Mira Excel Operation manual

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These instructions are to be left with the user
Installation & User Guide
MIRA EXCEL
SHOWER CONTROL

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CONTENTS
Introduction ............................................................................................. 3
Important Safety Information ................................................................. 4
Pack Contents Checklist ......................................................................... 5
Dimensions ............................................................................................. 7
Specifications .......................................................................................... 8
1. Pressure Ranges ............................................................................. 8
2. Temperature Control ........................................................................ 8
3. Standards and Approvals ................................................................. 8
4. Flow Rates ....................................................................................... 9
Installation Requirements .................................................................... 10
Typical Suitable Installations ............................................................. 10
Installation ............................................................................................. 14
Excel ...................................................................................................... 14
1. Back inlet supplies (rising or falling concealed pipework) ............... 14
2. Exposed supplies (rising or falling surface pipework) .................... 17
Excel B .................................................................................................. 22
3. Solid and dry-lined walls................................................................. 22
4. Stud Partitions and Shower Enclosures (Front Face) ..................... 28
5. Laminated Panels and Shower Enclosures (Rear Face) ................. 29
Control Assembly Fitting Instructions ................................................. 31
Reversed Inlet Connections .................................................................. 32
Commissioning ..................................................................................... 34
1. Maximum temperature setting ........................................................ 34
2. Maximum Temperature Settings for Reversed Inlet Connections .. 36
3. Temperature override button - disable ............................................ 37
Operation ............................................................................................... 38
Fault Diagnosis ..................................................................................... 39
Maintenance .......................................................................................... 43
1. Cleaning ......................................................................................... 43
2. Cartridge assembly - renewal ......................................................... 43
3. Cartridge assembly 'O' seals/inlet strainers - renewal ..................... 43
Spare Parts ............................................................................................ 44
Customer Service .................................................................... Back Page

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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 Excel is a thermostatic shower control with independent selection of spray
force and temperature. The shower control incorporates a wax capsule temperature
sensing unit. This 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
the desired level. An override button allows the user to exceed the preset maximum
temperature. The flow control utilizes ceramic plate technology operating directly on
the hot and cold inlets to provide precise control and isolation of the incoming water
supplies. Inlet filters are fitted to protect the thermostatic control mechanism.
The Mira Excel (Exposed Version) has adjustable inlets to fit pipework centres between
150 mm and 155 mm.
Shower controls covered by this guide:
Mira Excel
An exposed shower control for connection to wall mounted or rear entry pipework.
Mira Excel B
A built-in shower control for connection to concealed pipework.
INTRODUCTION
If you experience any difficulty with the installation or operation of your new shower
control, then please refer to "Fault Diagnosis", before contacting Kohler Mira Limited.
Our telephone and fax numbers can be found on the back cover of this guide.

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IMPORTANT SAFETY INFORMATION
Warning!
1. Products manufactured by us are safe and without risk provided they are installed,
used and maintained in good working order in accordance with our instructions
and recommendations.
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 difficulty understanding or operating the controls of any
shower should be attended whilst showering. Particular consideration should be
given to the young, the elderly, the infirm, or anyone inexperienced in the correct
operation of the controls.
6. When this product has reached the end of its serviceable life, it should be disposed
of in a safe manner, in accordance with current local authority recycling, or waste
disposal policy.

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9
PACK CONTENTS CHECKLIST


Tick the appropriate boxes to familiarize yourself with the part names and to
confirm that the parts are included.
Excel shower control
Documentation
1 x Installation and User Guide 
1 x Customer Support Brochure 
1 x Installation Template 
1 x Excel 
1 x O-Key 
2 x Compression Nuts 
2 x Olives 
2 x Pipe Concealing Plates 2 x Wall Plugs 
2 x No. 8 x 3/4" Screws 

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Excel B shower control
Documentation
1 x Installation and User Guide 
1 x Customer Support Brochure 
1 x Installation Template 
1 x Concealing
Plate Assembly 
1 x Excel B 
(with building-in shroud)
1 x Shroud 
1 x Knob Assembly 
2 x No.8 x 1 1/4" Screws 
4 x M5 x 50 mm Screws (2 fitted) 
2 x M4 x 30 mm Screws 
2 x Wall Plugs 
3 x Compression Nuts 
3 x olives 

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DIMENSIONS
Excel
NOTE:- NOT TO SCALE - All dimensions are nominal and in millimetres
Excel B
134 208
150 - 155
100
38
22
61 - 78
151
155
155
208

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SPECIFICATIONS
1. Pressure Ranges
Excel & Excel B
1.1. Minimum maintained pressure: 0.1 bar (1.0 metre head) when used with Mira
shower fittings.
1.2. Maximum maintained pressure: 5.0 bar.
1.3. Maximum static pressure: 10 bar.
Note! Nominally equal inlet supply pressures are recommended for optimum
performance.
2. Temperature Control
2.1. Close temperature control is provided between 35 °C and 45 °C.
Note! The temperature control specification, outlined below, is achieved with the
blend set between 35 °C and 45 °C, with supply temperatures of 15 °C cold and
65 °C hot, AND, nominally equal inlet supply pressures.
2.2. The blended temperature is maintained within 2 °C with a 10 °C change in the hot
or cold supply.
2.3. The wax capsule sensor effects a shut down to seepage in approximately
2 seconds if the cold supply fails. Shut down to seepage is only achieved if the
hot supply is 12 °C above the blend temperature.
3. Standards and Approvals
3.1. Designed to comply with BS EN 1111 and 1287 for thermostatic mixing valves,
and to be used within systems designed to BS6700.
3.2. BS 6700 recommends that the temperature of stored water should never exceed
65 °C. A stored water temperature of 60 °C is considered sufficient to meet all
normal requirements and will minimise the deposition of scale in hard water areas.

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4. Flow Rates
Note! Pressure conversion: 1 bar = 10 m head of water = 100 kPa
'%156#46
56#46
5116*'
(14%'
EXCEL WITH LOGIC FITTINGS LOW CAPACITY SPRAY PLATE
'%156#46
56#46
5116*'
(14%'
EXCEL WITH LOGIC FITTINGS HIGH CAPACITY SPRAY PLATE
0
012345
Pressure Loss (Bar)
Flow Rate (L/Min)
10
20
30
40
50
0
012345
Flow Rate (L/Min)
10
20
30
40
50
Pressure Loss (Bar)

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INSTALLATION REQUIREMENTS
Typical Suitable Installations
Key to symbols appearing throughout this guide.
Read the section 'Important Safety Information' first.
Installation must be carried out in accordance with these instructions, and must be
conducted by designated, qualified and competent personnel.
1. Installations must comply with UK Water Regulations/ Bye-laws (Scotland), and
Building and Plumbing Regulations in force at the time of installation.
2. Layout and sizing of pipework must be such that when other services are used,
pressures at the shower control inlets are maintained approximately equal and
do not fall below the recommended minimum.
3. Do not install the product in a position in which service access is restricted.
4. Do not fit any form of flow control in the shower outlet, only Mira recommended
fittings should be used.
5. Do not use excessive force when making connections.
6. Do not install the product in a position where it could become frozen.
7. Supply pipes must be flushed to clear debris before connecting the shower control.
8. Conveniently situated isolating valves must be fitted for servicing purposes.
9. If the shower control is to be used with a fully modulating multipoint water heater,
fully modulating combination boiler, thermal store or unvented system an
expansion vessel must be fitted to accommodate the expansion of water in the
domestic hot water supply (this may already be part of the system, check the
details on the boiler/heater or contact the boiler/heater manufacturer).
Float operated valve
Stop or servicing valve
Shower control
Warning or overflow pipe
Drop tight pressure reducing valve
(PRV)
Twin impeller inlet pump
Tempering valve
Mini expansion vessel
Non-return valve