6
Balanced high pressure system
The high pressure Opto cartridge (GREEN) is designed to operate with unvented hot water storage systems up to a maximum
pressure of 10 bar. A PRV must be used if either supply exceeds 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.
Pipe work can generally be run in 15mm.
A typical layout is shown on page 21.
Combination boiler/multipoint system
This product MUST NOT be fitted to an appliance rated at less than 80,000 Btu.
The Opto cartridge is designed to operate from the mains at a maximum of 10 bar. If the mains pressure exceeds 10 bar a ‘drop
tight’ PRV must be fitted on the supply pipe after the main stopcock.
For optimum performance the Opto product specifically for combination boiler systems is supplied with flow regulators to control the
incoming hot water pressure into the cartridge. The Opto combination boiler cartridge (PINK) is factory fitted with a YELLOW
regulator suitable for an 80,000 Btu boiler. The regulator should be changed to suit the relevant rated boiler as listed below:
YELLOW = 80,000 Btu boiler
OLIVE = 100,000 Btu boiler
BLUE = 120,000 Btu boiler
Please refer to pages 8 & 12 for changing the regulator instructions.
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.
Pipe work can generally be run in 15mm.
A typical layout is shown on page 21.
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