Technical data

INSTALLATION & SERVICING INSTRUCTIONS
The cylinder should 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 must not be used on a sealed system.
Filling and Make-up
There must be no permanent or temporary connection to the mains water supply, or to a water storage
cistern supplying domestic water, even through a non-return valve layout, without the approval of the
local Water Authority. If the system is to be filled from the mains via a temporary hose, the filling point
will require a non-return valve and
anti-vacuum valve on the mains side of the fill point stop valve, both valves UK Water Fittings Byelaws
Scheme Listed.
Provision should be made for replacing water lost from the system, from a make-up vessel mounted in
position higher than the top point of the system and connected through a non-return valve to the return
side of either the hot water cylinder or heating circuit. Alternatively, where access to a make-up vessel
would be difficult, provision for make-up can be made by pre-pressurisation of the system.
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