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CLEANING INSTRUCTIONS: Clean outer
cladding of cylinder with a soft cloth
dampened with warm water only. Do
not use abrasive or aggressive cleaning
materials, such as alcohol or petroleum
based solvents, as this may damage the
surface of the product.
4.3 Cold Water Supply
For satisfactory and safe performance of the
unvented cylinder the water supply must meet
the following criteria:
Minimum dynamic
pressure
Maximum inlet supply
pressure
Minimum flow rate
Max. chlorine content
Max. water hardness
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.
Dimplex recommend an annual maintenance
inspection is carried out on the domestic hot
water cylinder. In hard water areas this should
include inspection of the heat exchanger and
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
water conditioner or water softener. These
devices should be installed in hard water areas
where high water storage temperatures are
required,
i.e.
greater
temperatures, particularly when water hardness
exceeds 200ppm. Should the water cylinder
require de-scaling, this must be performed by a
qualified technician.
150 kPa
(1.5 bar)
1200 kPa
(12 bar)
15 l/min
250mg/L
200mg/L
than
60°C
storage
Pre-Installation
4.4 Building Regulation G3 Discharge
Requirements
As
part
of
the
requirements
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
should
be
fitted
in
requirements of Building Regulation approved
document G3, (England and Wales), Part P of
Northern Ireland and Standard 4.9 of Scotland.
4.4.1 Discharge Pipe D2
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
withstanding temperatures of the water
discharged and is clearly and permanently
marked
to
identify
performance standard."
Dimplex strongly recommends the use of metal
pipework only and Dimplex does not take
responsibility for any damage caused from
discharges.
The discharge pipe d2 should be at least one pipe
size larger than the nominal outlet size of the
safety device unless its total equivalent hydraulic
resistance exceeds that of a straight pipe 9m
long, i.e. For discharge pipes between 9m and
18m the equivalent resistance length should be
at least two sizes larger than the nominal outlet
size of the safety device; between 18 and 27m
at least 3 sizes larger, and so on; bends must be
taken into account in calculating the flow
resistance. See Figure 2: Typical Discharge Pipe
ArrangementFigure 2, Table 2 and the worked
example.
Note: An alternative approach for sizing
discharge pipes would be to follow Annex D,
section D.2 of BS 6700:2006 + A1:2009).
of
Building
accordance
with
the
be
capable
of
safely
the
product
and
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