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ELECTRAMATE 2000 - 270/12KW
1.0 DESIGN
1.1 INTRODUCTION
TheElectraMate2000 has been designed to utilize the latest technologyto provide
mains pressure hot water and traditional wet central heating from conventional
radiators utilising off-peak electricity.
For optimumefficiencyit isimportantthat thebest off-peak tariff is available,anda
minimum of Economy 10 is recommended (see Model Selection Table below).
The ElectraMate 2000 is controlled by a microprocessor based PCB and operates
as follows.
Charging of the thermal stores
Theelectronicsensormonitorsthestoretemperatureandwhenthestoreisdepleted
the controller starts the recharge cycle giving priority to times when off-peak
electricity is available. When the controls are enabled to recharge the store,pump
and heaters are switched on and these continue to run until the store sensor is
satisfied i.e.fully charged.
The control system automatically selects the store charge temperature and control
thermostatdifferentialtomatchelectricitytariffs. Inthesummermonthsthereisno
requirementforspaceheatingthereforethebuiltin controlslowerthe storecharge
temperature to reduce the runnings costs.
Space Heating Operation
The operation of the space heating is
controlled by user controls. A programmable
room thermostat is provided loose for this
purpose. When there is a demand for
space heating from the programmable room
thermostat the ElectraMate 2000 control
system starts the space heating pump which
circulates the preheated hot water from the
storetotheradiators.Thespaceheatingpump
continues to run as long as the heat demand
signal is present from the user controls,other
than when hot water is being drawn.
Theself-acting3-portmixingvalvecontrolsthe
space heating flow temperature to increase
the utilisation of stored energy.
Domestic HotWater Operation
An important feature of this 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
throughaplateheatexchanger(PHE),whichis
heated instantaneously by the primary water
circulated by the dedicated pump through
the PHE.
The outlet temperature of the domestic
hot water is maintained at a pre-set level
(normally about 50 - 55°C at 18 litres/min) by
an electronic controller, which regulates the
speed of the pump circulating the primary
water from the store through the plate heat
exchanger.
TocomplywiththeBenchmarkGuidanceNote
forWaterTreatment in heating and hot water
systemstheinstallershouldcheckthehardness
levels of the water supply and if necessary fit
an in-line scale inhibitor/reducer to provide
protectiontothe whole of the domestic water
system.
Ifscaleshouldeverbecomeaproblemtheplate
heat exchanger is easily isolated and quickly
replaced with a service exchange unit which
canbeobtainedatanominalcostfromGledhill.
For further details see Section 1.3 Use in Hard
Water Areas.
The self-acting 3 port mixing valve controls
the flow temperature to the PHE at a pre-set
value. This not only limits the maximum flow
temperaturetothePHEbutitalsoincreasesthe
utilisation efficiency of the stored energy.
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