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6
Pre-Installation
5.2 Siting Considerations
When choosing a suitable location for the cylinder
the following aspects should be considered:
- structural integrity
- access for installation, operation, maintenance
and replacement
- routing of discharge pipe work
- access to water mains supply, hot and cold
water distribution pipes
- access to suitable electricity supply
- location in relation to remaining system
components
- frost protection
The Quantum direct electric cylinders are
designedtobeoorstanding,verticallymounted,
indoors and in a frost free environment. The
cylindermaybelocatedonanyatandlevel
surface,provideditissufcientlyrobustto
support the weight of the cylinder when full of
water (please see technical data) and suitably
accessible for replacement/maintenance without
specialist tools or lifting equipment as this will
void the warranty conditions.
The position and orientation of the cylinder should
be such that easy access is provided for servicing
the controls. A minimum distance of 400mm in
front of the immersion is recommended, to allow
the replacement of the immersion heater should
the need arise. When installing the cylinder all
labels should be clearly visible and ensure that no
pipework hinders any work to be carried out on
the various cylinder components.
Particular care must be taken when placing the
cylinder in a garage or outbuilding. All exposed
pipe work must be correctly insulated to avoid
frost damage.
5.3 Cold Water Supply
For satisfactory and safe performance of the
unvented cylinder the water supply must meet the
following criteria:
Minimum dynamic
pressure
150 kPa (1.5 bar)
Maximum inlet
supply pressure
1200 kPa (12 bar)
Minimumowrate 15 l/min
Max. chlorine
content
250mg/L
Max. water hardness 200mg/L
The following instructions have to be followed
when installing the cold water mains supply to the
cylinder:
- The cold water supply to the cylinder must come
directly from the cold water mains after the
mains stop valve to the property.
- The cold water inlet pipe work should have at
least an inside diameter of 19mm and should
meet the requirements of the water regulations
for the supply of wholesome water.
We recommend an annual maintenance inspection
is carried out on the domestic hot water cylinder.
In hard water areas this should include inspec-
tion of the immersion heater, [above 120ppm
or 120mg/l]. A local water treatment company
should be able to offer free water quality testing.
The heating
elements may require periodic de-scaling. The
installer should do this as part of a maintenance
agreement.
If required, precautions can be taken to minimise
effects of water hardness, i.e. installation of a
water conditioner or water softener. These devic-
es should be installed in hard water areas where
high water storage temperatures are required, i.e.
greater than 60°C storage temperatures, par-
ticularly when water hardness exceeds 200ppm.
Should the water cylinder require de-scaling, this
mustbeperformedbyaqualiedtechnician.
5.4 Building Regulation G3 Discharge
Requirements
As part of the requirements of Building
Regulation G3 any discharge from an unvented
system should be conveyed to where it is visible,
but will not cause danger to persons in or about
the building. The tundish and the discharge pipes
shouldbettedinaccordancewiththe
requirements of Building Regulation approved
document G3, (England and Wales), Part P of
Northern Ireland and Standard 4.9 of Scotland.
5.4.1 Discharge Pipe D2
According to the Building Regulations the
discharge pipe (D2) from the Tundish should:
“have a vertical section of pipe at least 300mm
long below the tundish before any elbows or
bends in the pipework and be installed with a
continuous fall of at least 1 in 200 thereafter.”
The discharge pipe (D2) should be made of:
“metal; or other material that has been
demonstrated to be capable of safely withstanding
temperatures of the water discharged and is
clearly and permanently marked to identify the
product and performance standard”.
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