Kohler Mira Zest User's Manual
Contents
1. ELECTRIC SHOWER Installation amp User Guide THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER Malige lt e ils p pona EE E E 3 Important Safety Information 4 Pack Contents Checklist 1 oe ri iae ri aneit aaaea aaa aaaea 7 lente 8 DIMENSIONS M 8 Wima E 9 Installation Requirements eene 11 Installation 16 COMMISSIONING 21 22 Fault Diagnosis 25 Customer Diagnosis chere t duced ER Ex deed 25 Installer Fault Diagnosis eorura treten 27 e 30 Cleaning the Inlet Filter dieron iere nct et re rtt rt admire cogn 30 Relief Valve Assembly and 32 Flow Regulator Assembly Switch Assembly Removal Installation 33 Heater Tank Removal and Installation 36 Thermal Trip Removal and 39 Spare Parts 40 Guarantee Customer Care policy and How to contact us 44 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 f2. Electric showers work by taking in cold water and passing it over the heating elements contained in the tank inside the shower The showering temperature is adjusted by turning the temperature control knob which varies the flow of cold water across the elements The slower the rate of flow the warmer the water and vice versa The holes in the spray plate of the shower handset should always be kept clean to maintain a consistent flow and stable shower temperatures The appliance is designed to stabilise temperature changes caused by water pressure fluctuations These fluctuations can be caused by taps being turned on or off or toilets being flushed Under such conditions average shower temperatures will be held within a 6 C range provided that the minimum required pressure is maintained Seasonal changes in the temperature of the incoming cold water supply and or fluctuations in mains electrical voltage will effect the temperature of the water Adjust the temperature knob as necessary to compensate The shower requires a minimum maintained running pressure of 0 7 bar to operate At pressures above 0 7 bar the shower will minimise the temperature fluctuations caused when other draw off points are used If the flow rate drops below an acceptable level the heating element inside the shower will turn off resulting in cold shower If the water temperature reaches an unsafe level the thermal switch assembly turns off the heating element
3. Section 12 13 14 15 16 17 Secure shower to the wall loosely through the top two fixing holes using the supplied screws Mark the position of the bottom fixing hole Remove the shower from the wall Drillthe bottom fixing hole and insert the supplied wall plug Thoroughly flush the mains fed cold water supply pipe The supply must be clean and free fromdebris BEFORE connecting the appliance Replace the shower on the wall and secure through the three fixing holes using the supplied screws Connect the inlet supply pipe to the inlet connector using a 1 2 BSP nipple with compression nuts and olives shown or a push fit connector 18 Screws Inlet Connector Compression Nut Olive 1 2 BSP Nipple gt Olive Nut Inlet Supply Pipe 18 Bring the electrical cables into the case 19 Strip back sufficient of the outer cable insulation to enable routing to terminal block 20 Fitan earth sleeve to the earth wire 21 Loosenthe screws inthe terminal block and insertthe bare wires into the clamps L Live Brown wire 22 Earth Green sleeved wire N Neutral Blue wire Note Donottwistthe cores ofthe wires or strain the cables to make them reach the terminal block 22 Connect the conductors firmly into the terminal block Make sure that the bare cores of each condu
4. and Installation WARNING Isolate the electrical and water supplies before removing the cover Mains electricity connections are exposed when the cover is removed Remove the three cover retaining screws and the cover Make a note of the positions of the wiring on top of the heater tank Remove the screw that holds the green earth wire to the thermal trip Ease the thermal trip away from the heater tank PORN Thermal Trip Green Earth Wire Remove the screws that hold the red and three brown wires on the thermal trip Remove the thermal trip Caution Do not press printed disc on the thermal trip as this will make the component unserviceable 7 the components in reverse order Make sure that the electrical wires are installed in the correct positions 39 Spare Parts List 406 27 Filter 439 75 Inlet Connector Assembly 439 76 Clamp Bracket Pack components identified 439 77 Flow Reg Assembly 7 5 8 5 kW 439 79 Switch Assembly Rotary 439 81 Cover Assembly Zest 439 87 Terminal Block Assembly 439 88 Seal Pack components identified 439 89 Screw Pack components identified C 439 90 Thermal Trip Assembly 439 91 Heater Tank Assembly 7 5 kW 439 92 Heater Tank Assembly 8 5 kW 439 95 Service Tunnel 439 99 Tank Outlet and Ball 40 Spare Parts Diagram 41 42 43 Customer Service Mira Showers guarantee product
5. only be sent to competent persons Service Our Service Force is available to provide a quality service at a reasonable cost You will have the assurance of a Mira trained engineer agent genuine Mira spares anda 12 month guarantee on the repair Payment should be made directly to the Service Engineer Agent using Visa Mastercard or a cheque supported by a banker s card To contact us England Scotland amp Wales Mira Showers Customer Services Telephone 0870 241 0888 8 30 am to 5 00 pm Working days 4 30 pm Friday 8 30 am to 12 30 pm Saturday E mail technical 9 mirashowers com Fax 01242282595 By Post Cromwell Road Cheltenham Gloucester GL52 Northern Ireland Wm H Leech amp Son Ltd Telephone 028 9044 9257 Mon to Fri 9 am 5pm Fax 028 9044 9234 24 hours Post Maryland Industrial Estate Ballygowan Road Moneyreagh Co Down BT236BL Republic of Ireland Modern Plant Ltd Telephone DublinO14591344 Monto Fri 9amto 5pm Fax Dublin 01 4592329 24 hours Post Otter House Naas Road Clondalkin Dublin 22 mira SHOWERS BS EN ISO 9001 1994 Reg No FM 14648 Kohler Mira Limited November 2003
6. the stop isolating valve completely Clear the blockage or replace the hose or handset Contact the local water authority Replace the heater tank Replace the flow regulator assembly Clean the inlet filter See the Maintenance Cleaning the Inlet Filter section Switch on the power at the double pole switch Renew the fuse or reset the MCB RCD If the fault persists contact Customer Services Replace the heater tank Water leaks from the bottom of the case near the outlet and there is no flow from the handset The water can not be turned off The pressure relief valve in the tank has been triggered the shower has a pressure relief valve assembly that works to reduce the damage if the outlet is blocked or the unit is frozen When the relief valve operates a small rubber ball is ejected The pilot valve is faulty Broken diaphragm The supply pressure is below the minimum requirement 29 Resolve the blocked outlet and replace the tank assembly Reset the relief valve assembly refer to Maintenance Relief Valve Setting If the fault persists contact Customer Services Replace the flow regulator assembly Replace the flow regulator assembly Contact the local water authority Check the static water pressure Note that the static pressure may fall below minimum requirement when other appliances are drawing water for example the dishwasher or washing machin
7. Putthe installation template on the wall and mark the positions of the top two fixing holes Ensure thatthere are sufficient lengths of supply pipe and electrical cable to reach the connection points as shown on the template 3 Remove the installation template and drill the top two fixing holes Insert the supplied wall plugs CAUTION Do not drill into cables or pipes in the wall 4 Thoroughly flush the supply pipe 5 Onthe shower turn both knobs to the full anti clockwise position 6 Remove the three screws that hold the cover on the shower and remove the cover 7 Remove the service tunnel from the shower Screws Shower Cover Screw Service Tunnel 10 11 Determine the direction of the incoming water supply falling entering the shower from the top or rising entering the shower from the bottom Do not use an incoming supply entering the shower directly from the back Add an elbow to the supply pipe and connect it as a rising or falling supply Rotate the inlet connectorto suitthe direction of the incoming water supply The case has thinned sections that can be removedto allow entry ofthe supply pipe and electrical cables Remove the top thinned section of the case for a falling supply or remove the bottom thinned section of the service tunnel for a rising supply Do not remove any case if the electrical cables enterfromthe back 17 Thinned Section Service Tunnel Thinned
8. ach the handset Note It is normal for the flow rate to change when the temperature is changed Note Ifthe water temperature cycles between hot and cold the temperature is set too high This is causing the thermal switch to turn off the heating element to reduce the water temperature Turn the temperature knob anticlockwise to reduce the water temperature 23 Stop Cooler Medium Low 2 High Hotter turn the shower off 1 the power knob to Stop Low Medium Note A small amount of water may continue to flow from the handset for a few moments SS 2 Switch off the electrical supply atthe double pole switch Low Medium Stop Hi S Low Medium Stop igh S Low Medium Stop High Hn x 7 24 Fault Diagnosis Customer Fault Diagnosis The troubleshooting information below gives details on what you can do as auser if you encounter problems with the shower If this information does not fix the problem contact the installer for advice Read the Important Safety Information section first and refer to the appliance diagram WARNING There are no user serviceable components beneath the cover of the appliance Only a competent tradesperson should remove the cover Shower is toohot The incoming water is Turn the power knob to during the summer warmer in the summer Medium a
9. an lead to a build up of static pressure To avoid damage to the case when soldered fittings are used pre solder the pipework and fittings before connecting them to the inlet stub Supply pipework MUST be flushed to clear debris before connecting the appliance The appliance is fitted with a 1 2 BSP male outletthread to accept a Mira Zest showerhose When installed in very hard water areas above 200 ppm temporary hardness your installer may advise the installation of a water treatment device to reduce the effects of limescale formation Appliance malfunction due to excessive limescale formation is not covered by the manufacturer s guarantee Your local water company will be able to advise on the hardness of water in your area 12 15 hose retaining ring is supplied to 16 prevent the handset from dropping T below the spillover level of the bath H or shower which could lead to contamination from back siphonage Te Hose Retaining Ring 25 mm minimum Spillover Level The supplied hose retaining ring should meetthe majority of user requirements for shower installations with flexible outlet fittings However there will be occasions when the hose retaining ring will not provide a suitable solution In these instances an outlet double checkvalve must be fitted This will increase the required supply pressure typically by 0 1 bar Double checkvalves fitted in the in
10. chure Specifications Dimensions Wiring Diagram THERMAL CUTOUT RED DUAL DISC BROWN 8 58 BROWN BROWN ON OFF PRESSURE POWER 9 SELECTOR SWITCH BROWN 9 BROWN SOLENO D VALVE ELEMENTS NO BLUE BLUE GREEN EO TANK CONNECTION RED 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 Standards and Approvals 1 This Mira Zest shower complies with all the relevant directives for CE marking Flow Rate Graph 1 These curves are for the specified outputs at 240 V 55 50 2 45 C 35 5 30 S 25 8 5 kW 20 7 5 kW LE 10 2 4 5 6 7 8 9 10 11 12 13 Flow Rate l min 2 Allappliance heating elements have a manufacturing tolerance Flow rates may be above or below those shown on the flow rate graph 3 Theleft hand axis shows temperature rise Temperature rise Showeringtemperature Supply watertemperature Example Forthe 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 T
11. ction has failed internal wiring One of the heater tank Replace the heater tank elements has failed Switch assembly Replace switch assembly diaphragm fault water dripping from the unit Shower The temperature is set too Turn the temperature knob temperature cycles high This is causing the anticlockwise to reduce the between hot and thermal switch to turn off watertemperature cold the heating element to reduce the water DO NOT TAMPER with the temperature thermal switch Turning the The flow regulator is Replace the flow regulator temperature knob faulty does not affect the The handset sprayplate is Remove and clean the watertemperature blocked handset sprayplate Refer to the shower fittings User Guide If the fault persists contact Customer Services 27 No water or very low The handset sprayplate is flow rate blocked The incoming water supply stop valves or the appliance isolating valve is closed The hose or handset is blocked Insufficient water supply pressure The heater tank is excessively scaled The pilot valve is faulty The inlet filter is blocked The power is not turned on atthe double pole Switch The fuse is blown or the MCB RCD has been tripped indicating a possible electrical fault for example heater tank elementfailure 28 Regularly clean the handset sprayplate Refer to the Maintenance section of the handset manual Open
12. ctor are securely trapped within each conductor clamp Terminal Block Electrical P di Cables 22 Outlet Cold Water Supply Pipe Connector Inlet Connector 19 23 24 25 26 Spindle If necessary fit an earth bonding clamp to the supply pipe and ensure that the bonding complies with the relevant regulations in force atthe time of installation Replace the service tunnel Replace the cover If the cover does not fit easily rotate the knobs slightly so that they fit onto the spindles Do not force the cover Tighten the three cover screws Screws Service Tunnel Commissioning Commissioning If you are unsure how electric showers work please read through the Operation section before continuing 1 10 11 Make sure that the TOP control knob is in the STOP position and that the electrical supply has been isolated Turn the BOTTOM control knob fully anticlockwise to the full cold position Turn the water supply fully on at the isolating valve check that water is not leaking from the bottom of the case Switch on the electrical supply at the double pole switch Turn the TOP control knob to the LOW position Check that water flows freely from the shower within a few seconds If not refer to the Maintenance section The water from the handset will be at full force and at a cool temperat
13. ductors as this will prevent them from entering the terminal block Make sure that any pipework that could become frozen is properly insulated DO NOT operate this appliance if itis frozen Allow the appliance to thaw before using The shower unit must not be fitted where it may be exposed to freezing conditions DONOT fitany form of outletflow control as the outlet acts as a ventforthe tank body Only Mira Showers recommended outlet fittings should be used If water leaks from the pressure relief valve maintenance will be required before the appliance can be safely used There user serviceable components beneath the cover of the appliance Only a competent tradesperson should remove the cover 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 Thecoveris not correctly fitted and water has entered the appliance case e The case is damaged e appliance begins to make odd noise smell or smoke The appliance shows signs of a distinct change in performance indicating a need for maintenance The appliance is frozen Isolate the electrical and water supply before removing the cover Mains connections are exposed when the cover is removed Refer to the wiring diagram before making any electrical connections Ensure all electrical connections are tight to prevent overheating This product is not suitable for area
14. e Maintenance Any maintenance must be carried out by a qualified tradesperson following the instructions provided Before replacing any parts ensure that the underlying cause of the malfunction has been resolved WARNING There are no user serviceable components beneath the cover of the appliance Only a competent tradesperson should remove the cover Cleaning Many household and industrial cleaners contain abrasives and chemical substances that can damage the finish of your shower Only clean the shower and fittings with mild washing up detergent or soap solution and then wipe them dry with a soft cloth Cleaning the Inlet Filter WARNING Isolate the electrical and water supplies before removing the cover 1 Remove the three screws that hold the cover on the shower and remove the cover 2 Remove the service tunnel from the shower Screws Cover Service Tunnel Use a suitable spanner to remove the filter from the inlet connector assembly Hold a wrench across Filter the flats of the inlet connector assembly to prevent damage to the connector whilst removing the strainer Inlet Connector Assembly Remove the inlet filter Clean the inlet filter with a stiff brush If necessary use a kettle descalent in accordance with the manufacturer s instructions Refit the components in reverse order Inlet Filter Inlet Connector Assembly 31 Relief Valve Assembly R
15. e difficulty simply contact our Customer Services who will give every assistance and if necessary arrange for our service engineer to visit If later the performance of your shower declines consultthis manual to see whether simple home maintenance is required Please call our Customer Services to talk the difficulty through request service under guarantee if applicable or take advantage of our comprehensive After Sales service As part of our quality and training programme calls may be recorded or monitored Our Customer Services Team is comprehensively trained to provide every assistance you may need help and advice spare parts or a service visit Mira Showers Kohler Mira Ltd Cromwell Road Cheltenham GL52 5EP P4340 J96E Mira is a registered trade mark The company reserves the right to alter product specifications without notice www mirashowers com Spare Parts We maintain an extensive stock of spares and aim to have functional parts available for ten years from the date of final manufacture of the product Spares can be purchased from approved stockists or merchants locations on request or direct from Customer Services Spares direct will normally be despatched within two working days Payment can be made by Visa or Mastercard at the time of ordering Should payment by cheque be preferred a pro forma invoice will be sent Note In the interests of safety spares requiring exposure to mains voltages can
16. eating element to reduce the watertemperature 26 Clean the handset sprayplate Refer to the Maintenance section of the handset manual Open the stop isolating valve completely Clear the blockage or replace the hose or handset Switch on the power at the double pole switch Renew the fuse or reset the MCB RCD If the fault persists contact the shower installer Ensure the other water outlets such as the washing machine or dishwasher are not in use during showering Ensure that the incoming water supply stop and the isolating valve are completely open If the fault persists contact the shower installer Contact installer to replace faulty parts Turn the temperature knob anticlockwise to reduce the water temperature Installer Fault Diagnosis The troubleshooting information below gives details on solutions to problems with the shower for installers Before replacing any parts ensure that the underlying cause of the malfunction has been resolved Read the Important Safety Information section first and refer to the appliance diagram No hot water from Insufficient water supply Contact the local water shower with the pressure authority knobs in any Failure of the pressure Check the continuity of the position switch microswitch or Switches using a suitable thermal switch continuity measuring device Replace the switches as necessary Aninternal wiring Check the integrity of the conne
17. ered or is a member of an association such as e Institute of Plumbing IOP throughout the UK e National Association of Plumbing Heating and Mechanical Services Contractors NAPH amp 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 e the young e the elderly e the infirm e the disabled who suffers from a medical condition that can result in temporary incapacity e g epilepsy or blackouts e inexperienced in the correct operation of the controls 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 Pack Contents Checklist Tick the appropriate boxes to familiarise yourself with the part names and to confirm that the parts are included gt BS L1 3 x Wall Plugs X L1 3 x Fixing Screws O 1 x Mira Zest Electric Shower Documentation 1x Installation amp User Guide 1x Installation Template L1 1xGuarantee Bro
18. ese conditions are unavoidable itis necessary to determine the cable size which will prevent damage to the cable caused by overheating To obtain full advantage of the power provided by this unit use the shortest possible cable route from the consumer unit to the shower A30 mA residual current device RCD should be fitted This may be part of the consumer unit or a separate unit 14 A separate permanently connected supply must be taken from the consumer unitto the appliance through a double pole switch which has a minimum 3 mm contact separation The switch can be a ceiling mounted pull cord type within the shower room or a wall mounted switch in an adjacent room DO NOT twist the individual cable cores of the live and neutral conductors as this will prevent them from entering the terminal block DO NOT exert strain on the terminal block DO NOT turn on the electrical supply until the plumbing has been completed o Be Plumbing and Electrical Schematic Diagram 15 Installation WARNING Isolate the electrical and water supplies before installing the shower 1 Decide ona suitable position for the appliance minimum distance of 200mm from the ceiling to allow for cover fit and removal The position of the appliance and the shower fittings must provide a minimum gap of 25 mm between the spill over level of the shower tray bath and the handset This is to prevent backsiphonage 2
19. esetting WARNING Isolate the electrical and water supplies before removing the cover Mains electricity connections are exposed when the cover is removed 1 Remove the three screws that hold the cover remove the cover Note The rubber ball is ejected to reduce the damage if the outlet is blocked or the appliance is frozen 2 Remove the five screws that hold the switch assembly heater tank and flow regulator assembly Switch Assembly Heater Tank Flow Regulator Assembly 3 Liftoutthe switch assembly heater tank and flow regulator assembly 4 Using your finger push the ball back into the tank Do not remove the O seal 5 Refit the components in reverse order 6 Replace the cover If the cover does not fit easily rotate the knobs slightly so that they fit into the spindles Do not force the cover 32 Flow Regulator Assembly Switch Assembly Removal and Installation WARNING Isolate the electrical and water supplies before removing the cover Mains electricity connections are exposed when the cover is removed 1 2 Remove the three cover retaining screws the cover and the service tunnel Remove the hose from the outlet connector and loosen the connection to the inlet connector Remove the six screws that hold the switch assembly heater tank flow regulator assembly and inlet connector Screws gt Cover Shower Service Tunnel Remove all wiring from the spade connection
20. he flow rate is therefore 4 l min 10 Installation Requirements Plumbing 1 The Mira Zest 7 5 kW and 8 5 kW electric showers are designed to operate with a minimum maintained inlet pressure of 0 7 bar up to a maximum static inlet pressure of 10 bar The appliance is normally connected to the cold water mains fed supply However the water supply can be taken from a cold water storage cistern provided there is a minimum maintained inlet head of water of 7 metres the vertical distance from the base of the cold water storage cistern to the shower fitting handset To reduce pressure losses and fluctuations the cistern fed water supply must be independent from other supply draw offs and should avoid long horizontal pipe runs and use swept bends rather than 90 elbows For further advice please refer to the back cover of this guide for Mira Showers contact telephone and fax numbers The appliance is suitable for installation within the shower area It is fitted with a pressure relief device and must be positioned over a water catchment area with the controls at a convenient height for the user The shower fitting should be positioned so that it discharges down the centre line of the bath or across the opening of a shower cubicle and mustbe directed away from the appliance The appliance is fitted with an inlet connector assembly that is designed to accept plumbing supplies from the top or bottom The water supply can be fed with 15
21. let supply to the appliance cause a pressure build up which could exceed the maximum static inlet pressure for the appliance Avoid layouts where the shower hose will be sharply kinked This may reduce the life of the hose 13 Electrical 1 In a domestic installation the rating of the electricity supply company fuse and the consumer unit must be adequate for the additional demand This is a high power appliance and it is essential to contact your electricity supply company to ensure that the supply is adequate for the appliance Voltage drop due to local heavy demand will reduce the performance of the shower The appliance must be earthed by connecting the supply cable earth conductor to the earth terminal Supplementary bonding Within the bathroom or shower room all accessible conductive parts of electrical equipment and extraneous conductive parts that are likely to introduce earth potential must be electrically bonded to earth using a minimum cable size of 4 0 mm if the cable is not mechanically protected 2 5 mm if mechanically protected The minimum cable size cross sectional area required is 6 mm under normal installation conditions See note 4 Important The shower circuit should be separated from other circuits by atleast twice the diameter of the cable or conduit and it should not be run through thermally insulating material or in locations where the ambient temperature is likely to exceed 30 C If any of th
22. mm pipe or 10 mm microbore pipe suitably adapted into the inlet connector assembly If 10 mm microbore is used then an allowance for increased pressure loss must be made to ensure that the minimum maintained inlet pressure is achieved Do not fit the appliance to the wall and tile up to the case The appliance must be fitted onto a finished flat and even wall surface Otherwise difficulty may be encountered when fitting the cover and subsequent operation of the unit could be impaired small pillars moulded on to the back of the case allow air circulation Use only the inlet connector assembly supplied with the appliance Do not use any other types of fitting Refrain from applying excessive force when making any connections Always provide mechanical support when making the plumbing connections This appliance is not designed to be plumbed directly from the rear For a rear entry supply add an elbow to the supply pipe and connectitas a rising or falling supply 11 10 11 12 13 14 Do notinstall the appliance ina position where it may become frozen shower unit must not be fitted where it may be exposed to freezing conditions The shower unit must not be used if you suspect it may be frozen We recommend thata non restrictive free flowing isolating valve is fitted in the cold water supply pipe to allow the complete maintenance of the appliance Do notuse a valve with a loose washer plate jumper as this c
23. nd adjust the sothe shower power temperature knob until the setting is too high desired temperature is reached Shower is too hot Thehandsetsprayplate Regularly clean the handset is blocked sprayplate Refer to the Maintenance section of the handset manual Turning the Thehandsetsprayplate Remove and clean the temperature knob is blocked handset sprayplate Refer to does not affect the the Maintenance section of watertemperature the handset manual If the fault persists contact the shower installer The water continues Brokendiaphragm Contact your installer to to flow when the replace the flow valve double pole switch assembly is turned off 25 No water or very low flow rate No hot water from shower with the knobs in any position Shower temperature cycles between hot and cold The handset sprayplate is blocked The incoming water supply stop valves or the appliance isolating valve is closed The hose or handset is blocked The power is off at the double pole switch The fuse is blown or the MCB RCD has been tripped indicating a possible electrical fault Other water outlets are being used during showering causing the water pressure to drop below the minimum required The water pressure is below the minimum required Failure of pressure switch micro switch or thermal switch The temperature is set too high This is causing the thermal switch to turn off the h
24. s As the water temperature falls the elements will be turned on The switch will cycle on off on if the flow rate is not increased and the temperature of the shower reduced Check the shower temperature before entering the shower The previous user may have selected a different temperature setting When the shower is first turned on or the temperature setting is changed there will be a slight delay before the water temperature changes 22 Operation Instructions Note Read the Important Safety Information section first WARNING The spray plate holes must be kept clear The spray plate should be regularly removed and cleaned in descalent Lack of regular spray plate cleaning will lead to poor performance and cause early failure of the appliance See the shower fittings User Guide for more information To turn the shower on 1 Switch on the electrical supply at the double pole Switch Turnthe power knob to High Wait 15 20 seconds for warm water to reach the handset For electrical economy set the power knob to Medium This setting will provide sufficient power when the supply water temperature is warmer such as in the summer For an unheated shower set the power knob to Low To set the shower temperature 1 Set the shower temperature by rotating the temperature knob as necessary Turn the knob clockwise for hotter water and anticlockwise for cooler water Wait 10 15 seconds for the adjusted temperature to re
25. s against any defect of materials or workmanship for one year from the date of purchase To validate the guarantee please return your completed registration card Within the guarantee period we will resolve defects free of charge by repairing or replacing parts or modules as we may choose To be free of charge service work must only be undertaken by Mira Showers or our approved agents in Northern Ireland and Republic of Ireland Service under this guarantee does not affect the expiry date The guarantee on any exchanged parts or product ends when the normal product guarantee period expires Not covered by this guarantee Damage or defects arising from incorrectinstallation improper use or lack of maintenance including build up of limescale Damage or defects if the product is taken apart repaired or modified by any person not authorised by Mira Showers or our approved agents This guarantee is in addition to your statutory and other legal rights Before using your shower Please take the time to read and understand the operating and safety instructions detailed in this manual What to do if something goes wrong If when you first use your shower it doesn tfunction correctly first contact your installer to check that installation and commissioning are satisfactory and in accordance with the instructions in this manual We are on hand to offer you or your installer any advice you may need Should this not resolve th
26. s on the switch assembly Note Using long nose pliers gently squeeze the lever lock and pull the spade connection off the switch assembly Switch Assembly Spade Connection Lever Lock 33 5 Carefully pull off the two brown wires attached to the microswitch Note the position of the wires Microswitch 6 Carefully pull off the blue wire and brown wire from the solenoid fitted to the flow regulator Note the position of the wires Solenoid 7 Carefully pull the flow regulator assembly switch assembly and the heater tank away from the case Carefully separate the flow regulator from the switch assembly and inlet connector by gently pulling apart Switch Assembly 75 Heater Tank Inlet Connector Flow Regulator Assembly 8 the components in reverse order Make sure that the electrical wires and O seals are installed in the correct positions 35 Heater Tank Removal and Installation WARNING Isolate the electrical and water supplies before removing the cover Mains electricity connections are exposed when the cover is removed 1 Remove the three cover retaining screws the cover and the service tunnel 2 Remove the hose from the outlet connector and ease the inlet connector off the inlet supply pipe 3 Remove the six screws that hold the inlet clamp bracket flow regulator assembly Switch assembly and heater tank Switch Assembly Screws Hea
27. s with very high humidity i e steam rooms Please consult your installer CAUTION 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 Followall 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 inforce atthe 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 e National Inspection Council for Electrical Installation and Contracting NICEIC throughout the UK e Electrical Contractors Association ECA England and Wales e 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 regist
28. ter Tank Flow Regulator Assembly 36 5 6 Remove all wiring from the switch assembly Note Using long nose pliers gently squeeze the lever lock on the top two spade connection and pull them off the Switch assembly Carefully pull the two lower connections off the switch assembly Carefully pull off the blue wire to the solenoid fitted to the flow regulator Note the position of the wire Ease off both thin brown wires attached to the microswitch Note the position of the wires 37 10 11 12 13 Lift out the flow regulator assembly Switch Assembly switch assembly and the heater tank from the case Carefully separate the flow regulator assembly from the switch assembly inlet connector and heater tank by gently pulling apart Make a note of the positions of all the wiring on top of the heater tank Heater Tank Inlet Connector Flow Regulator Assembly Remove the screw that holds the green earth wire to the thermal trip 7 Green Earth Wire Ease the thermal trip away from the heater tank Caution Do not press printed disc Blue Neutral on the thermal trip as this will make Wire the component unserviceable Remove the screw that holds the two blue wires to the top of the heater tank Refit the components in reverse order Make sure that the electrical wires and O seals are installed in the correct positions 38 Thermal Trip Removal
29. ure Turn the BOTTOM knob slowly clockwise As the knob is rotated the flow will be reduced and the temperature will remain cool this shows that the flow regulator assembly is operating correctly Return the knob anticlockwise to full cold position Turn the TOP knob to the MEDIUM position The temperature of the water should rise slightly Allow a few seconds for the warm water to reach the handset this shows that the MEDIUM power setting is operating correctly Turn the TOP knob to the HIGH position The temperature of the water will rise further this shows that the full power setting is operating correctly Set the shower temperature by rotating the BOTTOM knob as necessary Turn the knob clockwise for hotter water and anticlockwise for cooler water Note When the temperature is changed the flow rate will change When the required temperature is reached turn to the STOP position to stop the flow Water may continue to flow from the handset for a few moments during shut down as water is purged from the tank Isolate the power at the double pole switch A small amount of water may be retained in the shower fitting after the shower control has been turned off This may drain over a few minutes Note A slight hissing sound may be heard from the appliance during operation High mains water pressure and high shower temperatures will effect the tone This is quite normal when the shower is in use 21 Adviceto Users 1
30. uture 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 Recommended Usage Domestic v Light Commercial v Heavy Commercial x Healthcare x If you experience any difficulty with the installation or operation of your new shower control please referto the Fault Diagnosis section before contacting Kohler Mira Our telephone and fax numbers can be found on the back cover of this guide Important Safety Information WARNING 1 10 11 12 13 14 15 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 THIS APPLIANCE MUST BE EARTHED In accordance with 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 DO NOT twist the individual cable cores of the live and neutral con
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