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HP Installation and User Instructions R00918
-
1 03/11
Page 20
Installation
Figure 6: Secondary return loop
5.8 Connection of
Secondary Return
A secondary return port is installed on
the 210, 250 and 300L cylinders. 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.
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.
If the secondary return is not used it
should be blanked with a ½” bung.
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
To Taps
From Taps
HW Outlet
Secondary
Return
Swept
-
T
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