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This manual is designed to be a quick guide to the most common type of installation for a Grant Aerona 3 R32
Monobloc system.
This assumes heating via Buffer Tank, Grant also offer a option of a Lossloss Header/Volumiser (which
has a volume of 11.5lt and includes a 3kw immersion heater to provide a supplementary heat),
domestic hot water via a cylinder with sensor pocket and immersion heater, using 2 x 2port valves to
control space heating and Hot water heating using the Grant Controller and third party controls for
the end user.
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In the above system the monobloc unit functions are controlled by the unit's own controller and this is
for use by the technician. End user controls by Third Party.
The end user controls the heating demand and the hot water via the third-party controller.
The heat pump controls the domestic hot water temperature itself (including for an optional
sterilization cycle) and is assisted by the immersion heater. 2 ports vales can be used as in a
conventional S plan heating setup or using a drive open 3 port valve in a Y plan heating configuration.
The hot water temperature is control managed through the Grant controller. Hot water takes priority
over heating. The EP001 Heat pump interface is used to take the wiring connections.
There is no electric heater inside the monobloc unit, however there is an additional booster heater available.
There is a flow sensor located within the unit.
A pump is installed within the Monobloc; however, a second pump will be required on downstream of the
buffer to feed the heating circuits.
A strainer must be installed in the return pipework to the mono block. It is strongly recommended by Grant in
addition to this, a Magnetic filter and Flow setter should also be installed. Grant recommends installation of
one of their Mag one in line filters which also incorporates a gauss filter.
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Highest point of
primary circuit
Centre of expansion vessel
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