System Details - Benchmark Gledhill BoilerMate 2000 125 Design, Installation And Servicing Instructions

1.3 SYSTEM DETAILS

Hot and Cold Water System
General
A schematic layout of the hot and cold water services in a typical small dwelling
is shown below. BoilerMate 2000 will operate at mains pressures as low as 1 bar
and as high as 5 bar although the recommended range is 2-3 bar. If the manifolds
(available as an optional extra) are being used the inlet pressure to the manifold
must be a minimum of 2 bar. It is also important to check that all other equipment
and components in the hot and cold water system are capable of accepting the mains
pressure available to the property. If the mains pressure can rise above 5 bar or the
maximum working pressure of any item of equipment or component to be fitted in
the system a pressure limiting (reducing) valve set to 3 bar will be required.
Note: Each BoilerMate 2000 is fitted with a strainer and flow regulator on the cold
mains supply connection. If the supply pressure is less than 2 bar or if the manifolds
(available as an optional extra) are being used or if all taps are provided with flow
regulators the flow regulator on the cold inlet should be removed.
No check valve or similar device should be fitted on the cold water supply branch
to the BoilerMate 2000.
Because of the innovative method of hot water production no scale reducer is
required on the branch to the appliance. However, to comply with the Benchmark
Guidance Note for Water Treatment in Heating and Hot Water Systems the installer
should check the hardness level of the water supply and if necessary fit a scale reducer
to provide protection to the whole of the domestic water system.
The hot water flow rate from the BoilerMate 2000 is directly related to the adequacy
of the cold water supply to the dwelling. This must be capable of providing
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1.0 DESIGN
for those services, which could be required
to be supplied simultaneously, and this
maximum demand should be calculated using
procedures defined in BS 6700.
If a water meter is fitted in the service pipe,
it should have a nominal rating to match the
maximum hot and cold water peak demands
calculated in accordance with BS 6700. This
could be up to 80ltr/min in some properties.
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