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Remeha Flexistor Manual

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16
Pressure Relief Valve
This should be installed between the Pressure Reducing Valve and the Remeha Flexistor cylinder.
Should a balanced pressure cold water draw o󰀨 supply be required for the cold water outlets, this
should be taken o󰀨 between the Pressure Reducing Valve and Pressure Relief Valve.
Branches to drinking water outlets should be taken before the Pressure Relief Valve to avoid the
possibility of warm expanded water being drawn from the tap.
Drain valve
It is recommended that the drain valve (supplied) be incorporated into the cold water inlet system,
Figure 09, page 15. It is recommended that the outlet point of the drain pipe work be at least 1
metre below the level of the heater (this can be achieved by attaching a hose pipe to the drain
valve outlet spigot).
Outlet Pipe work
Ideally the pipe work from the Remeha Flexistor to the outlet ttings should be in 2” pipe, smaller
bore pipe can be used but it could impact on the performance of the unit. Small bore pipe can
also be used to suit some taps, but runs should be of minimum length. Pipe sizes may vary due
to system design.
Secondary Circulation
If a secondary circulation system is required it is recommended that it be connected to the
Remeha Flexistor similar to Figure 9, page 15. The secondary return pipe should be in 28mm
pipe and incorporate a check valve to prevent back ow, smaller pipe diameters can be used
but may have a reduced ow. A suitable WRAS approved circulation pump will be required. On
large systems, due to the increase in system water content, it may be necessary to t additional
expansion volume to the secondary system by tting an external expansion vessel to the circuit.
This should be done if the capacity of the secondary circuit exceeds 10 litres.
De-stratication kits
The correct size of de-stratication kit must be used with your cylinder to ensure the volume can
be circulated in 1 hour. The pump instructions will need to be reviewed for information on the cor-
rect setting. Please follow the installation schematic (Figure 9, page 15) for guidance. When the
system circulates it needs to be specied by the installer to ensure water is not drawn o󰀨 during
the de-stratication process. If a hot water demand is required during this period cold water may
be discharged from the hot outlet. It is recommended that a check valve be installed before the
pump to stop any risk of cold water draw o󰀨 through the pump when it is not in use. For guidance
on installation please refer to Figure 9, page 15.
External heat source
If an external heat source is connected the cylinder the control to the heat source must be wired
via the over temperature cut-out supplied with the cylinder, alternatively it can be wired to the
Primary circulation pump. This is to stop the external heat source from creating extreme tem-
peratures within the cylinder. The secondary circulation must be wholesome water as there is no
internal heat exchanger tted to this cylinder range.
The external heat source, if connected, must be able to withstand the cylinder working pressures
Tundish
The tundish should not be located adjacent to any electrical components.
Pipe capacities (copper)
22mm o/d = 0.38 litres per metre run (10 litres = 26m)
28mm o/d = 0.55 litres per metre run (10 litres = 18m)
35mm o/d = 0.83 litres per metre run (10 litres = 12m)
42mm o/d = 1.23 litres per meter run (10 litres = 8m)
… 16 …


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