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Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
Page 15 of 28
ST0109 – C 05/09
WATER
The wiring schematic for the solar loop is detailed in chapter 5.12. Please note: the so-
lar loop does not require a motorised two port valve as long as:
- the Dimplex SOLPU1/2 pump unit is being used (non return valves in flow and return)
- the cylinder is located lower than the solar panels
- all other connection requirements in this manual are being adhered to
To conform with building regulations it is imperative that the solar circulation pump is
installed in the solar loop through the twin thermostat and not directly from the solar
control unit.
The port connections for the solar flow and return connections are identified in Figure 2
for the SCxn…sd and the SCxn…si range.
Should the flow connection be the highest point in the solar loop an adequate device for
de-aeration has to be installed should the system not be commissioned using a flush a
fill pump. Equally, should the return connection be the lowest point in the solar loop, a
suitable drain device should be installed in the lowest point.
5.8 Secondary return
A ½” boss is provided on the SCxn…sd/si cylinder range to connect a secondary return
loop to 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 reli-
able 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
The location of the secondary return connection on the cylinder is highlighted in Figure
2.
5.10 Installation expansion vessel
Optional for standard SCxn d/i cylinders, mandatory for solar SCxn d/I cylinders.
The expansion vessel can be connected directly to the cold water inlet group utilising
the flexible hose supplied with the vessel. It is important not to install any isolating de-
vices between the vessel and the cold water inlet group.
Further it is recommended to mount the vessel higher than the cylinder to avoid having
to drain the cylinder when maintaining and replacing the expansion vessel. The connec-
tion of the expansion vessel to the inlet group is shown in Figure 10.
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