Pressures; Gravity Systems - Aqualisa MIDAS 110 Installation And User Manual

Pressures

UK
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 SYSTEMS

The Midas 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. Refer to
diagram on page 8 ref point A or B.
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.
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