Bivalent System - Dimplex ECS150HP40A-580 Installation And User Instructions Manual

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 11).
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
HW Outlet
Figure 11: Secondary return loop
Installation
To Taps
Swept-T
From Taps