MegaTech Solar series Installation Manual

Fitting and using the megatech solar unvented mains pressure water heater

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Solar

Fitting and using the Megatech Solar unvented

mains pressure water heater

36005942 issue 4

36 00 5823 Issue 4

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Page 1 Solar Fitting and using the Megatech Solar unvented mains pressure water heater 36005942 issue 4 36 00 5823 Issue 4...
Page 2: Table Of Contents
Megatech Solar unit. Please leave this leaflet with the user following installation...
Page 3: Introduction
Introduction Congratulations on your purchase of a Heatrae Sadia Megatech Solar unvented water heater. The Megatech 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 Megatech 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 Megatech Solar is suitably positioned the lifting handle should be removed to allow connection of the outlet pipework.
Page 5 The Megatech Solar has an operating pressure of 0.3 MPa (3 bar) which is controlled by the Cold Water Combination Valve. The Cold Water Combination Valve can be connected to a maximum mains supply pressure of 1.6 MPa (16 bar).
Page 6: Installation - General
The Cold Water Combination Valve can be connected anywhere on the cold water mains supply prior to the Megatech 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 Megatech 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 Expansion 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 Megatech 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 The Cold Water Combination Valve must be fitted to the mains water supply to the Megatech unit. iii) No control or safety valves should be tampered with. iv) Water may drip from the discharge pipe of the pressure relief device (Expansion Valve) and this pipe must be left open to atmosphere.
Page 12 tech 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 tech 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 tech Table 1 - Sizing of copper discharge pipe (D2) for common T&P relief valve sizes Va lve outle t size Minim um size of Minim um size of Ma x im um Re sista nce discha rge pipe discha rge pipe re sista nce cre a te d by e a ch...
Page 15: Installation - Solar Primary
Installation - Solar Primary 4.1 CONNECTION TO SOLAR PRIMARY CIRCUIT The lower (solar) coil of the Megatech Solar must be connected to a fully pumped solar primary circuit. The connections (see diagram 17) are suitable for 22mm copper pipe direct to the compres- sion fittings provided.
Page 16: Installation - Direct Units
Installation - Direct units 5.1 IMMERSION HEATER(S) The Megatech 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. Unplug the thermostat from the element by gently pulling the thermostat outwards.
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 MEGATECH SOLAR SPARE PART. Diagram 10 - EARTH...
Page 18: Installation - Auxillary Coil (Indirect Units)
(Indirect units) 6.1 BOILER SELECTION The Megatech Solar Indirect (CL) models are supplied with an auxiliary heating coil suitable for use with most gas or oil fired boilers compatible with unvented systems i.e. fitted with a temperature control thermostat and thermal cut-out.
Page 19 The Megatech Solar is compatible with most heating controls, examples of electrical circuits are given in Diagrams 14 and 15. However, other systems may be suitable, refer to the controls manufacturer’s instructions, supplied with the controls selected, for alternative system wiring schemes.
Page 20 tech 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
VALVES Slowly manually open, for a few seconds, the Temperature and Pressure Relief Valve situated on the Megatech 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 AUTO position. Vent any trapped air by opening the air bleed. Switch on the boiler, ensure the programmer is set to Domestic Hot Water. Allow the Megatech unit to heat up and check that the indirect thermostat and 2-Port motorised valve operate correctly. A storage temperature of approx.
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 Megatech unit when heated using the auxiliary heating coil. The thermostat is factory set to give a water storage tempera- ture of approx.
Page 26 tech tech terminal cover. DO NOT remove the cover without first switching off the electrical supply. Temperature adjustment is made by inserting a flat bladed screwdriver in the adjustment knob located on the front of the thermostat mounting bracket (see Diagram 13) and rotating. At the minimum position the temperature will be approx.
Page 27: Maintenance
In hard water areas consideration should be given to periodically descaling the immersion heater elements. To do this the Megatech unit will need to be drained, 9.4 and 9.5 below detail how to drain the unit and remove the immersion heater(s).
Page 28 Unscrew immersion heater backnut(s) and remove immersion heater from the unit. A key spanner is supplied with the Megatech unit for easy removal/tightening of the immersion heater(s). Over time the immersion heater gasket may become stuck to the mating surface.
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 Megatech 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 Megatech Solar unvented water heater and its associated controls MUST be carried out by a competent installer for unvented water heating systems. In case of...
Page 31 tech 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 flow 1. M ains s upply off 1.
Page 32: Dimensions & Specifications
tech 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...
Page 33 tech Table 3 - Dimensions DIMENSIONS (m m ) SIZE TYPE Direct 1372 1019 Indirect 1372 1019 Direct 1473 1000 1184 Indirect 1473 1095 1184 Direct 1731 1072 1391 Indirect 1731 1160 1258 1391 Direct 2038 1409 1715 Indirect 2038 1438 1023 1573...
Page 34 tech 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.
Page 35: Guarantee
tech Guarantee 12.1 WARNING Should the factory fitted Temperature and Pressure Relief Valve be tampered with or removed your guarantee will be invalidated. Neither the Distributor or Manufacturer shall be responsible for any consequential damage howsoever caused. 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
tech tech Contacts CUSTOMER SERVICE SPARES STOCKISTS Tel: 0844 8711535 Fax: 0844 8711528 Electric Water Heating Co. 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...