Technical data

INSTALLATION & SERVICING INSTRUCTIONS
Bypass
The flow through the boiler must not be allowed to fall below the figure shown in the
Technical Data
Section. Therefore a bypass of at least the diameter shown in the Technical Data Section, should be
fitted across the boiler. The total length of the bypass loop should be at least 3m. It is acceptable to
use a radiator that cannot be shut off or adjusted by the customer as the bypass.
The use of this bypass will mean the temperature differential across the boiler will be less than that
across the heating system.
External Controls
It should not be possible for the boiler to fire when external controls have shut all waterways or
switched off the pump.
Inhibitor
When an inhibitor is to be used in the system, contact should be made with the inhibitor manufacturer,
so they can recommend their most suitable product. The boiler has a copper heat exchanger.
Working Pressure
The maximum working pressure to which the boiler should be subjected is 3 bar (44 Ibf/in2). The
normal recommended range of pressure is from 0.1 bar (1.5 lbf/in2) to 1.5 bar (22 lbf/in2).
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5.2 Open Vented System Only
Schematic layouts are shown in
Figures 4 to 6 .
Hot Water Storage Cylinder
The cylinder must be either an indirect type or a direct type fitted with an immersion calorifier that is
suitable for the system pressure. The cylinder should be to the requirements of BS1566, Part 1, 1984.
Single feed (self priming) indirect cylinders are not recommended.
Open Vent and Cold Feed
A combined feed and vent is recommended, as there is no possibility of either pumping over or air
being drawn in. A system using a Myson Aerjec is equivalent to a combined feed and vent, with
improved air removal from system. The combined feed and vent must be at least 22mm diameter.
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