gledhill BM125 Installation And Servicing Instructions page 4

Mains cold
water
Remote
F&E tank
Open Vent
Primary flow
BM
2000
Primary
return
Boiler
Full bore automatic bypass valve NOT REQUIRED
unless the heating system incorporates
mechanical thermostatic control valves e.g.
T.R.V's to all radiators or 2 port zone valves.
1.1 INTRODUCTION
Description
The BoilerMate 2000 shown schematically above is designed to provide improved space
heating and mains pressure hot water when coupled to any remotely sited condensing
or non condensing boiler - as long as they comply with the recommendations
contained in the rest of this manual.
A report by the Cranfi eld Institute of Technology found that this system gives a
potential for energy savings of up to 15%.
Because of the effi ciency of the appliance improved SAP ratings can be achieved.
Further details are available from the Gledhill Technical Department.
The principle of a BoilerMate 2000 is to separate the heat generator e.g. a boiler
from heat emitters (radiators) by a thermal store, which evens out the fl uctuating
demands for heating and hot water. Thus, by storing energy produced when the
demand is low and discharging it when the demand is high (i.e. during property
warm up or when hot water is drawn off ), a smaller boiler can potentially be used.
An important feature of this concept is that hot water can be supplied directly from
the mains at conventional fl ow 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 a printed circuit board, which controls the speed of
the pump circulating the primary water from the store through the plate heat
exchanger.
To comply with the Benchmark Guidance Note for Water Treatment in heating and
hot water systems the installer should check the hardness levels 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.
Warning/overflow
pipe
Cold feed
1.0 DESIGN
If scale should ever become a problem the plate
heat exchanger is easily isolated and quickly
replaced with a service exchange unit which
can be obtained at a nominal cost from Gledhill.
For further details see Section 1 Hot and Cold
Water System page 10.
The pcb also incorporates the facility to operate
the heating pump for a few seconds every few
days when the heating is not being used, to
reduce the likelihood of the pumps sticking
as well as providing a boiler pump overrun
facility.
Any automatic boiler designed to operate on an
0 0
82 C fl ow and a 71 C return up to a maximum
of 35kW can be linked to any suitable model of
BoilerMate 2000 and the deciding factor is the
space heating and the hot water requirements
of a dwelling. See Section 1.2 Technical Data for
further details.
The BoilerMate 2000 is available with the
option of 'Switch' which will provide a 9kW
electrical emergency backup in case of failure
of the main heat source. See section 1.3 System
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