WATER SUPPLY
AquaFlo is capable of delivering over 50 litres per minute when
connected to a suitable mains supply. The high quality inlet control
set with its 3 bar operating pressure has been designed to make the
most of what is available, however the performance of any unvented
system is only as good as the water supply.
In unvented systems both hot and cold services are supplied
simultaneously from the mains so the maximum possible on-site
water demand must be assessed and the water supply should be
tested to ensure it can meet these requirements. If necessary
consult the local water supplier regarding the likely pressure and
flow rate availability.
It is important that site pressure readings are taken under dynamic
flow conditions, high pressures under zero flow conditions are not
necessarily indicative of satisfactory performance. A minimum of 1.5
bar at 20 l/m flow should be available. Where mains inlet pressures
are likely to exceed 12 bar then an additional upstream pressure
reducing device should be fitted.
SITING THE UNIT
AquaFlo can be positioned more or less anywhere in the building
but it should be remembered that for every 1 meter that an outlet is
above the AquaFlo, the pressure will be reduced by 0.1 bar. If siting
outside the heated envelope of the dwelling such as in a garage or
outbuilding then frost protection should be provided and exposed
pipework should be insulated.
AquaFlo must be supported on a flat base capable of supporting
the weight of the cylinder when full. The minimum recommended
cupboard size is 650mm square.
It’s important that consideration is given to access for maintenance
of the valves. The immersion heaters are 375mm long and access
space should be provided for possible future replacement.
A minimum of 22mm supply pipe-work should ideally be provided
and existing ½” (15mm) cold mains pipe-work may need to be
upgraded. Hard water treatment should be considered in areas
where the calcium carbonate content is greater than 200ppm, if
required adjust cylinder temperature to below 60 degrees.
SCHEMATIC
* Do not fit shut off valve between Cylinder and Expansion Valve
Secondary Return
Boiler Flow
Boiler Return
Pump
Non Return
Valve
2 Port
Valve
Temperature
& Pressure
Relief Valve
Expansion
Relief Valve
Drain Via
Cold Inlet
Expansion Vessel
With Wall Bracket
Non
Return
Valve
Pressure
Reducing
Valve
Isolating
Valve
Cold Connection
Cold
Main
(26 pages)
(1 pages)
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