MEGAFLO 400L Product Manual - page 32
Unvented Hot Water Cylinder
32
IMPORTANT LEGAL REQUIREMENT FOR INSTALLERS
MEGAFLO Eco Plus, a trading name of Heatrae Sadia Heating, 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 / PRESSURE RELIEF VALVE ON THE MEGAFLO Eco Plus UNIT REFER TO PAGE 25 (TABLE
8) 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 Plus 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 10ºC and 70ºC. This will usually have been done during installation. Adjustments can only
be made by removing 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 arrow top of the thermostat and rotating (see Figure 13, page 19).
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 Plus unit. The thermostat is factory set to give a water storage temperature of approx. 60ºC, however it can be set to control between 10ºC and
70ºC, 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 rotating the knob on the indirect control unit (see
Figure 9, page 17 ) and rotating. At the minimum position the temperature will be approx. 10ºC.
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 8, page 25
.
It is recommended that faults should be checked by a competent installer.
The air volume within the expansion vessel will periodically require recharging to ensure expanded water is accommodated within the unit. A discharge of
water INTERMITTENTLY from the expansion valve will indicate the air volume has reduced to a point where it can no longer accommodate the expansion.