Mira SELECT User manual

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

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CONTENTS
Introduction .............................................................................................3
Patents and Design Registration..........................................................3
Safety : Warnings....................................................................................4
Pack Contents .........................................................................................5
Dimensions..............................................................................................7
Specifications..........................................................................................8
Installation Requirements ....................................................................10
Installation .............................................................................................12
General............................................................................................... 12
Installation Methods ...........................................................................13
Exposed Thermostatic Mixer..............................................................14
1. Rear Entry Supplies (rising or falling concealed pipework)........ 14
2. Rising or Falling Supplies...........................................................16
Built-in Thermostatic Mixer................................................................. 18
1. Solid Wall or Stud Partition
(Using Securing Brackets - Mounting off Front Face of Wall) 18
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 Model) ......................................................27
Reversed Inlet Supplies........................................................................28
Commissioning .....................................................................................30
Operation ...............................................................................................31
Fault Diagnosis......................................................................................32
Maintenance...........................................................................................33
Type 2 Valves.........................................................................................37
Spare Parts ............................................................................................38
Customer Service....................................................................Back Page

3
INTRODUCTION
If you experience any difficulty 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.
Patents and Design Registration
Design Registration: 000578463-0004, 000578463-0005, 00578463-0006.
Patents: GB: 2 291 693, 2 392 225, 2 421 297.
Patent Applications: GB: 0512457.3.
Euro: 1 672 257, 03254070.0.
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 Select Thermostatic Mixer is a thermostatic Shower Control with separate
flow and temperature controls.
The Thermostatic Mixer incorporates a wax capsule temperature sensing unit, which
provides an almost immediate response to changes of temperature of the incoming
water supplies to maintain the selected showering temperature. An adjustable
temperature stop is provided which limits the maximum temperature to a safe level.
Inlet Filters are fitted to protect the thermostatic cartridge.
Mira Select Exposed: Thermostatic Mixer for connection to rising, falling or rear
entry pipework.
Mira Select Built-in: Thermostatic Mixer for connection to concealed pipework.
Includes Right Angle Connector (RAC) for connecting concealed pipework to exposed
shower fittings.
This product has been certified as a Type 2 valve under the BUILDCERT
TMV2 scheme. This product also complies with the water supply (water fittings)
regulations 1999.
Optimum performance of the Mira Select is achieved when used together with the
Mira Select Shower Fittings.

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SAFETY : WARNINGS
This Mira Select 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 the
manufacturer’s recommendations.
2. Periodic attention is given, when necessary, to maintain the product in good
functional order.
Caution!
1. Read all 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 difficulty understanding or operating the controls of any
shower should be attended whilst showering. Particular consideration should
be given to the young, the elderly, the infirm 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 and in accordance with the current local authority
recycling or waste disposal policy.

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PACK CONTENTS
Tick the appropriate boxes to familiarize yourself with the part names and to
confirm that the parts are included.
1 x Mira Select Shower Control
1 x “O” Key
2 x Olives
2 x Compression
Nuts
2 x Concealing
Plates
1 x Hexagon Key,
2.5 mm
2 x Screws,
No 8 x 1 ¼”
2 x Wall Plugs
Documentation
1 x Installation and User Guide
1 x Installation Template
1 x Flow Regulator,
12 L/Min
Exposed Select Thermostatic Mixer

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Built-in Select Thermostatic Mixer
Documentation
1 x Installation and User Guide
1 x Hexagon Key,
2.5 mm
2 x Screws,
No 8 x 1 ¼”
2 x Wall Plugs 1 x Flow Regulator,
12 L/Min
3 x Olives3 x Compression
Nuts
1 x Mira Select Shower Control
(attached to the Building-in Shroud)
1 x Control Assembly
2 x Screws,
M5 x 40 mm
2 x Securing
Brackets
1 x “O” Key
2 x Bracket Screws 1 x Right Angle Connector
Assembly (RAC)

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DIMENSIONS
149 - 154
134
Ø71
35
Ø56
114
30
67 - 85
Building-in Depth
71 Ø183
All dimensions are in mm.
Exposed Select Thermostatic Mixer
Built-in Select Thermostatic Mixer

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SPECIFICATIONS
Operating Parameters
For Type 2 valves, the supply conditions specified 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.
Minimum Maintained Pressure (Gravity System): 0.1 bar.
(0.1 bar = 1 metre head from the base of the cold tank to the outlet of the shower
handset.)
Note! For optimum performance the inlet pressures should be nominally equal and
should not exceed 3:1, in favour of either supply, during flow.
Temperatures
Factory Preset Shower Blend Temperature: 43 °C.
Optimum Thermostatic Control Range: 35 °C - 45 °C.
(Achieved with supplies of 15 °C cold, 65 °C hot and nominally equal pressures.)
Maximum Hot Supply: 85 °C.
Recommended Hot Supply: 60 °C - 65 °C.
Minimum differential between Hot Supply and set Blend Temperature: 10 °C.
Cold Water Range: 1 °C - 20 °C.
Note! BS:6700 recommends that the temperature of stored hot water should never
exceed 65 °C. A temperature of 60 °C is considered sufficient to meet all normal
requirements and will minimise the build up of scale in hard water areas.
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.”
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.)

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Flow Rates
Typical Flow Rates on Low Pressure Systems (0.1 bar to 1 bar) - Mira Select with
Mira Select Adjustable Fittings or Rigid Head:
Typical Flow Rates on High Pressure Systems (1 bar to 5 bar, with 12 Litre/Min. Flow
Regulator fitted in shower control outlet) - Mira Select with Mira Select Adjustable
Fittings or Rigid Head:
Supply Pressure (bar)
Supply Pressure (bar)

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INSTALLATION REQUIREMENTS
Isolating Valve
Thermostatic Mixer
Overflow Indicator
Pressure Reducing Valve
Float Valve Twin Impeller Pump
Single Impeller Pump
Tempering Valve
Mini Expansion Vessel
Key to Symbols
The Mira Select Thermostatic Mixer is compatible with the following systems:
Gravity fed system
The Shower Control MUST be fed from a
cold water cistern and hot water cylinder
providing nominally equal pressures.
Gas heated system
The Shower Control 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
flow rate is reduced too much for the boiler
to ignite. If this is the case remove the Flow
Regulator.

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Unvented mains pressure system
The Shower Control can be installed with
an 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 Shower Control can be installed with
systems of this type that have balanced
pressures.
Note!We recommend the use of a 12 L/Min.
Outlet Flow Regulator (supplied).
Pumped system
The Shower Control can be installed with
an inlet pump (twin impeller). The pump
must be installed on the floor 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°

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General
The installation must be carried out in accordance with these instructions, and must
be conducted by designated, qualified and competent personnel.
The installation must comply with the “Water Supply Regulations 1999 (Water Fittings)”
or any particular regulations and practices as specified by the local water company
or water undertakers.
Note! Make sure that all site requirements correspond to the information given
in section: “Specifications.” For further details on Type 2 valves refer to 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 fixings may be required.
3. Isolating valves must be installed close to the Shower for ease of
maintenance.
4. Pipework must be rigidly supported. 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 any other
outlet draw off upon the dynamic pressures at the Shower inlets, e.g. flushing
toilet. This is particularly important for gravity fed installations.
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 flushed
through before final 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 the Shower Fittings, refer to the
“Shower Fittings Installation and User
Guide.”
Note! Only use Shower Fittings
recommended by the manufacturer or supplier.
INSTALLATION
25 mm
Spill Over
Level
Hose Retaining
Ring

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Rear Entry Supplies
Rising or Falling Supplies
Securing Brackets
(mounting on front
surface of wall)
Mounting using
rear fixing points
Securing Brackets
(mounting on rear
surface of wall)
Installation Methods
Exposed Select Thermostatic Mixer
The ExposedSelect Mixer can be installed
with rear, rising or falling supply inlets.
The exposed model has inlet elbows
which adjust between 149 mm - 154 mm.
This feature assists the installation onto
misaligned pipework.
For rear entry supplies, refer to section:
“Exposed Thermostatic Mixer, 1. Rear
Entry Supplies” for further details.
For rising or falling supplies, refer to
section: “Exposed Thermostatic Mixer,
2. Rising or Falling Supplies” for further
details.
Built-in Select Thermostatic Mixer
The Built-in Select Mixer can be installed
with rising or falling supply inlets (rising
inlets are illustrated).
The unit can be installed using the rear
fixing points, or by using the Securing
Brackets (supplied) on the front surface of
a solid wall or stud partition, or on the rear
surface of a laminated panel.
For an installation into a solid wall or stud
partition using the Securing Brackets, refer
to section: “Built-in Thermostatic Mixer,
1. Solid Wall or Stud Partition (Using
Securing Brackets - Mounting on Front
Face of Wall)” for further details.
For an installation into a solid wall or stud
partition using the rear fixing points, refer
to section: “Built-in Thermostatic Mixer,
2. Solid Wall or Stud Partition (Using
Rear Fixing Points on Thermostatic
Mixer)” for further details.
For an installation behind a laminated
panel using the Securing Brackets, refer
to section: “Built-in Thermostatic Mixer,
3. Laminated Panel (Using Securing
Brackets - Mounting on Rear Face of
Wall)” for further details.

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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 unit, 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 finished wall
surface
32 mm
13 mm from
finished wall
surface
Elbow
1.2 For solid walls drill the holes for the Backplate with a 6 mm diameter drill and
insert the Wall Plugs (supplied). For other types of wall structure alternative
fixings may be required (not supplied).
1.3 Drill the holes for the supply pipes at 153 mm centres.
1.4 Create a recess in the wall to allow for the Concealing Plates, 32 mm diameter x
10 mm deep.
Note! Depth must be sufficient to prevent the Concealing Plates fouling on the
plumbing Elbows.
1.5 Fit the supply pipework (Hot - Left, Cold - Right). The pipework must project
13 mm from the finished 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

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1.6 Loosen the Grubscrew with the 2.5 mm Hexagon Key (supplied) and remove
the Backplate from the unit.
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 flange.
Caution! It is essential at this point that the supply pipework is thoroughly
flushed through before connection to the unit. Failure to do so may result in
product malfunction.
1.9 Fit the Compression Nuts and Olives onto the pipework.
1.10 Align the unit with the pipework and fit onto the Backplate. Minor misalignment
of the pipework can be accommodated by the inlets, which are adjustable
between 149 and 154 mm centres.
1.11 Tighten the Compression Nuts onto the Elbows with a suitable spanner.
Caution! Take care not to damage the chrome surfaces.
1.12 Tighten the Grubscrew to secure the unit to the Backplate.
1.13 Fit the Shower Fittings. Refer to “Shower Fittings Installation and User
Guide” for instructions.
Note! For high pressure systems, a 12 litre/minute white Flow Regulator
(supplied) can be fitted 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” for testing the
unit is operating correctly.
Flow Regulator
(for high pressure
systems)
Grubscrew
Hot
Cold

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2. Rising or Falling Supplies
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 fixing holes for the
Backplate.
Note! Allow a minimum of 150 mm
either side of the unit to allow servicing
of the hot and cold Inlet Filters.
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 diameter drill
and insert the Wall Plugs (supplied).
For other types of wall structure,
alternative fixings may be required
(not supplied).
2.4 Forbothrisingandfallingsupplies:
Using the Installation Template as
a guide, mark the pipe positions
on the ceiling and set the centres
35 mm from the finished wall
(refer to illustration). 153 mm

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Flow Regulator
(for high pressure
systems)
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
flushed through before connection to
the unit. Failure to do so may result
in product malfunction.
2.8 Fit the Compression Nuts and Olives
onto the pipework.
2.9 Align the unit with the pipework
and fit onto the Backplate. Minor
misalignment of the pipework can be
accommodated by the inlets, which
are adjustable between 149 and
154 mm centres.
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
unit to the Backplate.
2.12 Fit the Shower Fittings. Refer to the
“Shower Fittings Installation and
User Guide” for further details.
Note! For high pressure systems, a
12 litre/minute white Flow Regulator
(supplied) can be fitted 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”
for testing the unit is operating
correctly.
Grubscrew

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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 unit. This is to prevent the
Flexible Hose from obstructing the
Shower Controls.
1.2 Remove the two Shroud Screws
(retain for later use) and separate the
unit from the Building-in Shroud.
1.3 Determine the position of the unit
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).
Fallingsupplies: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.
Note! Make sure that the ‘O’ Seals
are correctly fitted and that the
Filter Plugs are positioned to the
front (i.e. hexagonal key hole facing
forward).
1.5 Mark the route for the outlet
pipework.
Note! The Outlet Elbow should be
sited above the unit 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
Shroud
Screws
(retain for
later use)

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Rotate for Suitable
Fixing Point
Backplate
securing hole
Rear Fixing Point
Countersunk Fixing Hole
Screws
Outlet Pipe to Fittings
Hot Supply
Cold Supply
1.7 Fit the Securing Brackets to the unit
with the Bracket Screws.
Important! Make sure that the
correct holes are used, otherwise the
Backplate cannot be fitted.
Note!The Securing Brackets can be
rotated for suitable fixing points.
1.8 Making sure that the unit is level, mark
the positions for the countersunk
fixing holes on the wall.
1.9 For solid walls, drill two 6 mm
diameter holes for the Wall Plugs.
Caution! Do not drill into pipes or
electrical cables buried in the wall.
1.10 Fit the Wall Plugs provided and fix
the unit to the wall with the Screws
provided.
Note! For stud partition installations,
alternative fixings 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 fitted and all pipework is flushed
through before connecting to the
unit.
Note! Securing Brackets shown
in preferred position to allow the
Compression Nuts to be tightened.

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1.12 Connect the outlet pipework, leaving
enough pipe to connect a 1/2” BSP
female fitting (not supplied) to
the Right Angle Connector (RAC)
assembly.
1.13 When the 1/2” BSP female fitting
and brass nipple have been fitted to
the outlet pipework, temporarily seal
off the open end with an appropriate
fitting (not supplied) and turn on the
water supplies to check for leaks.
1.14 Attach the Building-in Shroud to the
unit using the two Shroud Screws
removed earlier.
1.15 Using the Building-in Shroud as a
guide, finish the wall, e.g. tiles.
Caution! Make sure that the finished
wall is within the maximum and
minimum limits and to an even depth
(no greater than 2 mm variation) or
the control components will not fit
correctly.
1.16 Remove the two Shroud Screws
(retain for later use) and remove the
Building-in Shroud.
1.17 Fit the Concealing Plate and Control
Assembly. Refer to section: “Control
Assembly” for further details.
Finished Wall F9802
Min
Max
Minimum Finished
Wall Surface
Maximum Finished
Wall Surface
Finished Wall
Surface
20 to 22 mm 20 to 22 mm
Solid or
Dry-lined
wall
Laminated Panel
or Stud Partition
wall
Backnut
(not supplied)