Installer Maintenance - Mira Extreme Thermostatic Installation And User Manual

2. Installer Maintenance

The Mira Extreme is one part of an entire plumbing system. The fitting of a pump
places additional requirements on the plumbing system. Some systems may require
plumbing modifications to allow them to cope with higher flow rates.
Providing the Mira Extreme has been correctly installed and is operated as advised,
difficulties should not arise. Fault diagnosis and maintenance must be carried out
by a competent person for whom the fault diagnosis table is provided.
In the event of any of the following tests failing, re-check as appropriate before
contacting the Kohler Mira Ltd (our contact details can be found on the back cover
of this guide).
Malfunction
Shower runs for a short time
(30-60 seconds) then flow
reduces, splutters or stops.
Aggravated when other hot
taps are in use. Less evident
on full cold.
Shower runs cool after a short
time (1–2 minutes) then flow
splutters.
Flow of water virtually stops
and surges on/off, after a few
minutes.
Shower runs cold after 5–10
minutes.
Shower temperature affected
by use of adjacent hot/cold tap.
Maximum shower temperature
too hot.
Shower temperature too cold.
Cause
Air is being sucked down the
vent pipe, as the hot take off to
the shower is too high up the
pipe.
Air ingress into hot pipework.
Insufficient storage of cold
water in cistern (230 litres
recommended).
Insufficient storage of hot water
in cylinder.
Insufficiently sized pipework
for both systems to be used
together.
Incorrect setting of maximum
temperature.
Maximum temperature
incorrectly set.
Hot water cylinder temperature
less than 12°C above shower
temperature.
29
Remedy
Refer to plumbing system
diagrams in section:
'Installation Requirements'.
Note the 1 metre hot take-off
dimension. Consider increasing
cold feed pipe to cylinder to
28 mm diameter.
Refer to plumbing system
diagrams in section:
'Installation Requirements'.
Increase storage of cold water
cistern.
Increase storage of hot water.
Increase pipe sizes or
separately feed shower. Refer
to plumbing system diagrams
in the section: 'Installation
Requirements'.
Reset maximum
temperature, refer to section:
'Commissioning'.
Reset maximum
temperature, refer to section:
'Commissioning'.
Adjust cylinder temperature.
Note! It is recommended that
the stored water temperature
does not exceed 65°C.