Mira 415 Installation And User Manual page 11

10. unvented mains pressure showers
The shower control can be installed with an unvented, stored hot water cylinder.
Only a "competent person" as defined by "Part G" of "Schedule 1" of the "Building
Regulations", may fit this type of system. For packages with no cold water
take off after the appliance pressure reducing valve, it will be necessary to fit
an additional pressure reducing valve, set at the same value as the unvented
package in the position shown dotted, when the mains pressure is over 5 bar,
refer to Figure 3. This does not apply to packages with a cold take off after the
pressure reducing valve.
The supply pressures should be between 1 bar and 5 bar to the Mira 415.
Safety devices have not been shown whithin
dotted line area for clarity of illustration
figure 3
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