gledhill benchmark BoilerMate A-Class OV Series Design, Installation And Servicing Instructions page 4

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1.1 INTRODUCTION
Description
TheBoilerMate A-Class OV 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.
The principle of a BoilerMate A-Class is to separate the heat generator e.g. a boiler
from heat emitters (radiators) by a thermal store, which evens out the fluctuating
demands for heating and hot water.
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
through a plate heat exchanger. The outlet temperature of the domestic hot water is
maintained by a printed circuit board (A.C.B.), 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 fit an in-line scale inhibitor/reducer to provide protection to the
whole of the domestic water system.
We recommend the use of the optional scale inhibitor to help protect the appliance
itself if the hardness level is above 280 ppm (mg/l).
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.
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1.0 DESIGN
The A.C.B. 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
82 C flow and a 71 C return up to a maximum
0 0
of 35kW can be linked to any suitable model of
BoilerMate A-Class 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 A-Class OV is supplied complete
with'Switch'which will provide a 6kW electrical
emergency backup in case of failure of the main
heat source. See section 1.3 System Details for
further information.
Gledhill are part of the'Benchmark'scheme and
a separate commissioning/service log book is
included with the product.
A 15mm connection is provided on the primary
return on all units to allow for the provision
of a pumped summer use towel rail circuit if
required (see page 16 for further details)
Note
The BoilerMate OV is a SYSTEM appliance
and only requires a basic boiler. If a system
boiler is chosen this will present wiring/
operational difficulties as well as incurring
extra costs.
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