Benchmark PulsaCoil 2000 Series Design, Installation And Servicing Instructions page 4

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1.1 INTRODUCTION
Description
The PulsaCoil 2000 shown schematically above is designed to provide an improved
method of supplying mains pressure hot water when used with a suitable off peak
electric supply/tariff.
The PC 125 model is only provided with one off peak immersion heater and it is only
recommended for use when an Economy 10 or Heatwise tariff is available - see model
selection guide on page 5 for details.
Because of the efficiency of the appliance improved SAP ratings can be achieved. Further
details are available from the Gledhill Technical Department.
An important feature of the concept is that hot water can be supplied directly from the
mains at conventional flow rates without the need for temperature and pressure relief
safety valves or expansion vessels. This is achieved by passing the mains water through a
plate heat exchanger. The outlet temperature of the domestic hot water is maintained by
the Pump Speed Control (P.S.C.) board, which controls the speed of the pump circulating
the primary water from the store through the plate heat exchanger.
The PSC incorporates the facility to automatically run the D.H.W.primary pump for about
3 seconds every 30 hours to help prevent it sticking.
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1.0 DESIGN
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Because of the innovative method of hot
water production no in-line scale reducer
is normally required on the cold supply to
the appliance.
If scale should become a problem the
plate heat exchanger is easily isolated and
replaced with a service exchange unit.
* Note: The standard appliance is
supplied as a manual fill model i.e.
without a ballvalve and overflow which
makes it particularly suitable for use
in flats/apartments. A ballvalve and
overflow fitting can be supplied as an
optional extra if required.
Page 4
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