Heatrae Sadia Megaflo solar Installation Manua Download Page 30 | Manualshive

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Fault Finding & Servicing

10.3 FAULT FINDING

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

systems. In case of doubt contact the Heatrae Sadia Service Department (see Back page).

Diagram 16 - Exploded view of the Cold Water Combination Valve and Expansion

Core Unit

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Summary of Contents for Megaflo solar

Page 1: ...Megaflo HE 1 1 tech 36 00 5823 Issue 4 Fitting and using the Megaflo Solar unvented mains pressure water heater Solar 36005942issue5 ...

Page 2: ... 32 12 GUARANTEE 35 13 CONTACTS 36 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 ...

Page 3: ...ing Regulation Part L The Megaflo Solar 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 the necessary inlet and safety controls electric immer sion heater s and for units fitted with an auxiliary heating coil a cylinder thermostat thermal cut out 2 port motorised va...

Page 4: ...ted Temperature Pressure Relief Valve set at 90o C 10bar T P Relief Valve Insulation Set Drain Valve Wiring Centre CL units only Tundish included in the Cold Water Combination Valve pack Factory fitted Auxiliary heating coil Thermostat and Thermal Cut out CL units only 2 port Motorised Valve Indirect units only Lifting handle 2 2 SITING THE MEGAFLO SOLAR see Diagram 1 The Megaflo Solar unit must b...

Page 5: ... the Cold Water Combination Valve see Diagrams 4 and 5 Branches to cold drinking outlets should be taken before the valve Outlets situated higher than the Megaflo Solar 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 NOTE Accessories should have a rated operating pressure of at least 0 8 M...

Page 6: ...rates a factory set non adjustable Pressure Reducer Strainer an Expansion Valve connection and a single Check Valve The valve can be fitted in any orientation to suit the in stallation however ensure that the Valve is installed with the direction of flow arrows stamped on the side of the brass body pointing towards the Megaflo Solar heater Should you wish to site the Expansion Valve on the Cold Wa...

Page 7: ...n 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 Ensure the discharge from the Expansion Valve can be correctly installed Diagram 2 Cold Water Combination Valve Diagram 3 Expansion Core Unit ...

Page 8: ...Off Cock Temperature Pressure Relief Valve Balanced cold water draw off Balanced HWS and MCWS to bathrooms showers cloakrooms etc Isolating Regulating Valves as required HWS supply Expansion Core Unit combined Expansion Relief Valve Check Valve SC SC DOC EXPANSION VESSEL Incoming Cold Water Main MCWS to Kitchen unbalanced cold mains supply Cold Water Combination Valve incorporating Pressure Reduci...

Page 9: ... Balanced cold water draw off to shower mixer valves Note tapping must be min 3m from Megaflo inlet connection Balanced HWS and MCWS to each shower Isolating Regulating Valves as required HWS supply SC SC DOC Incoming Cold Water Main Incoming Cold Water Main MCWS to Kitchen and drinking water outlets unbalanced cold mains supply Cold Water Combination Valve incorporating Pressure Reducing Valve Is...

Page 10: ...essary this can be done using a normal car foot pump It is recommended that the Expansion Vessel is adequately supported An Expansion Vessel wall mounting bracket is supplied for this purpose NOTE DO NOT USE THE POTABLE WATER EXPANSION VESSEL SUPPLIED WITH THE MEGAFLO SOLAR FOR ANY OTHER PURPOSE IT MUST NOT BE USED IN PLACE OF THE SOLAR PRIMARY SYSTEM EXPANSION VESSEL 3 8 SECONDARY CIRCULATION If ...

Page 11: ...perature Pressure Relief Valve be removed other than by Authorised Heatrae Sadia personnel To do so will invalidate any guarantee or claim ii The Cold Water Combination Valve must be fitted to the mains water supply to the Megaflo Solar 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 ...

Page 12: ...pe s D1 from the safety device s In either case the tundish should be vertical located in the same space as the unvented hot water storage system and be fitted as close as possible and within 500mm of the safety device e g the temperature relief valve The discharge pipe D2 from the tundish should terminate in a safe place where there is no risk to persons in the vicinity of the discharge preferabl...

Page 13: ...ipe D2 to be connected If unvented hot water storage systems are installed where discharges from safety devices may not be apparent i e in dwellings occupied by blind infirm or disabled people consideration should be given to the installation of an electronically operated device to warn when discharge takes place Note The discharge will consist of scalding water and steam Asphalt roofing felt and ...

Page 14: ... 22mm 28mm 35mm up to 9m up to 18m up to 27m 0 8m 1 0m 1 4m G3 4 22mm 28mm 35mm 42mm up to 9m up to 18m up to 27m 1 0m 1 4m 1 7m G1 28mm 35mm 42mm 54mm up to 9m up to 18m up to 27m 1 4m 1 7m 2 3m Fixed grating Discharge below fixed grating Building Regulation G3 section 3 9d gives alternative points of discharge Trapped gully Discharge pipe D2 from tundish with continuous fall See Building Regulat...

Page 15: ... provided on the Megaflo Solar see diagram 9 and its cable secured using the cable clamp supplied The solar controller and solar primary circulation pump must be wired via the over temperature cut out mounted in the lower solar controls housing see diagram 9 This will ensure that the heat input to the solar coil is interrupted in the event of the cylinder over heating There must also be suitable C...

Page 16: ...ing with the key spanner provided If an additional immersion heater is required order Part No 95 606 964 5 2 WIRING see Diagram 10 All electrical wiring should be carried out by a competent electrician and be in accordance with the latest I E E Wiring Regulations Each circuit must be protected by a suitable fuse and double pole isolating switch with a contact separation of at least 3mm in both pol...

Page 17: ...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 Schematic wiring diagram Direct immersion heaters THERMOSTAT FUSED 13A DOUBLE POLE ISOLATING SWITCH Diagram 11 Immersion heater details 1 5mm2 3 CORE HOFR SHEATHED CABLE EARTH CONNECTION ...

Page 18: ...to prevent the Megaflo Solar from overheating the 2 port motorised valve supplied MUST be fitted to the primary flow to the auxiliary heating coil see Diagram 12 6 3 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 Solar Indirect Thermostat and Thermal Cut out are factory pre wired The 2 port mot...

Page 19: ...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 Refer to Sections 5 2 and 5 3 and Diagram 10 and 11 for details of wiring and operation of the immersion heater Diagram 12 Primary connections to indirect CL units TO HOT ...

Page 20: ...MOSTAT THERMOSTAT ADJUSTMENT INDIRECT THERMAL CUT OUT INDIRECT THERMAL CUT OUT RESET BUTTON NOTE THE HOUSING COVER AND ELEMENT ASSEMBLY HAVE BEEN REMOVED FROM THIS VIEW FOR CLARITY Diagram 13 Indirect controls housing details Installation Indirect units ...

Page 21: ...Megaflo HE 21 Diagram 14 2 x 2 port valve system ...

Page 22: ...22 22 tech Installation Indirect units Diagram 15 2 port valve in conjunction with a 3 port mid position valve system ...

Page 23: ...r the Expansion Valve situated on the Cold Water Combination Valve or Expansion Core Unit see Diagrams 2 and 3 7 3 SOLAR PRIMARY CIRCUIT Fill the solar primary circuit following the instructions provided with the solar hydraulic controls The cylinder temperature control sensor probe supplied with the solar differential temperature controller must be inserted into the pocket in the lower controls h...

Page 24: ... located on the front of the thermostat mounting bracket see Diagram 13 and rotating The minimum thermostat setting is 10o C The adjustment range 1 to 5 represents a temperature range of 30o to 70o C Check that no water is discharged from either the Expansion Valve or Temperature and Pres sure Relief Valve during the heating cycle 7 6 BENCHMARKTM LOG BOOK On completion of the installation and comm...

Page 25: ...ges to the operating temperature differential set points can affect the efficiency of the operation of the solar heating circuit it is recommended that any changes made are carried out by a competent solar water heating installation engineer IMMERSION HEATERS A combined thermostat and thermal cut out is provided for each immersion heater The thermostat is factory set to give a water storage temper...

Page 26: ... cloudiness may be noticed in the hot water This is due to aeration of the water is quite normal and will quickly clear 8 4 OPERATIONAL FAULTS Operational faults and their possible causes are detailed in Section 10 3 Table 2 It is recom mended that faults should be checked by a competent installer The air volume within the expansion vessel will periodically require re charging to ensure expanded w...

Page 27: ...RAINER The strainer is incorporated within the Pressure Reducing Valve housing of the Cold Water Combination Valve see Diagram 2 To inspect and clean the strainer i Turn off the isolating valve on the Cold Water Combination Valve by turning the black handle so it lies 90o to the direction of flow ii Open the lowest hot tap in the system to relieve the system pressure iii Using a spanner unscrew th...

Page 28: ...backnut is tightened Replace the thermostat s by carefully plugging the two male spade terminations on the underside of the thermostat head into the corresponding terminations on the element Rewire the immersion heater s in accordance with Diagram 10 Close and secure terminal cover s 9 6 EXPANSION VESSEL CHARGE PRESSURE Remove the dust cap from the top of the expansion vessel Check the charge pres...

Page 29: ...822 Immersion heater backnut 95 607 869 Immersion heater key 95 607 861 Solar temperature probe pocket plate 95 607 064 Tundish 95 605 838 Expansion relief valve cartridge 8bar 95 605 870 Expansion Valve complete 95 607 028 Cold water combination valve body incl isolating valve 95 605 029 Check valve housing 95 605 028 Pressure reducing valve cartridge 3bar 95 605 026 Pressure reducing valve housi...

Page 30: ...ssible 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 systems In case of doubt contact the Heatrae Sadia Service Department see Back page Diagram 16 Exploded view of the Cold Water Combination Valve and Expansion Core Unit ...

Page 31: ...ris ed valve s ee Diagram s 14 15 7 S O LA R ins uffic ient s olar gain with no aux iliary heating s witc hed on 7 Chec k aux iliary heat s ourc e is s witc hed on and is c ontrolled to provide heat gain if no s olar output is available W ater dis c harges from E x pans ion Relief V alve E x pans ion volum e has reduc ed within E x pans ion V es s el 1 S ee S ec tion 9 6 for re c harging proc edur...

Page 32: ... SOLAR PRIMARY FLOW 3 T P VALVE 4 BOOST IMMERSION HEATER 5 AUXILLARY IMMERSION HEATER 6 INLET 7 SOLAR CONTROL HOUSING Ø 594 550 45 8 1 370 433 412 29 A B C D E 7 8 2 1 3 4 5 9 6 F 20 25 30 1 SOLAR PRIMARY RETURN 2 SOLAR PRIMARY FLOW 3 AUXILLARY BOILER RETURN 4 AUXILLARY BOILER FLOW 5 T P VALVE 6 SECONDARY RETURN 7 AUXILLARY CONTROL HOUSING 8 INLET 9 SOLAR CONTROL HOUSING Ø 594 550 45 8 1 ...

Page 33: ...3kW UPPER LOWER 6kW UPPER BOOST 3kW HEAT UP TIMES mins UNIT WEIGHT kg SIZE EMPTY FULL AUXILLARY VOLUME L AUXILLARY COIL SPECIFICATIONS SURFACE sqm HEAT UP mins RECOVERY mins RATING kW 170 210 260 300 37 8 42 5 47 3 61 5 207 8 252 5 307 3 361 5 N A 60 60 60 N A 75 89 110 126 150 178 220 120 140 170 200 190 210 250 300 45 5 47 5 56 5 66 5 235 5 257 5 306 5 366 5 120 120 145 175 0 61 0 68 0 73 0 79 2...

Page 34: ...lation CFC HCFC free fire retardant expanded polyurethane foam with zero ozone depletion potential It has a Global Warming Potential GWP of 3 1 Nominal thickness 50mm Pipe connections All connections accept 22mm outside diameter pipe compression nuts and olives supplied Thread rate is 3 4 BSP male parallel to accept standard 3 4 BSP female fittings if required Safety features Direct units Manually...

Page 35: ...ter v It has not been installed in a location liable to be subjected to frost nor has it been tampered with or been subjected to misuse or neglect vi No factory fitted parts have been removed for unauthorised repair or replacement vii Within 60 days of purchase the user completes and returns the certificate supplied to register the product Evidence of purchase and date of supply must be submitted ...

Page 36: ...Business Park Bentley Wood Way Burnley Lancashire BB11 5ST Tel 01282 834403 www partscenter co uk Newey Eyre Specialist Products Division Please contact your local branch UK Spares Ltd Tower Lane Warmley Bristol BS30 8XT Tel 0117 961 6670 William Wilson Ltd Unit 3A 780 South Street Whiteinch Glasgow G14 0SY Tel 0141 434 1530 CUSTOMER SERVICE Tel 0844 8711535 Fax 0844 8711528 E mail heatraesadiaser...

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