Mira Excel Installation & User Manual page 42

Malfunction
Excel noisy during
operation.
Only full hot or full
cold available.
Unable to turn off
flow. Unable to
rotate flow knob.
Cause
High inlet supply
pressures.
Unbalanced inlet
supply pressures.
High inlet supply
pressures.
Reversed inlet
supplies.
Inlet strainer blocked.
Control knobs fitted
incorrectly.
Remedy
Maximum maintained
pressure for shower
should not exceed 5 bar.
If greater fit a drop tight
pressure reducing valve
(PRV) just after the
property incoming mains
stopcock, effectively
balancing the hot and
cold supply pressures.
Ideally set the PRV at
3.5 bar.
Balance Excel inlet
supply pressures. Fit a
drop tight PRV just
after the incoming
mains stopcock,
effectively balancing
the hot and cold supply
pressures. Ideally set
the PRV to 3.5 bar.
Maximum maintained
pressure for shower
should not exceed 5
bar. If greater fit a drop
tight (PRV) installed as
detailed above.
Refer to Section 9,
Reversed Inlet
Connections.
Clean or renew.
Refer to Section 8,
Control Assembly
Fitting Instructions.
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