gledhill benchmark BoilerMate A-Class OV Series Design, Installation And Servicing Instructions page 13

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1.0 DESIGN
1.3 SYSTEM DETAILS
Heating System
General
A schematic layout of the heating system in a
typical small dwelling is shown opposite.
The flow and return from the boiler must
always run directly to the BoilerMate A-Class
and the flow should rise continuously to
facilitate venting. The heating circuit is taken
from the BoilerMate A-Class and is piped in the
conventional manner.
The BoilerMate A-Class is only suitable for an
open vented system.
The F & E cistern can be fitted remotely up to
10m above the base of the BoilerMate A-Class
i.e. the maximum static pressure in the store
must not exceed 1 bar.
If any radiators are located above the level
of the BoilerMate A-Class the system should
be designed so that gravity circulation does
not occur when the heating pump is not
running. To be certain of preventing this it is
recommended that a check valve,or valves,are
fitted on the vertical flow pipes.
The water level in the F & E cistern should be
at least 250mm above the highest point on
the system including the radiators and must
be high enough to provide the minimum
head required by the boiler being used.
The boiler manufacturer's instructions with
regard to minimum head must always be
followed. This is particularly important in
situations where the headroom is restricted
(e.g. in a flat).
Range rated boilers can be used but should
always be set at the highest output. The
system efficiency will not be impaired while
the recovery rate will be improved.
It is not necessary to provide a boiler bypass on
the primary circuit (i.e. between the boiler and
the thermal store.)
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