5.8 Connection of
Secondary Return
For cylinders that do not have a
dedicated secondary return
connection, it is possible to install a
secondary return by connecting a
swept - T to the cold water inlet of the
cylinder (see Figure 10).
The secondary return pipe should
incorporate a check valve and a WRAS
approved circulation pump; timer and
thermostat to be provided separately.
Where secondary return circuits are
used, then an additional expansion
vessel may be required.
The secondary return loop must avoid:
- stagnant water in long pipe runs
- long waiting times at draw off point
for hot water
- undue water wastage
To minimise the energy consumption of
the secondary return circuit and to
ensure reliable operation it is important
to consider:
- the control of the circulation pump to
be time and temperature controlled
- the secondary return circuit pipe
work to be insulated
- the secondary return pump to be of
suitable material and specification
Figure 10: Secondary return loop
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