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To meet the requirements of Building Regulations for a boiler interlock it is
recommended that the radiator in the area where the room thermostat is installed
should be fitted with lock shield valves on both connections.
(f) Plastic pipework: All the recommendations with regard to pipework systems in this
manual are generally based on use of BS/EN Standard copper pipework and fittings.
However plastic pipework can be used in place of copper internally as long as it
is recommended by the manufacturer and installed fully in accordance with their
recommendations. We always recommend the barrier plastic pipework for these
systems.
it is important that if the system is to be installed using plastic pipework then ensure
that it is designed and sized for plastic pipework. This is particularly important in
relation to use of push fit connections when using the optional flexible hose kits
(See installation and Wiring section of this document).
(g) F & E cistern: The cistern can be fitted up to 10m above the base of the appliance i.e.
the maximum static pressure in the appliance must not exceed 1.0 bar. The water
level in the F & E cistern should be at least 250mm above the highest point of the
circuit from the mCHP unit.
(h) Overflow pipe: The overflow/warning pipe should be in 20mm internal diameter
pipe of suitable material for use in heating systems in accordance with BS 5449
(such as copper). it should have continuous fall and discharge in a conspicuous
external position. it should not have any other pipework directly branched into
it.
(i) Cold feed and open vent: The BoilerMate thermal store acts as the neutral point
of the system. The open vent (22mm copper) and the cold feed/expansion pipe
(15mm copper) are provided in the F & E cistern as an assembly and should be
installed in accordance with instructions provided.
HEATING AND HOT WATER 4.0
4.3
mCHP CIRCUIT DESIGN
When designing the hydraulic circuit between
the mCHP unit and the BoilerMate, as well as
this manual, the mCHP unit manufacturers
instruc tions should be followed. The
characteristics of the pumps fitted to the
BoilerMate are given in figures 3.4 and 3.5.
The BoilerMate thermal store acts as the neutral
point of the system and therefore this circuit
should be designed bearing in mind that the
open vent and cold feed/expansion pipes are
taken from the BoilerMate.
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