6
Siting
For optimum performance, with gravity fed systems, the distance between the bottom of the storage cistern and
the shower head should not be less than 1m (when using an adjustable height shower kit). Please refer to the
system layouts on page 7.
Pump installation
UNDER NO CIRCUMSTANCES MUST A PUMP BE FITTED DIRECTLY TO THE WATER MAIN.
A pump must only be used to boost the pressure from tank-fed supplies. A typical layout is shown on page 7.
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 system
The Midas high pressure product range 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 8.
Combination boiler/multipoint system
The Midas high pressure product range 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 Midas 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.
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 8.
When fitted to combination boiler systems, Midas exposed shower valves have been designed to give optimum
temperature control and stability from fully modulating combination boilers and instantaneous gas water heaters.
The Midas high pressure exposed shower valves are supplied complete with flow regulators to control the incoming hot
water flow rate into the cartridge. The following regulators should be fitted to suit the relevant rated appliance as listed
below:
YELLOW = 24kW (80,000 Btu) boiler
GREEN = 28kW (100,000 Btu) boiler
BLUE = 35+kW (120,000+Btu) boiler
Please refer to page 12 for fitting the regulator instructions.
N.B. The inlet flow regulators are not recommended for use with Midas bath/shower mixer valves.
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