gledhill BM125 Installation And Servicing Instructions page 12

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.
Warning/overflow
pipe
Cold feed
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 2000
and the flow should rise continuously to
facilitate venting. The heating circuit is taken
from the BoilerMate 2000 and is piped in the
conventional manner.
The BoilerMate 2000 is only suitable for an
open vented system.
The F & E cistern can be fi tted remotely up to
10m above the base of the BoilerMate 2000
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 2000 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
fi tted on the vertical fl ow 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 fl at).
Range rated boilers can be used but should
always be set at the highest output. The
system effi ciency will not be impaired while
the recovery rate will be improved.
It is not necessary to provide a boiler bypass
on the primary circuit with thermal storage
appliances (i.e. between the boiler and the
thermal store.)
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