Unvented Hot Water Cylinder
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Warning : Ensure that the expansion relief valve is not covered or closed
Install the discharge pipe of the expansion relief valve with a constant fall to the outside. The discharge pipe must finish
at a safe and visible height where there is no danger of it freezing and where there is no danger of injury to persons.
Actuate the expansion relief valve regularly to prevent scaling.
Connect the cylinder via the cylinder connection
Use 22mm copper pipe to connect the cylinder from the main stop valve to ensure that the cylinder is as efficient as
possible. This is particularly important for installations with a balance cold water inlet
Install the safety assembly in the cold mains inlet on the cylinder
If necessary establish the connection to the cold water inlet with pressure compensation of the safety assembly
Dependent on the fittings used and the type of draw off points it may be necessary to install a backflow preventative
device in the cold water inlet.
WARNING: Water temperature over 50°C running from taps may immediately cause serious burns. Children,
disabled and elderly run a greater risk in this regards. Therefore it is advisable to use a thermostat mixing valve
connected to the water outlet or where preferred at the point of use.
Expansion vessel
To prevent any overpressures that might damage the equipment, frequently triggering the safety unit and causing water
dripping, it is mandatory that you install the expansion vessel included in the kit. Install it in accordance with the
instructions provided by the manufacturer. The expansion cylinder is required to keep pressure constant and avoid harmful
pressure shocks or accidental overpressures.
CAUTION! It is essential you install the expansion vessel vertically with connection at the bottom (see the figure
below)
CAUTION: Where secondary return circuits are used (SR) an additional expansion vessel may be required
