Related Manuals for Heatrae Sadia Megaflo solar
Summary of Contents for Heatrae Sadia Megaflo solar
- Page 1 Solar Fitting and using the Megaflo Solar unvented mains pressure water heater 36005942 issue 5 36 00 5823 Issue 4...
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Page 2: Table Of Contents
Please read and understand these instructions before starting work. The information contained in these instructions details how to connect the Megaflo Solar water heater to a solar primary circuit. Other controls will be necessary to provide control over the primary circuit, refer to the instructions supplied with the solar controls and ancillary equipment for details of how to integrate them with the Megaflo Solar unit. -
Page 3: Introduction
Introduction Congratulations on your purchase of a Heatrae Sadia Megaflo Solar unvented water heater. The Megaflo Solar is manufactured in the UK from top quality materials and meets all the latest relevant safety and constructional standards. The high grade Duplex stainless steel cylinder offers exceptional strength and corrosion resistance which is backed by a 25 year guarantee. -
Page 4: General Requirements
See section 3.9 for more information. To aid installation the Megaflo Solar is provided with lifting points located in the base moulding and a lifting handle. The lifting handle should be fully threaded onto the outlet boss before use. Once the Megaflo Solar is suitably positioned the lifting handle should be removed to allow connection of the outlet pipework. - Page 5 The Megaflo Solar has an operating pressure of 0.3 MPa (3 bar) which is controlled by the Cold Wa- ter Combination Valve. The Cold Water Combination Valve can be connected to a maximum mains supply pressure of 1.6 MPa (16 bar).
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Page 6: Installation - General
The Cold Water Combination Valve can be connected anywhere on the cold water mains sup- ply prior to the Megaflo Solar 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. The Expansion Valve connection must not be used for any other purpose. - Page 7 Cold Water Combination Valve and the Megaflo Solar (Note direction of flow arrows). The cold water balanced draw off connection should be taken from between the Cold Water Combination Valve and the Expansion Core Unit (see Diagram 4). The Expan- sion Valve connection on the Cold Water Combination Valve should remain blanked off using the blanking nut and seal provided.
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- Page 10 3.5 DRAIN TAP A draining tap is supplied and should be installed in the cold water supply to the Megaflo Solar unit between the Cold Water Combination Valve (or Expansion Core Unit if being used) and the heater at as low a level as possible (see Diagram 1). 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 11 3.10 WARNINGS 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. The Cold Water Combination Valve must be fitted to the mains water supply to the Megaflo Solar unit.
- Page 12 tech 3.11 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 13 Examples of acceptable discharge arrangements are: i. ideally below a fixed grating and above the water seal in a trapped gully. ii. downward discharges at low level; i.e. up to 100mm above external surfaces such as car parks, hard standings, grassed areas etc. are acceptable providing that where children may play or otherwise come into contact with discharges a wire cage or similar guard is positioned to prevent contact, whilst maintaining visibility.
- Page 14 tech Table 1 - Sizing of copper discharge pipe (D2) for common T&P relief valve sizes Valve outle t size Minim um size of Minim um size of Ma x im um Re sista nce discharge pipe discha rge pipe re sista nce cre ate d by e a ch D2 from tundish...
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Page 15: Installation - Solar Primary
Installation - Solar Primary 4.1 CONNECTION TO SOLAR PRIMARY CIRCUIT The lower (solar) coil of the Megaflo Solar must be connected to a fully pumped solar primary circuit. The connections are suitable for 22mm copper pipe direct to the compression fittings provided. -
Page 16: Installation - Direct Units
Installation - Direct units 5.1 IMMERSION HEATER(S) The Megaflo Solar Direct is supplied with two factory fitted immersion heaters. Each immersion heater is rated 3kW at 240V. To remove the immersion heater: Ensure the cylinder is drained of water first. Open the cover to the upper immersion heater. - Page 17 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 SOLAR SPARE PART. Diagram 10 - EARTH...
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Page 18: Installation - Auxillary Coil (Indirect Units)
It is recommended that an air bleed point or auto- matic air vent is incorporated in the primary return pipework close to the Megaflo Solar unit. The boiler flow temperature should usually be set to 82... - Page 19 6.5 IMMERSION HEATER The Megaflo Solar indirect units (CL models) 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 Solar unit. The immersion heater is located within the controls housing.
- Page 20 tech Diagram 13 - Indirect controls housing details INDIRECT THERMAL CUT-OUT RESET BUTTON INDIRECT THERMOSTAT THERMAL ADJUSTMENT CUT-OUT INDIRECT THERMOSTAT CABLE CLAMPS TERMINAL BLOCK NOTE: THE HOUSING COVER AND ELEMENT ASSEMBLY HAVE BEEN REMOVED FROM THIS VIEW FOR CLARITY...
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Page 23: Commissioning
7.2 CHECK THE OPERATION OF THE SAFETY VALVES Slowly manually open, for a few seconds, the Temperature and Pressure Relief Valve situated on the Megaflo Solar unit (see Diagram 17). Check water discharged runs freely away through the tundish and discharge pipework. Close valve, ensure water flow stops and valve reseats correctly. - Page 24 Fill the auxiliary heating (indirect) primary circuit following the boiler manufacturer’s commis- sioning instructions. To ensure the auxiliary primary heating coil in the Megaflo Solar is filled the 2-port motorised valve (supplied) should be manually opened by moving the lever on the motor housing to the MAN OPEN setting.
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Page 25: User Instructions
Indirect units (CL models) are fitted with an Indirect Thermostat which controls a 2-port motorised valve and hence the temperature of the water in the Megaflo Solar unit when heated using the auxiliary heating coil. The thermostat is factory set to give a water storage temperature of approx. - Page 26 If after following the above actions water still discharges from the Expansion Relief Valve further advice should be sought from a competent installer or the Heatrae Sadia service department.
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Page 27: Maintenance
In hard water areas consideration should be given to periodically descaling the immersion heater elements. To do this the Megaflo Solar unit will need to be drained, 9.4 and 9.5 detail how to drain the unit and remove the immersion heater(s). - Page 28 9.8 BENCHMARK LOG BOOK On completion of any maintenance or service of the Megaflo Solar the Benchmark “Instal- lation, Commissioning and Service Record Log Book” should be filled in to record the actions taken and the date the work was undertaken.
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Page 29: Fault Finding & Servicing
Caution must be taken when drawing water from the unit. 10.2 SPARE PARTS A full range of spare parts are available for the Megaflo Solar range. Refer to the Technical Data label on the unit to identify the model installed and ensure the correct part is ordered. - Page 30 The Fault Finding chart overleaf (Table 2) will enable operational faults to be identified and their possible causes rectified. Any work carried out on the Megaflo Solar unvented water heater and its associated controls MUST be carried out by a competent installer for unvented water heating...
- Page 31 Table 2 - Fault Finding Chart F A U L T P O S S IB L E C A U S E R E M E D Y N o hot w ater ow 1. M ains s upply o 1.
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Page 32: Dimensions & Specifications
tech Dimensions & Specifications Diagram 17 - Dimensions Direct units SOLAR PRIMARY RETURN SOLAR PRIMARY FLOW 3 T&P VALVE 4 BOOST IMMERSION HEATER 5 AUXILLARY IMMERSION HEATER 6 INLET 7 SOLAR CONTROL HOUSING Ø550 Indirect units SOLAR PRIMARY RETURN SOLAR PRIMARY FLOW AUXILLARY BOILER RETURN AUXILLARY BOILER FLOW T&P VALVE... - Page 33 Table 3 - Dimensions DIMENSIONS (m m ) SIZE TYPE Direct 1205 Indirect 1372 1019 Direct 1473 1000 1184 Indirect 1473 1184 1095 Direct 1777 1130 1439 Indirect 1731 1160 1391 1258 Direct 2038 1409 1715 Indirect 2038 1438 1023 1715 1573 Table 4 - Direct units - Technical specifications...
- Page 34 tech OUTLINE SPECIFICATIONS Maximum mains water supply pressure (to Cold Water Combination 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 C/ 1 MPa (10 bar) Immersion heater rating (a.c.
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Page 35: Guarantee
12.2 GUARANTEE TERMS Heatrae Sadia guarantee the electrical parts, thermal controls and valves for a period of two years, excluding the cold water control valve which is guaranteed for a period of five years, from the date of purchase, with the exception of damage due to scaling. -
Page 36: Contacts
E-mail: heatraesadiaservice 2 Horsecroft Place, Pinnacles, @heateam.co.uk Harlow, Essex CM19 5BT ADDRESS Tel: 0845 0553811 Heatrae Sadia Heating E-mail: sales@ewh.co.uk Hurricane Way Norwich Norfolk Special Products Division, NR6 6EA Units 9 & 10 Hexagon Business Centre, Springfield Road, Hayes, Middlesex...