Strom SBSP7C - System Piping and Connections; Design Notes: Valves, Vents, and Drains

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STROM LIMITED 2020
12
SYSTEM PIPING
Electric Boilers
The boiler must be installed by a competent and certied plumber or heating engineer and systems should be
designed to meet the current building regulations in force at the time of installation.
Strom Limited are not responsible for faulty installations which are performed by unqualied tradespeople.
DESIGN NOTES:
ISOLATION VALVES:
For ease of removal from the system, it is recommended that full bore isolation valves are tted on the ow and
return pipework from the boiler. Do not use standard ball valves, as this can restrict the ow in and out of the
boiler and result in detrimental performance.
AUTOMATIC AIRVENTS
An automatic air vent is already built into the boiler. However, if the boiler is to be used in tandem with a hot
water cylinder, an additional air vent should be tted in the vicinity of the cylinder coil. An airvent should always
be considered at the highest point in a system to aid in purging the system of any air.
AUTOMATIC BYPASS VALVE
An automatic bypass valve is integral to any system and MUST be installed as part of this installation. The
ABV should be tted to begin opening as the rst valve, radiator, or actuator shuts in the system, this stops
excess pressure from building in the system on the ow side. Failure to t and set the ABV can result in poor
performance and premature boiler failure.
WATER CONNECTIONS
For lling the heating system, reference should be made to BS EN 14336. There must be no connection
between the central heating systems and the main water supply, and all local water bylaws must be
observed. Any connection made between the mains water and heating system must be disconnected
after use.
WATER PURGES
Install purges in the radiators and any high points in the heating system to aid in removing air.
DRAIN POINT
A drain point should be tted at the lowest point of the heating system. It is not acceptable to drain the boiler
through a safety valve as debris can prevent the correct operation of the valve.
HEATING EXPANSION VESSEL
An expansion vessel is tted internally within the boiler to provide room for thermal expansion of water under
regular operating conditions. However, if the system contains signicant volumes of water, an additional heating
expansion vessel should be tted externally.