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General Requirements
Siting The Unit
This unit can supply outlets above it or at some distance from it but any outlets above the unit will
reduce the available outlet pressure by 0.1 bar for every 1m of height dfference. The maximum length
of the "dead leg" should be as stated in the Water Supply (Water Fittings) Regulations 1999 G18.7,
in particular to the area of most frequent use.
Particular attention is needed if siting in a garage or outbuilding as the unit should be protected from
frost. All exposed pipework must be insulated. The unit must be installed upright on a base capable
of supporting its weight when full (please see the technical specification section for weights).
Sufficient access to allow maintenance of the valves should be considered. In addition the immersion
heaters are 400mm in length and this distance should be considered to allow withdrawal for servicing
if required. The discharge pipework from the safety valves should fall continuously and terminate safely.
Negative pressure may form in cylinders installed very high in a building. To counteract this, an anti-
vacuum valve can be installed to prevent damage to the cylinder. The anti-vacuum valve ensures
pressure compensation as a result of air flowing into the cylinder.
Connecting To The Cylinder
All of the pipework connections on the cylinder are compression connection and female threaded. Upon filling
and commissioning, ensure all connections are completely watertight.
No control or isolation valve should be fitted between the expansion relief valve and the
storage cylinder. The relief valve connections should not be used for any other purpose.
Cold Mains Pipework
Run the cold main through the building to the place where is to be installed. Take care not to run the
cold pipe near hot water or heating pipe work so that the heat pick-up is minimized. Identify the cold
water supply pipe and fit an isolating valve (not supplied). A 22mm BS1010 stopcock can typically be
used but a 22mm quarter turn full bore valve would be better as it does not restrict the flow as much.
Do not use "screwdriver slot" or similar valves.
Make the connection to the cold feed of the cylinder and incorporate a drain valve. Position the
inlet control just above the Temperature & Pressure Relief Valve (TPRV) mounted on the side of the
cylinder. This ensures that the cylinder does not have to be drained down in order to service the inlet
control set. Ensure that the arrow points in the direction of the water flow. Select a suitable position
for the expansion vessel. Mount it to the wall using the bracket provided.
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