electric shower instruction manualresources.kohler.com/plumbing/mira/pdf/p34981-mira...retaining...

1

7.5,

8.5

and 9

.5 k

W

INSTRUCTION MANUAL

ELECTRIC SHOWER

THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER

2

Contents

Page

Introduction ................................................................... 3

Important Safety Information.................................................... 4

Pack Contents Checklist .......................................................... 6

Dimensions ................................................................... 7

Wiring Diagram ................................................................... 8

Specifications ............................................................................ 9

Installation Requirements......................................................... 9

Installation ................................................................. 14

Commissioning ....................................................................... 18

Operation ................................................................................. 19

Maintenance ............................................................................ 23

Fault Diagnosis ....................................................................... 25

Spare Parts .............................................................................. 30

Accessories ............................................................................. 30

Guarantee, Customer Care Policy, and How to contact us

.............................................................................. Back cover

3

Introduction

If you experience any difficulty with the installation or operation of your new showercontrol, then please refer to the Maintenance and Fault diagnosis section, beforecontacting Caradon Plumbing Solutions. Our telephone and fax numbers can befound on the back cover of this guide.

Thank you for purchasing a quality Essentials product. To enjoy the full potential of yournew product, please take time to read this guide thoroughly, having done so, keep it handyfor future reference.

The Essentials electric showers have separate controls for power selection andtemperature/flow adjustment. A unique flow regulator stabilises temperature changescaused by water pressure fluctuations. These can result from taps being turned on or offor toilets being flushed.

Appliances covered by this guide:

Essentials 7.5 - A 7.5 kW 240 V AC (6.85 kW 230 V AC) heater with an adjustable sprayhandset with three different spray actions (start, force and soothe). Individual lightsindicate, 'POWER', 'LOW PRESSURE' and 'OVERHEAT'. Supplied complete withflexible hose, adjustable clamp bracket assembly, slide bar and supports and hoseretaining ring. Available in white/chrome finish.



4

SectionImportant 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 andrecommendations.

2. THIS APPLIANCE MUST BE EARTHED.

3. In accordance with ‘The Plugs and Sockets etc. (Safety) Regulations in force at thetime of installation, this appliance is intended to be permanently connected to thefixed electrical wiring of the mains system.

4. DO NOT twist the individual cable cores of the live and neutral conductors, as thiswill prevent them from entering the terminal block.

5. Make sure that any pipework that could become frozen is properly insulated.

6. DO NOT operate this appliance if it is frozen. Allow the appliance to thaw beforeusing again. The shower unit must not be fitted where it may be exposed to freezingconditions.

7. DO NOT fit any form of outlet flow control as the outlet acts as a vent for the tankbody. Only Caradon Plumbing Solutions recommended outlet fittings should beused.

8. There are no user serviceable components beneath the cover of the appliance.Only a competent tradesperson should remove the cover.

9. If any of the following conditions occur, isolate the electricity and water suppliesand refer to “To contact us”, on the back page of this guide.

- If the cover is not correctly fitted and water has entered the appliancecase.

- If the case is damaged.

- If the appliance begins to make an odd noise, smell or smoke.

- If the appliance shows signs of a distinct change in performance, indicating aneed for maintenance.

- If the appliance is frozen.

10. Isolate the electrical and water supply before removing the cover.

11. Mains connections are exposed when the cover is removed.

12. Refer to the wiring diagram before making any electrical connections.

13. Ensure all electrical connections are tight, to prevent overheating.

5

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 orinside the appliance.

4. The electrical installation must comply with the “Requirements for ElectricalInstallations” commonly referred to as the IEE Wiring Regulations, or any particularregulations and practices, specified by the local electricity supply company in forceat the time of installation. The installation should be carried out by an electrician orcontractor who is registered, or is a member of, an association such as:

- National Inspection Council for Electrical Installation and Contracting (NICEIC),throughout the UK, Tel: 0171 582 7746.

- The Electr ical Contractors Association (ECA), England and Wales,Tel: 0171 229 1266.

- The Electrical Contractors Association of Scotland (ECAS),Tel: 0131 445 5577.

5. This is a high power unit; it is essential to contact your electricity supply companyto ensure that the electricity supply is adequate for the purpose.

6. The plumbing installation must comply with the requirements of UK WaterRegulations/Bye-laws (Scotland), Building Regulations or any particular regulationsand practices, specified by the local water company or water undertakers. Theinstallation should be carried out by a plumber or contractor who is registered, or isa member of, an association such as:

- Institute of Plumbing (IOP), throughout the UK, Tel: 01708 472791.

- National Association of Plumbing, Heating and Mechanical Services Contractors(NAPH & MSC), England and Wales, Tel: 01203 470626.

- Scottish and Northern Ireland Plumbing Employers’ Federation (SNIPEF), Scotlandand Northern Ireland, Tel: 0131 225 2255.

7. Anyone who may have difficulty understanding or operating the controls of anyshower should be attended whilst showering. Particular consideration should begiven to the young, the elderly, the infirm, or anyone inexperienced in the correctoperation of the controls.

8. When this appliance has reached the end of its serviceable life, it should be disposedof in a safe manner, in accordance with current local authority recycling, or wastedisposal policy.

6

� Tick the appropriate boxes to familiarize yourself with the part names and to confirm that theparts are included.

2. Documentation

1 x Instruction Manual �

1 x Guarantee Card �

�

SectionPack Contents Checklist

1. Essentials 7.5, 8.5 or 9.5 kW

1 x Essentials 7.5, 8.5 or 9.5 �

3 x Fixing Screws �

3 x Wall Plugs �

7

SectionDimensions

200 mm 83 mm

345 mm

8

Wiring Diagram

TERMINALBLOCK

DOUBLE POLE SWITCH45A BREAK CAPACITY

3 mm CONTACT SEPARATION

GREEN / YELLOW

BROWN

220/240VAC ONLY

HEATER TANKBLUE

L E

GREEN(61A)

BLUE (58)

BLUE (59A)

GREEN (60)

C

C1

AA2

A1

B B1

BROWN(59A)

SWITCH ASSEMBLY

NEON ASSEMBLY

RED (57)

THERMAL SWITCH

ORANGE (56)

BROWN (53)

RED (54)

N

RED(59A)

BROWN(57)

BROWN (55)

PURPLE (59A)

9

Installation Requirements

Specifications

Plumbing

1. Minimum maintained inlet pressure 0.8 bar for satisfactory operation.

2. Maximum static inlet pressure 10 bar.

3. Minimum static pressure 0.5 bar to keep the flow valve closed.

Electrical

1. The appliance requires a 40 Amp fuse.

2. The terminal block will not accept cable larger than 10 mm2.

Standards and Approvals

1. This Essentials shower complies with all the relevant directives for CE marking.

Plumbing

1. The appliance is designed to operate with a minimum maintained inlet pressure

of 0.8 bar up to a maximum static inlet pressure of 10 bar.

2. 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 aminimum maintained inlet head of water of 8 metres (the vertical distance from thebase of the cold water storage cistern to the shower fitting handset). To reducepressure losses and fluctuations, the cistern-fed water supply must be independentfrom other supply draw-offs, and should avoid long horizontal pipe runs and useswept bends rather than 90° elbows. The appliance may be installed with a showerpump to increase the cistern-fed inlet supply pressure. For further advice pleaserefer to the back cover of this guide for Caradon Plumbing Solutions contact telephoneand fax numbers.

3. The appliance is suitable for installation within the shower area. It is fitted with apressure relief device and must be positioned over a water catchment area with thecontrols at a convenient height for the user. The shower fitting should be positionedso that it discharges down the centre line of the bath, or across the opening of ashower cubicle, and must be directed away from the appliance.

10

4. The appliance is fitted with an inlet connector assembly that is designed to acceptplumbing supplies from the top, bottom or back. The water supply can be fed with 15mm 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 bemade to ensure that the minimum maintained inlet pressure is achieved.

5. Do not fit the appliance to the wall and tile up to the case. The appliance must befitted onto a finished flat and even wall surface. This is important as difficulty maybe encountered when fitting the cover and subsequent operation of the unit could beimpaired (small pillars moulded on to the back of the case allow air circulation).

6. Use only the inlet connector assembly supplied with the appliance, do not use anyother types of fitting.

7. Refrain from applying excessive force when making any connections. Always providemechanical support when making the plumbing connections.

8. Back entry plumbing is accommodated without the need to recess the compressionconnector, however, it is advisable to seal around the incoming mains-fed supply toprevent water ingress into the wall.

9. Do not install the appliance in a position where it may become frozen. Theshower unit must not be fitted where it may be exposed to freezing conditions. Theshower unit must not be used if suspected of being frozen.

10. We recommend that a non-restrictive (free flowing) isolating valve is fitted in thecold water supply pipe to allow the complete maintenance of the appliance. Do not

use a valve with a loose washer plate (jumper) as this can lead to a build up of staticpressure.

11. To avoid damage to the case when soldered fittings are used, pre-solder the pipeworkand fittings before connecting them to the inlet stub.

12. The appliance is fitted with a ½ " BSP male outlet thread, to accept an Essentialsshower hose.

13. Supply pipework MUST be flushed to clear debris before connecting the appliance.

14. When installed in very hard water areas (above 200 ppm temporary hardness) yourinstaller may advise the installation of a water treatment device, to reduce theeffects of limescale formation. Appliance malfunction due to excessive limescaleformation is not covered by the manufacturer’s guarantee. Your local water companywill be able to advise on the hardness of water in your area.

11

15. A hose retaining ring is supplied to prevent the handset from dropping below thespillover level of the bath or shower, which could lead to contamination from back-siphonage (refer to Figure 1). The supplied hose retaining ring should meet the greatmajority of user requirements for shower installations with flexible outlet fittings.However, there will be occasions when the hose retaining ring will not provide asuitable solution. In these instances an outlet double checkvalve, e.g. the MiraDCV-H, must be fitted. The inclusion of the Mira DCV-H will increase the requiredsupply pressure typically by 0.1 bar.

Double checkvalves, fitted in the inlet supply to the appliance, cause a pressurebuild-up, which could exceed the maximum static inlet pressure for the appliance.

16. Water flow can be obtained without the electrical power being connected. This allowsthe plumbing connections to be tested prior to final connection of the electricalsupply.

17. Avoid layouts where the shower hose will be sharply kinked. This may reduce the lifeof the hose.

Hose RetainingRing

25 mm Minimum

Spill-overLevel

Figure 1

Electrical

1. In a domestic installation, the rating of the electricity supply company fuse and theconsumer unit must be adequate for the additional demand. As these appliancesare high power units, it is essential to contact your electricity supply company toensure that the supply is adequate for the appliance. Voltage drop due to localheavy demand will reduce the shower's performance.

12

2. The appliance must be earthed by connecting the supply-cable earth conductor tothe earth terminal.

Supplementary bonding: Within the bathroom or shower room, all accessibleconductive parts of electrical equipment and extraneous conductive parts that arelikely to introduce earth potential, must be electrically bonded to earth using aminimum cable size of 4.0 mm2 if the cable is not mechanically protected (2.5 mm2

if mechanically protected).

3. The minimum cable size (cross-sectional area) required is 6 mm2 under normalconditions of installation.

Important! The shower circuit should be separated from other circuits by at leasttwice the diameter of the cable or conduit and it should not be run through thermallyinsulating material or in locations where the ambient temperature is likely to exceed30 °C. If any of these conditions are unavoidable it is necessary to determine thecable size which will prevent damage to the cable caused by overheating.

4. To obtain full advantage of the power provided by this unit, use the shortest possiblecable route from the consumer unit to the shower. It is also necessary to satisfy thedisconnection time and thermal constraints which mean that, for any givencombination of current demand, voltage drop and cable size, there is a maximumpermissible length of circuit.

As a guide only, the following maximum permissible lengths are given for 6 mm2

cable protected by a 40A MCB type B and allowing for a 5 volt drop:

Essentials 7.5 kW (240 V AC) at 240 V - 22 Metres



5. A 30 mA residual current device (RCD) should be fitted. This may be part of theconsumer unit or a separate unit.

6. A separate, permanently connected supply must be taken from the consumer unitto the appliance through a double-pole switch, which has at least3 mm contact separation. The switch can be a ceiling mounted pull-cord type withinthe shower room or a wall mounted switch in an adjacent room. Suitable ceilingmounted pull-cord switches for Essentials electric showers include:

Make Model Rating

Volex VX9706 40 Amp

Crabtree 2167 40 Amp

MK 3164 WHI 45 Amp

Ashley CS445N 45 AmpTenby CS7545 45 Amp

13

7. DO NOT twist the individual cable cores of the live and neutral conductors, as this willprevent them from entering the terminal block.

8. DO NOT exert strain on the terminal block.

9. DO NOT turn-on the electrical supply until the plumbing has been completed.

Plumbing and Electrical Schematic Diagram

14

Installation

Essentials 7.5, 8.5 and 9.5 kW

WARNING! Isolate the electrical and water supplies before proceeding with the installationof the appliance.

Note! An installation template is supplied to help you install the Essentials shower.

1.1. Decide on a suitable position for the Essentials shower (minimum distance of200 mm from the ceiling to allow for cover fit and removal). The position of theEssentials shower and the shower fittings must provide a minimum gap of 25mm between the spill-over level of the shower tray/bath and the handset.

1.2. Remove the three cover retaining screws.

1.3. Remove the cover.

1.4. Remove the service tunnel.

1.5. Determine the direction of the inlet water supply: top (falling), bottom (rising),or back inlet .

Note! Make sure that the back inlet does not go directly back into the wall.It is recommended to use a soldered elbow

1.6. The inlet connector assembly is configured to suit a falling supply. To changethe configuration to suit a rising supply (refer to Figure 2):- remove the inlet strainer and compression nut- refit the inlet connector and compression nut in the opposite ends.

1.7. Remove as appropriate the thinned case areas to suit the supplies entering theproduct.

1.8. Thoroughly flush the mains-fed cold water supply pipe. The supply must

be clean and free from debris BEFORE connecting the Essentials shower.

1.9. Put the installation template on the wall and mark through the positions of thefixing holes. Make sure that sufficient electrical supply cable is available forconnection to the terminal block.

1.10. Drill and plug the top two fixing holes. Secure the Essentials shower to the wallwith the screws provided. Drill the bottom fixing hole with the product in place.Alternative fixings (not supplied) may be necessary for some wall structures.Avoid drilling into any supply cable/pipe.

15

Overheat

Power

Low pressure

Temperature

1

2

3

45 6

7

8

9

Installation of the Essentials Electric Shower

Figure 2

Inlet ConnectorAssembly

Cold WaterSupply Pipe(rising supplyillustrated)

Terminal Block

Hole For CoverRetaining Screws

Do not fit the Essentialsshower to the wall and tile upto the case. The Essentialsshower must be fitted onto

a finished flat and even wallsurface (small pillarsmoulded on to the back ofthe case allow aircirculation).

Fixing Screw

Inlet Connector AssemblyConfiguration For A RisingSupply

Inlet Connector AssemblyConfiguration For A FallingSupply


Inlet Strainer


Inlet Strainer

Make sure that the back inletdoes not go into the walldirectly.

It isrecommendedyou use asolderedelbow.

16

Installation of the Essentials Electric Shower - Electrical

Figure 3

1.11. Install the mains-fed cold water supply pipe.

1.12. Make the connection to the mains-fed cold water supply pipe.

1.13. Bring the electrical supply cable into the case through one of the cable entrypoints (refer to Figure 3).

1.14. Strip back sufficient of the outer cable insulation to enable routing to terminalblock. Do not twist the individual cores of the live and neutral conductors orstrain the wires to the terminal block form a loop as shown.

1.15. Fit an earth sleeve to the earth conductor. Connect the conductors firmly intothe terminal block. Make sure that the bare cores of each conductor are securelytrapped within each conductor clamp.L = Red wireN = Black wireE = Yellow/Green sleeved wire.

1.16. Re-tighten the terminal block screws.

1.17. If necessary, fit an earth bonding clamp to the copper supply pipe and ensurebonding complies with relevant regulations in force at the time of installation.

Electrical SupplyCable

Terminal Block

Form a loop in theelectrical supplycable

17

1.18. Turn both control 'D' spindles to the positions shown in Figure 4. Replace thecover ensuring the control knobs are positioned to fit onto the spindles allowingthe cover to fit properly. Fit and tighten the three cover retaining screws.

1.19. Fit the shower fittings. Refer to separate instructions.

OverheatOverheat

Power

Low pressureLow pressure

Temp ratue er

Stop

Low MedHigh

Spindle Positions when replacing Cover

Figure 4

'D' Spindle

18

Commissioning

If you are unsure how electric showers work, please read through the Operation sectionbefore continuing.

1. Make sure that the left hand control knob is in the 'Stop' position.

2. Turn the right hand control knob fully anticlockwise to the full cold position.

3. Turn on the water supply fully at the isolating valve, check that water is not leakingfrom the bottom of the case.

4. Switch on the electrical supply at the double pole switch. The 'Power' neon on theEssentials shower will provide a visual indication that the electrical supply isconnected.

5. Turn the left hand control knob to the 'Low' position. Check that water flows freelyfrom the shower within a few seconds. If not refer to Maintenance. The water fromthe handset will be at full force and at a cool temperature.

6. Turn the right hand knob slowly clockwise. As the knob is rotated the flow will bereduced and the temperature will remain cool - this shows that the flow regulatorassembly is operating correctly. Return the knob to full flow.

7. Turn the left hand knob to the 'Med' position. The temperature of the water shouldrise slightly. Allow a few seconds for the warm water to reach the handset - thisshows that the half power setting is operating correctly.

8. 'High' position. The temperature of the water will rise further - this shows that thefull power setting is operating correctly.

9. Set the shower tempreature by rotating the right hand knob as necessary. Turn theknob clockwise for hotter water and anticlockwise for cooler water.

Note! When the temperature is changed the flow rate will change.

10. When the required temperature is reached, turn the left hand knob to 'Stop' andisolate the power at the double pole switch.

Note! A slight hissing sound may be heard from the appliance during operation.High mains water pressure and high shower temperatures will affect the tone. Thisis quite normal when the shower is in use.

Commissioning

19

Advice to Users

1. Electric showers work by taking in cold water and passing it over the heating elementscontained in the tank body of the shower.

2. 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 showerhandset should always be kept clean to maintain a consistent flow and stable showertemperatures.

3. The appliance is designed to stabilise temperature changes caused by water pressurefluctuations. These can result from taps being turned on or off or toilets being flushed.Under such conditions average shower temperatures will be held within a 6°C band,provided that the minimum required pressure is maintained.

4. Seasonal changes in the temperature of the incoming cold water supply and/orfluctuations in mains electrical voltage, will require the 'Temperature' knob to beadjusted as necessary.

5. The appliance requires a minimum pressure of 0.8 bar to operate. At pressuresabove 0.8 bar the appliance will minimise the temperature fluctuations caused whenother draw-off points are used. If the flow rate drops below an acceptable value, theappliance will turn the heater elements off, resulting in a cold shower. The 'Low

pressure' neon on the Essentials shower will provide visual confirmation of thiscondition.

6. If the water temperature reaches an unsafe level, the thermal switch assemblyturns off the heating elements. As the water temperature falls the elements will beturned on. The switch will cycle on/off/on if the flow rate is not increased and thetemperature of the shower reduced. The 'Overheat' neon on the Essentials showerwill provide visual confirmation of this condition.

7. Check the shower temperature before entering the shower. The previous user mayhave selected a different temperature setting.

8. When the shower is first turned on, or a different temperature is selected, there willbe a slight delay before the water temperature changes.

Operation

20

Select ShowerTemperature ByRotating Clockwise AsNecessary

Essentials Controls

Figure 6

21

Temperature rise versus flow rate for the Essentials range

Flow rate (litres per minute)

Tem

pera

ture

ris

e °C

8.5kW

7.5kW

121132 6 7 109854

10

15

20

25

30

35

40

45

50

55

Example: For the Essentials 8.5 kW on full power setting with an incoming water supplyat 10°C and a showering temperature at 42°C, the temperature rise is 32°C. The flow rateis therefore, 4 l/min.

(a) These curves are for the specified outputs at 240V.

(b) All appliance heating elements have a manufacturing tolerance. Thus flowrates can be above or below those indicated.

(c) The left-hand scale is temperature rise. (Temperature rise = Showeringtemperature minus the incoming cold water temperature.)

9.5kW

22

Essentials 7.5, 8.5 and 9.5

Read the section 'Important Safety Information' first.

THE SPRAY PLATE HOLES MUST BE KEPT CLEAR. The spray plate should beregularly removed and cleaned in descalent. Lack of regular spray plate cleaning will leadto poor performance and cause early failure of the appliance.

1. Switch on pullcord or wall mounted switch. The 'Power' neon on the Essentialsshower will provide visual indication that the switch is on.

2. Rotate the LEFT HAND control knob to position 'High' (Full Power).

3. Wait 15-20 seconds for warm water to reach the handset.

4. If necessary turn the RIGHT HAND control knob slowly to adjust temperature. Allow10-15 seconds for the adjusted temperature to reach the handset. The control knoboperates through approximately ¾ of a turn from cold to hot. Clockwise rotation willgive warmer water with less flow. Anticlockwise rotation will give cooler water withmore flow.

Note! Should the product alternate (Hot - Cold). Adjust the right hand control knobanti clockwise to reduce the temperature. This is normal operation if too high awater temperature is selected.

5. TO TURN OFF turn the LEFT HAND control knob anticlockwise to the 'Stop' position.

6. A small amount of water may continue to flow from the handset for a few moments.

(For summer economy showering use the 'Med' (Half Power) position on the control.For a cold shower select 'Low'.

7. Switch off at the pull-cord or wall mounted switch.

23

Inlet Strainer Cleaning

WARNING! Isolate the electrical and water supplies before removing the cover. Mainselectricity connections are exposed when the cover is removed.

1. Remove the three cover retaining screws and remove the cover and the servicetunnel.

2. Use a suitable 24 mm A/F spanner to remove the hexagon nut on the inlet connectorassembly. Hold a wrench across the flats of the inlet connector assembly to preventdamage to the connector, whilst removing the hexagon nut. Do not remove the 'O'seal.

3. Remove the inlet strainer.

4. Clean all the inlet strainer with a stiff brush. If necessary use a kettle descalent inaccordance with the manufacturer's instructions.

5. Refit the components in reverse order.

Maintenance

Cleaning

Many household cleaners contain abrasives and chemical substances, and should notbe used for cleaning plated or plastic fittings. These finishes should be cleaned with amild washing up detergent or soap solution, and then wiped dry using a soft cloth.

General

Read the section “Important Safety Information” first.

Providing the shower has been correctly installed and is operated in accordance with theinstructions contained in this guide, difficulties should not arise. If any maintenance isrequired then it must be carried out by a competent tradesperson the maintenanceinstructions are provided. Before replacing any parts ensure that the underlying cause ofthe malfunction has been resolved.

WARNING! There are no user serviceable components beneath the cover of theappliance. Only a competent tradesperson should remove the cover.

24

Relief Valve Assembly - Resetting

WARNING! Isolate the electrical and water supplies before removing the cover. Mainselectricity connections are exposed when the cover is removed.

1. Remove the cover.

Note! The rubber ball is ejected to reduce the damage if the outlet is blocked or theappliance is frozen.The rubber ball will be trapped between the cover and the reliefvalve assembly and will fall out when the cover is removed.

2. Use suitable pliers to remove the relief valve assembly. Do not remove the 'O' seal.

3. Moisten the rubber ball and insert it into the inner end of the relief valve assembly.

4. Refit the components in reverse order. (Refer to the INSTALLATION section of thisguide or the label inside the cover for the correct alignment of spindles and controlknobs).

Relief Valve Assembly

Rubber Ball

Relief Valve Assembly

ServiceTunnel

InletConnectorAssembly

Inlet Strainer

ServiceTunnel

25

Fault Diagnosis

1. Customer Fault Diagnosis

Read the section "Important Safety Information" first and refer to the appliancediagram.

Left Knob: Power Selector Right Knob: Temperature


The trouble shooting information tabled below gives details on what you can do as a usershould you encounter difficulties whilst operating the shower.

Note! Should these remedies prove to be unsuccessful in solving your problem, contactyour installer for advice.

Malfunction Cause Remedy

No water or very lowflow rate.

Handset sprayplate blocked. Remove & clean: Refer toMaintenance in the ShowerFittings Instruction Manual.

Incoming water supply stopvalves or applianceisolating valve turned downor off.Low pressure lightilluminated.

Turn stop/isolating valve fully tofully on position.

Hose or Handset blocked Clear blockage or renew

Appliance fails toproduce hot water inany switch position.

Electrical supply isolated atdouble pole switch (thepullcord).

Switch on electrical supply viathe pullcord.

Fuse blown or MCB/RCDtripped indicating possibleelectrical fault.

Renew the fuse or reset theMCB/RCD. If fault persists,contact your installer.

Shower cycles from hotto cold.

The temperature knob ispositioned at an unsafelevel causing the appliancethermal trip to operate andcut the power to the heatertank. Overheat lightilluminates.

Turn the temperature knobsufficiently anti clock-wise toincrease water flow and reducetemperature.

26

Malfunction Cause Remedy

The temperature knob isincorrectly fitted.

Contact your installer to correct.

Handset sprayplate blocked.

Remove and clean: Refer toMaintenance in the InstructionManual for the fittings.

Other outlets being usedwhilst showering, causingwater pressure to dropbelow minimum requiredto operate appliance.Low pressure lightilluminated.

Ensure other outlets e.g. bath,washing machine or dishwasherare not in use whilst showering.

Water pressure belowminimum required forappliance operation.Low pressure lightilluminated.

Ensure incoming water supplystopcock and or applianceisolating valve turned fully on .If fault still persists contact yourinstaller.

Unable to select acool enough showerduring summer months.

Due to the rise in watermains supply temperature,the power rating may be toohigh.

Turn the left hand knob to LOWsetting and re-adjusttemperature knob until suitabletemperature is achieved.

Operation oftemperature knob haslittle or no effect onwater temperature.

Remove Handset and clean(Refer to Maintenance in theInstruction Manual for theshower fittings). If fault stillpersists contact your installer.

Handset sprayplate blocked.

Water still flows whenelectrical supply isisolated.

Shower has not been turnedoff at appliance controlknob.

The shower must be turnedoff at the appliance. Water flowisolation is manually operatednot electrical.

27

Inlet strainer blocked. Remove and clean, referto Maintenance: "InletStrainer Cleaning".

2. Installer Fault Diagnosis: refer to appliance diagram and customer fault

diagnosis

Providing the shower has been correctly installed and is operated in accordance with theinstructions contained in this guide, difficulties should not arise. If any maintenance isrequired then it must be carried out by a competent tradesperson for whom the faultdiagnosis chart and maintenance instructions are provided. Before replacing any partsensure that the underlying cause of the malfunction has been resolved.


Key - � = light illuminatedA = 'POWER' indicatorB = 'LOW PRESSURE' indicatorC = 'OVERHEAT' indicator

Malfunction A Cause RemedyCB

No water or verylow flow rate.

Handset spray plateassembly blocked.

Remove and clean, referto Maintenance in theInstruction Manual forthe shower fittings.

Incoming water supply stopvalves or appliance isolatingvalve turned down or off. Low pressure lightilluminated.

Hose or handset blocked.

Insufficient water supplypressure.

Heater tank excessivelyscaled.

Pilot valve faulty.

� �

Turn fully on.

Clear blockage or renewhose or handset.Contact local waterauthority/undertaker.

Renew the heater tank.

Renew the pilot valve.

� �

� �

� �

� �

�

�

28

Handset spray plateblocked.

Remove and clean, referto Maintenance in theInstruction Manual forthe shower fittings.

Operation oftemperature knobhas little or noeffect on watertemperature.

Flow regulator faulty. Renew the flowregulator.�

� �


Check integrity ofinternal wiring.

Poor internal wireconnections.

Shower cycles hotand cold.

The temperature is set toan unsafe level. To protectthe appliance, a fixedtemperature thermal switchis incorporated that cuts thepower to the heater tank attoo high a temperature.

�� Turn the right hand knobsufficiently anticlockwiseto increase the waterflow and preventoperation of the thermalswitch. DO NOT tamperwith the thermal switch.

Appliance fails toproduce hot waterin any switchposition.

Electrical supply isolated atdouble pole switch (thepullcord).

Switch on.

Fuse 'blown' or MCB/RCDtripped - indicating anelectrical fault e.g. heatertank element failure.

Correct the fault andrenew the fuse or resetthe MCB/RCD.Renew the heater tank.


Contact local waterauthority/undertaker.

Possible failure of thepresssure switch,microswitch or thermalswitch.

Use a suitable continuitymeasuring device tocheck the continuity ofthe pressure switch,microswitch or thermalswitch and renew partsas necessary.

��

�

�

29


No change intemperaturebetween 'LOW'and 'HIGH'setting.

Possible failure of thepresssure switch,microswitch or heater tank.

Use a suitable continuitymeasuring device tocheck the continuity ofthe pressure switch,microswitch or heatertank and renew parts asnecessary.

�

Water leakingfrom the bottom ofthe case.

The appliance is fitted witha pressure relief valveassembly that operates toreduce damage if the outletis blocked or the unit isfrozen. When the reliefvalve operates a smallrubber ball is ejected.

Reset the relief valveassembly, refer toMaintenance: "Relief

Valve Resetting".

Renew the pilot valve.

Contact local waterauthority/undertaker.Check water supplystatic pressure.Note! Static pressuremay fall below 0.5 barwhen other appliancesare operated e.g.dishwasher, washingmachine etc.

Pilot valve faulty.

Supply pressure below 0.5bar.

Water will not turnoff.


Contact local waterauthority/undertaker.

�

�

�

�

�

'POWER' neongoes off whenunit is turned on.

Check continuity andrectify supply cablefault.

Loose connections/brokenwire.

30

Spare Parts

Essentials Spare Parts List

147 50 Relief Valve Assembly417 46 Microswitch N/O - 2 pin419 82 Multi-clamp Bracket Pack419 84 Flow Regulator Assembly (7.5 kW) - D drive419 85 Flow Regulator Assembly (8.5/9.5 kW) - D drive419 86 Pilot Valve/Switching Assembly - D drive419 88 Cover Assembly - D drive431 86 Terminal Block Assembly(7.5/8.5kW)431 87 Terminal Block Assembly (9.5 kW)431 88 Seal Pack (not shown)431 89 Screw Pack (not shown)431 92 Thermal Switch Assembly431 93 Heater Tank Assembly (7.5 kW 240 V AC/ 6.85 kW 230 V AC)431 94 Heater Tank Assembly (8.5 kW 240 V AC/ 7.8 kW 230 V AC)431 95 Heater Tank Assembly (9.5 kW 240 V AC/ 8.7 kW 230 V AC)431 96 Inlet Connector Assembly431 97 Service Tunnel431 99 Neon Assembly872 28 Microswitch C/O - 3 pin

Accessories

DCV-H Outlet double check valve

DCV-H: An outlet double check valve, designed to prevent the backflow or backsiphonageof potentially contaminated water, through shower controls which are fitted with a flexiblehose as part of the outlet shower fitting. The inclusion of the Mira DCV-H will increase therequired supply pressure typically by 0.1 bar. Available as an optional accessory fromyour Caradon Plumbing Solutions stockist.

ko24567

Note

Flow Reg Assembly (7.5) - 857.24 Flow Reg Assembly (8.5/9.5) - 419.85

ko24567

Cross-Out

ko24567

Cross-Out

31

2. Essentials Spare Parts Diagram

4 mm Minimum

Important! Push-fit connectors must be assembled backto back onto terminals of microswitches. A minimum gapof 4 mm must be maintained between the connectors afterassembly.

431 96

419 82

419 86

431 76431 75

417 46872 28

431 93431 94431 95

147 50

431 92

419 88

431 97

431 87431 86

431 99

32P3498/1 (J89 J, K, L) © Caradon Mira Limited,March 2000

Essentials Showers

Caradon Mira LtdCromwell Road,Cheltenham GL52 5EP.

BS EN ISO 9001 : 1994Reg. No. FM 14648

The company reserves the right to alter productspecifications without notice.

Failing this, contact your installer to ensure that the product hasbeen installed and commissioned in full accord with our detailedinstallation instructions. Our Customer Services is available, onthe number shown below, to advise you or your installer.

If this does not resolve the difficulty, contact our CustomerServices who will give every assistance and, if appropriate,arrange for our local Service Engineer or Agent to call on amutually agreeable date.

If, through circumstances beyond our control, we are unable toprovide this cover we will, with prior agreement, authorise acompetent local installer to attend.

Within the Guarantee period there will be no charge for the partsor labour insofar as a fault with our product is concerned.However, it is important to appreciate that our Guaranteeextends to our product only and that it does not cover difficultiesarising from incorrect installation or misuse.

During a Service visit a responsible person – familiar with thepurpose of the visit – should be present. Should our ServiceEngineer or Agent be unable to gain access at the pre-arrangedtime a callout charge may be made.

Payment for Service visits, if applicable, should be madedirectly to the Service Engineer or Agent, using either Visa,Access or a cheque supported by a banker’s card.

To contact us:-

For England, Wales and Scotland

Telephone 01242 262888

and ask for Caradon Plumbing Solutions Customer

Services

• For advice on product maintenance• To order spare parts• To arrange a service visit• For product advice and problem solving• To order Instruction Guides• For your feedback on our products or servicesBy Fax: (01242) 282595 - 24 HoursBy Post: Caradon Plumbing Solutions, Cromwell Road

Cheltenham, Gloucestershire, GL52 5EP.

For Northern Ireland

By Phone: 028 9040 1909 – Monday to Friday 9am–5pmBy Fax: 028 9040 1235 – 24 HoursBy Post: Wm. H. Leech & Son Ltd., Unit 3,

34, Montgomery Road, Belfast, BT6 9HL.

For Eire

By Phone: Dublin 01 4591344 – Monday to Friday 9am–5pmBy Fax: Dublin 01 4592329 – 24 HoursBy Post: Modern Plant Ltd, Otter House, Naas Road,

Clondalkin, Dublin 22, Eire.

GuaranteeCaradon Plumbing Solutions guarantee this productagainst any defect of materials or workmanship for oneyear from the date of purchase, provided that the producthas been installed correctly and used and maintained inaccordance with the instructions supplied.

Any part found to be defective during the guarantee periodwill be replaced or repaired – at our option – without charge,provided that the product has been properly used andmaintained.

The product should not be taken apart, modified orrepaired except by a person authorised by Caradon PlumbingSolutions.

Your statutory rights are in no way affected by thisguarantee.

After Sales Service – how we can helpyouCaradon Plumbing Solutions have a team of expert staffready to provide assistance, should you experience anydifficulty with your Essentials shower.

The Caradon Plumbing Solutions Customer Services isavailable to give you advice on any problem encountered.Should the problem be unable to be resolved by advice,we will offer either a replacement part to be sent to you,or for one of our Service Engineers or Agents to call.

Spare PartsAt Caradon Plumbing Solutions we keep a stock of allfunctional parts of our products for up to ten years fromthe date of final manufacture of the product.

If during that period, our stock of a particular part isexhausted we will, as an alternative, provide an equivalentnew product or part at a price equating to the cost of repairto the old, bearing in mind the age of the product.

Caradon Plumbing Solutions will normally despatch spareparts within two working days and by 1st class post. Inthe interests of customer safety, spares that requireexposure to areas of mains voltage can only be sent toa competent person.

Payment for such parts – if applicable – can be made byVisa or Access over the phone at the time of ordering.Should payment by cheque be preferred a pro formainvoice will be sent.

Customer Care PolicyIf within a short time of installation the product does notfunction correctly, first check with the Instruction Guide tosee if the difficulty can be overcome by simple homemaintenance.

www.essentials-showers.com

SectionCustomer Service

email: [email protected]

electric shower instruction manualresources.kohler.com/plumbing/mira/pdf/p34981-mira...retaining...

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