Related Manuals for MEGAFLO DD
Summary of Contents for MEGAFLO DD
- Page 1 Unvented Direct & Indirect Hot Water Cylinders Megaflo Product Guide For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
- Page 2 Contents Product Specification ..................................Page 3 Installation and Commissioning Instructions ..........................Page 11 Maintenance and Servicing ................................Page 27 User Guide ......................................Page 36 For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
- Page 3 DIRECT, EXPLODED VIEW • Introduction • Checklist • General Requirements • Water Supply • Power Supply • The Environment • Specification and Dimensions Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
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Page 4: Component Checklist
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: Outlet / Terminal Fittings (Taps, Etc.)
Cold Water Combination Valve (See figures 7 page 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 / Pressure Relief Valve set temp / pressure 90ºC / 1MPa (10 bar) Immersion heater rating (a.c. - Page 8 Ø 579 Figure 2 - Megaflo eco Direct TEMPERATURE/PRESSURE RELIEF VALVE 30° 45° Ø 579 Figure 3 - Megaflo eco Indirect TEMPERATURE/PRESSURE RELIEF VALVE 30° 27° 47° 45° Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
- Page 9 A SECOND ELEMENT KIT CAN BE PURCHASED, KIT NO 95970554 Table 3 - Direct Units - Technical Specification HEAT UP TIMES (RECOVERY 70% DRAW-OFF), MINS UNIT WEIGHT (kg) BOOST MODEL D MODEL DD MODEL DDD MODEL DDDD SIZE (3kW) (3kW)
- Page 10 noteS. Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
- Page 11 • General Installation • Indirect Model • Direct Model • Commissioning Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
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Page 12: General Installation
Valve is installed with the direction of flow arrows (stamped on the side of the brass body) pointing towards the 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, page 14). - Page 13 8 Bar Pressure Relief Valve (See Figure 5) 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, page 14).
- 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 For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
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Page 15: Cold Water Inlet
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, page 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 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 /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.
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Page 19: Indirect Model
Boiler Selection The Megaflo eco Indirect (CL) models are 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. If in doubt consult the boiler manufacturer. Solid fuel boilers or any other boiler in which the energy input is not under effective thermostatic control, unless additional and appropriate safety measures are installed, SHOULD NOT be used. - Page 20 The Megaflo eco 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 eco unit. The immersion heater is located within the controls housing. Refer to Secion 2, page 22 “Wiring and operation”...
- Page 21 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) VALVE (SUPPLIED) PROGRAMMER Bl Br G O GY BLUE BROWN GREY ORANGE...
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Page 22: Direct Model
DIRECT MODEL Immersion Heater(s) The Megaflo eco is supplied with either one (D model), two (DD models), three (DDD models) or four (DDDDmodels) 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: 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 SPARE PART Figure 15 - Schematic wiring diagram - Direct immersion heaters with adjustment details Direct Wiring Layout 1.5mm²... - Page 24 When the primary circuit is full return the lever to the 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 Megaflo eco unit to heat up and check that the indirect thermostat and 2-port motorised valve operate correctly.
- Page 25 noTES. Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
- Page 26 noTES. Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
- Page 27 INDIRECT, EXPLODED VIEW • Maintenance • Fault Finding • Servicing • Spares • Benchmark Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
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Page 28: Maintenance Requirements
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 29: Fault Finding
The fault finding chart (Table 6) 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 30 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 31 Pressure Reducing Figure 17 - Exploded View of 3 Bar Inlet Control Valve 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 Tee...
- Page 32 Figure 20: 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 Indirect Combined Thermal Cut-Out Thermostat and 95:612:717 Thermal Cut-Out Terminal cover (indirect) 95:612:716 95:614:118 Backnut...
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Page 33: Mounting Plate
Figure21: Direct Exploded View Direct Control Assembly Terminal Cover (direct) 95:614:119 Mounting Plate 95:607:929 95:612:717 Titanium Immersion Heater - Upper Backnut 95:606:989 Gasket 95:607:940 95:611:822 3 Way Terminal Block 95:607:932 Spare components are common to Upper and Lower Direct Control Assemblies Exept for the Upper element 95:606:989 and Lower element 95:606:988 Titanium Immersion... - Page 34 Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
- Page 35 Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
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Page 36: Spares Stockists
Spares Stockists 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 & 10 Hexagon Business Centre Springfield Road Hayes Middlesex UB40 0TY Tel: 0208 5730574 Parts Center network 65 Business Park Bentley Wood Way Burnley... - Page 37 • User Instructions • Guarantee • Customer Service Unvented Hot Water Cylinder For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
- Page 38 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 39 These guarantees are valid provided that: The Megaflo eco has been installed by a competent installer and as per the instructions contained in the installation manual and all relevant Codes of Practice and Regulations in force at the time of installation.
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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 © 2010 36006062_issue _7 For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818...
Need help?
Do you have a question about the DD and is the answer not in the manual?
Questions and answers
Hot water not coming
The available context does not provide specific reasons why hot water might not be coming from the MEGAFLO DD. However, it suggests consulting a competent installer or the Megaflo eco Service Department if issues persist.
Common potential causes might include issues with the immersion heater, thermostat, or water supply, but further details are not provided in the context.
For troubleshooting, follow the manual's guidance or seek professional assistance.
This answer is automatically generated