Mira Miniduo User Manual
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Mira Miniduo
†
(†including Eco Models)
Thermostatic Mixers
Please leave these instructions with the user
Installation and User Guide
If you experience any difculty with the installation or operation of your new shower, then
please refer to the Fault Diagnosis section, before contacting Kohler Mira Ltd.
Our telephone and fax numbers can be found in the back of this guide.
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Application
The approved designations for Type 2 Valves are as follows:
Models Designation
Miniduo LP-S, HP-S
Important! The tting of any ow regulator to Miniduo models will invalidate TMV2 compliance
due to the minimum ow rate requirements. Do not t ow regulators in TMV2 applications to
these models.
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 Miniduo is a thermostatic mixer with separate on/off and temperature control.
The thermostatic mixers incorporate 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.
Type 2 Valves
These products have been certied as Type 2 valves under the BUILDCERT TMV2 scheme. They also
comply with the Water Supply (water ttings) Regulations 1999.
For Type 2 Valves refer to the TMV2 Requirements Manual.
Recommended Usage
Application
Valve with
Fittings
Domestic
ü
Light Commercial
ü
Heavy Commercial
û
Healthcare
û
Guarantee
For domestic installations, Mira Showers guarantee the products listed in this guide 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 products listed in this guide against any
defect in materials or workmanship for a period of one year from the date of purchase.
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SAFETY WARNINGS
1. They are 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 of these instructions and retain this guide for later use.
2. Installation must be carried out in accordance with these instructions, and must be conducted by
designated, qualied and competent personnel.
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. Make sure that you fully understand how to operate this shower before use, read all operating
instructions and retain this guide for future reference.
6. This product is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given supervision
or instruction concerning the use of the product by a person responsible for their safety.
7. Children should be supervised to ensure that they do not play with the product.
8. DO NOT perform any unspecied modications to the shower or its accessories. When servicing only
use genuine Kohler Mira replacement parts.
9. DO NOT t any form of outlet ow control. Only Mira recommended outlet ttings should be used.
10. DO NOT operate the temperature control rapidly, allow 10 – 15 seconds for the temperature to stabilise
before use.
11. Care is required when adjusting ow or temperature, make sure that the temperature has stabilised.
12. Care is required if the product is turned off and back on during showering as this may result in unstable
temperature. Ensure temperature has stabilised before re-using product.
13. Sunburn or skin conditions can increase your sensitivity to hot water. Make sure that you set the
shower to a cooler temperature.
14. The water supplies to this product must be isolated if the product is not to be used for a long period
of time. If the product or pipework is at risk of freezing during this period they should also be drained
of water.
15. 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
Warning! This product can deliver scalding temperatures if not operated, installed or maintained in
accordance with the instructions, warnings and cautions contained in this guide.
The function of a thermostatic mixing valve is to deliver water consistently at a safe temperature. In
keeping with every other mechanism, it cannot be considered as functionally infallible and as such,
cannot totally replace a supervisor’s vigilance where that is necessary.
Mira thermostatic mixers are precision engineered and should give continued safe and controlled
performance, provided:
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Component Pack
q 2 x Concealing Plates
q 2 x Compression Nuts
q 2 x Olives
q 2 x Wall Plugs
q 2 x Fixing Screws
q 1 x 2.5 mm Hexagonal Key
q 1 x ‘O’ Key
q 1 x Flow Regulator (refer to
section: ‘Flow Regulators’)
PACK CONTENTS
Exposed Thermostatic Mixers
q 1 x Thermostatic Mixing Valve
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Built-in Thermostatic Mixers
q 1 x Thermostatic Mixing Valve
Component Pack
q 3 x Compression Nuts
q 3 x Olives
q 5 x Wall Plugs
q 5 x Fixing Screws
q 1 x 2.5 mm Hexagonal Key
q 1 x Concealing Plate
Assembly
q 1 x ‘O’ Key
q 1 x Flow Regulator (refer to
section: ‘Flow Regulators’)
q 1 x RAC Assembly
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These thermostatic mixers are available with various shower ttings and water saving features, refer to
the table below to identify your mixer valve combination:
Mixer Valve
Shower
Fittings
Flow Regulator
Flow Rate Colour Comments
Miniduo EV L98D 12 L/Min Red
Supplied in the component pack, designed to be
tted in the shower valve outlet
Miniduo BIV L98D 12 L/Min Natural
Supplied in the component pack, designed to be
tted between the shower hose and RAC assembly
Miniduo with Eco
Showerhead EV
L98D with Eco
Showerhead
7.3 L/Min - Optional t for HP systems only
Miniduo with Eco
Showerhead BIV
L98D with Eco
Showerhead
7.3 L/Min - Optional t for HP systems only
Miniduo with Eco
Showerhead BIR
Eco BIR
Showerhead
6.0 L/Min - Supplied tted in the showerhead
The Mira Miniduo ECO BIR has a ow regulator supplied pre-tted in the showerhead, on older combination
boilers and for low pressure gravity fed systems the ow regulator may need to be removed to improve
the ow rate.
Flow regulators are for installation on high pressure systems (above 0.5 bar).
The Mira Miniduo ECO EV & BIV have a ow regulator supplied for installation on high pressure systems
above 2 bar. Note! On some combination boiler systems in order to achieve the minimum ow rate req’d
to ignite the boiler the ow regulator may not be req’d. For low pressure gravity fed systems do not t
the ow regulator.
Important! The tting of any ow regulator to Miniduo models will invalidate TMV2 compliance
due to the minimum ow rate requirements. Do not t ow regulators in TMV2 applications to
these models. For further information on how and where to t the ow regulator, refer to section: ‘Flow
Regulators’.
Pressures
• Max Static Pressure: 10 Bar.
• Max Maintained Pressure: 5 Bar.
• Min Maintained Pressure (Gas Water Heater): 1 Bar.
• Min Maintained Pressure (Gravity System): 0.1 Bar (0.5 Bar for models with Eco Showerhead).
(0.1 bar = 1 Metre head from cold tank base to showerhead outlet). 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.
• Minimum Recommended Differential between Hot Supply and Outlet Temperature: 12°C.
Valve Combinations
For Type 2 Valves, the supply conditions specied in the TMV2 Requirements Manual take precedence
over the operating parameters which follow.
SPECIFICATIONS
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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).
(All dimension in millimetres)
Flow Rates
Typical Flow Rates
Mira Miniduo with Mira L98D Shower Fittings (Typical Flow Rate without regulators tted)
Supply Pressure (bar)
Flow Rate (L/Min)
0
10
20
30
40
50
01 23
45
0.5 1.5 2.5 3.5 4.5
DIMENSIONS
39
17
110
Ø46
125
Ø54
95
Note! If you are retro-tting your mixing valve onto
existing pipework, an Adjustable Elbow Pack is
available if required, refer to section: ‘Accessories’.
Miniduo EV
Miniduo BIV and Miniduo with Eco Showerhead
BIV / BIR
103
56-76 53-73
21
20
Ø183
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Miniduo with Adjustable Elbows
Ø46
76.5
133
153
Pipe Centres at extremes of elbow adjustment
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).
Note! On combination boiler systems we recommend that the thermostatic mixer is operated in the
maximum ow position in order to achieve the minimum ow rate required to ignite and run the boiler.
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, qualied and competent personnel.
The installation must comply with the “Water Supply Regulations 1999 (Water Fittings)” or any particular
regulations and practices, specied by the local water company or water undertakers.
Note! Make sure that all site requirements correspond to the information given in section: ‘Specications’.
For Type 2 Valves see also supply conditions in the TMV2 Requirements Manual.
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