Heatrae Sadia MEGAflo Installation Manual page 5

immersion heaters and indirect controls should be possible for servicing and maintenance of
the system (Note: indirect controls housing hinges open to the left hand side).
Please do not install valves or pipework (except discharge pipe) within 50mm (2") of the
T&P relief valve to allow your insulation set to be fitted. The insulation set is important to
ensure heat and energy conservation. See section 3.8 for more information.
To aid installation the Megaflo is provided with lifting points located in the base moulding
and a lifting handle. The lifting handle should be fully threaded onto the outlet boss before
use. Once the Megaflo is suitably positioned the lifting handle should be removed to allow
connection of the outlet pipework. The weights of the units are noted on the tables on page
33.
2.3 WATER SUPPLY
Bear in mind that the mains water supply to the property will be supplying both the hot
and cold water requirements simultaneously. It is recommended that the maximum water
demand be assessed and the water supply checked to ensure this demand can be met.
NOTE: A high mains water pressure will not always guarantee high flow rates.
Wherever possible the main supply pipe should be in 22mm. The minimum mains water
supply requirements should be 0.15 MPa (1.5 bar) working pressure and 20 litres per min-
ute flowrate. At these values outlet flowrates may be poor if several outlets are used simulta-
neously, the higher the available pressure and flowrate the better the system performance
will be.
The Megaflo has an operating pressure of 3 bar which is controlled by the Cold Water Com-
bination Valve. The Cold Water Combination Valve can be connected to a maximum mains
supply pressure of 1.6 MPa (16 bar). The water supply must be of wholesome water quality
(Fluid Category 1 as defined by the Water Supply Regulations 1999).
2.4 OUTLET/TERMINAL FITTINGS (TAPS, ETC.)
The Megaflo can be used in conjunction with most types of terminal fittings. It is advanta-
geous in many mixer showers to have balanced hot and cold water supplies, in these
instances the balanced cold water supply should be teed off the supply to the Megaflo im-
mediately after the Cold Water Combination Valve (see Figures 4 and 5). Branches to cold
drinking outlets should be taken before the valve.
Outlets situated higher than the Megaflo 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 MPa (8 bar).
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