Specifications

Megaflo He
5
If you choose to install the PremierPlus SystemFit in the highest point in the property (e.g.
loft space), it is advisable to install an additional Automatic Air vent (AAV) (not supplied-
available as spare, part number 95 605 050) above the pump to enable air to be removed
from the system. The addition of the AAV is not required if siting the cylinder in a lower
position.
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 be checked to ensure
this demand can be satisfactorily met.
NOTE: A high mains water pressure will not always guarantee high ow
rates.
Wherever possible the main supply pipe should be in 22mm. We suggest that the mini-
mum supply requirements should be 1.5 bar pressure and 20 litres per minute owrate. At
these values outlet owrates may be poor if several outlets are used simultaneously, the
higher the available pressure and owrate the better the system performance will be.
The Premier Plus SystemFit has an operating pressure of 3.5 bar which is controlled by
the Cold Water Combination Valve. The Cold Water Combination Valve can be connected
to a maximum mains supply pressure of 16 bar. The water supply must be of wholesome
water quality (Fluid Category 1 as dened by the Water Supply Regulations 1999).
2.4 OUTLET/TERMINAL FITTINGS (TAPS, ETC.)
The Premier Plus SystemFitcan be used in conjunction with most types of terminal ttings,
plumbing ttings and pipework. However, the rated pressures of any ttings selected
should be checked for compatibility before installation.
NOTE: Accessories, plumbing ttings and pipework should have a rated
operating pressure of at least 6 bar.
Outlets situated higher than the Premier Plus SystemFitunit will give outlet pressures
lower than that at the heater, a 10m height difference will result in a 1 bar pressure reduc-
tion at the outlet tting.
2.5 LIMITATIONS
The Premier Plus SystemFit unvented water heater should not be used in any of the follow-
ing instances:
• Solid fuel boilers or any other boiler in which the energy input is not under effective
thermostatic control unless additional and appropriate safety measures are installed.
• Steam heating plant
• Ascending spray type bidets or any other Class 5 back syphonage risk requiring that
a Type AA, AB, AD or AG air gap be employed.
• Water supplies that have either inadequate pressure or where the supply may be
intermittent.
• Situations where it is not possible to safely pipe away any discharge from the safety
valves.
• Areas where the water consistently contains a high proportion of solids, eg. sus
pended matter that could block the strainer, unless adequate ltration can be
ensured.