Kohler Electric Shower User manual

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THESEINSTRUCTIONSARETOBELEFTWITHTHEUSER
ELECTRIC SHOWER
Installation & User Guide

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Contents
Introduction.......................................................................................................... 3
Important Safety Information .............................................................................4
Pack Contents Checklist......................................................................................7
Specifications ...................................................................................................... 8
Dimensions ....................................................................................................... 8
Wiring Diagram .................................................................................................. 9
Installation Requirements................................................................................. 11
Installation ......................................................................................................... 16
Commissioning .................................................................................................. 21
Operation ........................................................................................................... 22
Fault Diagnosis .................................................................................................. 25
Customer Fault Diagnosis ............................................................................... 25
Installer Fault Diagnosis .................................................................................. 27
Maintenance ...................................................................................................... 30
Cleaning the Inlet Filter ................................................................................... 30
Relief Valve Assembly and Resetting .............................................................. 32
Flow Regulator Assembly/Switch Assembly Removal & Installation ............... 33
Heater Tank-Removal and Installation ............................................................. 36
Thermal Trip-Removal and Installation ............................................................. 39
Spare Parts ........................................................................................................ 40
Guarantee, Customer Care policy, and How to contact us ............................ 44

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Introduction
Thank you for purchasing a quality Mira Zest Shower. To enjoy the full potential of your
new shower, please take time to read this guide thoroughly, and keep it handy for future
reference.
Mira Zest electric showers have separate controls for power selection and for
temperature/flow adjustment. A unique flow regulator stabilises any temperature
changes caused by water pressure fluctuations, which can result from taps being
turned on or off or toilets being flushed.
Products covered by this guide:
Mira Zest 7.5 – An 7.5 kW 240 V AC (6.9 kW 230 V AC) heater. Available in a white
finish.
Mira Zest 8.5 – An 8.5 kW 240 V AC (7.8 kW 230 V AC) heater. Available in a white
finish.
If you experience any difficulty with the installation or operation of your new
shower control, please refer to the FaultDiagnosissection before contacting
Kohler Mira. Our telephone and fax numbers can be found on the back cover
of this guide.
Recommended Usage
Domestic
Light Commercial
Heavy Commercial
Healthcare
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Important Safety Information
WARNING!
1. Products manufactured by us are safe and risk-free, provided that they are
installed, used and maintained in good working order, in accordance with our
instructions and recommendations.
2. THIS APPLIANCE MUST BE EARTHED.
3. In accordance with ‘The Plugs and Sockets etc. (Safety) Regulations’ in force
at the time of installation, this appliance is intended to be permanently
connected to the fixed electrical wiring of the mains system.
4. DO NOT twist the individual cable cores of the live and neutral conductors, as
this will prevent them from entering the terminal block.
5. Make sure that any pipework that could become frozen is properly insulated.
6. DONOToperate this appliance if it is frozen. Allow the appliance to thaw before
using. The shower unit must not be fitted where it may be exposed to freezing
conditions.
7. DONOTfit any form of outlet flow control as the outlet acts as a vent for the tank
body. Only Mira Showers recommended outlet fittings should be used.
8. If water leaks from the pressure relief valve, maintenance will be required
before the appliance can be safely used.
9. There are no user-serviceable components beneath the cover of the appliance.
Only a competent tradesperson should remove the cover.
10. If any of the following conditions occur, isolate the electricity and water supplies
and refer to To contact us, on the back page of this guide.
•The cover is not correctly fitted and water has entered the appliance case.
•The case is damaged.
•The appliance begins to make an odd noise, smell or smoke.
•The appliance shows signs of a distinct change in performance, indicating
a need for maintenance.
•The appliance is frozen.
11. Isolate the electrical and water supply before removing the cover.
12. Mains connections are exposed when the cover is removed.
13. Refer to the wiring diagram before making any electrical connections.
14. Ensure all electrical connections are tight, to prevent overheating.
15. This product is not suitable for areas with very high humidity (i.e steam rooms).
Please consult your installer.

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CAUTION!
1. Read all of these instructions and retain this guide for later use.
2. Pass on this guide in the event of change of ownership of the installation site.
3. Follow all warnings, cautions and instructions contained in this guide, and on or
inside the appliance.
4. The electrical installation must comply with the “Requirements for Electrical
Installations” (commonly referred to as the IEE Wiring Regulations), or any
particular regulations and practices, specified by the local electricity supply
company in force at the time of installation. The installation should be carried out
by an electrician or contractor who is registered, or is a member of, an
association such as:
•National Inspection Council for Electrical Installation and Contracting
(NICEIC), throughout the UK.
•The Electrical Contractors Association (ECA), England and Wales.
•The Electrical Contractors Association of Scotland (ECAS).
5. This is a high power unit; it is essential to contact your electricity supply
company to ensure that the electricity supply is adequate for the purpose.
6. The plumbing installation must comply with the requirements of UK Water
Regulations/Bye-laws (Scotland), Building Regulations or any particular
regulations and practices, specified by the local water company or water
undertakers. The installation should be carried out by a plumber or contractor
who is registered, or is a member of, an association such as:
•Institute of Plumbing (IOP), throughout the UK.
•National Association of Plumbing, Heating and Mechanical Services
Contractors (NAPH & MSC), England and Wales.
•Scottish and Northern Ireland Plumbing Employers’ Federation (SNIPEF),
Scotland and Northern Ireland.
7. This appliance is not thermostatic and can produce scalding temperatures if not
operated in accordance with the instructions given in this manual.
8. 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
•the disabled
•anyone who suffers from a medical condition that can result in temporary
incapacity (e.g. epilepsy or blackouts).
•anyone inexperienced in the correct operation of the controls.

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9. When this appliance 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 Checklist
Tick the appropriate boxes to familiarise yourself with the part names and to
confirm that the parts are included.
3 x Wall Plugs
3 x Fixing Screws
1 x Mira Zest Electric Shower
Documentation
1 x Installation & User Guide
1 x Installation Template
1 x Guarantee Brochure

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Specifications
Dimensions
205mm 103mm
53mm
310mm

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WiringDiagram

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Plumbing
1. Minimum maintained inlet pressure for satisfactory operation: 0.7 bar
2. Maximum static inlet pressure: 10 bar
3. Minimum static pressure to keep the flow valve closed: 0.5 bar
Electrical
1. The appliance requires a 40 Amp fuse.
2. The terminal block will not accept cable larger than 10 mm2.
StandardsandApprovals
1. This Mira Zest shower complies with all the relevant directives for CE marking.
FlowRateGraph
1. These curves are for the specified outputs at 240 V.
2. All appliance heating elements have a manufacturing tolerance. Flow rates may
be above or below those shown on the flow rate graph.
3. The left-hand axis shows temperature rise.
Temperature rise = (Showering temperature) - (Supply water temperature)
Example:For the Mira Zest 8.5 kW on full power setting with an incoming water supply
at 10°C and a showering temperature at 42°C, the temperature rise is 32°C. The flow
rate is therefore, 4 l/min.
Flow Rate (l/min)
Temperature Rise (°C)
7.5 kW
8.5 kW