36
IMPORTANT LEGAL REQUIREMENT FOR INSTALLERS
MEGAFLO Eco, is a trading name of Heatrae Sadia, is a licensed member of the Benchmark
TM
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. is managed and promoted by the Heating
and Hotwater Industry Council. For more information visit www.centralheating.co.uk. Please ensure that the installer
has fully completed the checklist on page 34 of this manual and that you have signed it to say that you have received
a full and clear explanation of its operation. The installer is legally required to complete a commissioning checklist
as a means of complying with the appropriate Building Regulations (England and Wales). All installations must be
notified to Local Area Building Control either directly or through a Competent Persons Scheme. A Building Regulations
Compliance Certificate will then be issued to the customer who should, on receipt, write the notification number on
the checklist. This product should be serviced regularly to optimise its safety, efficiency and performance. The service
engineer should complete the relevant service record on the checklist after each service. The checklist may be required
in the event of any warranty work.
User Instructions
Warnings
IF WATER DISCHARGES FROM THE TEMPERATURE and PRESSURE RELIEF VALVE ON THE MEGAFLO Eco UNIT REFER TO
PAGE 29 (TABLE 6) FIRST FOR GUIDANCE. IF THIS DOES NOT RECTIFY THE FAULT SWITCH OFF ELECTRICAL SUPPLY TO
THE IMMERSION HEATER(S) [ DIRECT UNITS ] OR SHUT DOWN THE BOILER [ INDIRECT UNITS ]. DO NOT TURN OFF THE
WATER SUPPLY. CONTACT A COMPETENT INSTALLER FOR UNVENTED WATER HEATERS TO CHECK THE SYSTEM.
DO NOT TAMPER WITH ANY OF THE SAFETY VALVES FITTED TO THE MEGAFLO Eco SYSTEM, IF A FAULT IS SUSPECTED
CONTACT A COMPETENT INSTALLER.
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 temperature of approx. 60ºC, however it can be set to control between 12ºC and 68ºC. This will usually have been done
during installation. Adjustments can only be made by opening the terminal cover(s), DO NOT remove the cover(s) without first
switching off the electrical supply. The temperature adjustment is made by inserting a flat bladed screwdriver in the slot in the
disc on top of the thermostat and rotating (see Figure 16, p. 23).
If in any doubt consult a competent electrician.
Indirect units are fitted with an indirect thermostat which controls a 2-port motorised valve and hence the temperature of the water
in the MEGAFLO Eco unit. The thermostat is factory set to give a water storage temperature of approx. 60ºC, however it can be set
to control between 12ºC and 68ºC, this will usually have been done during installation. Adjustments can only be made by opening
the 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 Figure 16, p. 23 ) and rotating. At the minimum position the temperature will be approx. 12ºC.
If in any doubt consult a competent electrician.
Flow Performance
When initially opening hot outlets a small surge in flow may be noticed as pressures stabilise. This is quite normal with unvented
systems and does not indicate a fault. In some areas a cloudiness may be noticed in the hot water. This is due to aeration of the
water, is quite normal and will quickly clear.
Operational Faults
Operational faults and their possible causes are detailed in Table 6, p.29 . It is recommended that faults should be checked by a
competent installer.
The air volume within the MEGAFLO Eco unit will periodically require recharging to ensure any expanded water is accommodated
within the unit. A discharge of water INTERMITTENTLY from the Pressure Relief Valve will indicate the air volume has reduced to a
point where it can no longer accommodate the expansion. To recharge the air volume:-
i) 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. Turn the blue handle so that it lies at 90º to the direction of flow
(see Fig 6, p.13 for options on valve set) .
iii) Open the lowest hot tap supplied by the MEGAFLO Eco.
iv) Hold open the Temperature and Pressure Relief Valve until water ceases to run from the tap and gurgling noise at the valve stops.
v) Close Temperature and Pressure Relief Valve.
vi) Turn on the isolating valve at the Cold Water Combination Valve by turning the blue handle so it lies parallel to the direction of
flow, when water flows from the hot tap, close tap.
vii) The air volume will be automatically recharged as the unit refills. If after following the above actions water still discharges from
the Pressure Relief Valve, further advice should be sought from a competent installer or the MEGAFLO Eco Service Division.
Alternatively you can watch a video clip on how to replenish the air gap on:
http://www.heateam.co.uk/replenishing-the-air-gap-on-a-megaflo-cylinder.htm
USER GUIDE (4)
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