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Pump installation
UNDER NO CIRCUMSTANCES MUST A PUMP BE FITTED DIRECTLY TO THE WATER MAIN.
PLEASE REFER TO THE MANUFACTURERS PUMP INSTALLATION GUIDE FOR PUMP INSTALLATION
INFORMATION.
Care should be taken to ensure that there is adequate flow through the pump to activate the flow switches.
A pump must only be used to boost the pressure from tank-fed supplies. A typical layout is shown on page 6.
A minimum 1.5 bar twin ended booster pump may be fitted with the Aqualisa bar valve product. If fitting a booster
pump, we recommend a twin ended booster pump larger than 1 bar is used.
Stored water capacities
The minimum capacity of the cold storage cistern should not be less than 225 litres (50 gallons). The capacity of the
hot cylinder must be capable of meeting the anticipated demand.
Balanced high-pressure systems
The Aqualisa bar valve is designed to operate with unvented hot water storage systems up to a maximum pressure of
10 bar. The cold water supply must be drawn from the same mains supply as that to the hot water system (down
stream of the cylinder manufacturers pressure limiting valve, where supplied) and the hot supply from the nearest
convenient draw off point. Account must be taken of pressure drops that may occur when other draw-off points are
used while the shower is in use. A typical layout is shown on page 7.
Combination boiler/multipoint systems
The Aqualisa bar valve is suitable for use with combination boiler systems. The combination boiler MUST have a
minimum rating of 24kW (80,000 Btu) and be of the type fitted with a fully modulating gas valve.
This is sufficient to operate one outlet point at a time. The cartridge is designed to operate from the mains at a
maximum of 10 bar. If the mains pressure exceeds 5 bar a ‘drop tight’ PRV must be fitted on the supply pipe after
the main stopcock.
If in any doubt, please contact the appliance manufacturer before installation commences.
The cold supply can be taken from the nearest convenient mains supply and the hot supply can be taken from the
nearest hot water draw-off point. Account must be taken of the pressure drops that will occur when other draw-off
points are used while the shower is in use. A typical layout is shown on page 7.
When fitted to combination boiler systems, the Aqualisa bar valve has been designed to give optimum temperature
control and stability from fully modulating combination boilers and instantaneous gas water heaters.
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