Mira Element Thermostatic Mixer User manual

1
MIRA ELEMENT
Installation and User Guide
THERMOSTATIC MIXER
These instructions must be left with the user.

2
CONTENTS
Introduction .............................................................................................3
Guarantee ............................................................................................4
Recommended Usage..........................................................................4
Patents and Design Registration..........................................................4
Safety : Warnings ....................................................................................5
Pack Contents .........................................................................................6
Dimensions ..............................................................................................8
Specications ..........................................................................................9
Operating Parameters..........................................................................9
Installation Requirements .................................................................... 11
Installation .............................................................................................13
General...............................................................................................13
Installation Methods ...........................................................................14
Exposed Thermostatic Mixer ...............................................................15
1. Rear Entry Supplies (rising or falling concealed pipework)............ 15
2. Rising or Falling Supplies...............................................................17
Built-in Thermostatic Mixer ..................................................................19
1. Solid Wall or Stud Partition
(Using Securing Brackets - Mounting off Front Face of Wall) ....19
2. Solid Wall or Stud Partition
(Using Rear Fixing Points on the Thermostatic Mixer)............... 22
3. Laminated Panel
(Using Securing Brackets - Mounting on Rear Face of Wall)..... 24
Control Assembly (Built-in Models) ....................................................26
Reversed Inlet Supplies........................................................................27
Commissioning .....................................................................................29
Maximum Temperature Setting ..........................................................29
Operation ...............................................................................................30
Fault Diagnosis......................................................................................31
Maintenance...........................................................................................32
Type 2 Valves .........................................................................................36
Spare Parts ............................................................................................37
Accessories ...........................................................................................41
Customer Service....................................................................Back Page

3
INTRODUCTION
If you experience any difculty with the installation or operation of your new
Thermostatic Mixer, please refer to ‘Fault Diagnosis’, before contacting Kohler Mira
Ltd. Our telephone and fax numbers can be found on the back cover of this guide.
Thank you for purchasing a quality Mira product. To enjoy the full potential of your
new product, please take time to read this guide thoroughly, having done so, keep
it handy for future reference.
The Mira Element Thermostatic Mixer is a Thermostatic Shower Control with a single
control lever for on/off and temperature control.
There is no adjustable ow control. A 12 L/Min ow regulator is supplied for high
pressure systems to reduce excessive shower force.
The Thermostatic Mixer incorporates a wax capsule temperature sensing unit, which
provides an almost immediate response to changes in pressures or temperature of
the incoming water supplies to maintain the selected temperature. An adjustable
maximum temperature stop is provided which limits the temperature to a safe level.
Inlet Filters are tted to protect the thermostatic cartridge.
Mira Element Exposed: Thermostatic Mixer for connection to rising, falling or rear
entry pipework, supplied with L10 EV Shower Fittings.
Mira Element Built-in: Thermostatic Mixer for connection to concealed pipework,
supplied with L10 BIV or BIR Shower Fittings.
This product has been certied as a Type 2 valve under the BUILDCERT TMV2
scheme. This product also complies with the Water Supply (water ttings) Regulations
1999.

4
Guarantee
For domestic installations, Mira Showers guarantee the Mira Element against
any defect in materials or workmanship for a period of ve years from the date of
purchase (shower ttings for one year).
For non-domestic installations, Mira Showers guarantee the Mira Element against
any defect in materials or workmanship for a period of one year from the date of
purchase.
For terms and conditions refer to the back cover of this guide.
Recommended Usage
Application Valve with Fittings
Domestic
Light Commercial
Heavy Commercial
Healthcare
Patents and Design Registration
Design Registration: 000555768-0006, 000555768-0007
Patents: GB: 2 291 693, 2 392 225, 2 421 297
Germany: 695 13 455.8
France: 0 694 721 (E)
USA: 7 240 850
Patent Applications: GB: 0621637.8
Euro: 1 672 257, 03254070.0
USA: 2006-0124758-A1

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SAFETY : WARNINGS
This Mira Element Thermostatic Mixer is precision engineered and should give
continued safe and controlled performance, provided:
1. It is installed, commissioned, operated and maintained in accordance with
manufacturers recommendations.
2. Periodic attention is given, when necessary, to maintain the product in good
functional order.
Caution!
1. Read all of these instructions.
2. Retain this guide for later use.
3. Pass on this guide in the event of change of ownership of the installation
site.
4. Follow all warnings, cautions and instructions contained in this guide.
5. Anyone who may have difculty understanding or operating the controls of any
shower should be attended whilst showering. Particular consideration should
be given to the young, the elderly, the inrm or anyone inexperienced in the
correct operation of the controls.
6. When this product has reached the end of its serviceable life, it should be
disposed of in a safe manner, in accordance with current local authority
recycling, or waste disposal policy.

6
PACK CONTENTS
Tick the appropriate boxes to familiarize yourself with the part names and to
conrm that the parts are included.
1 x Mira Element Thermostatic Mixer
1 x ‘O’ Key
2 x Olives
2 x Compression
Nuts
2 x Concealing
Plates
1 x 2.5 mm
Hexagon Key
2 x No 8 x 1 ¼”
Securing Screws
2 x Wall Plugs
Documentation
1 x Guarantee Registration Document
1 x Installation Template
1 x 12 L/Min
Flow Regulator
Exposed Element Thermostatic Mixer

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Built-in Element Thermostatic Mixer
Documentation
1 x Guarantee Registration Document
1 x 2.5 mm
Hexagon Key 2 x No 8 x 1 ¼”
Screws
2 x Wall Plugs
1 x 12 L/Min
Flow Regulator
3 x Olives
3 x Compression
Nuts
1 x Mira Element Thermostatic Mixer
(attached to the Building-in Shroud)
1 x Control Assembly
2 x M5 x 40 mm
Screws
2 x Securing
Brackets
1 x ‘O’ Key
2 x Bracket
Securing Screws

8
DIMENSIONS
153120
Ø70
35
Ø56
109
30
67 - 85
Building-in Depth
56 183
All dimensions in mm.
Exposed Element Thermostatic Mixer
Built-in Element Thermostatic Mixer
108

9
SPECIFICATIONS
Operating Parameters
For Type 2 Valves, the supply conditions specied in section: ‘Type 2 Valves -
Application’ take precedence over the operating parameters which follow.
Pressures
Maximum Static Pressure: 10 Bar.
Maximum Maintained Pressure: 5 Bar.
Minimum Maintained Pressure (Gas Water Heater): 1.0 Bar.
(for optimum performance supplies should be nominally equal).
Minimum Maintained Pressure (Gravity System): 0.1 Bar.
(0.1 bar = 1 Metre head from base of cold tank to the outlet of the
shower handset).
Temperatures
Factory Pre-set (Blend) Shower: 43°C.
Optimum Thermostatic Control Range: 35°C - 45°C.
(Achieved with supplies of 15°C cold, 65°C hot and nominally equal
pressures).
Recommended Hot Supply: 60°C - 65°C.
Note! The Mixing Valve can operate at temperatures up to 85°C for short periods
without damage. However for safety reasons it is recommended that the maximum
hot water temperature is limited to 65°C.
Minimum Differential between Hot Supply and Outlet Temperature: 10°C.
Cold Water Range: 5°C - 25°C.
Thermostatic Shut-down
For safety the Thermostat will shut off the Hot Supply Within 2 Seconds if the Cold
Supply Fails.
(Achieved only if the hot supply temperature is greater than 10°C above the set
blend temperature).
Connections
Exposed Mixer:
Inlets: 15 mm Compression, Hot - Left, Cold - Right.
Outlet: ½” BSP Flat Face, Bottom - Outlet.
Built-in Mixer:
Inlets: 15 mm Compression, Hot - Left, Cold - Right.
Outlet: 15 mm Compression, Top - Outlet.
If reversed inlets are required refer to section: ‘Reversed Inlet Supplies’.

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Flow Rates
Typical Flow Rates on Low Pressure Systems (0.1 Bar to 1 Bar) - Mira Element with
L10 Adjustable Fittings or Rigid Head:
Typical Flow Rates on High Pressure Systems (1 Bar to 5 Bar, with 12 Litre/Min
Flow Regulator tted in shower control outlet) - Mira Element with L10 Adjustable
Fittings or Rigid Head:

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INSTALLATION REQUIREMENTS
Isolating Valve
Thermostatic Mixer
Overow Indicator
Pressure Reducing Valve
Float Valve Twin Impeller Pump
Single Impeller Pump
Tempering Valve
Mini Expansion Vessel
Key to Symbols
The Mira Element Thermostatic Mixer is compatible with the following systems:
Gravity fed system
The Thermostatic Mixer MUST be fed from
a cold water cistern and hot water cylinder
providing nominally equal pressure.
Gas heated system
The Thermostatic Mixer MUST be installed
with a gas water heater or combination
boiler of a fully modulating design.
Note! We recommend the use of a
12 L/Min Outlet Flow Regulator (supplied).
However, it is possible following the
installation of the Flow Regulator that the
ow rate is reduced too much for the boiler
to ignite. If this is the case remove the ow
regulator.

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Unvented mains pressure system
The Thermostatic Mixer can be installed
with a unvented, stored hot water
cylinder.
Note! We recommend the use of a 12 L/Min
Outlet Flow Regulator (supplied).
Mains pressurised instantaneous hot
water system (thermal store)
The Thermostatic Mixer can be installed
with systems of this type with balanced
pressures.
Note! We recommend the use of a 12 L/Min
Outlet Flow Regulator (supplied).
Pumped system
The Thermostatic Mixer can be installed
with an inlet pump (twin impeller). The pump
must be installed on the oor next to the hot
water cylinder.
Note! We recommend the
use of a 12 L/Min Outlet
Flow Regulator (supplied).
Air Separation
30°-60°
90°

13
INSTALLATION
General
Installation must be carried out in accordance with these instructions, and must be
conducted by designated, qualied and competent personnel.
The installation must comply with the “Water Supply Regulations 1999 (Water Fittings)”
or any particular regulations and practices, specied by the local water company or
water undertakers.
Note! Make sure that all site requirements correspond to the information given in
section: ‘Specications’. For Type 2 Valves see also supply conditions in section:
‘Type 2 Valves’.
1. The Mixer must not be installed in an area where it may freeze.
2. For stud partitions alternative xings may be required.
3. Isolating valves must be installed close to the Mixer for ease of maintenance.
4. Pipework must be rigidly supported and avoid any strain on the connections.
5. Pipework dead-legs should be kept to a minimum.
6. Supply pipework layout should be arranged to minimise the effect of other outlet
usage upon the dynamic pressures at the Mixer inlets.
7. Inlet and outlet threaded joint connections should be made with PTFE tape or
liquid sealant. Do not use oil-based, non-setting joint compounds.
8. To eliminate pipe debris it is essential that supply pipes are thoroughly ushed
through before nal connection.
9. Decide on a suitable position for the
Mixer. The position of the Mixer and
the Shower Fittings must provide
a minimum gap of 25 mm between
the spill-over level of the shower
tray/bath and the handset. This is to
prevent back-siphonage. For further
information on the installation of your
Shower Fittings, refer to the Fittings
Installation and User Guide.
Note! Only use Shower Fittings
recommended by the manufacturer
or supplier. 25 mm
Spill Over
Level
Hose Retaining Ring

14
Rear Entry Supplies
Rising or Falling Supplies
Securing Brackets
(Mounting on Front
Face of Wall)
Mounting using
Rear Fixing Points
Securing Brackets
(Mounting on Rear
Face of Wall)
Installation Methods
Exposed Element Thermostatic Mixer
The Exposed Element Mixer can be
installed with rear, rising or falling supply
inlets.
For rear entry supplies, go to section:
‘Exposed Thermostatic Mixer, 1. Rear
Entry Supplies’.
For rising or falling supplies, go to section:
‘Exposed Thermostatic Mixer, 2. Rising
or Falling Supplies’.
Built-in Element Thermostatic Mixer
The Built-in Element Mixer can be
installed with rising or falling supply inlets
(rising inlets are illustrated).
The Mixer can be installed using Rear
Fixing Points on the Body, or by using the
Securing Brackets (supplied) on the Front
Face of a Solid Wall or Stud Partition, or on
the Rear Face of a Laminated Panel.
For installation into a Solid Wall or Stud
Partition using the Securing Brackets, go
to section: ‘Built-in Thermostatic Mixer,
1. Solid Wall or Stud Partition (Using
Securing Brackets - Mounting on Front
Face of Wall)’.
For installation into a Solid Wall or Stud
Partition using the Rear Fixing Points, go
to section: ‘Built-in Thermostatic Mixer,
2. Solid Wall or Stud Partition (Using
Rear Fixing Points on Thermostatic
Mixer)’.
For installation behind a Laminated
Panel using the Securing Brackets, go to
section: ‘Built-in Thermostatic Mixer,
3. Laminated Panel (Using Securing
Brackets - Mounting on Rear Face of
Wall)’.

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Exposed Thermostatic Mixer
1. Rear Entry Supplies (rising or falling concealed pipework)
1.1 Use the Installation Template to mark the positions of the holes for the Backplate
and the pipe centres.
Note! Allow a minimum of 150 mm either side of the Mixer, to allow access to
the hot and cold Inlet Filters for servicing.
40 mm
153 mm
Shower Control
Backplate Fixing Points
(Ø6 mm)
Bend tabs inwards
Use as a support for the spirit level
Bend tabs inwards
Use as a support for the spirit level
Hot Supply Inlet
(Ø15 mm)
Make sure that supply pipes are thoroughly flushed through
before connection to the shower control
Cold Supply Inlet
(Ø15 mm)
153 mm 150 mm
40 mm
150 mm
Ø32 mm x 10 mm depth
for Concealing Plates
153 mm
Apply Silicone
Sealant
Backplate
Concealing Plates
10 mm minimum
between Elbow
and nished wall
surface
32 mm
18 mm from
nished wall
surface
Elbow
1.2 For solid walls drill the holes for the Backplate with a 6 mm drill and insert the
Wall Plugs (supplied). For other types of wall structure alternative xings may
be required (not supplied).
1.3 Drill the holes for the supply pipes at 153 mm centres.
1.4 Recess the wall to allow for the Concealing Plates, Ø 32 mm x 10 mm deep.
Note! Depth must be sufcient to prevent the Concealing Plates fouling on the
plumbing Elbows.
1.5 Fit the supply pipework (Hot - Left, Cold - Right). The pipework must project
18 mm from the nished wall surface at 153 mm centres (use the Installation
Template as a guide).
Note! If the connections are reversed, complete the installation then refer to
section: ‘Reversed Inlet Supplies’ before commissioning.
Hot
Cold

16
1.6 Loosen the Grubscrew with the 2.5 mm Hexagon Key (supplied) and remove
the Backplate from the Mixer.
1.7 Secure the Backplate to the wall using the Screws (supplied).
1.8 Fit the Concealing Plates.
Note! Apply silicone sealant to the back face of the ange.
Caution! It is essential at this point that the supply pipework is thoroughly
ushed through before connection to the Mixer. Failure to do so may result in
product malfunction.
1.9 Fit the Compression Nuts and Olives onto the pipework.
1.10 Align the Mixer with the pipework and t onto the Backplate.
1.11 Tighten the Compression Nuts onto the Mixer with a suitable Spanner.
Caution! Take care not to damage the chrome surfaces.
1.12 Tighten the Grubscrew to secure the Mixer to the Backplate.
1.13 Fit the Shower Fittings, refer to your Shower Fittings Installation and User
Guide for Instructions.
Note! For high pressure systems, a 12 litre/minute Flow Regulator (supplied)
can be tted under the Hose Washer (refer to illustration).
1.14 Turn on the hot and cold water supplies and check for leaks.
1.15 Before using the Shower, refer to section: ‘Commissioning’.
Flow regulator
(for high pressure
systems)
Grubscrew
Hot
Cold

17
2. Rising or Falling Supplies
35 mm
2.1 Loosen the Grubscrew on each
Elbow using the 2.5 mm Hexagon
Key (supplied) and rotate the Elbow
90° as required. Retighten the
Grubscrews.
2.2 Use the Installation Template to mark
the positions of the xing holes for the
Backplate.
Note! Allow a minimum of 150 mm
either side of the Mixer, to allow
access to the hot and cold Inlet Filters
for servicing.
Wall Plugs
40 mm
153 mm
Shower Control
Backplate Fixing Points
(Ø6 mm)
Bend tabs inwards
Use as a support for the spirit level
Bend tabs inwards
Use as a support for the spirit level
Hot Supply Inlet
(Ø15 mm) Make sure that supply pipes are thoroughly flushed through
before connection to the shower control
Cold Supply Inlet
(Ø15 mm)
153 mm
150 mm 150 mm
40 mm
35 mm
35 mm
35 mm
2.3 For solid walls drill the holes for
the Backplate with a 6 mm drill and
insert the Wall Plugs (supplied).
For other types of wall structure
alternative xings may be required
(not supplied).
2.4 For Falling Supplies: Using the
Installation Template as a guide,
mark the pipe positions on the ceiling
and set the 35 mm centres from the
nished wall (refer to illustration).
For Rising Supplies: Using the
Installation Template as a guide,
mark the pipe positions and set the
35 mm centres from the finished
wall.
153 mm

18
Flow regulator
(for high pressure
systems)
Grubscrew
2.5 Fit the supply pipework (Hot - Left,
Cold - Right).
Note! If the connections are reversed,
complete the installation then refer to
section: ‘Reversed Inlet Supplies’
before commissioning.
2.6 Loosen the Grubscrew with the
2.5 mm Hexagon Key (supplied)
and remove the Backplate from the
Mixer.
2.7 Secure the Backplate to the wall
using the Screws (supplied).
Caution! It is essential at this point
that the supply pipework is thoroughly
ushed through before connection to
the Mixer. Failure to do so may result
in product malfunction.
2.8 Fit the Compression Nuts and Olives
onto the pipework.
2.9 Align the Mixer with the pipework and
t onto the Backplate.
2.10 Tighten the Compression Nuts onto
the Mixer with a suitable Spanner.
Caution! Take care not to damage
the chrome surfaces.
2.11 Tighten the Grubscrew to secure the
Mixer to the Backplate.
2.12 Fit the Shower Fittings, refer to your
Shower Fittings Installation and User
Guide for Instructions.
Note! For high pressure systems,
a 12 litre/minute Flow Regulator
(supplied) can be tted under the
Hose Washer (refer to illustration).
2.13 Turn on the hot and cold water
supplies and check for leaks.
2.14 Before using the Shower, refer to
section: ‘Commissioning’.
Hot
Cold

19
Built-in Thermostatic Mixer
1. Solid Wall or Stud Partition
(Using Securing Brackets - Mounting off Front Face of Wall)
Outlet Pipe BIR
Outlet Pipe BIV Outlet Pipe BIV
Cold InletHot Inlet
Thermostatic
Mixer
Alternative Pipe
Layouts
62 mm Min
24 mm Max
Finished Wall
6 mm Min
Finished Wall
Finished Wall
Surface
1.1 Determine the route for the hot and
cold supply pipework and for the
outlet pipework. When connecting
to the BIV Shower Fittings it is
recommended that the outlet be
positioned above and to one side
of the Mixer. This is to prevent the
Flexible Hose from obstructing the
Shower Controls.
1.2 Remove the two Shroud Screws
(retain for later use) and remove the
Mixer from the Building-in Shroud.
1.3 Determine the position of the Mixer
and draw around the Building-in
Shroud.
1.4 Mark the routes for the hot and cold
supply pipework at 108 mm centres
(Hot - Left, Cold - Right).
Falling Supplies: For falling supplies
loosen the Grubscrew on each Elbow
using the 2.5 mm Hexagon Key
(supplied). Remove the Elbows and
install on opposite sides. Retighten
the Grubscrews.
Caution! Do not overtighten.
Note! Make sure that the ‘O’ Seals
are correctly fitted and that the
Filter Plugs are positioned to the
front (i.e. Hexagonal Key facing
forward).
1.5 Mark the route for the outlet
pipework.
Note! The Outlet Elbow should be
sited above the Mixer and on the right
or left, as site dictates.
1.6 Remove the plasterboard and/or
brick work to a minimum depth of
62 mm.
Securing
Bracket

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Rotate for Suitable
Fixing Point
Backplate
Securing Hole
Backplate
Securing Hole
Countersunk Fixing Hole
Screws
Outlet Pipe to Fittings
Hot Supply
Cold Supply
1.7 Fit the Securing Brackets to the Mixer
with the Bracket Securing Screws.
Important! Make sure that the
correct holes are used, otherwise the
Backplate cannot be tted.
Note! The Securing Brackets can be
rotated for suitable xing points.
1.8 Make sure that the Mixer is level and
mark the positions for the countersunk
xing holes on the wall.
1.9 For solid walls drill two 6 mm holes
for the Wall Plugs.
Caution! Do not drill into pipes in the
wall.
1.10 Fit the Wall Plugs (supplied) and x
the Mixer to the wall with the Screws
provided.
Note! For stud partition installations
alternative xings may be required
(not supplied).
1.11 Connect the hot and cold supply
pipes and tighten the Compression
Nuts.
Caution! Make sure that the Olives
are tted and all pipework is ushed
through before connecting to the
Mixer.
1.12 Connect the outlet pipework, leaving
enough pipe through the wall to
temporarily cap off (refer to your
Shower Fittings Installation and User
Guide).
1.13 Turn on the water supplies and check
for leaks.
Note! Securing Brackets shown
in preferred position to allow the
Compression Nuts to be tightened.
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