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.

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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

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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