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Installation
A Class HP Installation a
nd User Instructions R02583
-6 09/15
Page
24
5.10 Bivalent System
Bivalent system operation can be achieved by
disconnecting the buffer cylinder live connection
[A] and connecting the backup heat source.
5.11 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 13).
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
Figure 13: Secondary return loop
HW Outlet
To Taps
Swept-T
From Taps
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