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3.6 SECONDARY CIRCULATION
A 3/4" BSP female threaded boss is provided (supplied blanked with a 3/4" BSP plug and sealing
washer) for the connection of a secondary circulation return pipe. Alternatively, if it is a requirement
that the whole cylinder contents be circulated the secondary return can be teed into the cold feed
pipe via a swept tee joint (available as an accessory, order code no. 95 605 812).
A suitable WRAS approved bronze circulation pump and check valve to prevent backflow should
be installed in the secondary return pipework.
Secondary circulation is not recommended for direct electric units.
Diagram 2 - Secondary circulation connection to cold feed pipe
COLD INLET
CONNECTION
COLD
SUPPLY
SWEPT
TEE
CHECK
VALVE
SECONDARY
RETURN
SECONDARY
CIRCULATION
PUMP
7
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