Heatrae Sadia Megaflo Eco Solar Series, Product Manual

Page: 38 / 40

Unvented Hot Water Cylinder
38
IMPORTANT LEGAL REQUIREMENT FOR INSTALLERS
MEGAFLO Eco Solar, a trading name of Heatrae Sadia, 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 SOLAR 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 SOLAR SYSTEM, IF A FAULT IS
SUSPECTED CONTACT A COMPETENT INSTALLER.
SOLAR PRIMARY CIRCUIT
Temperature control when heating by the solar primary circuit will be controlled by the external solar differential temperature
controller. The controller should be set to give a water storage temperature of approx. 60
o C, however it can be set to other
temperatures. This will usually have been done during installation. A maximum of 70 o C is recommended to avoid nuisance
operation of the thermal cut-outs fitted to the unit. Adjustment is made at the solar differential temperature controller, refer to the
manufacturer’s instructions for details of how to make any adjustments.
Changes 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 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
(CL models) are fitted with an Indirect Thermostat which controls a 2-port motorised valve and hence the temperature
of the water in the MEGAFLO
Eco
Solar 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 expansion vessel will periodically require re-charging to ensure expanded water is accommodated within
the hot water system. A discharge of water INTERMITTENTLY from the Expansion Valve will indicate the air volume in the Expansion
Vessel has reduced to a point where it can no longer accommodate the water expansion.
If after following the above actions water still discharges from the Expansion Relief Valve further advice should be sought from a
competent installer or the BAXI CUSTOMER SUPPORT on Tel: 0844 871 1535.
USER GUIDE (4)