Mira Element SLT User manual

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

2
CONTENTS
Introduction 2
Guarantee 3
Recommended Usage 3
Patents and Design Registration 3
Safety : Warnings 3
Pack Contents 4
Exposed Thermostatic Mixer 4
Built-in Thermostatic Mixer 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 Mixer 8
Built-in Thermostatic Mixer 10
Solid Wall or Stud Partition
Fixing using Rear Mountings 10
Panel Fixing using Securing
Brackets 12
Solid Wall or Stud Partition
Fixing using Securing Brackets 13
RAC Assembly 15
Reversed Inlet Supplies 16
Operation 18
Commissioning 18
Maximum Temperature Setting 18
Type 2 Valves 19
Fault Diagnosis 20
Maintenance 21
Spare Parts 23
Exposed Thermostatic Mixer 23
Built-in Thermostatic Mixer 24
RAC Assembly 25
Accessories 26
Notes 27
Customer Service Back Page
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 Element SLT thermostatic mixer is a
thermostatic shower control with a single lever
for on/off and temperature control. A Mid Flow
Overide feature allows up to 30% reduction in
ow at low pressures and a Temperature Overide
warns when moving into a hotter temperature
zone.
A 14 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 lters are tted to protect the thermostatic
cartridge.
Mira Element SLT Exposed: Thermostatic
Mixer for connection to rising, falling or rear entry
pipework, supplied with L14A shower ttings.
Mira Element SLT Built-in: Thermostatic Mixer
for connection to concealed pipework, supplied
with L14D BIV shower ttings or BIR showerhead
arm and deluge head.
These products have been certied as Type 2
valves under the BUILDCERT TMV2 scheme.
They also comply with the Water Supply (water
ttings) Regulations 1999.
If you experience any difficulty with the
installation or operation of your new
thermostatic mixer, please refer to ‘Fault
Diagnosis’, before contacting Mira Showers.
Our contact details can be found on the back
cover of this guide.

3
Guarantee
For domestic installations, Mira Showers
guarantee the Mira Element SLT 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 SLT 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 ü
Light Commercial ü
Heavy Commercial û
Healthcare û
Patents and Design Registration
Patents:
GB: 2 291 693, 2 392 225, 2 421 297,
2 422 886
Euro: 1 672 257 DE FR GB IT NL SE
USA: 7 240 850
Patent Applications:
GB: 0621637.8, 2 456 271
Euro: 07015846.4
USA: 2006-0124758-A1, 2007-0221740-A1
World: WD 2008/053207
Design Registration:
000555768-0006, 000555768-0007
SAFETY : WARNINGS
Mira thermostatic mixers are precision engineered
and should give continued safe and controlled
performance, provided:
1. They are installed, commissioned, operated and
maintained in accordance with manufacturer’s
recommendations.
2. Type 2 Valves are only used for applications
covered by their approved designations, refer
to section: ‘Type 2 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
or operating the controls of any shower should
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.
6. Rapid/Excessive movement of the ow
and / or temperature control levers may result
in 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 all of the
parts are included.
Exposed Thermostatic Mixer
q1 x Thermostatic Mixing Valve
q2 x Concealing Plates
q2 x Compression Nuts
q3 x Compression Nuts
q3 x Olives
q2 x Olives
q2 x Wall Plugs
q6 x Wall Plugs
q2 x Fixing Screws
q6 x Fixing Screws
q1 x 2.5 mm Hexagonal Key
q1 x 2.5 mm Hexagonal Key
q1 x Multi Tool
q1 x Multi Tool
q1 x 14 L/Min Flow Regulator
q1 x 14 L/Min Flow Regulator
q2 x Securing Brackets
q4 x Bracket Securing Screws
q2 x M5 x 40 mm
Securing Screws
q1 x RAC Assembly
(BIV models only)
Not Illustrated
Documentation
q1 x Guarantee Registration Document
q1 x Installation Template
Built-in Thermostatic Mixer
q1 x Thermostatic Mixing Valve
(attached to the building-in shroud)
q1 x Control Assembly
Documentation
q1 x Guarantee Registration Document
q1 x M4 x 8 mm
Hexagonal Screw

5
SPECIFICATIONS
For Type 2 Valves, the supply conditions specied
in section: ‘Type 2 Valves - Application’ take
precedence over the 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 = 1 Metre head from cold
tank 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.
• For optimum performance supplies should
be nominally equal.
Temperatures
• Factory Pre-set (Blend) Shower: 41°C.
• Note! Due to variations in site conditions
the maximum temperature may need
adjustment.
• Temperature Overide set at 5°Cbelow Factory
Preset.
• 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.
• Minimum Recommended Differential between
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 / 15 mm
Compression
• Standard connections are: hot - left, cold -
right, outlet - bottom (EV models), top (BIV
and BIR models).
Flow Rates
Typical ow rates on high pressure systems (1 to
5 Bar) with 14 L/Min ow regulator tted - Mira
Element SLT with L14A Shower Fittings.
Typical ow rates on low pressure systems
(0.1 to 1 Bar) without ow regulator tted - Mira
Element SLT with L14A Shower Fittings
0.511.522.5
Supply Pressure (bar)
33.5 4 4.
55
14
16
12
10
8
6
4
Flow Rate (l/min)
Supply Pressure (bar)
Flow Rate (l/min)
Supply Pressure (bar)
Flow Rate (l/min)
0
25
30
20
10
15
5
0
Flow Rate (l/min)
0.
51

6
All dimensions in mm
Built-in Thermostatic Mixer
153
Ø56
116
142
35
Ø62
Ø183
108
30
59 - 80
Building-in Depth
45 - 56
Exposed Thermostatic Mixer
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
with these instructions, and must be conducted by
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 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. 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 showerhead (refer to illustration).
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
Soap Dish

8
Exposed Thermostatic Mixer
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.
Allow a minimum of
150 mm either side
of mixer to wall
35 mm
3. For solid walls drill the holes for the backplate
with a 6 mm diameter drill and insert the wall
plugs.
Note! For other types of wall structure
alternative fixings may be required (not
supplied).
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. For rear entry supplies the inlet
pipework should extend 18 mm from the
finished wall surface, for rising or falling
supplies the centre of the pipe should be set
35 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’.
Ø6 mm Drill
10 mm minimum
between elbow
and nished wall
surface
Ø32 mm
18 mm from nished
wall surface
Elbow
Recess Ø32 mm
x 10 mm deep
18 mm
153 mm
HOT
COLD

9
14. 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
invalidate any TMV2 low pressure compliance
due to the minimum ow rate requirements. Do
not t the ow regulator in TMV2 low pressure
applications.
15.Turn on the hot and cold water supplies and
check for leaks.
16.Before using the shower, refer to section:
‘Commissioning’.
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.
8. For Rear Entry Supplies Only:
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 t onto
the backplate.
12.Tighten the compression nuts onto the mixer
with a suitable spanner.
Caution! Take care not to damage the chrome
surfaces.
13.Tighten the grubscrew to secure the mixer to
the backplate.
Note! Make sure that the ow regulator (supplied)
is tted inside the outlet nipple in the orientation
shown.
Flow Regulator

10
Built-in Thermostatic Mixer
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 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 exible hose from obstructing the
shower controls.
2. Remove the two shroud screws then remove
the building-in shroud from the mixer.
Note! Ret the shroud screws to the mixer.
3. Determine the position of the mixer and draw
around the building-in shroud.
4. Mark the routes for the 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
tted and that the lter caps can be accessed
from the front (i.e. hexagonal key facing
forward).
Finished Wall
Surface
Finished Wall
Thickness
Depth ‘X’
Rear
Mounting
Finished Wall Thickness
(e.g. tile and adhesive)
Wall Cutout Depth
‘X’
4 mm 76 - 55 mm
6 mm 74 - 55 mm
8 mm 72 - 55 mm
10 mm 70 - 55 mm
12 mm 68 - 55 mm
14 mm 66 - 55 mm
16 mm 64 - 55 mm
18 mm 62 - 55 mm
20 mm 60 - 55 mm
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).
Outlet Pipe BIR
Outlet Pipe BIV Outlet Pipe BIV
Cold InletHot Inlet
Thermostatic
Mixer
Alternative Pipe
Layouts

11
Screws
Outlet Pipe to Fittings
Hot Supply
Cold Supply
Shroud Screw
F13125
Finished Wall
Min
Max
Minimum nished
wall surface
Maximum nished
wall surface
13.Turn on the water supplies and check for
leaks.
14. Remove the two shroud screws and ret the
building-in shroud to the mixer.
15.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.
16.Remove the building-in shroud and secure
the chrome trim to the mixer using two of the
bracket securing screws.
17.Fit the concealing plate and control assembly,
refer to section: ‘Control Assembly’.
6. 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 the xing
screw holes on the wall.
7. For solid walls drill two Ø6 mm holes for the
wall plugs.
8. Fit the hot and cold supply pipes (Hot - Left,
Cold - Right).
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.Insert the wall plugs and attach the mixer to
the wall with the screws provided.
Note! For stud partition installations alternative
xings may be required (not supplied) to x the
mixer to the rear face of the wall cavity or to a
timber noggin.
11.Make sure that the olives are tted and connect
the hot and cold supply pipes, then tighten the
compression nuts.
12.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 13.

12
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 conceal the mixer.
1. Refer to section: ‘Solid Wall or Stud Partition
Fixing using Rear Mountings’ and follow
build instructions 1 to 4.
2. Carefully cut out the laminated panel.
3. Fit the securing brackets to the mixer.
Important! The securing brackets must be
xed vertically, as illustrated.
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).
Note! Make sure that the Filter Plugs are
positioned so that they can be removed for
servicing.
5. Drill the two Ø5.5 mm holes for the xing
positions (countersink the holes at the front).
6. Fit the hot and cold supply pipes (Hot - Left,
Cold - Right)
M5 Fixing Hole
M5 Fixing Hole
Backplate
Securing Hole
Backplate
Securing Hole
Filter Plug
Hot Supply
Cold Supply
Outlet Pipe to
Fittings
M5 x 40 mm
Fixing Screws
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 mm screws
as shown.
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
build instruction 11.
11. Turn on the water supplies and check for
leaks.
12.Fit the concealing plate and control assembly,
refer to section: ‘Control Assembly’.

13
Solid Wall or Stud Partition Fixing
using Securing Brackets
1. Refer to section: ‘Solid Wall or Stud Partition
Fixing using Rear Mountings’ and follow
build instructions 1 to 4.
2. Remove the plasterboard and/or brick work to
a minimum depth of 55 mm.
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.
Note! The securing brackets can be rotated
for suitable xing points.
55 mm Min
20 mm Max
Finished Wall
4 mm Min
Finished Wall
Finished Wall
Surface
Securing
Bracket
Rotate for Suitable Fixing Point
Backplate Securing Hole
Backplate Securing Hole
Countersunk Fixing Hole
Note! Securing Brackets shown
in preferred position to allow the
Compression Nuts to be tightened.
4. Make sure that the mixer is level and mark the
positions for the countersunk xing holes on
the wall.
5. For solid walls drill two Ø6 mm holes for the
wall plugs. Caution! Do not drill into pipes in
the wall.
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. Insert the wall plugs and attach the mixer to
the wall with the screws provided.
Note! For stud partition installations alternative
xings may be required (not supplied).
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
build instruction 11.
11. Turn on the water supplies and check for
leaks.
12. Remove the two shroud screws and ret the
building-in shroud to the mixer.
Screws
Outlet Pipe to Fittings
Hot Supply
Cold Supply

14
13.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.
14.Remove the building-in shroud and secure
the chrome trim to the mixer using two of the
bracket securing screws.
15.Fit the concealing ring over the mixer and
mark the positions of the four xing holes in
the orientation illustrated. The upper screw
hole should be located horizontally above the
valve in 12 ‘o’clock position.
16.For solid walls drill four Ø6 mm holes for the
wall plugs. For other types of wall structure
alternative fixings may be required (not
supplied).
17. Insert the wall plugs and attach the concealing
ring to the wall with the screws provided.
F13125
Finished Wall
Min
Max
Minimum nished
wall surface
Maximum nished
wall surface
Control Lever
Trim
Control
Lever
Backplate
Concealing
Plate
18.Fit the concealing plate over the mixer making
sure the slot is in the 6 o’clock position then
gently push until it clips onto the concealing
ring.
19.Fit the control lever to the mixer using the M4
x 8 securing screw, use the 2.5 mm hexagonal
key (supplied) to ensure it is tightened fully.
20.Clip the control lever trim onto the control
lever.
21.Before using the shower, refer to section:
‘Commissioning’.
Screws
Backplate
Upper screw
hole must be
at 12 o’clock
position

15
Installation of the RAC Assembly
1. Before the RAC assembly can be tted you
must have rst installed your built-in shower
control and have connected the inlet and outlet
pipework.
Important! Make sure that the outlet pipework
protrudes through a Ø25 mm hole in the wall
or stud partition by at least 40 mm.
Note! For stud partition installations where
access to the rear of the partition is possible,
t the RAC wall plate 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 wall plate to the outside of
the stud partition.
40 mm
RAC Wall Plate
(shown tted for rear
access stud partitions only)
Outlet Pipe to Fittings
Mixing Valve
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 must protrude through the nished
wall surface by 21–23 mm.
Note! Remove any burrs from the pipes before
proceeding.
4. For solid wall installations or stud partition
installations without rear access go to build
instruction 9.
For stud partition installations with access to
the rear of the partition continue with build
instruction 5.
5. Finish the wall, e.g. tiles.
6. Place the RAC backplate over the outlet pipe
with the arrow pointing up. The screw holes
should be at 45° to the horizontal.
7. 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.
8. Hold the RAC wall plate in position on the
rear of the partition, insert the two backplate
screws and secure the RAC backplate to the
wall plate. Make sure that the foam seal abuts
the nished wall surface. Go to instruction build
18.
9. Loosely attach the RAC backplate to the RAC
wall plate, using the two backplate screws
provided.
10.Place the RAC backplate/wall plate assembly
over the outlet pipe with the arrow pointing
vertically up. The screw holes should be at
40° to the horizontal.
11. Mark the positions of the two RAC wall plate
xing holes.
12.Remove the assembly from the wall and
separate the backplate from the wall plate.
RAC Backplate
Backplate
Screws
Wall Plate
RAC Backplate
Backplate Screws
Arrow
40°

16
13.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 wall plate for ush tting of
the outlet to the wall surface.
14.Fit the two wall plugs supplied and secure the
wall plate with the wall plate screws.
15.Make sure that there is clearance behind the
wall plate and temporarily t the two backplate
screws into the wall plate. This will prevent
the xing holes from becoming blocked with
plaster or grout.
16.Finish the wall, e.g. tiles.
17.Place the backplate over the outlet pipe with
the arrow pointing vertically up and tighten the
two backplate screws. Make sure that the foam
seal abuts the nished wall surface.
18.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.
19.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.
20.Press the shroud over the elbow, make
sure that it engages with the lugs on the
backplate.
21.This completes the installation of the RAC
assembly.
Dome
Shroud
Chrome Trim
(Built-in models only)
Dome
Clamp
Bearing
Bracket
Securing
Screw
REVERSED INLET SUPPLIES
The Mira Element SLT thermostatic mixer is
supplied with inlet connections Hot - Left, Cold -
Right as standard. If the hot and cold water supply
pipes have been reversed during installation the
thermostatic cartridge must be removed and
rotated 180°.
1. Isolate the hot and cold water supplies and
operate the control lever to relieve pressure
and drain any residual water.
2. Use the slotted end of the multi tool (supplied)
inserted into the recess at the top of the control
lever to prise the control lever trim away.
3. Use the 2.5 mm hexagon key (supplied) to
remove the securing screw then remove the
control lever.
4. Built-in Models only:
a). Carefully unclip the chrome concealing
plate from the backplate. Note! Use the
multi tool in the cutout at the bottom of
the concealing plate to lever off.
b). Remove the two trim securing screws.
5. Use your finger or a small screwdriver to
rotate the dome clamp 90° in an anti-clockwise
direction, remove the dome clamp from the
dome shroud.
Multi Tool
Control Lever
Trim
Note! For high pressure systems (above 0.5 bar) make
sure that the ow regulator (supplied) is tted inside the
elbow in the orientation shown.
RAC Backplate
Backplate
Screws
Elbow
Shroud
Flow Regulator
Backplate Nut
Olive

17
2.5 mm
Hexagonal Key
Lever Insert
Hinge
Pin
Lever
Insert Eco Flow
Device
Swap positions.
i.e. Ret Lever
Insert where Eco
Flow Device was
originally.
Cartridge Seal
6. Remove the dome shroud, bearing and
chrome trim if tted (Built in Models only).
7. Fit the multi tool onto the cartridge nut and
turn anticlockwise. Unscrew fully and pull the
cartridge from the mixer body.
8. Use the 2.5 mm hexagonal key or a suitable
sized screw driver to push the hinge pin from
left to right, releasing the lever insert (refer to
illustration).
9. Repeat the procedure to remove the eco ow
device.
10.Rotate the cartridge 180°.
11.Ret the eco ow device in the location that
the lever insert was originally removed from,
pushing the hinge pin in from right to left.
13.Make sure that the two cartridge inlet seals
are tted and carefully push the cartridge into
the body, aligning the cartridge lugs into the
body slots.
Note! Check that the cartridge lug stamped
‘H’ is aligned with the hot inlet supply.
Important! Take care when tting the cartridge
as damage to the cartridge inlet seals may
result in dripping from the shower head.
14.Tighten the nut by turning the multi tool
clockwise.
Note! Please ensure it is tightened fully.
15.Reassemble in reverse order.
16.Before using the Shower, refer to section:
‘Commissioning’.
Lever
Insert.
Lever Insert
must re-engage
correctly.
12. Repeat the procedure to ret the lever insert
making sure that it re-engages correctly with
the cartridge.
Note! When the pin is tted correctly it will be
ush with the Lever Insert.

18
COMMISSIONING
Maximum Temperature Setting
Before using the shower the maximum temperature
must be checked to make sure that it is at a
safe level. It has been preset to approximately
41°C at the factory but due to variations in site
conditions the maximum temperature may need
adjustment.
The Temperature Overide is set at approximately
5°C below the Maximum Set Temperature.
Note! Make sure that the hot water temperature is
at least 55°C and that there is sufcient supply.
For Type 2 installations the maximum blend
temperature is determined by the application,
refer to section: ‘Type 2 Valves - Application’.
1. Turn on the shower to the maximum
temperature (i.e. fully anticlockwise) and allow
the temperature to stabilise.
If the temperature is too hot or too cold, adjust
as follows:
2. Use the slotted end of the multi tool (supplied)
to prise the control lever trim away from the
control lever.
3. Insert the 2.5 mm hexagon key (supplied)
into the recess in the centre of the cartridge
and engage with the temperature adjusting
screw.
4. Rotate the hexagon key until the required
maximum temperature is obtained at the
shower. Turn anticlockwise to increase the
temperature, or clockwise to decrease the
temperature (¼ turn = approximately 1°C).
5. Once the desired maximum blend temperature
has been achieved turn off the shower.
6. Check that the showering temperature is
correct.
7. Ret the control lever trim.
Off
Temperature Control:
Warm
On
Flow Control:
Max Set
Temp Cold
Note! Due to the inclusion of the 14 L/Min outlet
ow regulator, the reduction in ow at high
pressure will be less signicant.
Temperature Overide -
approximately 5°C below
Max Set Temperature.
Mid Flow Overide - Reduces water
ow by up to 30% (dependant on inlet
pressures) and can be overridden by
increasing ow to full.
OPERATION
The Mira Element SLT thermostatic mixer is a
thermostatic shower control with a single control
lever for ow and temperature control.
Note! You will notice a subtle ‘click’ when both
overriding the ow to full ow and the temperature
to maximum. This feature has been designed to
give subtle user feedback.
The control lever operates in the following
sequence:

19
TYPE 2 VALVES
Application
The approved designations for Type 2 Valves
are as follows:
Models Designation
Mira Element SLT LP-S, HP-S
Important! The tting of any ow regulator
will invalidate TMV2 compliance due to the
minimum ow rate requirements. Do not t
owregulatorsinTMV2applications.
Conditions of use for Type 2 Valves
Operating Pressure
Range
High
Pressure
Low
Pressure
Maximum Static
Pressure (bar) 10 10
Maintained Pressure,
Hot and Cold (bar) 0.5 to 5 0.1 to 1
Hot Supply
Temperature (°C) 55 to 65 55 to 65
Cold Supply
Temperature (°C) ≤25 ≤25
Valves operating outside these conditions cannot
be guaranteed to operate as Type 2 Valves.
Recommended Outlet Temperatures
The BuildCert TMV scheme recommends the
following set maximum mixed water outlet
temperatures for use in all premises:
44°C for bath ll, but see notes below;
41°C for showers;
41°C for washbasins;
38°C for bidets.
The mixed water temperatures must never
exceed 46°C.
The maximum mixed water temperature can be
2°C above the recommended maximum set outlet
temperatures.
Note! 46°C is the maximum mixed water
temperature from the bath tap. The maximum
temperature takes account of the allowable
temperature tolerances inherent in thermostatic
mixing valves and temperature losses in metal
baths.
It is not a safe bathing temperature for adults
or children.
The British Burns Association recommends 37
to 37.5°C as a comfortable bathing temperature
for children. In premises covered by the Care
Standards Act 2000, the maximum mixed water
outlet temperature is 43°C.
The thermostatic mixing valve will be installed in
such a position that maintenance of the TMV and
its valves and the commissioning and testing of
the TMV can be undertaken.
The tting of isolation valves is required as close
as practicable to the water supply inlets of the
thermostatic mixing valve.
Commissioning notes for Thermostatic Mixing
Valves
The rst step in commissioning a thermostatic
mixing valve is to check the following:
The designation of the thermostatic mixing valve
matches the application.
The supply pressures are within the valves
operating range.
The supply temperatures are within the valves
operating valve.
Isolating valves (and strainers preferred) are
provided.
If all of these conditions are met, proceed to
set the temperature as specified in section:
‘Commissioning’.
Important! The mixed water temperature at the
discharge point must never exceed 46°C

20
It is a requirement that all TMV2 approved
valves shall be verified against the original
set temperature results once a year. When
commissioning/testing is due the following
performance checks shall be carried out.
Measure the mixed water temperature at the
outlet.
Carry out the cold water supply isolation test by
isolating the cold water to the TMV, wait for ve
seconds if water is still owing check that the
temperature is below 46°C.
If there is no signicant change to the set outlet
temperature (±2°C or less change from the
original settings) and the fail-safe shut off is
functioning, then the valve is working correctly
and no further service work is required.
Notes! If there is a residual flow during the
commissioning of the valve or the annual
verication (cold water supply isolation test), then
this is acceptable providing the temperature of
the water seeping from the valve is no more than
2°C above the designated maximum mixed water
outlet temperature setting of the valve.
Temperature readings should be taken at the
normal ow rate after allowing for the system to
stabilise.
The sensing part of the thermometer probe
must be fully submerged in the water that is to
be tested.
Any TMV that has been adjusted or serviced must
be re-commissioned and re-tested in accordance
with the instructions given in this guide.
The installation of thermostatic mixing valves must
comply with the requirements of the Water Supply
(Water Fittings) Regulations 1999.
FAULT DIAGNOSIS
If you require a Mira trained service engineer or
agent, refer to section: ‘Customer Services’.
Fault Diagnosis
Symptom:
• Only hot or cold water from the mixer outlet.
• Outlet temperature too hot / too cold.
Cause/Rectication:
• Inlets reversed (hot supply to cold supply).
• No hot water reaching mixer.
• Check the lters for any blockage.
• Installation conditions outside operating
parameters, refer to sections: ‘Specications’
and ‘Commissioning’.
—————————————
Symptom:
• Fluctuating or reduced ow rate.
Cause/Rectication:
• Check the showerhead, hose and lters for
any blockage and clean.
• Make sure that the maintained inlet pressures
are nominally balanced and sufcient, refer to
section: ‘Specications’.
• Make sure that the inlet temperature
differentials are sufcient, refer to section:
‘Specications’.
• Flow regulator tted incorrectly.
• Air lock or partial blockage in the pipework.
—————————————
Symptom:
• Water leaking from showerhead.
Cause/Rectication:
• Normal for a short period after shut off.
• Check that the pressures are not in excess of
the specications for the product.
• Renew the thermostatic cartridge.