Mira Select Flex User manual

1
MIRA SELECT FLEX
INSTALLATION AND USER GUIDE
THERMOSTATIC MIXER
These instructions must be left with the user.

2
INTRODUCTION
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 Flex is a thermostatic mixer with
separate ow and temperature controls. The lever
controlshavebeendesignedtobeeasilyoperated
by users with restricted hand movement.
The thermostatic mixer incorporates a wax
capsuletemperaturesensingunit,whichprovides
an almost immediate response to changes of
temperature of the incoming water supplies to
maintain the selected showering temperature.
Anadjustabletemperaturestopisprovidedwhich
limits the maximum temperature to a safe level.
Inlet lters are tted to protect the thermostatic
cartridge.
On exposed models the thermostatic mixer
has adjustable inlets to fit pipework centres
between 139 mm and 153 mm and is designed
for connection to rising, falling or rear entry
pipework.
The Mira Select Flex has been certied for use
in UK Healthcare premises as a Type 3 valve
under the BUILDCERT TMV3 scheme. The Mira
Select Flex has also been certied as a Type
2 valve under the BUILDCERT TMV2 scheme.
For Healthcare* installations refer to section:
‘Type 2 and Type 3 Valves’. This product also
complies with the Water Supply (water ttings)
Regulations 1999.
*Healthcare applications are hospitals, aged
person facilities, residential care homes, etc. and
any other application where the user is similarly
at risk.
If you experience any difficulty with the
installation or operation of your new
thermostatic mixer, please refer to ‘Fault
Diagnosis’,beforecontactingKohlerMiraLtd.
Our contact details can be found on the back
cover of this guide.
CONTENTS
Introduction 2
Guarantee 3
Recommended Usage 3
Patents and Design Registration 3
Safety Warnings 3
Pack Contents 4
Specications 5
Pressures 5
Temperatures 5
Thermostatic Shut-down 5
Connections 5
Flow Rates 5
Dimensions 6
Installation 7
Suitable Plumbing Systems 7
General 7
Exposed Thermostatic Mixers 8
Built-in Thermostatic Mixers 10
Control Assembly 19
Reversed Inlet Supplies 20
Operation 21
Commissioning 22
Exercising the Thermostat 22
Maximum Temperature 22
Maximum Temperature Setting 22
Type 2 and Type 3 Valves 23
Application 23
Commissioning 23
Maintenance 24
Maintenance 25
General 25
Planned Maintenance 25
Fault Diagnosis 27
Inlet Filters 28
Notes 29
Spare Parts 30
Exposed Models 30
Built-in Models 31
Customer Service Back Page

3
Guarantee
For domestic installations, Mira Showers
guaranteetheMiraSelectFlexagainstanydefect
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
guaranteetheMiraSelectFlexagainstanydefect
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 Only Valve with
Fittings
Domestic ü ü
Light Commercial ü ü
Heavy Commercial ü û
Healthcare ü û
Note! Heavy duty shower ttings are available
separately for use in Healthcare and Heavy
Commercial applications, for details contact
Customer Services.
Patents and Design Registration
Patents:
GB: 2 291 693, 2 392 225, 2 421 297
US: 7 240 850
Euro: 1 672 257 DE, FR, GB, IT, NL, SE
Patent Applications:
GB: 2 435 077, 0712546.1
US US-2006-0124758
US-2007-0221740
Euro: 03254070.0
Design Registration:
000834007/01, 000834007/02,
000578463-0006
SAFETY WARNINGS
Mirathermostaticmixersareprecisionengineered
and should give continued safe and controlled
performance, provided:
1. Theyareinstalled,commissioned,operatedand
maintainedinaccordancewithmanufacturer’s
recommendations.
2. For Type 2 and Type 3 installations, they
are only used for applications covered by
their approved designations, refer to section:
‘Type 2 and Type 3 Valves’.
3. 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 difculty understanding
oroperatingthecontrolsofanyshowershould
be attended whilst showering. Particular
consideration should be given to the young,
the elderly, the inrm or anyone inexperienced
in the correct operation of the controls.
This is particularly important in healthcare
procedures,suchassupervisedbathingwhere
patients are unable to respond immediately to
unsafe temperatures.
6. Rapid/Excessive movement of the ow and/or
temperaturecontrolsmayresultin momentary
unstable blend temperatures.
7. Care is required when adjusting flow or
temperature, make sure that the temperature
has stabilised.
8. 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.

4
PACK CONTENTS
Tick the appropriate boxes to familiarise yourself
with the part names and to conrm that the parts
are included.
q1 x Mira Select Flex Exposed Shower Control
q1 x Mira Select Flex Built-in Shower Control
(attached to the building-in shroud)
q1 x ‘O’ Key
q2 x Olives
q2 x Compression Nuts
q3 x Compression Nuts
q1 x 12 L/Min Flow Regulator
q1 x Hexagon Key, 2.5 mm
q1 x ‘O’ Key
q2 x Screws, No 8 x 1¼”
q2 x Wall Plugs
q2 x Olives
q2 x Concealing Plates
q1 x Hexagon Key, 2.5 mm
q2 x Screws, No 8 x 1 ¼”
q2 x Wall Plugs
q2 x Securing Clips
q2 x Concealing Caps
q1 x 12 L/Min Flow
Regulator
Documentation
q1 x Installation Template
q1 x Mira Select Flex Built-in Control Assembly
q2 x M5 x 40 mm Screws
q2 x Securing Brackets
q2 x Bracket Screws

5
SPECIFICATIONS
For Type 2 and Type 3 Valves, the supply
conditions specied in section: ‘Type 2 and Type
3 Valves -Application’ takeprecedenceoverthe
operating parameters which follow.
Pressures
Max Static Pressure:• 10 Bar.
Max Maintained Pressure:
• 5 Bar.
Min Maintained Pressure (Gravity System):
• 0.1 Bar (0.1 bar=1Metrehead fromcoldtank
base to showerhead outlet).
Note! For gravity fed or other low pressure
systems (0.5 bar or below) do not t the outlet
ow regulator (where applicable).
For optimum performance supplies should be
• nominally equal.
Temperatures
Factory Pre-set (Blend) Shower: • 41°C.
Optimum Thermostatic Control Range:• 35°C
to 43°C (achieved with supplies of 15°C cold,
65°C hot and nominally equal pressures).
Recommended Hot Supply:• 60°C to 65°C
Note! The mixing valve can operate at
higher temperatures for short periods without
damage, however this could detrimentally
affect thermostatic performance. For safety
and performance reasons it is recommended
that the maximum hot water temperature is
limited to 65°C.
Cold Water Range: up to• 25°C.
MinimumRecommendedDifferentialbetween• Hot Supply and Outlet Temperature: 12°C.
Thermostatic Shut-down
For safety and comfort the thermostat will• shut off the mixing valve within 2 Seconds if
either supply fails (achieved only if the blend
temperature has a minimum differential of
12°C from either supply temperature).
Connections
Inlets: 15 mm Compression.•
Outlet: ½” BSP Flat Face (Exposed models), •
15 mm Compression (Built-in models)
Standard connections are:
• hot - left, cold -
right, outlet - bottom (Exposed models),
top (Built-in models).
Flow Rates
Typical Flow Rates on Low Pressure Systems,
Mira Select Flex with Mira Select Flex Shower
Fittings:
0.2
00.4 0.60.8 1
Supply Pressure (bar)
25
20
15
10
5
0
Flow Rate (l/min)
Typical Flow Rates on High Pressure Systems
(with 12 Litre/Min ow regulator tted in shower
control outlet), Mira Select Flex with Mira Select
Flex Shower Fittings:
0.511.522.5
Supply Pressure (bar)
33.5 4
14
12
10
8
6
4
Flow Rate (l/min)

6
139 - 153
134
Ø71
35
198
214
Ø56
Ø183
114
All dimensions are in mm.
32
17
69 67-85
Dimensions

7
INSTALLATION
Suitable Plumbing Systems
Gravity Fed:
The thermostatic mixer must be fed from a cold
water cistern (usually tted in the loft space) and
a hot water cylinder (usually tted in the airing
cupboard) providing nominally equal pressures.
Mains Pressurised Instantaneous Hot Water
System (Combination Boiler):
The thermostatic mixer can be installed with
systems of this type with balanced pressures.
(Recommended Minimum Maintained Pressure:
1.0 Bar).
Unvented Mains Pressure System:
The thermostatic mixer can be installed with an
unvented, stored hot water system.
Pumped System:
The thermostatic mixer can be installed with an
inlet pump (twin impeller). The pump must be
installed in a suitable location and in accordance
with its instructions.
General
Installation must be carried out in accordance
withtheseinstructions,andmustbeconductedby
designated, qualied and competent personnel.
The installation must comply with the “Water
Supply Regulations 1999 (Water Fittings)” or any
particular regulations and practices, specied by
the local water company or water undertakers.
Note! Make sure that all site requirements
correspond to the information given in section:
‘Specications’. For Type 2 and Type 3 Valves
seealsosupplyconditions in section: ‘Type2 and
Type 3 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. ‘Full bore’ 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. Decide on a suitable position for the mixer.
The position of the mixer and the shower
ttings must provide a minimum gap of 25 mm
betweenthespill-overlevelofthe shower tray/
bath and the showerhead (refer to illustration).
This is to prevent back-siphonage. For further
information on the installation of your shower
ttings, refer to the ttings installation and
user guide.
Note! Only use shower ttings recommended
by the manufacturer or supplier.
Hose Retaining Ring
25 mm Minimum
Spill-over
Level
Important! A hose retaining ring should be
tted to prevent the showerhead from dropping
below the spillover level of the shower tray/
bath, which could lead to contamination from
back-siphonage. This hose retaining ring
shouldmeetthe majorityofuserrequirements
for shower installations with exible outlet
fittings. However, there will be occasions
when the hose retaining ring will not provide a
suitable solution. In these instances an outlet
doublecheckvalve,e.g.the Mira DCV-H, must
be tted. The inclusion of the Mira DCV-H
will increase the required supply pressure
typically by 10 kPa (0.1 bar), refer to section:
‘Accessories’.

8
Exposed Thermostatic Mixers
Installing the Thermostatic Mixer
1. The thermostatic mixer can be installed with
rear, rising or falling supply inlets. Decide
on the most appropriate method for your
installation, and if necessary, loosen the
grubscrews and rotate the inlet elbows to
suit.
Important! Make sure that the elbows are
pushed fully onto the mixer before tightening
the grubscrews, do not overtighten.
2. Use the installation template to mark the
positions of the holes for the backplate and
the pipe centres.
For rising or falling supplies the pipe positions
should be set 35 mm from the centre of pipe
to the nished wall at 153 mm centres.
Note!Allow a minimum of 150 mm either side
of the mixer to allow servicing of the hot and
cold inlet lters.
Note! The thermostatic mixer has adjustable
inlets to t existing pipework centres between
139 mm and 153 mm.
35 mm
Allow a minimum of
150 mm either side
of mixer to wall
3. For solid walls drill the holes for the backplate
with a 6 mm drill and insert the wall plugs. For
other types of wall structure alternative xings
may be required (not supplied).
6 mm Drill
Wall Plug
4. For Rear Entry Supplies Only:
a) Drill the holes for the supply pipes at
153 mm centres.
b) Recess the inlet holes Ø32 mm x 10 mm
deep to allow for the concealing plates.
Note! Depth must be sufcient to prevent
the concealing plates fouling on the
plumbing elbows.
5. Fit the supply pipework: Hot - Left, Cold
- Right. The inlet pipework should extend
13 mm from the nished wall surface.
Note! If it is not possible to install the mixer
with this pipework conguration complete the
installation then refer to section: ‘Reversed
Inlet Supplies’.
10 mm minimum
between elbow
and nished wall
surface
Ø32 mm
13 mm from nished
wall surface
Elbow
Recess Ø32 mm
x 10 mm deep
13 mm
153 mm
HOT
COLD

9
6. Remove the backplate from the mixer by
loosening the grubscrew with a 2.5 mm
hexagonal key.
7. Secure the backplate to the wall using the
screws.
Screw
Backplate
8. For Rear Entry Supplies Only:
a) Fit the concealing plates over the inlet
pipes.
Note! Apply silicone sealant to the back
face of the ange.
Apply Silicone Sealant
Concealing Plate
9. 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 and will not be covered under the
guarantee.
10.Fit the compression nuts and olives onto the
pipework.
11.Align the mixer with the pipework and fit
onto the backplate. Minor misalignment of
the pipework can be accommodated by the
inlets, which are adjustable between 139 and
153 mm centres.
Important! Make sure that the hot and cold
inletsonthemixercorrespondwiththehotand
cold inlet supplies.
12.Using a suitable tool, tighten the waterway
securing ring until it abuts the adjustable inlet
preventing outward movement.
Concealing Cap
(assembled)
Waterway
Securing Ring
Securing
Clip Concealing
Cap
13.Assemble the concealing caps and securing
clips and push into the elbow.
14.Tighten the compression nuts onto the mixer
with a suitable spanner.
Caution!Takecarenottodamagethechrome
surfaces.
15.Tighten the grubscrew to secure the mixer to
the backplate.

10
16. Fit the shower ttings, refer to your shower
fittings installation and user guide for
instructions.
Note! For high pressure systems (above
0.5 bar) make sure that the ow regulator
(supplied) is tted inside the outlet nipple (refer
to illustration).
Important! The tting of this ow regulator will
invalidateanyTMV2orTMV3compliancedue
to the minimum ow rate requirements. Do
not t the ow regulator in TMV2 and TMV3
applications.
Flow Regulator
17.Turn on the hot and cold water supplies and
check for leaks.
18.Before using the shower, refer to section:
‘Commissioning’.
Built-in Thermostatic Mixers
Solid Wall or Stud Partition Fixing
using Rear Mountings
1. Determine the route for the hot and cold
supply pipework and for the outlet pipework.
When connecting to BIV Shower Fittings it is
recommended that the outlet be positioned
above and to one side of the mixer. This is to
prevent the exible hose from obstructing the
shower controls.
2. Removethetwoshroudscrews(retainforlater
use) and remove the building-in shroud from
the mixer.
3. Determine the position of the mixer and draw
around the building-in shroud.
4. Mark the routes for the hot and cold supply
pipework (Hot - Left, Cold - Right) and for
the outlet pipework.
Note! (if applicable) The outlet elbow should
be sited above the mixer and on the right or
left, as site dictates.
Outlet Pipe BIR
Outlet Pipe BIV Outlet Pipe BIV
Cold InletHot Inlet
Thermostatic
Mixer
Alternative Pipe
Layouts

11
5. Cut away the plasterboard and/or brick work
to the required depth.
Important! This depth ‘X’ will depend on the
nished wall thickness e.g. tiles or facia board.
Refer to the table for this measurement.
For stud partitions depth ‘X’ refers to the
distance from the rear mounting e.g. timber
noggin, to the front of the wall (before tiling).
Finished Wall
Surface
Finished Wall
Thickness
Depth ‘X’
Rear Mounting (Solid
Wall or Timber Noggin)
Finished Wall Thickness
(e.g. tile and adhesive) Wall Cutout Depth ‘X’
4 mm 81 - 63 mm
6 mm 79 - 61 mm
8 mm 77 - 59 mm
10 mm 75 - 57 mm
12 mm 73 - 55 mm
14 mm 71 - 55 mm
16 mm 69 - 55 mm
18 mm 67 - 55 mm
20 mm 65 - 55 mm
22 mm 63 - 55 mm
24 mm 61 - 55 mm
6. Ret the building-in shroud to the mixer using
the two shroud screws removed earlier.
7. Make sure that the mixer is level and central
in the hole, and square to the nished wall
surface (or the control components will not t
correctly), then mark the positions of two xing
screw holes on the wall.
8. Forsolidwallsdrilltwo6 mm holes for the wall
plugs.
9. Fit the hot and cold supply pipework (Hot -
Left, Cold - Right).
10.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 and will not be covered under the
guarantee.

12
11.Insert the wall plugs and attach the mixer to
the wall with the screws provided.
Note!Forstudpartitioninstallationsalternative
xings may be required (not supplied) to x the
mixer to the rear face of the wall cavity or to a
timber noggin.
Screws
Outlet Pipe to
Fittings
Hot Supply
Cold Supply
12.Removethetwoshroudscrews(retainforlater
use) and remove the building-in shroud from
the mixer.
13. Make sure that the olives are tted, connect
the hot and cold supply pipes and tighten the
compression nuts.
14.Connect the outlet pipework and install the
RAC assembly or BIR assembly, before
continuing with the installation of the mixing
valve.
RAC assembly, go to section: ‘Installation,
RAC Assembly’.
BIR assembly, refer to your shower ttings
installation and user guide then continue with
instruction 15.
15.Turn on the water supplies and check for
leaks.
16. Ret the building-in shroud to the mixer using
the two shroud screws removed earlier.
17.Using the ‘Finished Wall Indicator’ on the
building-in shroud as a guide, nish the wall,
e.g. tiles.
Caution! Make sure that the nished 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
t correctly.
FinishedWall F9802
Min
Max
Minimum
nished wall
surface
Maximum
nished wall
surface
18.Removethetwoshroudscrews(retainforlater
use) and remove the building-in shroud.
19.Fittheconcealing plate and control assembly,
refer to section: ‘Control Assembly’.

13
M5 x 40 mm
Fixing Screws
9. Make sure that the olives are tted, connect
the hot and cold supply pipes and tighten the
compression nuts.
10.Connect the outlet pipework and install the
RAC assembly or BIR assembly, before
continuing with the installation of the mixing
valve.
RAC assembly, go to section: ‘Installation,
RAC Assembly’.
BIR assembly, refer to your shower ttings
installation and user guide then continue with
instruction 11.
Hot Supply
Cold Supply
Outlet Pipe
to Fittings
11.Turn on the water supplies and check for
leaks.
12.Fit the concealing plate and control assembly,
refer to section: ‘Control Assembly’.
Panel Fixing using Securing
Brackets
Note! For laminated panels the mixer must be
positioned from the rear of the panel.
Panel thickness must be between 4 and 12 mm
(if a thicker panel is used, it will be necessary
to recess the securing brackets into the rear of
the panel).
Important! Make sure that there is a minimum
clearance of 64 mm behind the laminated panel
to house the mixer.
1. Refertosection: ‘RearFixingintoSolidWalls
or Stud Partitions’ and follow instructions
1 to 4.
2. Carefully cut out the laminated panel.
3. Fit the securing brackets to the mixer.
Important! Make sure that the correct holes
are used, otherwise the backplate cannot be
tted.
4. Position the mixer on the front of the panel,
make sure that it is level and central in the
hole, then mark the position of the M5 xing
holes.
Important! Make sure that the correct holes
are used (refer to illustration).
Backplate
Securing Holes
M5 Fixing Hole
5. Drill the two 5.5 mm holes for the fixing
positions (countersink the holes at the front).
6. Fit the hot and cold supply pipework (Hot -
Left, Cold - Right).
7. 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 and will not be covered under the
guarantee.
8. Secure the mixer with the M5 x 40 screws as
shown.

14
Solid Wall or Stud Partition Fixing
using Securing Brackets
1. Refertosection:‘Rear FixingintoSolidWalls
or Stud Partitions’ and follow instructions
1 to 4.
2. Removetheplasterboardand/orbrickworkto
a minimum depth of 62 mm.
62 mm Min
24 mm Max
Finished Wall
4 mm Min
Finished Wall
Finished Wall
Surface
Securing
Bracket
3. 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.
Backplate
Securing Holes Countersunk
Fixing Hole
4. Makesurethatthemixeris level and mark the
positions for the countersunk xing holes on
the wall.
5. Forsolidwallsdrilltwo 6 mmholesfor thewall
plugs.
6. Fit the hot and cold supply pipework (Hot -
Left, Cold - Right).
7. 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 and will not be covered under the
guarantee.
8. Remove the wall brackets from the mixer.
9. Make sure that the olives are tted, connect
the hot and cold supply pipes and tighten the
compression nuts.
10. Ret the wall brackets to the mixer, t the wall
plugs and x the mixer to the wall with the
screws provided.
Note!Forstudpartitioninstallationsalternative
xings may be required (not supplied).
14.Connect the outlet pipework and install the
RAC assembly or BIR assembly, before
continuing with the installation of the mixing
valve.
RAC assembly, go to section: ‘Installation,
RAC Assembly’.
BIR assembly, refer to your shower ttings
installation and user guide then continue with
instruction 12.
Screws
Outlet Pipe
to Fittings
Hot Supply
Cold Supply
12.Turn on the water supplies and check for
leaks

15
13. Ret the building-in shroud to the mixer using
the two shroud screws removed earlier.
14.Using the ‘Finished Wall Indicator’ on the
building-in shroud as a guide, nish the wall,
e.g. tiles.
Caution! Make sure that the nished 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 t
correctly.
FinishedWallF9802
Min
Max
Minimum
nished wall
surface
Maximum
nished wall
surface
15.Removethetwoshroudscrews(retainforlater
use) and remove the building-in shroud.
16.Fit the concealing plate and control assembly,
refer to section: ‘Control Assembly’.

16
RAC Assembly
1. Before the RAC assembly can be tted you
must have rst installed your built-in shower
controlandhaveconnectedtheinletandoutlet
pipework.
Important! Makesurethattheoutletpipework
protrudes through a Ø25 mm hole in the wall
or stud partition by approximately 40 mm.
Note! For stud partition installations where
access to the rear of the partition is possible,
t the RAC wallplate over the outlet pipework
on the inside of the partition.
For stud partition installations where access
to the rear of the wall is not possible, follow
instructions for solid wall installations, making
sure that suitable wall xings (not supplied) are
used to secure the wallplate to the outside of
the stud partition.
40 mm
RAC Wallplate
(shown tted for rear
access stud partitions only)
Outlet Pipe to Fittings
2. Temporarily cap off the outlet pipe, turn on the
water supplies and check for leaks.
3. Determine the nished wall position (e.g. tile
thickness). Turn off the water supply, carefully
uncap the outlet pipe and cut to length, the
outlet pipe mustprotrude through the nished
wall surface by 21–23 mm.
Note!Removeanyburrsfromthepipesbefore
proceeding.
4. For solid wall installations or stud partition
installations without rear access go to
instruction 11.
For stud partition installations with access
to the rear of the partition continue with
instruction 5.
5. Secure the building-in shroud to the mixing
valve using the two building-in shroud screws
removed earlier.
6. Using the building-in shroud as a guide, nish
the wall, e.g. tiles.
Caution! Make sure that the nished 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 t
correctly.
FinishedWallF9802
Min
Max
Minimum
nished wall
surface
Maximum
nished wall
surface
7. Remove the two building-in shroud screws
(retain for later use) and remove the building-in
shroud.
8. Place the RAC backplate over the outlet pipe
with the arrow pointing up. The screw holes
should be at 45° to the horizontal.

17
9. Mark the positions of the two RAC backplate
xing holes and drill two Ø5.5 mm holes.
Caution! Make sure that you do not drill into
pipework in the wall.
10.Hold the RAC wallplate in position on the
rear of the partition, insert the two backplate
screws and secure the RAC backplate to the
wallplate. Make sure that the foam seal abuts
the nished wall surface. Go to instruction
22.
RAC Backplate
Backplate
Screws
11.Loosely attach the RAC backplate to the RAC
wallplate, using the two backplate screws
provided.
12.Place the RAC backplate/wallplate assembly
over the outlet pipe with the arrow pointing
vertically up. The screw holes should be at
40° to the horizontal.
13.Mark the positions of the two RAC wallplate
xing holes.
Wallplate
RAC Backplate
Backplate Screws
Arrow
40°
14.Remove the assembly from the wall and
separate the backplate from the wallplate.
15.For solid walls drill two Ø6 mm holes for the
wall plugs. For other types of wall structure
alternative fixings may be required (not
supplied). If necessary, make a recess 6 mm
deep to accept the wallplate for ush tting of
the outlet to the wall surface.
Caution! Make sure that you do not drill into
pipework in the wall.
16.Fit the two wall plugs supplied and secure
the wallplate to the wall with the two wallplate
screws.
17.Make sure that there is clearance behind the
wallplate and temporarily t the two backplate
screws into the wallplate. This will prevent
the xing holes from becoming blocked with
plaster or grout.
18.Secure the building-in shroud to the mixing
valve using the two shroud screws removed
earlier.
19. Using the building-in shroud as a guide, nish
the wall, e.g. tiles.
Caution! Make sure that the nished 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 t
correctly.
FinishedWallF9802
Min
Max
Minimum
nished wall
surface
Maximum
nished wall
surface
20.Remove the two backplate screws, the two
building-in shroud screws (retain for later use)
and the building-in shroud.
21.Place the backplate over the outlet pipe with
thearrowpointingvertically up andtightenthe
twobackplatescrews.Makesurethatthefoam
seal abuts the nished wall surface.

18
RAC Backplate
Backplate
Screws
22.Check that the blue ‘O’ seal is tted inside the
backplate nut. Fit the olive and the backplate
nut over the outlet pipe and tighten the nut.
23.Check that the second ‘O’ seal (black) is tted
to the outside of the backplate nut. Press
the elbow onto the backplate, make sure
that the clips on the elbow engage with the
backplate.
24.Press the shroud over the elbow, make
sure that it engages with the lugs on the
backplate.
Backplate Nut
Olive
Elbow
Shroud
25.This completes the installation of the RAC
assembly, fit the concealing plate and
control assembly. Refer to section: ‘Control
Assembly’.

19
Control Assembly
1. Unscrew the grubscrew and pull off the
temperature control knob, bearing and ow
control lever.
2. Carefully unclip the concealing plate from the
backplate.
Note! Useascrewdriverinthecutout toassist
separation.
Backplate
Flow Control
Lever
Temperature
Control Knob
Concealing Plate
Bearing
Cutout
3. Attach the backplate using the two shroud
screws removed earlier. Tighten the screws
until the foam seal is compressed against the
nished wall. Do not overtighten.
4. With the cutout at the bottom, locate the
concealing plate over the mixer, engage the
crossesintheconcealingplatewiththesquare
recesses in the backplate, and push rmly until
the concealing plate clicks into position.
5. Locate the ow control lever over the control
assembly and push rmly into place.
6. Fit the bearing onto the ow lever.
Note! Alignthebearingwiththecutoutsonthe
control assembly.
Flow Control
Lever
Bearing
7. Fit the shower ttings, refer to your shower
ttings installation and user guide.
Note! For high pressure systems (above
0.5 bar) make sure that the ow regulator
(supplied) is tted under the hose washer
(refer to illustration).
Important! The tting of this ow regulator will
invalidateanyTMV2orTMV3compliancedue
to the minimum ow rate requirements. Do
not t the ow regulator in TMV2 and TMV3
applications.
Flow Regulator
Hose Washer
8. Turn on the hot and cold water supplies and
check for leaks.
9. Before using the shower, refer to section:
‘Commissioning’.

20
REVERSED INLET SUPPLIES
The Mira Select Flex thermostatic mixer is
supplied with inlet connections Hot - Left, Cold
- Right and Outlet - Bottom (exposed models),
Outlet - Top (built-in models) as standard. If
the hot and cold water supply pipes have been
reversed during installation, the thermostatic
cartridge must be removed and rotated 180°.
Exposed Models
1. Isolate the hot and cold water supplies and
operate the flow control lever to relieve
pressure and drain any residual water.
2. Unscrew the grubscrew with a 2.5 mm
hexagonal key and pull off the temperature
control and ow control levers.
3. Pull off the bearing.
4. Rotate the white section of the control lever
interface 90° clockwise and pull off.
5. Pull off the ow lever adaptor.
Bearing
Temperature
Control Lever
Flow Control
Lever
Flow Lever
Adaptor
Control Lever
Interface
6. Locate the ‘O’ key (supplied) onto the cartridge
nut and turn anticlockwise. Unscrew fully and
pull the cartridge from the mixer body.
7. Rotate the cartridge 180°.
‘O’ Key
Cartridge Seal
8. Make sure that the two inlet seals are tted
and carefully push the cartridge back into the
mixer body, aligning the lugs into the slots.
Note! Check that the cartridge lug stamped
‘H’ is aligned with the hot inlet supply.
Important! Take care when fitting the
cartridge. Damage to the cartridge inlet seals
may result in dripping from the showerhead.
9. Tighten the nut by turning the ‘O’ key
clockwise.
10.Refit the controls in reverse order.
Before using the shower, refer to section:
‘Commissioning’.
Built-in Models
1. Isolate the hot and cold water supplies and
operate the flow control lever to relieve
pressure and drain any residual water.
2. Unscrew the grubscrew and pull off the
temperature control lever, bearing and ow
control lever.
3. Carefully unclip the concealing plate from the
backplate.
Note! Useascrewdriverinthecutout toassist
separation.
Backplate
Flow Control
Lever
Temperature
Control Knob
Concealing Plate
Bearing
Cutout