Mira Zest 7.5 Documento técnico

Maintenance Guide

Operation &B

Installation

ELECTRIC SHOWERS

THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER

7.5 and 8.5 kW

Contents

Page

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

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

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

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

iring Diagram ................................................................... 8

Specifications ............................................................................ 8

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

Installation ................................................................. 13

Commissioning ....................................................................... 15

Operation ................................................................................. 17

Maintenance ............................................................................ 21

Fault Diagnosis ....................................................................... 26

Spare Parts .............................................................................. 28

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

Notes ................................................................................. 31

Guarantee, Customer Care Policy, and How to contact us

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

Introduction

Ifyouexperienceanydifficultywiththeinstallationoroperationofyournewshower

control,thenpleaserefertothe Maintenance and Fault diagnosis section,before

contactingCaradon Plu bing Solutions.Ourtelephoneandfaxnumberscanbe

found on the back cover of this guide.

Thank you for purchasing a quality Mira product. To enjoy the full potential of your new

product,pleasetaketimetoreadthisguidethoroughly,havingdoneso,keepithandyfor

futurereference.

TheMiraZestelectricshowershaveseparatecontrolsforpowerselectionandtemperature/

flowadjustment.Auniqueflowregulatorstabilisestemperaturechangescausedbywater

pressure fluctuations. These can result from taps being turned on or off or toilets being

flushed.

Appliances covered by this guide:

Mira Zest 7.5 -A7.5kW240VAC(6.9kW230VAC)heaterwithaMiraReactadjustable

sprayhandset.Suppliedcompletewithflexiblehose,adjustableclampbracketassembly,

slide bar and supports and hose retaining ring. Available in white finish.

Mira Zest 8.5 -A8.5kW240VAC(7.8kW230VAC)heaterwithaMiraReactadjustable

sprayhandset.Suppliedcompletewithflexiblehose,adjustableclampbracketassembly,

slide bar and supports and hose retaining ring. Available in white finish.

Section Important Safety Information

ARNING!

1.1. Productsmanufacturedbyus aresafe andwithout riskprovided theyare installed,

usedandmaintained in goodworkingorder in accordancewithour instructionsand

recommendations.

1.2. THIS APPLIANCE MUST BE EARTHED.

In accordance with the current edition of ‘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.

1.3. DO NOT twist the individual cable cores of the live and neutral conductors, as this

will prevent them from entering the terminal block.

1.4. Theshower unitmust notbe fittedwhere itmay beexposed tofreezing conditions.

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

1.5. DO NOT operate this appliance if it is frozen. Allow the appliance to thaw before

usingagain.

1.6. DO NOT operate this appliance if water leaks from the pressure relief valve,

maintenancewill berequired beforethe appliancecan besafely used.

1.7. DO NOT fit any form of outlet flow control as the outlet acts as a vent for the tank

body.Only Mira recommended outlet fittings should be used.

1.8. There are no user serviceable components beneath the cover of the appliance.

Only a competent tradesperson should remove the cover.

1.9. 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.

1.9.1. If the cover is not correctly fitted and water has entered the appliance

case.

1.9.2. If the case is damaged.

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

1.9.4. If the appliance shows signs of a distinct change in performance, indicating

aneed for maintenance.

1.9.5. If the appliance is frozen.

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

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

1.12. Refer to the wiring diagram before making anyelectrical connections.

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

Caution!

2.1. Read all of these instructions and retain this guide for later use.

2.2. Pass on this guide in the event of change of ownership of the installation site.

2.3. Follow all warnings, cautions and instructions contained in this guide, and on or

insidethe appliance.

2.4. The electrical installation must comply with the “Requirements for Electrical

Installations”commonly referredtoas theIEEWiringRegulations,oranyparticular

regulationsand practices, specifiedby thelocal electricity supplycompany inforce

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:

2.4.1. NationalInspectionCouncilforElectricalInstallationandContracting(NICEIC),

throughouttheUK.

2.4.2. TheElectricalContractorsAssociation (ECA),England andWales.

2.4.3. The Electrical Contractors Association of Scotland (ECAS).

2.5. 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.

2.6. The plumbing installation must comply with the requirements of UK Water

Regulations/Bye-laws(Scotland),BuildingRegulationsoranyparticularregulations

and practices, specified by the local water company or water undertakers. The

installationshould becarried out by a plumberor contractorwho isregistered, oris

a member of, an association such as:

2.6.1. Institute of Plumbing (IOP), throughout the UK.

2.6.2. National Association of Plumbing, Heating and Mechanical Services

Contractors(NAPH & MSC), England andWales.

2.6.3. Scottish and Northern Ireland Plumbing Employers’Federation (SNIPEF),

ScotlandandNorthernIreland.

2.7. 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

operationof thecontrols.

2.8. Whenthisappliancehasreachedtheendofitsserviceablelife,itshouldbedisposed

of in a safe manner, in accordance with current local authority recycling, or waste

disposal policy.

Tick the appropriate boxes to familiarize yourself with the part names and to confirm that the

parts are included.

2. Documentation

1 x Installation, Operation and Maintenance Guide 

1 x Customer Support Brochure 



Section Pack Contents Checklist

1. Mira Zest 7.5 or 8.5 kW

3 x Wall Plugs 

3 x Fixing Screws 

1 x Mira Zest 7.5 or 8.5

Section Dimensions

202 mm

297 mm

81 mm

Specifications

Plumbing

1. Minimummaintained inletpressure 0.7bar forsatisfactory operation.

2. Maximum static inlet pressure 10 bar.

3. Minimum static pressure 0.2 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 Mira Zest complies with all the relevant directives for CE marking.

Wiring Diagram

Thermal Cutout

Dual Disc

Tank Connection

Load

Pressure/ON/OFF/Power

/Selector Switch

97 Brown

96 Red

88 Red 86 Brown

91 Green

90 Blue

89 Brown

Installation Re uirements

Plumbing

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

of 0.7 bar up to a axi u static inlet pressure of 10 bar.

2. The appliance is normally connected to the cold water mains-fed supply.However,

thewatersupply canbetaken fromacold waterstoragecistern, providedthereis a

minimummaintainedinlet headof waterof 7 metres (the vertical distancefrom the

base of the cold water storage cistern to the shower fitting handset). To reduce

pressurelossesandfluctuations, the cistern-fedwatersupply must beindependent

from other supply draw-offs, and should avoid long horizontal pipe runs and use

sweptbends rather than90° elbows.

3. The appliance is suitable for installation within the shower area. It is fitted with a

pressurereliefdevice and mustbepositioned overawater catchment areawiththe

controls at a convenient height for the user.

4. Theappliance is fittedwith a plasticinlet connectorintendedto connectto a 15mm

compression fitting supplied from the top, bottom or back.

5. 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.This is important as difficulty may

beencounteredwhenfittingthecoverandsubsequentoperationoftheunitcouldbe

impaired (small pillars moulded on to the back of the case allow air circulation).

6. Refrainfromapplyingexcessiveforcewhenmakinganyconnections.Alwaysprovide

mechanicalsupportwhenmaking the plumbing connections.

7. Do not install the appliance in a position where it ay beco e frozen. The

shower unit must not be fitted where it may be exposed to freezing conditions.The

shower unit must not be used if suspected of being frozen.

8. We recommend that a non-restrictive (free flowing) isolating valve is fitted in the

coldwater supply pipeto allow thecomplete maintenanceof the appliance. Do not

useavalvewith aloosewasherplate (jumper)asthiscan leadtoabuild up ofstatic

pressure.

9. Toavoiddamagetothecasewhensolderedfittingsareused,pre-solderthepipework

and fittings before connecting them to the inlet stub.

10. The appliance is fitted with a ½ " BSP male outlet thread, to accept a Mira shower

hose.

11. SupplypipeworkMUST be flushedto clear debrisbeforeconnecting the appliance.

12. Wheninstalledinvery hardwaterareas(above 200 ppmtemporaryhardness) your

installer may advise the installation of a water treatment device, to reduce the

effects of limescale formation. Appliance malfunction due to excessive limescale

formationisnotcoveredbythemanufacturer’s guarantee.Yourlocalwatercompany

will be able to advise the hardness of water in your area.

13. A hose retaining ring is supplied to prevent the handset from dropping below the

spillover level of the bath or shower, which could lead to contamination from back-

siphonage(referto Figure 1).Thesuppliedhoseretainingringshouldmeetthegreat

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, e.g. the Mira

DCV-H, ust be fitted.The inclusion of the Mira DCV-H will increase the required

supply pressure typically by 0.1 bar.

Double checkvalves, fitted in the inlet supply to the appliance, cause a pressure

build-up, which could exceed the maximum static inlet pressure for the appliance.

14. Waterflowcanbeobtainedwithout theelectricalpowerbeingconnected.Thisallows

the plumbing connections to be tested prior to final connection of the electrical

supply.

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

life of the hose.

Hose Retaining

Ring

25mmMinimum

Spill-over

Level

Figure 1

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