System Details - gledhill BM125 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 fi tted in the system a pressure
limiting (reducing) valve set to 3 bar will be required.
If you encounter a situation where the water pressure is adequate but fl ow rates are
poor please contact our technical helpline for details of an effective solution.
Note: Each BoilerMate 2000 is fi tted with a strainer and fl ow 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 fl ow
regulators the fl ow regulator on the cold inlet should be removed.
No check valve or similar device should be fi tted on the cold water supply branch
to the BoilerMate 2000.
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 fi t an in-line scale inhibitor/reducer to provide protection to the
whole of the domestic water system. See Appendix C for a copy of the relevant part
of the Benchmark Guidance Note.
1.0 DESIGN
When specifying this appliance we would
recommend that for hardness levels above
200ppm (mg/l) a hard water appliance is used.
For hardness levels above 250ppm (mg/l) we
would recommend that some form of in-line
scale inhibitor/reducer is recommended by one
of the Water Treatment companies listed in the
Benchmark Guidance Note (see Appendix C)."
The hot water fl ow 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 for those services,
which could be required to be supplied
simultaneously, and this maximum demand
should be calculated using procedures defi ned
in BS 6700.
If a water meter is fi tted 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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