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TheBoilerMateA-ClassOVshownschematicallyaboveisdesignedtoprovideimproved
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.
Because this product does not require a safety discharge from a temperature and
pressurereliefvalve,anyinstallationswill be easyto incorporateintothebuildingand
will not suffer from the problems associated with using PVCu soil stacks to take the
dischargefromunventedcylinders.
An important feature of this concept is that hot water can be supplied directly from
themainsatconventionalflowrateswithouttheneedfortemperatureandpressure
reliefsafetyvalves orexpansion vessels. Thisis achievedby passingthe mains water
throughaplateheatexchanger. Theoutlettemperatureofthedomestichotwateris
maintainedbyaprintedcircuitboard(A.C.B.),whichcontrolsthespeedofthepump
circulating the primary water from the store through the plate heat exchanger.
The Building Regulations L1A: New dwellings/L1B: Existing dwellings and the
requirementssetoutintheDomesticHeatingComplianceGuidespecifythat“where
the mains water hardness exceeds 200ppm provision should be made to treat the
feedwatertowaterheatersandthehotwatercircuitofcombinationboilerstoreduce
the rate of accumulation of lime scale”.
Tocomplywiththisrequirementthehardnessofthemainswatershouldbechecked
by the installer and if necessary the optional factory fitted electronic in-line scale
inhibitor should be specified at the time of order for hardness levels between 200
and 300 ppm (mg/l).
Wherethewaterisveryhardie300ppm(mg/l)andabovethe optionalpolyphosphate
type,inhibitorshould be specifiedatthe timeoforder. However,thiswill needtobe
1.0 DESIGN
Description
1.1 INTRODUCTION
2EMOTE
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&ULLBOREAUTOMATICBYPASSVALVE./42%15)2%$
UNLESSTHEHEATINGSYSTEMINCORPORATES
MECHANICALTHERMOSTATICCONTROLVALVESEG
426gSTOALLRADIATORSORPORTZONEVALVES
0RIMARYFLOW
0RIMARY
RETURN
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!#LASS
"OILER
7ARNINGOVERFLOW
PIPE
#OLDFEED
-AINSCOLD
WATER
/PEN6ENT
fitted by the installer at a suitable point in the
cold water supply to the appliance.
Ifscaleshouldeverbecomeaproblemtheplate
heat exchanger is easily isolated and quickly
replacedwithaserviceexchangeunitwhichcan
be obtained at a nominal cost from Gledhill.
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.
Anyautomaticboilerdesignedtooperateonan
820Cflowanda710Creturnuptoa maximum
of35kWcanbelinkedtoanysuitablemodelof
BoilerMateA-Classandthedecidingfactoristhe
spaceheatingandthe hotwaterrequirements
of a dwelling. See Section 1.2 Technical Data
for further details.
TheBoilerMateA-ClassOVissuppliedcomplete
with‘Switch’whichwillprovidea6kWelectrical
emergencybackupincaseoffailureofthemain
heatsource. Seesection1.3 SystemDetails for
further information.
Theheatlossesfromthermalstoresshouldnot
be directly compared with heat losses from
unventedorventedcylindersbecausetheyare
treated differently in SAP. The SAP calculator
takes account of the type of store and various
correction factors are included to reflect the
different ways that the hot water and heating
operates.
For further information please request a copy
of the SAP 2005 Data Sheet which provides
the information required to produce SAP
calculations for all Gledhill Thermal Storage
products.
Gledhillarepartofthe‘Benchmark’schemeand
a separate commissioning/service log book is
included with the product.
A15mmconnectionisprovidedontheprimary
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.
