connections be required.
  • Page 25 Commissioning Filling and flushing the MEGAFLO Eco Solar Ensure that all fittings and immersion heaters are correctly fitted and tightened. An immersion heater key spanner is provided to aid in tightening the immersion heater(s). i) Open a hot tap furthest from the MEGAFLO Eco Solar. ii) Open the isolating valve on the 3 Bar Pressure Reducing Valve by turning the blue handle on the stop cock (if fitted in this position) so that it lies parallel to the direction of flow.
  • Page 26 NOTES. Unvented Hot Water Cylinder...
  • Page 27 • Maintenance • Fault Finding • Servicing • Spares • Benchmark Unvented Hot Water Cylinder...
  • Page 28 Maintenance Maintenance requirements To ensure the continued optimum performance of the MEGAFLO Eco Solar it should be regularly maintained. This is of particular importance in hard water areas or where the water supply contains particulate matter. Maintenance should be carried out by a competent person and any replacement parts used should be authorised MEGAFLO Eco Solar spare parts.
  • 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 Solar unvented water heater and its associated controls MUST be carried out by a competent installer for unvented water heating systems.
  • Page 30 Servicing Important i) Servicing should only be carried by authorised BAXI CUSTOMER SUPPORT engineers, agents or by installers competent in the installation and maintenance of unvented water heating systems. ii) Any spare parts used MUST be authorised MEGAFLO Eco Solar parts. iii) Disconnect the electrical supply before removing any electrical equipment covers.
  • Page 31 Figure 18 - 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 19 - Exploded View of 8 Bar Pressure Relief Valve Expansion Relief Cartridge 95:605:888 8 Bar Pressure Relief Valve, Complete...
  • Page 32 Figure 21: Indirect Exploded View 1/2”BSP Sensor Pocket Assembly Short 95:607:938 Direct Combined Indirect Combined Thermostat and Thermostat and Thermal Cut-Out Thermal Cut-Out 95:612:717 95:612:716 Mounting Plate (Indirect) Terminal cover 95:607:929 95:614:118 6 Way Terminal Block 95:607:933 Gasket 95:611:822 Incoloy Immersion Heater, Lower Backnut 95:606:984...
  • Page 33 Figure22: Direct Exploded View 1/2”BSP Sensor Pocket Assembly Short 95:607:938 Direct Combined Thermostat and Thermal Cut-Out 95:612:717 Mounting Plate (Direct) 95:607:929 Titanium Immersion Heater (Upper) Three Way Terminal Block 95:606:989 95:607:932 Gasket Backnut Terminal cover 95:611:822 95:607:940 Direct Combined 95:614:119 Thermostat and Thermal Cut-Out Mounting Plate (Direct)
  • Page 34 Unvented Hot Water Cylinder...
  • Page 35 Unvented Hot Water Cylinder...
  • Page 36 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 37 • User Instructions • Guarantee • Customer Service Unvented Hot Water Cylinder...
  • Page 38 IMPORTANT LEGAL REQUIREMENT FOR INSTALLERS MEGAFLO Eco Solar, a trading name of Heatrae Sadia, a licensed member of the Benchmark Scheme which aims to improve the standards of installation and commissioning of domestic heating and hot water systems in the UK and to encourage regular servicing to optimise safety, efficiency and performance.
  • Page 39 Guarantee Terms Heatrae Sadia guarantees the MEGAFLO Eco Solar against faulty manufacture or materials for a period of two years from the date of purchase including parts and labour. This two year guarantee is extended to five years for the cold water control valve and to lifetime* for the stainless steel inner vessel in domestic properties and to 30 years for the stainless steel inner vessel in commercial buildings.

  • Page 40: Customer Service

    Customer service Telephone: Megaflo 0844 8711535 Hurricane Way Norwich Facsimile: Norfolk 0844 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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