System Details - Benchmark PulsaCoil A-Class 145 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
A-CLASS
shown below. PulsaCoil
high as 5 bar although the recommended range is 2-3 bar dynamic at the appliance.
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.
If you encounter a situation where the water pressure is adequate but flow rates are
poor please contact our technical helpline for details of an effective solution.
Note :Each Pulsacoil A-CLASS 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
A-CLASS
the PulsaCoil .
Every PulsaCoil is designed to cope with most hard water situations up to 250ppm.For
EXTREME situations where the hardness is above 250ppm, specify the Gledhill scale
inhibitor which is available as an optional extra.
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will operate at mains pressures as low as 1 bar and as
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The hot water flow rate from the PulsaCoil
A-CLASS
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 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 60ltr/min in some properties.
Note: The diagram below showstheTopup cistern
with ballvalve and warning/overflow pipe
which can be supplied as an optional extra
if required. However, the standard preferred
arrangement is for the cistern to be manually
filled from a temporary hose connection fitted
with a double check valve.
The cistern must not be fitted more than
10metres above the PulsaCoil A-Class appliance
itself.
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Page 9
1.0 DESIGN
is directly related to the adequacy of the
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