Aqualisa Midas - Pressures; Gravity Fed Hot and Cold Supplies

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Flushing
Some modern fluxes can be extremely corrosive and, if left in contact, will attack the working parts of this unit.
All soldering must be completed and the pipe work thoroughly flushed out in accordance with current Water Supply
Regulations prior to connection of the product.
Filters
To ensure optimum ongoing performance, the Midas product range is protected by inlet filter assemblies in the
internal waterways. Debris accumulation may result in progressively reduced flow through the showerhead and
noisy operation.
As this condition is not covered by our standard warranty terms, it is suggested that the cartridge be removed and
the filters checked by a competent person at least every 12 months. In the event of any difficulties please contact
the Aqualisa customer helpline for assistance.
Isolating valves
Suitable full way isolation valves must be fitted to both supplies in accordance with current Water Supply
Regulations and our terms of warranty.
Due to their restrictive characteristics, stopcocks and ball type valves that reduce the pipe bore size must not be
used on gravity or pumped installations.
Pressures
The Midas product range is designed to control static pressure up to 10 bar. Where pressures are likely to exceed
10 bar, a pressure reducing valve (PRV) must be fitted into the incoming mains supply. A setting of 3 bar is
recommended. It should be noted that daytime pressures approaching 8 bar can rise above the stated maximum
overnight.
A suitable PRV is available from Aqualisa.
The Midas product range is not suitable for mixed supply systems, e.g. gravity hot and mains cold.
Gravity fed hot and cold supplies
The specific low pressure Midas 200 shower valve is suitable for use with gravity systems.
Services must be installed according to good plumbing practice having regard to pipe sizing, long pipe runs and
low-head situations.
The cold supply for the valve assembly must be taken directly from the cold storage system. The hot supply may be
taken from the vent/draw off pipe of the hot water cylinder at a point below the cylinder connection or alternatively
from the underside of the horizontal draw off.
Rising pipe work must not be connected into the horizontal draw-off from the cylinder or to any point in the
vent/draw off pipe above the cylinder connection.
CYLINDER TEMPERATURE IN EXCESS OF 65ºC MAY RESULT IN POOR SHOWER PERFORMANCE.
To minimise pressure loss we recommend that the hot and cold supplies are run in 22mm as close as reasonably
possible to the mixing valve before reducing to 15mm to suit the intended inlet connection fittings.